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South Russian
Journal of Cancer..
Vol. 5
No. 3, 2024
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South Russian
Journal of Cancer..
Vol. 5
No. 3, 2024
South Russian Journal of Cancer. 2024. Vol. 5, No. 3. P. 50-63
https://doi.org/10.37748/2686-9039-2024-5-3-5
https://elibrary.ru/koukit
ORIGINAL ARTICLE
Cellular, genomic and transcriptomic effects of secondary metabolites..
of the Hybrid Butterbur on the HeLa cell line..
E. Yu. Zlatnik1, Ya. S. Enin1 , O. N. Burov2, E. S. Bondarenko1, A. B. Sagakyants1, D. S. Kutilin1,
Yu. V. Dzigunova2, I. A. Novikova1, Yu. V. Przhedetskiy1
1 National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation
2 Southern Federal University, Rostov-on-Don, Russian Federation
Dendro51@yandex.ru
ABSTRACT
Purpose of the study. To evaluate the cellular, genomic (gene copy number) and transcriptomic (gene expression) effects of
P.hybridus (L.) secondary metabolites when they affect the HeLa cell line.
Materials and methods. The isolation
of secondary metabolites
from plant
material
and its
identification
were carried out
by
preparative chromatography. The composition was determined using mass spectrometric analysis, and the final verification
of structural formulas was carried out by nuclear magnetic resonance at the Department of Natural Compounds, the Faculty
of Chemistry of the Southern Federal University. The subsequent phase of the study was conducted using both cultural and
molecular methods. HeLa cells
were cultivated under standard conditions in a MEM medium. Once the confluence level was
reached 75�80
%, the nutrient medium was replaced with the introduction of the studied compounds (at a concentration of 4
micrograms/ml) and cultivated for 72 hours. Cell mortality was determined using a NanoEnTek JuliFl counter (Korea) in the
presence of 0.4 % trypan blue. The assessment of apoptosis following secondary metabolite exposure was conducted on
a BD
FACSCanto II flow cytometer using the
FITC
Annexin
V Apoptosis
Detection
Kit
I.
The
level
of replication
and expression
of the genes responsible for apoptosis was assessed by digital droplet PCR (ddPCR).
Results. The following compounds were isolated and verified, and were assigned the following sequence numbers to facilitate
their use in the experiment: No. 2 � 2,4-dihydroxy-2,5-dimethylfuran-3(2H)-one, No. 3 � 5-(hydroxymethyl) furan-2-carbaldehyde,
No. 5.3 � 2,2,8-trimethyldecahydroazulene-5,6-dicarbaldehyde, P. hybridus (L.) At the stage of cell death assessment, it was
found that
the greatest
effect
was
achieved in the compound under ordinal
No. 2. However, the evaluation of the copy number
and expression of the CASP8, CASP9, CASP3, BAX, BCL2, TP53, MDM2, CDKN1B, CDK1, CCND1, CCND3, and RB1 genes by
DD-PCR revealed the presence of apoptosis initiation in tumor cells at the molecular level under the action of compounds No.
2 and No. 5.3 obtained from P. hybridus (L.).
Conclusion. The outcomes were multifeatured. Only compound 2,4-dihydroxy-2,5-dimethylfuran-3(2H)-one exhibited a pronounced
cytostatic effect out of all compounds utilized in the experiment. Concurrently, the compound 2,2,8-trimethyldecahydroazulene-
5,6-dicarbaldehyde was found to induce an increase in the expression of the CASP3, CASP8, TP53, and BAX genes.
Keywords:
secondary plant metabolites, apoptosis, gene expression, copy number variation, HeLa cell line, digital droplet PCR
For citation: Zlatnik E. Yu., Enin Ya. S., Burov O. N., Bondarenko E. S., Sagakyants A. B., Kutilin D. S., Dzigunova Yu. V., Novikova I. A., Przhedetskiy Yu. V.
Cellular, genomic and transcriptomic effects of secondary metabolites of the Hybrid Butterbur on the HeLa cell line. South Russian Journal of Cancer. 2024;
5(3): 50-63. https://doi.org/10.37748/2686-9039-2024-5-3-5, https://elibrary.ru/koukit
For correspondence: Yaroslav S. Enin � Junior Researcher, Laboratory of Molecular Oncology, National Medical Research Centre for Oncology, Rostov-on-Don,
Russian Federation
Address: 63 14 line str., Rostov-on-Don 344037, Russian Federation
E-mail: Dendro51@yandex.ru
ORCID: https://orcid.org/0000-0002-4572-1579
SPIN: 7683-2286, AuthorID: 840050
Scopus Author ID: 57196464479
Funding: this work was not funded. The work was performed with scientific equipment provided by the Central Research Institute of the National Medical
Research Center for Oncology: https://ckp-rf.ru/catalog/ckp/3554742/
Conflict of interest: the authors declare that there are no obvious and potential conflicts of interest associated with the publication of this article
The article was submitted 19.06.2024; approved after reviewing 07.08.2024; accepted for publication 25.08.2024
� Zlatnik E. Yu., Enin Ya. S., Burov O. N., Bondarenko E. S., Sagakyants A. B., Kutilin D. S., Dzigunova Yu. V., Novikova I. A., Przhedetskiy Yu. V., 2024
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ORCID: https://orcid.org/0000-0002-4572-1579
SPIN: 7683-2286, AuthorID: 840050
Scopus Author ID: 57196464479
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South Russian Journal of Cancer 2024. Vol. 5, No. 3. P. 50-63
Zlatnik E. Yu., Enin Ya. S. , Burov O. N., Bondarenko E. S., Sagakyants A. B., Kutilin D. S., Dzigunova Yu. V., Novikova I. A., Przhedetskiy Yu. V. Cellular, genomic and
transcriptomic effects of secondary metabolites of the Hybrid Butterbur on the HeLa cell line
INTRODUCTION
Cervical cancer is one of the main causes of female
mortality. Every year, more than 528,000 new
cases of breast cancer and more than 266,000
deaths
from this
disease
are
detected
[1, 2]. The
HeLa cell line is a very convenient and simple object
for conducting model experiments in vitro. This cell
line was obtained on February 8, 1951 from a cervical
tumor
of a patient named Henrietta Lacks at the
Baltimore
hospital
[3]. In
our study, we
used this
cell
line to evaluate the cytotoxic effect of the organic
compounds of plant origin that we obtained.
