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4THE INFLUENCE OF THE CONSTANT ILLUMINATION ON THE ULTRASTRUCTURE OF RAT'S HEPATOCYTES Areshidze DA, Kozlova MA, Chernikov VP, Kondashevskaya MV
Academician Petrovsky Scientific Centre of Surgery, Moscow, Russia, e-mail: [email protected] For the citation:
Areshidze DA, Kozlova MA, Chernikov VP, Kondashevskaya MV. The influence of constant illumination on the ultrastructure of rat's hepatocytes. Morfologicheskie Vedomosti - Morphological newsletter. 2022;30(4):758. https://doi.org/10.20340/mv-mn.2022.30(4).758
Summary. The disorganization of natural biorhythms in the modern world is mostly attributed to the violation of circadian rhythms due to light pollution. Urbanization is directly interconnected with an excess of artificial lighting. As a one-time phenomenon, light pollution leads to a reversible shift in circadian rhythms, but in the case of constant influence, it leads to the development of desynchronosis. It is known that light pollution contributes to the development of nonalcoholic fatty liver disease, primary biliary cirrhosis, and metabolic disorders. The study aimed to investigate the changes in micro-morphometric parameters and ultrastructure of hepatocytes of Wistar rats under the influence of normal lighting and constant lighting exposure. This study was conducted on 120 outbred stock male Wistar rats at an age of 6 months, with a body weight of 350 g. The rats were divided into 2 equal groups. The control group included 60 rats, kept in standard laboratory conditions under a normal cyclical «light-dark» lighting regime (10:14, 10 hours of light - from 8:00 to 18:00, 14 hours of darkness - from 18:00 to 8:00) within 3 weeks. The experimental group included 60 rats kept in standard laboratory conditions under constant lighting within 3 weeks. To obtain the results, histological, micro morphometric methods and transmission electronic microscopy were used. The revealed changes of the hepatocytes under the influence of constant lighting indicate that a violation of the illumination regime is a potent factor causing damage and structural changes in the liver. Understanding the mechanisms underlying the liver's response to circadian rhythm disruption and associated damage is important to form patient-specific recommendations on lifestyle and behavioral regimens.
Key words: hepatocyte, liver, micro-morphometry, constant lightning, desynchronosis
Article received 7 October 2022 Article accepted 10 January 2023
ВЛИЯНИЕ ПОСТОЯННОГО ОСВЕЩЕНИЯ НА УЛЬТРАСТРУКТУРУ
ГЕПАТОЦИТОВ КРЫС Арешидзе Д.А., Козлова М.А., Черников В.П., Кондашевская М.В.
Российский научный центр хирургии имени академика Б.В. Петровского, Москва, Россия,
e-mail: [email protected]
Для цитирования:
Арешидзе Д.А., Козлова М.А., Черников В.П., Кондашевская М.В. Влияние постоянного освещения на ультраструктуру гепатоцитов крыс. Морфологические ведомости. 2022;30(4):758. https://doi.org/10.20340/mv-mn.2022.30(4).758
Резюме. Дезорганизация природных биоритмов в современном мире чаще всего связана с нарушением циркадианных ритмов из-за светового загрязнения. Урбанизация напрямую взаимосвязана с избытком искусственного освещения. Как разовое явление световое загрязнение приводит к обратимому сдвигу циркадианных ритмов, а при постоянном воздействии - к развитию десинхроноза. Известно, что световое загрязнение способствует развитию неалкогольной жировой дистрофии печени, первичного билиарного цирроза, нарушению обмена веществ. Целью исследования было изучение изменений микроморфометрических показателей и ультраструктуры гепатоцитов крыс линии Вистар под влиянием обычного освещения и постоянного светового воздействия. Исследование проведено на 120 беспородных крысах-самцах линии Вистар в возрасте 6 месяцев, массой тела 350 грамм. Крыс разделили на 2 равные группы. В контрольную группу вошли 60 крыс, содержавшихся в стандартных лабораторных условиях при обычном циклическом «свет-темнота» световом режиме (10:14, 10 часов света — с 8:00 до 18:00, 14 часов темноты — с 18:00) в течение 3 недель. В экспериментальную группу вошли 60 крыс, которых содержали в стандартных лабораторных условиях при постоянном освещении также в течение 3 недель. Для получения результатов использовались гистологические, микроморфометрические методы и просвечивающая электронная микроскопия. Выявленные изменения гепатоцитов под влиянием постоянного освещения свидетельствуют о том, что нарушение режима освещения является сильнодействующим фактором, вызывающим повреждение и структурные изменения клеток печени. Понимание механизмов, лежащих в основе реакции клеток печени на нарушение циркадного ритма и связанное с ним повреждение, важно для формирования индивидуальных рекомендаций по образу жизни и режимам поведения.