Plants
synthesize a huge number of secondary
metabolites, and in fact it is these metabolites that
form the basis of many commercial pharmaceuticals,
as well as herbal medicines. Many secondary
metabolites, such as alkaloids, terpenoids and phenylpropanoids,
are being considered for drug development
[4].
Secondary metabolites of plants are structurally
diverse compounds that do not directly participate in
the growth, development and reproduction of plants,
but
more often perform a protective function. These
compounds with different chemical structures can
act as potential multi-purpose anticancer
agents [5].
For the first time in history, the term secondary metabolite
was proposed by the German biologist Albrecht
Kessel in 1891. when he gave a lecture "On the
chemical composition of cells" for the Berlin Society
of Physiologists, in which he said: "I propose to call
compounds that are important for each cell primary,
and compounds that are not present in any plant cell
secondary" [6]. Currently, the secondary metabolites
of plants are divided into several large groups. Terpenoids
(isoprenoids) cover more than 40,000 structures
and form the largest class of all known plant
metabolites. They represent
a class of hydrocarbons,
i. e. products
of biosynthesis
of the general formula
(C5H8) n, with a carbon skeleton that is a derivative
of isoprene CH2=C(CH3)�CH=CH2. Alkaloids are
characterized as heterocyclic compounds containing
a nitrogen molecule in a heterocycle and count
about 21,000 compounds. Phenolic compounds are
aromatic compounds
with
a
benzene
ring containing
at least one hydroxyl group [7].
The species selected in our work for the isolation
of secondary metabolites is the hybrid Petasites hibridus
(L.) Gaertn., B.
Mey. & Scherb is a herbaceous
perennial plant of the Asteraceae family, found in the
European territory of Russia, and, in particular, in the
Krasnodar Territory and the Republic of Adygea. The
reasons for the interest in this species are that various
representatives of the genus Petasites, including
P. hibridus (L.)
itself, contain compounds
with
cytotoxic effects on tumor cells of various nosolo
gies
[8]. So in
the
Japanese
White-collar Petasites
japonicus (Siebold & Zucc.) Maxim. sesquiterpene
I and sesquiterpene II were detected, which showed
cytotoxic effect against both human astrocytoma
U-251MG tumor cells, as well as against the MDA
MB-231 breast cancer cell line [9].
Various methodological approaches are used to
study the effect of secondary plant metabolites on
tumor
cells,
including cytometry
and flow
cytofluorometry,
model experiments on cell cultures and
molecular genetic studies. The latter include the
assessment of the level of replication and gene
expression. CNV (copy number
variation) is a type
of genetic polymorphism that leads to a change in
the number of certain genetic loci and, as a result,
a change in the expression of these genes
and their
products � proteins and non-coding RNAs [10].
Studies
of the effect of secondary plant metabolites on
the expression and replication of genetic loci regulating
apoptosis and the cell cycle in cervical cancer
are currently few, so this aspect requires additional
study. This is what this work is dedicated to.
The study purpose was to evaluate the cellular,
genomic (gene replication) and transcriptomic (gene
expression) effects of secondary metabolites of
P. hibridus (L.) when they are exposed to the HeLa
cell line.
MATERIALS AND METHODS
Extraction of metabolites. The primary plant material
was collected and determined with the participation
of the staff of the Department of Botany of
the Academy of Biology and Biotechnology of the
D. I. Ivanovsky Southern Federal University. Isolation
and verification of secondary metabolites of
P. hibridus (L.) were carried out by employees of
the
Department of Natural and High Molecular Weight
Compounds of the Faculty of Chemistry of the Southern
Federal University. Tetrachloroethylene was used
as
a solvent
for primary extraction, which
was
poured
into mechanically purified and crushed rhizomes.
����-���������� �������������� ������ 2024. �. 5, � 3. �. 50-63
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The primary extraction process lasted for four
months. To extract tetrachloroethylene from vegetable
raw materials, the decantation method was
used, followed by concentration of the solution by
distillation of the solvent in a distillation unit. Tetrachloroethylene
was
used
as
a
solvent
to reduce
the amount of polar compounds (mono- and disaccharides,
amino sugars, etc.). The next step was the
separation of the resulting concentrated solution using
column chromatography using silica gel as
a sorbent
on column 20*2. Various
eluents were used:
first, tetrachloroethylene, which allowed to obtain
10 fractions of various colors, from colorless to light
yellow. Then methylene chloride was used, which
gave 10 more fractions. After that, the eluent was
changed,
and the column was filled with a mixture
of methylene
chloride
and alcohol
in
a ratio of 10/1,
which led to the production of two more fractions.