Ключевые слова: гепатоцит, печень, микроморфометрия, постоянное освещение, десинхроноз
Статья поступила в редакцию 7 октября 2022 Статья принята к публикации 10 января 2023
Introduction. The normal functioning of living systems depends on several rhythmic environmental and internal cycles, which are referred to as biological rhythms. One of the most significant groups of rhythms is the group of diurnal, or circadian rhythms (onwards - CRs) [1]. Biological rhythms are known to be modulated under the influence of periodic environmental factors, the leading role among which is played by light exposure [2]. Prolonged contravention of natural biological rhythms leads to an adaptive irregularity, to desynchronosis, which can entail the development of a variety of pathological conditions in an organism [3]. The liver plays a key role in maintaining metabolic homeo-stasis and serves as a unique functional system That is involved in many mechanisms of regulation, reaction, and adaptations [4-5]. The autonomous biological clock of hepato-cytes at the molecular genetic level includes the Bmal1 gene, paired with the Clock gene, Per genes (Per1, Per2, Per3), and Cry genes coding cryptochrome proteins (Cry1, Cry2), which are involved in the formation of specific genetic profiles with other numerous genes [6-7]. BMAL1 /CLOCK also binds to the
E-Box DBSs present in the genes of the nuclear receptors Rev-Erba (NR1D1) and Re-vErbb (NR1D2) to activate their transcription, while the presence of ROR-response element (RORE) DBSs in the Rev-Erba/b genes mediate their autorepression. REV-ERBs also inhibit (through RORE DBSs) the transcription of their activators Bmal1 and Clock, thus constituting the second loop of the CC-oscillator
[8]. The main central pacemakers of circadian rhythms in mammals are the suprachiasmatic nuclei (SCN) of the hypothalamus. The rhythm-organizing function of the SCN is modulated by environmental time-giver stimuli (timers), the main of which is light. The SCN transmits a «time signal» to other organs, synchronizing peripheral pacemakers
[9]. These peripheral structures dependent on SCN regulation are found in the olfactory bulb, arcuate nucleus, pineal gland, and adrenal cortex and perform a synchronizing function by synthesis of regulating hormones [10-12]. Feeding habits and ambient temperature are also shown to act as circadian rhythm timers [13-14].
The disorganization of natural bio-rhythms in the modern world is mostly attributed to the violation of circadian rhythms due to light pollution. Urbanization is directly interconnected with an excess of artificial lighting. As a one-time phenomenon, light pollution leads to a reversible shift in circadi-an rhythms, but in the case of constant influence, it leads to the development of desyn-chronosis [15]. The level of light pollution correlates with such metabolic changes as a decrease in high-density lipoprotein levels, an increase in triglyceride levels, and carbohydrate metabolism disorders [16-17]. Violation of the light regime is one of the possible premises of the occurrence of metabolic syndrome and can increase the risk of developing type 2 diabetes mellitus and atherosclerosis [18-19]. In addition, there is evidence that changes caused by chronic desynchronosis can lead to the development of malignant liver tumors [20-21]. It is known that light pollution contributes to the development of nonalcoholic fatty liver disease, primary biliary cirrhosis, and metabolic disorders [22-26]. However, the effect of constant illumination on the ultrastructure of hepatocytes underlying the above pathologies remains practically unexplored. Functional changes in hepatocytes are reflected in a variety of morphological structure modifications and cell death [27-28].