All fractions were concentrated by evaporation on
a rotary evaporator.
The method of high-performance liquid chromatography
with mass detection was used to identify
the isolated compounds. The mass spectra were
analyzed using NIST 2011 biotechnology, which confirms
the results of studies with alkaloids and other
biologically active compounds.
Fractions containing higher fatty acids, nitrogenous
bases of nucleic acids and their glycosides
were excluded from further work. In addition, the
previously isolated fractions
were further purified
using column
chromatography, and
the
purified
compounds
were identified using nuclear magnetic resonance
(1H NMR). The identification of purified frac
tions using NMR made it possible to determine the
purity and confirm the structure of compounds previously
assumed using mass detector chromatogra
phy. The following main names have been identified
for experimental
use: No. 2
� 2,4-dihydroxy-2,5-dimethylfuran-
3(2H)-oh, No. 3
� 5-(hydroxymethyl)furan-
2-carbaldehyde, No. 5.3
� 2,2,8-trimethyldecahydroazulene-
5,6-dicarbaldehyde (Fig. 1).
Assessment of biological effects
The biological effect of the isolated compounds
was evaluated on the HeLa CCL2 cell line. The cell
line was obtained from the biobank of the National
Medical Research Centre for Oncology, which
works in accordance with the recommendations on
the organization of the structure of biorepositories
and the ethical requirements of the latest edition
of the ISBER Best Practices and based on the ISO
9001 standard [11]. The cells were cultured at 37 �C
and 5 %CO2 in a nutrient medium
Igla MEM (BioloT)
containing 10 % fetal serum from cows (HyClone,
USA), up to a
number of 1
. 106 cells. When 80 %
confluence was achieved, the nutrient medium was
replaced with a similar
one with the addition of 4
micrograms / ml of furfural and azulene derivatives
to the test samples, and without the addition of the
studied substances in the negative control. The
exposure time was 72 hours. After that, the cells
were removed from culture vials with 0.1 % trypsin
solution. The number of living and dead cells was
determined using an automatic NanoEnTek JuliFl
counter (Korea) with 0.4 % trypan blue staining. Cells
removed from culture vials were preserved in an RNA
2,4-dihydroxy-2,5-dimethylfuran-
-3(2H)-one (2)
Chemical Formula: C6H804
Molecular Weight: 144,13
5-(hydroxymethyl)furan- -2-carbaldehyde
(3)
Chemical Formula: C6H603
Molecular Weight: 126,11
2,2,8-trimethy|decahydroazulene-5,6-
dicarbaldehyde (5.3)
Chemical Formula: C15 02
H24
Molecular Weight: 236,3499
Fig. 1. Structural formulas of three compounds isolated from the hybrid P. hibridus (L.) protein
South Russian Journal of Cancer 2024. Vol. 5, No. 3. P. 50-63
Zlatnik E. Yu., Enin Ya. S. , Burov O. N., Bondarenko E. S., Sagakyants A. B., Kutilin D. S., Dzigunova Yu. V., Novikova I. A., Przhedetskiy Yu. V. Cellular, genomic and
transcriptomic effects of secondary metabolites of the Hybrid Butterbur on the HeLa cell line
medium (IntactRNA Eurogene). Cellular apoptosis
was
assessed
on
a
BD
FACSCanto II
flow cytofluorometer
using the
FITC
Annexin
V Apoptosis
Detection
Kit I. Cells stored in an RNA medium were divided
into two equal aliquots, from which total DNA/RNA
preparations were extracted using the commercial
DNA-sorb-B and Trizol kit, respectively.
Molecular methods
The evaluation of copy number variations and
gene expression was performed by digital drip PCR
using the QX200� ddPCR� EvaGreen Supermix
kit (Bio-Rad, USA). The Droplet Digital polymerase
chain reaction system (ddPCR�) was developed
for high-precision absolute quantitative analysis of
target sequences of nucleic acids encapsulated in
discrete droplets of water-oil emulsion determined by
volumetric method. Using a droplet generator, each
sample of the studied locus was divided into 20,000
droplets in three repeats. Amplification was carried
out to the end point (40 cycles) on the C1000 Touch
Thermal Cycler Bio-Rad.
After the amplification was completed, a QX200
Bio-Rad reader was placed on the sample plate,
which counted droplets giving fluorescent positive
and negative signals to calculate the concentration
of target DNA and ctDNA. The principle of measuring
the level of copyness and expression indicators
using digital drip PCR technology was to directly
count events via the FAM channel. In positive droplets
containing at least one copy of the target DNA,
the droplet reader
shows fluorescence,
unlike negative
droplets in which amplification did not occur.
QuantaSoft v1 software.7.4 measures the number
Fig. 2. Screenshot of the QuantaSoft v1 software.7.4 during the
result processing
of positive and negative droplets in each sample,
and then applies an algorithm for calculating the
Poisson distribution function to determine the initial
concentration of target DNA molecules in units of
"copies/.l" (Fig. 2).