The study aimed to investigate the changes in micro-morphometric parameters and ultrastructure of hepatocytes of Wistar rats under the influence of normal lighting and constant lighting exposure.
Materials and research methods. This study was conducted on 120 outbred stock male Wistar rats at an age of 6 months, with a body weight of 350 g. Animals were taken from the «Stolbovaya» Nursery affiliated with the Scientific Center of Biomedical Technologies of the Federal Medical and Biological Agency. All the animals were housed in plastic cages with free access to water and food. The rats were divided into 2 equal groups. The control group included 60 rats, kept in standard laboratory conditions under a normal cyclical «light-dark» lighting regime (10:14, 10 hours of light - from 8:00 to 18:00, 14 hours of darkness - from 18:00 to 8:00) within 3 weeks. The experimental group included 60 rats kept in standard laboratory
conditions under constant lighting for 3 weeks. Illumination intensity was 300 luces for animals of both groups, the illuminance was equal for all the cages. Since the feeding regime can significantly affect the circadian rhythms of the liver, the animals were provided with constant, round-the-clock access to food and drink to eliminate the effect of this factor.
Withdrawal of animals from the experiment was carried out three weeks after the start of the experiment in a carbon dioxide chamber equipped with a device for the upper gas supply (100% CO2) at 9:00, 15:00, 21:00 and 3:00. The chamber volume was filled with gas at a rate of 20% per minute to avoid dyspnea and pain in animals. After sacrifice, evisceration was performed. All animal experiments were performed according to compliance with EC Directive 86/609/EEC and with the Russian law regulating experiments on animals. Keeping of animals and experiments were performed following the European Convention for the Protection of Vertebrate Animals used for Experimental and other Scientific Purposes (Strasbourg, 18 March 1986). The study was approved by the Local Bioethics Committee of the Academician Avtsyn Scientific Research Institute of Human Morphology, Minutes № 27/3 (11/10/2021).
The liver was fixed in 10% neutral buffered formalin with further processing in alcohols of increasing concentration (50°, 60°, 70°, 80°, and 96°) and xylol, followed by placement in a Histomix histological medium. Liver samples were embedded in paraffin, and serial sections with a thickness of 5-6 ^m were prepared. Histological sections were made on the sliding microtome Leica SM2010 R. Hematoxylin-eosin staining was carried out. Stained sections were put in a BioMount mounting medium. The microscopy of histo-logical preparations was performed using a Leica DM 2500 microscope with the use of a Leica DFC 290 digital camcorder. 10 digital images of randomly selected visual fields were taken at a magnification of x400 and x1000 from each preparation. With the use of the digital «ImageJ» Program the cross-sectional nuclear area (Sn), small (d) and long (D) diameters of a nucleus, perimeter of the nucleus (Pn), a cross-sectional area of the cell
(Sc), small (a) and long (b) diameters of the cell were studied. The measurements were carried out in micrometers after preliminary geometric calibration on an object-micrometer scale digitized with the same magnification. Several parameters were calculated using the appropriate formulas: the nucleocytoplasmic ratio as NCR=Sn/ (Sc-Sn); mean diameter of nucleus M=(D+d)/2, in which D - long diameter, d - small diameter; a volume of nuclei Vn=0,523^M3; cell volume Vc=0,523^M3, in which M - mean diameter of cell; elongation index of nucleus EI=D/d, in which D - long diameter, d - small diameter. The ratio of the volume of the nucleus to its area was also determined [29]. For the calculation of the coefficient of nuclear form, the following formula was used: CF=4*n*Sn/Pn2 in which Sn - the area of the nucleus, Pn - the perimeter of a nucleus. The contoured index of a nucleus, which represents the relief of its surface, was calculated according to the formula: CI= Pn/V Sn (Sn -the area of the nucleus, Pn - the perimeter of a nucleus) [29]. To calculate the proportion of binuclear hepatocytes, we examined 10 fields from each preparation with a magnification of x400. The percentage of binuclear cells was expressed as a percentage of the total number of hepatocytes in the field of view.