The level of CNV and gene expression was calculated
as follows. According to the formula, the
concentration of each studied locus / concentration
of the reference locus . the number of copies of the
reference loci in the genome (as a rule 2).
Statistical data processing
Statistical data processing was carried out using
the Statistica 19.0 program (StatSoft Inc., USA). To
assess the significance of the differences, a singlefactor
analysis of variance was used (the critical
level of statistical significance was p < 0.05).
STUDY RESULTS
At
the first
stage of the study, the purification
and verification of compounds that can exhibit cytotoxic
effects on tumor cells of various nosologies
was carried out. The identification of the isolated
compounds was performed by mass spectometry
and nuclear
magnetic
resonance (NMR);
during it,
2,4-dihydroxy-2,5-dimethylfuran-3(2H)-one was verified,
which was assigned the serial number 2,5-(hydroxymethyl)
furan-2-carbaldehyde with the serial
number 3, as well as 2,2,8-trimethyldecahydroazulene-
5,6-dicarbaldehyde with the serial number 5.3.
All three compounds are isolated from the rhizomes
of P. hibridus (L.). The data obtained by evaluating
the cytotoxic effect of the compounds involved in the
experiment on the NanoEnTek JuliFl cell counter are
presented in Table 1.
As can be seen from the data presented in Table
1, all compounds according to the results of the
trepan blue test had an approximately equivalent
effect
on
HeLa tumor cells; in
experimental
samples,
the number of dead cells exceeded the control by
1.97�2.44 times. The images below, obtained using
an inverted microscope (Leica DM IL LED), show
a comparison of a control sample of the HeLa cell
line
with
a
sample
treated
with
compound
No. 2.
After exposure, a
violation
of the
monolayer in
the
experimental sample is seen associated with weaker
cell attachment or lysis, and a large number of cells
are "scalded" (Fig. 3).
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The following images show the effect achieved
when exposed to compound No. 3 in comparison
with the control,
a dense monolayer
of cells is observed,
at
the
same
time
a large
number of scalding
cells (Fig. 4).
Figure 5 shows a comparison of the control of
Hela cells with cells that were exposed to compound
5.3, in the experimental sample there is a dense
monolayer of cells and an increase in the number
of scalding cells that exceeds that observed in the
control.
The results of the evaluation of the antitumor effect
of the metabolites used by us are also
confirmed
by the data of flow
cytofluorometry presented below.
The most pronounced cytotoxic effect was shown
by (2,4-dihydroxy-2,5-dimethylfuran-3(2H)-one) at
No. 2
at a concentration of 4
micrograms /ml at
exposure for 72 hours. The remaining compounds
used did not have such an effect according to flow
cytofluorometry (Fig. 6�8, table 2).
As can be seen from Figure 6, 72-hour incubation
with (2,4-dihydroxy-2,5-dimethylfuran-3(2H)-one)
had a cytostatic effect on HeLa cells, expressed in
an increase in the number of cells in the state of
early apoptosis from 7.2 to 13.3 %, and late apoptosis
from 5.8 to 8.3 %. The total number of cells
in the state of apoptosis after exposure (2,4-dihydroxy-
2,5-dimethylfuran-3(2H)-one) increases 1.6
times.
Based on
the
data in
Fig.7, it
follows
that
a 72-hour
incubation with 5-(hydroxymethyl)furan-2-carbalde
hyde did not have a cytotoxic effect on HeLa cells,
the difference with the control in early apoptosis
changed from 7.2 to 7.3 %, and late apoptosis � from
5.8 to 6.2 %. The total number of cells in the state
of apoptosis after exposure to 5-(hydroxymethyl)
furan-2-carbaldehyde increases by 0.5 times.
Figure 8 demonstrates that 72-hour incubation
with 5-(hydroxymethyl)furan-2-carbaldehyde also did
not have a cytotoxic effect on HeLa cells, the difference
with the control in early apoptosis changed
from 7.2 to 7.5 %, and late apoptosis � from 5.8 to
6.8 %. The total number of culture cells in the state
of apoptosis after exposure to 2,2,8-trimethyldecahydroazulene-
5,6-dicarbaldehyde increased 1.3 times.
Digital drip PCR was used to evaluate changes
in CNV and expression (CNV/EXP) indices under
the
influence of secondary metabolites
from
P. hibridus (L.) isolated by us. When exposed to
2,2,8-trimethyldecahydroazulene-5,6-dicarbaldehyde
at a concentration of 4 micrograms/ml exposure
for 72 hours, there were increases in the level of
expression of CASP3 in relation to the control by
28.28times (p < 0.05), and
CASP8 by 46.71 times
(p < 0.05). At the same time, the expression of the
CASP9 locus increased by 3.43 times (p
<
0.05). Exposure
to 5-(hydroxymethyl) furan-2-carbaldehyde at
a concentration of 4 micrograms/l and an exposure
of 72
hours
had
the
following effect: the
expression
level of CASP3 increased by 4.57 times relative to
the control (p < 0.05), it also increased the expression
level of CASP8 by 10.48 times (p < 0.05). When
using 2,4-dihydroxy-2,5-dimethylfuran-3(2H)-one at
a concentration of 4
micrograms/ml
exposure for 72
hours, the expression of the CASP3 locus relative to
the control increased by 3.95 times (p < 0.05), and
CASP8 by 3.38 times (p < 0.05). At
the
same time,
the indicators of the copy level (CNV) of the CASP8,
CASP9, and CASP3 loci did not undergo major changes
(Fig. 9).
At the same time, the assessment of changes in
the levels of copy number variability (CNV) and expression
(EXP) at the TP53 and MDM2 loci showed
the following results. The compound 2,2,8-trimeth-
Table 1. The number of
living and
dead
HeLa cells after exposure to
isolated
secondary metabolites after staining with trypan blue
Compounds, concentrations 72 hours, living cells 72 hours, dead cells
Control 93.52 % 6.48 %
� 2, 4 .g /ml
87.23 % 12.77 %
� 3, 4 .g /ml
86.66 % 13.34 %
� 5.3, 4 .g /ml
84.16 % 15.84 %
South Russian Journal of Cancer 2024. Vol. 5, No. 3. P. 50-63
Zlatnik E. Yu., Enin Ya. S. , Burov O. N., Bondarenko E. S., Sagakyants A. B., Kutilin D. S., Dzigunova Yu. V., Novikova I. A., Przhedetskiy Yu. V. Cellular, genomic and
transcriptomic effects of secondary metabolites of the Hybrid Butterbur on the HeLa cell line
�B
Fig. 3. HeLa cells after exposure to 2,4-dihydroxy-2,5-dimethylfuran-3(2H)-one. A � control specimen; B � experimental specimen
�B
Fig. 4. HeLa cells after exposure to terpenoid 5-(hydroxymethyl)furan-2-carbaldehyde. A � control specimen; B � experimental specimen
�B
Fig. 5. HeLa cells
after incubation
with the terpenoid 2,2,8-trimethyldecahydroazulene-5,6-dicarbaldehyde. A � control
specimen;
B � experimental specimen
����-���������� �������������� ������ 2024. �. 5, � 3. �. 50-63
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�������� � ��������������� ������� ��������� ����������� ������������� ���������� �� ��������� ����� HeLa
yldecahydroazulene-5,6-dicarbaldehyde at an exposure
of 72
hours
and a concentration of 4
micrograms/
ml increased the TP53 copy level by 1.05
times (p < 0.05), and MDM2 decreased by 0.26
times (p < 0.05)
relative to the control. The difference
between them was 4 times. In addition, 2,4-dihydroxy-
2,5-dimethylfuran-3(2H)-one increased TP53
expression level by 1.46 times (p < 0.05)
at
exposure
of 72 hours and concentration of 4 micrograms/ml,
30_05_19-Kontr
105
104
while MDM2 decreased by 0.88 times (p < 0.05). The
difference was 1.66 times (Fig. 10).
The following data were obtained when evaluating
changes in the level of replication and expression of
the BAX and BCL2 loci. The terpenoid 2,2,8-trimethyldecahydroazulene-
5,6-dicarbaldehyde increased
the level of CNV of the I locus by 0.9 times relative to
the control (p < 0.05), the
level
of BCL2 decreased by
0.13times (p < 0.05). The difference between them
30_05_19-2_4 mkg
105
104
PIPE-A
-7,508
Q1-1 Q2-1
Q3-1 Q4-1
PIPE-A
-2.190 -103 0 103 104 105
Ann V FITC-A
-7,399
Q1-1 Q2-1
Q3-1 Q4-1
-2.223 -103 0 103 104 105
Ann V FITC-A
103
103
0
0
-103
-103
�
B
Fig. 6. Effect of (2,4-dihydroxy-2,5-dimethylfuran-3(2H)-one) on necrosis/apoptosis of the HeLa cell line: A � control specimen;
B � experimental specimen, (Q3-1 � living cells, Q4-1 � early apoptosis, Q2-1 � late apoptosis/necrosis, Q1-1 � dead cells)
30_05_19-Kontr 30 05_19-5 3 4 mkg
105
105
104
104
PIPE-A
-7,508
Q1-1 Q2-1
Q3-1 Q4-1
PIPE-A
-2.190 -103 0 103 104 105
Ann V FITC-A
-7,326
Q1-1 Q2-1
Q3-1 Q4-1
-657 0 103 104 105
Ann V FITC-A
103
103
0
0
-103
-103
�
B
Fig. 7. Exposure to 5-(hydroxymethyl)furan-2-carbaldehyde on necrosis/apoptosis of the HeLa cell line: A � control specimen;
B � experimental specimen, (Q3-1 � living cells, Q4-1 � early apoptosis, Q2-1 � late apoptosis/necrosis, Q1-1 � dead cells)
South Russian Journal of Cancer 2024. Vol. 5, No. 3. P. 50-63
Zlatnik E. Yu., Enin Ya. S. , Burov O. N., Bondarenko E. S., Sagakyants A. B., Kutilin D. S., Dzigunova Yu. V., Novikova I. A., Przhedetskiy Yu. V. Cellular, genomic and
transcriptomic effects of secondary metabolites of the Hybrid Butterbur on the HeLa cell line
was 6.92 times. Also, when exposed to the same
compound, the expression level of BAX increased by
1.73 times (p < 0.05), and BCL2 decreased by 1.19
times (p < 0.05). The difference between them was
1.45 times in favor of an increase in BAX (Fig. 11).