For the electronic microscopy liver samples of 2 mm3 size were fixed with a 2,5% solution of glutaraldehyde in 0,1 M phosphate buffer (pH 7,4), additionally fixed in a 1% solution of osmium tetroxide (OsO4), dehydrated in ethanol according to the generally accepted scheme, contrasted with 1% uranyl acetate in 70% ethanol during dehydration and poured into the eponaraldite mixture according to the standard procedure. Ultrathin sections were obtained on an LKB-III ultramicrotome, the sections were additionally counterstained with lead citrate according to the Reynolds method and viewed with a JEM-100CX transmission electron microscope. Photo fixation of preparations was carried out using a Gatan ES500W Erlangshen camera at a magnification of x5000 and *6700. The shapes of the hepatocyte nuclei and the condition of their organelles (mitochondria, ribosomes) were evaluated, and the presence of lipid vacuoles was revealed during transmission electronic microscopy. The obtained data were
analyzed by calculating average values, standard deviation, and arithmetic mean error. The data are presented as mean±SD. To assess the significance of differences, the Student's t-test was used. Changes were considered reliably significant at p<0,05.
Results and Discussion. Exposure to constant light conditions for three weeks resulted in significant differences in micro morphometric parameters from the norm. We noted an increase in the area and volume of
hepatocytes, causing a decrease in the nucleocytoplasmic ratio, as well as a decrease in the proportion of binuclear cells relative to the control. At the same time, the small and average diameters of the nuclei increased and the index of its contour decreased (Fig. 1, A, B, C, and D).
Electronic microscopy studies made it possible to establish several distinct changes in the ultrastructure of hepatocytes. The nuclei of a significant part of the cells, in comparison
A
Control group Experimenral group
C D
Fig. 1. Diagrams of indicators of changes in hepatocytes under the influence of constant lighting. A: Sn -cross-sectional area of nuclei; Sc - cross-sectional area of cells. B: Vn - volume of nuclei; Vc - cell volume. С: CI - contour index of nuclei; EI - elongation index of nuclei; CF - coefficient of a form of nuclei; NCR - the nucleocytoplasmic ratio. D: PN - the perimeter of the nucleus; SDN - small diameters of nuclei; LDN -long diameters of nuclei; MDN - mean diameters of nuclei. Common notes: * - p<0,05, ** - p<0,005, *** -p<0,0005 - in comparison with the same parameters of animals of the control group
Рис. 1. Диаграммы показателей изменения гепатоцитов при воздействии постоянного освещения. A: Sn - площадь поперечного сечения ядра; Sc - площадь поперечного сечения клетки. B: Vn - объем ядра; Vc - объем клетки. С: CI - индекс контура ядра; EI - индекс удлиненности ядра; CF -коэффициент формы ядра; NCR - ядерно-цитоплазматическое отношение. D: PN - периметр ядра; SDN - малый диаметр ядра; LDN - большой диаметр ядра; MDN - средний диаметры ядер. Примечания: * - р<0,05, ** - р<0,005, *** - р<0,0005 - в сравнении с аналогичными показателями животных контрольной группы
with the control (Fig. 2A), acquired sinuous contours and sometimes lost their rounded shape. The cytoplasm was poor with glyco-
gen, the granular endoplasmic reticulum is noticeably reduced, so-called «ribosomal shedding», (which indicates a decrease in
protein synthesis in hepatocytes) is observed (Fig. 2B). The significant number of cells contained a large amount of swollen mitochondria (Fig. 2C, 2D). Among hepatocytes, the
single leukocytes (Fig. 2D) and a decrease in the proportion of binuclear cells were noted. Dying hepatocytes were also detected (Fig. 2E).