The furan and azulene derivatives of P. hibridus
(L.) metabolites used in our study changed
the level of replication and expression of CDKN1B,
CDK1, CCND1, CCND3 and RB1 loci as follows. Thus,
2,2,8-trimethyldecahydroazulene-5,6-dicarbaldehyde
increased CCND3 expression by 20.66 times relative
to the control (p < 0.05), RB1 expression increased by
7.35 times (p < 0.05) at an exposure of 72
hours and
a concentration
of 4
micrograms/ml. In turn
5-(hydroxymethyl)
furan-2-carbaldehyde with an exposure
of 72
hours
and a concentration of 4
micrograms/ml
also increased the expression level of CCND3 by
5.23 times (p
<
0.05).
At the same time,
2,4-dihy30_
05_19-Kontr
105
104
droxy-2,5-dimethylfuran-3(2H)-one at similar concentrations
and exposures increased the CCND3 copy
level by 3.48 times (p < 0.05), and
the
expression
level
increased by 2.42 times relative to the control (p <
0.05). At the same time, 2,4-dihydroxy-2,5-dimethylfuran-
3(2H)-one at the point of 4 micrograms/ml with
an exposure of 72 hours increased the expression
level of the RB1 locus relative to the control by 4.51
times (p < 0.05) (Fig. 12).
DISCUSSION
Since the early 2000s, many works have been published
worldwide on the search for new compounds
of natural origin, including plant origin ones, with cytostatic
or cytotoxic effects on tumor cells of various
diseases
[12]. In
our study, we
conducted not
only
a model experiment to assess the level of cytotoxic
30 05_19-5 3 4 mkg
105
104
PIPE-A
-7,508
Q1-1 Q2-1
Q3-1 Q4-1
PIPE-A
-2.190 -103 0 103 104 105
Ann V FITC-A
-7,326
Q1-1 Q2-1
Q3-1 Q4-1
-657 0 103 104 105
Ann V FITC-A
103
103
0
0
-103
-103
�
B
Fig. 8. The effect of 2,2,8-trimethyldecahydroazulene-5,6-dicarbaldehyde on necrosis/apoptosis of the HeLa cell line: A � control specimen;
B � experimental specimen, (Q3-1 � living cells, Q4-1 � early apoptosis, Q2-1 � late apoptosis/necrosis, Q1-1 � dead cells)
Table 2. The number of HeLa cells in a state of apoptosis after exposure to isolated secondary metabolites
(72 hours exposure)
Compound Concentration,
.g /ml
Alive cells
Q3-1
Early-stage
apoptosis
Q4-1
Late-stage
apoptosis / necrosis
Q2-1
Dead cells
Q1-1
Control 87.0 % 7.2 % 5.8 % 0 %
No. 2 4 78.3 % 13.3 % 8.3 % 0 %
No. 3 4 91.1 % 2.5 % 6.3 % 0 %
No. 5.3 4 94.2 % 2.6 % 3.2 % 0 %
����-���������� �������������� ������ 2024. �. 5, � 3. �. 50-63
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�������� � ��������������� ������� ��������� ����������� ������������� ���������� �� ��������� ����� HeLa
effect of the P. hibridus (L.) secon dary metabolites
that we obtained, but also used the digital drip PCR
method to register molecular genetic changes in
loci responsible for suppressing tumor growth and
apoptosis in HeLa tumor cells.
The data obtained in the study show mixed
results. The most pronounced change in the expression
level of the CASP8 and CASP3 loci was
revealed when exposed to 2,2,8-trimethyldecahydroazulene-
5,6-dicarbaldehyde. Cytosolic caspases
are cysteine-asparagine proteases, which are the
main family of proteins involved in the transmission
of cell death signals. Caspases are divided into three
groups:
initiatory,
inflammatory and effector.
They
are directly involved in the initiation of apoptosis.
As is known, the CASP8 protein, which is an initia
50
46,713,4328,2845
40
35
30
25
20
15
10,480,834,5710
5
3,380,693,950,890,941,550,930,980,810,02 0,750,180
Compound No. 2,
4 .g/ml,
72 hours EXPCompound No. 2,
4 .g/ml,
72 hours CNVCompound No. 3,4 .g/ml,
72 hours EXPCompound No. 3,4 .g/ml,
72 hours CNVCompound No. 5.3,4 .g/ml,
72 hours EXPCompound No. 5.3,
4 .g/ml,
72 hours CNV
CASP8 CASP9 CASP3
Fig. 9. Changes in the level of replication and expression of the CASP8, CASP9, and CASP3 loci under the action of 2,4-dihydroxy-2,5-dimeth-
ylfuran-3(2H)-one (No. 2), 5-(hydroxymethyl)furan-2-carbaldehyde (No. 3) and 2,2,8-trimethyldecahydroazulene-5,6-dicarbaldehyde (No. 5.3)
1,6
1,460,881,4
1,201,381,2
1,040,771,031,141,191,081,050,261,0
0,8
0,6
0,4
0,2
0
Compound No. 2, Compound No. 2, Compound No. 3,Compound No. 3,Compound No. 5.3,Compound No. 5.3,
4 .g/ml,
4 .g/ml,
4 .g/ml,
4 .g/ml,
4 .g/ml,
4 .g/ml,
72 hours EXP
72 hours CNV
72 hours EXP
72 hours CNV
72 hours EXP
72 hours CNV
TP53 MDM2
Fig. 10. Changes in the level of replication and expression of TP53, MDM2 loci when exposed to 2,4-dihydroxy-2,5-dimethylfuran-3(2H)-one
(No. 2), 5-(hydroxymethyl) furan-2-carbaldehyde (No. 3) and 2,2,8-trimethyldecahydroazulene-5,6-dicarbaldehyde (No. 5.3)
South Russian Journal of Cancer 2024. Vol. 5, No. 3. P. 50-63
Zlatnik E. Yu., Enin Ya. S. , Burov O. N., Bondarenko E. S., Sagakyants A. B., Kutilin D. S., Dzigunova Yu. V., Novikova I. A., Przhedetskiy Yu. V. Cellular, genomic and
transcriptomic effects of secondary metabolites of the Hybrid Butterbur on the HeLa cell line
tor, is associated with tumor necrosis factor (TNF)
located on the cell surface, as well as the FAS ligand
(FasL), and induces apoptosis (CD95). Activation of
the CASP8 protein via the external apoptosis pathway
triggers BID-mediated activation of BAX and
BAK proteins on the outer membrane of mitochondria,
which leads to the release of cytochrome C
and subsequent activation of CASP9, which, in turn,
activates CASP3 and CASP7, thereby performing
the process of apoptosis along the mitochondrial
pathway [13]. It should be noted that when exposed
to 5-(hydroxymethyl)furan-2-carbaldehyde showed
a change
in
the
expression
level
of CASP8 and
CASP3 of a similar
profile.