A
B
C
D
E
Fig 2. Ultramicrophotos of structural changes in hepatocytes of rats. A - hepatocyte of rat of a control group. The rounded nucleus, mitochondria with a dense matrix, and glycogen grains are observed. B-F - hepato-cytes of rats of the experimental group. B - the nucleus with a sinuous contour and freely located ribosomes in the hepatocyte. C - hepatocyte containing numerous edematous mitochondria with an enlightened matrix. D - significantly pronounced degree of swelling of mitochondria (above) and a leukocyte (below). E -an area of necrosis development in the liver of rats of the experimental group. TEM. The magnification on A, D, E - x6700, on B - x8000, on C - *5000
Рис. 2. Ультрамикрофотографии структурных изменений клеток печени крыс. А - гепатоцит крыс контрольной группы. Наблюдаются округлое ядро, митохондрии с плотным матриксом, зерна гликогена. B-F - клетки крыс опытной группы. B - ядро гепатоцита с извилистым контуром, свободно расположенные рибосомы. C - гепатоцит, содержащий многочисленные отечные митохондрии с просветленным матриксом. D - часть гепатоцита со хорошо заметно значительное набухание митохондрий гепатоцита выраженной степенью (вверху) и лейкоцита (внизу). E - зона развития некрозов в печени крыс экспериментальной группы. Электронная микроскопия. Ув.: А, D, E - *6700, B - х8000, C
- *5000
Our results show an increase in the nuclei diameters with a change in the elongation index of the nuclei. This phenomenon is a sign of commencing destruction of nuclei [30]. Micro-morphometry results allowed us to assert ongoing structural changes in the hepatocytes of rats of the experimental group. Notable hepatocyte hypertrophy can be seen in all individuals exposed to constant light within three weeks.
The noted decrease in the proportion of binuclear hepatocytes in the experimental group can be explained by the fact that al-
most all cell divisions produced daughter mononuclear cells, regardless of the number of nuclei in mother hepatocytes [31]. At the same time, processes of compensatory cell hypertrophy are the signs of liver regeneration and compensatory changes seen in stressful conditions [32]. Considering literature data indicating that initial stages of hepatocyte adaptation to pathological influence are predominantly processes of intracel-lular regeneration, it can be assumed that in the experimental group, the process of adaptation to light pollution occurs mainly
through intracellular regeneration which manifests itself by hepatocyte hypertrophy [33]. Hepatocyte hypertrophy, occurring after a partial hepatectomy (PHx), shows an average 150% size increase in hepatocytes, and the cells pass and move on to proliferation only after 1-2 days [34]. A similar effect can be seen in our results. Hepatocyte hypertrophy is the first reaction to liver damage, and proliferation occurs when hypertrophy is not enough to restore the initial mass of the organ. Hypertrophy of hepatocytes manifests through an increase in cellular organelles (mitochondria, lysosomes, endoplasmic re-ticulum, and ribosomes) and the accumulation of lipids and glycogen [35-36].
Such changes are also largely determined by the fact that the production of pineal melatonin, which demonstrates numerous hepatoprotective effects in several pathologies, almost stops under conditions of constant illumination [37-39]. Thus, melatonin can activate hepatocyte proliferation by inhibiting IKKa, JNK1, and cJUN (c-Jun N-terminal kinases), which inhibit mitotic and apoptotic activity, under standard light conditions, but in the absence of pineal melato-nin, their acute decrease is observed [40-41]. It is known that one of the effects of melato-nin is an increase in the ploidy and proportion of binuclear hepatocytes, and pinealec-tomy reduces the intensity of proliferation in the liver after its partial resection [40-42].
The changes seen in the hepatocytes of the experimental group in our study represent the activation of defensive and adaptive mechanisms and the onset of cellular damage in the liver. As such, these changes represent the negative influence of light pollution on hepatocyte health. As our study presents an extreme but short-term representation of light pollution, it does not directly represent
the effect of urban light pollution. Despite this, our results show a link between light pollution and liver damage, which warrants further research into the specific effect of light pollution of different extents on human liver health.
The study showed that cellular changes are seen in the hepatocytes, representing stress-related changes. An increase in the area and volume of hepatocytes is usually associated with an increase in the level of stress hormones. Stimulation of a1-adrenergic receptors increases the nuclear volume of hepatocytes and the density of nu-cleoli due to the release of intracellular Ca2+ and subsequent activation of DNA polymer-ase. In addition, endotoxins and TNFa increase the volume of hepatocytes by activating signaling pathways and retaining Na+ and water [43-44]. Swelling of hepatocytes increases bile excretion and has a hepatopro-tective effect, causes an anabolic response, and is considered a kind of trigger that activates the suppression of proliferation during the regeneration of liver cells [44-45]. The showed changes in our experiment allow us to conclude that chronic disruption of the light regime has serious implications on the liver which can affect the health of a human. Further studies are needed to make evidence-based claims on the implications of chronic light pollution on liver state.
Conclusion. The revealed changes of the hepatocytes under the influence of constant lighting indicate that a violation of the illumination regime is a potent factor causing damage and structural changes in the liver. Understanding the mechanisms underlying the liver's response to circadian rhythm disruption and associated damage is important to form patient-specific recommendations on lifestyle and behavioral regimens.
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The authors declare that they have no conflicts of interest in the planning, implementation, financing and use of the results of this study. The research was carried out within the state task of the Academician Petrovsky National Scientific Centre of Surgery No 122030200535-1
INFORMATION ABOUT AUTHORS
David A. Areshidze, Candidate of Biological Sciences, Head of
the Laboratory of Cell Pathology of the Academician Avtsyn
Research Institute of Human Morphology of the Academician
Petrovsky Scientific Centre of Surgery,
Moscow,
Russia;
e-mail: [email protected]
Mariya A. Kozlova, Scientific Researcher of the Laboratory of Cell Pathology of the Academician Avtsyn Research Institute of Human Morphology of the Academician Petrovsky Scientific Centre of Surgery, Moscow, Russia;
e-mail: [email protected]
Valery P. Chernikov, Candidate of Medical Sciences, Leading Scientific Researcher of the Laboratory of Cell Pathology of the Academician Avtsyn Research Institute of Human Morphology of the Academician Petrovsky Scientific Centre of Surgery, Moscow, Russia; e-mail: [email protected]
Marina V. Kondashevskaya, Doctor of Biological Sciences,
Docent, Main Scientific Researcher of the Laboratory of Cell
Pathology of the Academician Avtsyn Research Institute of
Human Morphology of the Academician Petrovsky Scientific
Centre of Surgery,
Moscow,
Russia;
e-mail: [email protected]
Авторы заявляют об отсутствии каких-либо конфликтов интересов при планировании, выполнении, финансировании и использовании результатов настоящего исследования. Исследование выполнено в рамках государственного задания Российского научного центра хирургии имени академика Б.В. Петровского № 122030200535-1
ИНФОРМАЦИЯ ОБ АВТОРАХ
Арешидзе Давид Александрович, кандидат биологических наук, заведующий лабораторией патологии клетки Научно-исследовательского института морфологии человека имени академика А.П. Авцына Российского научного центра хирургии имени академика Б.В. Петровского, Москва, Россия; e-mail: [email protected]
Козлова Мария Александровна, научный сотрудник лаборатории патологии клетки Научно-
исследовательского института морфологии человека имени академика А.П. Авцына Российского научного центра хирургии имени академика Б.В. Петровского, Москва, Россия; e-mail: [email protected]
Черников Валерий Петрович, кандидат медицинских наук, ведущий научный сотрудник лаборатории патологии клетки Научно-исследовательского института морфологии человека имени академика А.П. Авцына Российского научного центра хирургии имени академика Б.В. Петровского, Москва, Россия; e-mail: [email protected]
Кондашевская Марина Владиславовна, доктор биологических наук, доцент, главный научный сотрудник лаборатории патологии клетки Научно-исследовательского института морфологии человека имени академика А.П. Авцына Российского научного центра хирургии имени академика Б.В. Петровского, Москва, Россия; e-mail: [email protected]