1,081,691,731,191,6
1,4
1,2
0,870,950,911,131,001,170,900,131,0
0,8
0,6
0,4
0,2
0
Compound No. 2, Compound No. 2, Compound No. 3,Compound No. 3,Compound No. 5.3,Compound No. 5.3,
4 .g/ml,
4 .g/ml,
4 .g/ml,
4 .g/ml,
4 .g/ml,
4 .g/ml,
72 hours EXP
72 hours CNV
72 hours EXP
72 hours CNV
72 hours EXP
72 hours CNV
BAX BCL2
Fig. 11. Changes in the level of replication and expression of BAX, BCL2 loci when exposed to 2,4-dihydroxy-2,5-dimethylfuran-3(2H)-one
(No. 2), 5-(hydroxymethyl) furan-2-carbaldehyde (No. 3) and 2,2,8-trimethyldecahydroazulene-5,6-dicarbaldehyde (No. 5.3)
25
20
15
10
5
0
1,601,691.2820.667,351,361,181,342,424,510,840,921,063,481,151,301,151,365,232,561,181,260,610,900,800,751,120,920,471,06
Compound No. 2, Compound No. 2, Compound No. 3,
Compound No. 3,
Compound No. 5.3,
Compound No. 5.3,
4 .g/ml,
4 .g/ml,
4 .g/ml,
4 .g/ml,
4 .g/ml,
4 .g/ml,
72 hours EXP
72 hours CNV
72 hours EXP
72 hours CNV
72 hours EXP
72 hours CNV
CDKN1B CDK1 CCND1 CCND3 RB1
Fig. 12. Changes in the level of replication and expression of CDKN1B, CDK1, CCND1, CCND3, RB1 loci under the influence of 2,4-dihydroxy-
2,5-dimethylfuran-3(2H)-one (No. 2), 5-(hydroxymethyl)furan-2-carbaldehyde (No. 3) and 2,2,8-trimethyldecahydroazulene-5,6-dicarbaldehyde
(No. 5.3)
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�������� � ��������������� ������� ��������� ����������� ������������� ���������� �� ��������� ����� HeLa
At the same time, 2,2,8-trimethyldecahydroazulene-
5,6-dicarbaldehyde increased the expression level
of TP53 and significantly reduced the expression
of MDM2, which may indicate a specific targeting
of the action of this compound. It should be borne
in mind that TP53 has tumor suppressive activity,
which largely explains its ability to induce cell death,
including apoptosis, through transcription-dependent
and transcription-independent mechanisms [14]. In
addition, the nuclear protein p53 transcriptionally activates
the expression of many pro-apoptotic genes
of the BCL-2 family, such as NOXA, PUMA, BID, BAD,
BIK, BAX, etc., whereas it inactivates the expression
of anti-apoptotic BCL-2, BCL�Xl and MCL1, leading
to mitochondrial apoptosis
[15]. The relationship
between changes in the expression level of TP53 and
BAX loci was also reflected in the results obtained.
As in the case of the TP53/MDM2 locus bundle, exposure
to the terpenoid 2,2,8-trimethyldecahydroazulene-
5,6-dicarbaldehyde affected the expression
level of BAX/BCL2 loci.
The changes in the expression level of CCND3 and
RB1
loci under the influence of 2,4-dihydroxy-2,5-dimethylfuran-
3(2H)-one were also revealed. This
compound is the only one used in our study, that led
to a decrease in the expression level of the CCND3
locus relative to RB1 (the expression level of RB1
was almost 2 times higher than the expression
level of CCND3). As is known, d-type cyclins (d1,
d2 and d3) are cell cycle regulators that activate
cyclin-dependent kinases cdk4 and cdk6, which are
often overexpressed in malignant neoplasms. The
CCND3 gene product interacts with the Rb tumor
suppressor protein and participates in its phosphorylation.
CDK4 activity is associated with this CCND3,
which is necessary for the transition of the cell cycle
to the G2 phase. Inhibition of CCND3 and cyclin-d
cdk4/6
kinase in tumor cells with a high content of
retinoblastoma rb1 protein causes cell cycle arrest.
However, reducing only the level of rb1 in tumor cells
does not lead to
a stop in proliferation [16]. The data
on the change in the expression of CCND3 and RB1
are consistent with the data of objective control from
photographs obtained using an inverted microscope
and data from flow cytofluorometry.
CONCLUSION
The study made it possible to establish the multidirectional
effect of secondary metabolites of P. hibridus
(L.)
on
the
death
and apoptosis
of HeLa cells.
The data obtained by
digital drip PCR revealed a maximum
increase in the expression of genes responsible
for regulating apoptosis (CASP3, CASP8, TP53, BAX)
under the action of 2,2,8-trimethyldecahydroazulene-
5,6-dicarbaldehyde, as well as a change in the
expression of CCND3 and RB1 genes under
the influence
of 2,4-dihydroxy-2,5-dimethylfuran-3(2H)-one. At
the same time, according to
cytometry and flow
cytofluorometry,
a more pronounced proapoptogenic
(cytotoxic)
effect was detected in 2,4-dihydroxy-2,5-dimethylfuran-
3(2H)-one. It should be noted that in our
work, the expression index reacted most actively to
the studied substances, which, in some cases, was
dissonant with both gene replication and the level
of mortality and apoptosis of tumor cells. Perhaps
chemical
modifications
of the
compounds
used by
us will have a more pronounced effect both at the
molecular genetic level and at the cellular level.
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Information about authors:
Elena Yu. Zlatnik � Dr. Sci. (Med.), MD, Professor, Chief Researcher, Laboratory
of Immunophenotyping of Tumors, National Medical Research Centre
for Oncology, Rostov-on-Don, Russian Federation
ORCID: https://orcid.org/0000-0002-1410-122X, SPIN: 4137-7410, AuthorID: 327457, ResearcherID: AAI-1311-2020, Scopus
Author ID: 6603160432
Yaroslav S. Enin � Junior Researcher, Laboratory
of Molecular Oncology, National Medical Research Centre for Oncology, Rostov-on-Don, Russian
Federation
ORCID: https://orcid.org/0000-0002-4572-1579, SPIN: 7683-2286, AuthorID: 840050, Scopus Author ID: 57196464479
Oleg N. Burov � Cand. Sci. (Chem.), Associate Professor, Department of Natural and High Molecular Compounds, Faculty
of Chemistry, Southern
Federal University, Rostov-on-Don, Russian Federation
ORCID: https://orcid.org/0000-0002-7704-033X, SPIN: 5269-7656, AuthorID: 642948, ResearcherID: A-8428-2014, Scopus Author ID: 23033004000
Elena S. Bondarenko � Junior Researcher, Laboratory of Immunophenotyping of Tumors, National Medical Research Centre for Oncology,
Rostov-on-Don, Russian Federation
ORCID: https://orcid.org/0000-0002-8522-1026, SPIN: 3117-4040, AuthorID: 865798, Scopus Author ID: 57200132337
Alexander B. Sagakyants � Cand. Sci. (Biol.), Head of the Laboratory
of Immunophenotyping of Tumors, National Medical Research Centre for
Oncology, Rostov-on-Don, Russian Federation
ORCID: https://orcid.org/0000-0003-0874-5261, SPIN: 7272-1408, AuthorID: 426904, ResearcherID: M-8378-2019, Scopus Author ID: 24329773900
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Denis S. Kutilin � Cand. Sci. (Biol.), Leading Researcher, Laboratory
of Molecular Oncology, National Medical Research Centre for Oncology,
Rostov-on-Don, Russian Federation
ORCID: https://orcid.org/0000-0002-8942-3733, SPIN: 8382-4460, AuthorID: 794680, Scopus Author ID: 55328886800
Yulia V. Dzigunova � Senior Lecturer, Department of Botany, Academy
of Biology
and Biotechnology. DI. Ivanovoskogo Southern Federal University,
Rostov-on-Don, Russian Federation
SPIN: 2204-2967, AuthorID: 1062681
Inna A. Novikova � Dr. Sci. (Med.), MD, deputy director for science, National Medical Research Centre for Oncology, Rostov-on-Don,
Russian Federation
ORCID: https://orcid.org/0000-0002-6496-9641, SPIN: 4810-2424, AuthorID: 726229, ResearcherID: E-7710-2018, Scopus Author ID: 7005153343
Yury
V. Przhedetskiy
� Dr. Sci. (Med.), MD, Professor, Head of the Department of Reconstructive Plastic Surgery
and Oncology, National Medical
Research Centre for Oncology, Rostov-on-Don, Russian Federation
ORCID: https://orcid.org/0000-0003-3976-0210, SPIN: 3888-6265, ResearcherID: ATT-7598-2020, Scopus Author ID: 57188731912
Contribution of the authors:
Zlatnik E. Yu. � manuscript editing;
Enin Ya. S. � concept and design of the study, experiment coduction, writing the manuscript;
Burov O. N. � isolation and verification of compounds from plant material;
Bondarenko E. S. � cytofluorimetric analysis;
Sagakyants A. B. � analysis of the cytofluorometry results;
Kutilin D. S. � manuscript editing;
Dzigunova Yu.V. � collection and determination of plant material;
Novikova I. A. � design of the bibliography, manuscript editing;
Przhedetskiy Yu. V. � statistical data processing.