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OBSERVING THE DYNAMICS OF THE NAD+ TO NADH RATIO IN DANIO RERIO EMBRYO TISSUES USING A GENETICALLY ENCODED BIOSENSOR
Bilan DS1>2, Shokhina AG1, Panova AS1,3, Belousov VV1*2^
1 Laboratory of Molecular Technologies,
Shemyakln-Ovchlnnlkov Institute of Bioorganic Chemistry, RAS, Moscow, Russia
2 Department of Brain-Machine Interfaces, Research Institute of Translational Medicine, Pirogov Russian National Research Medical University, Moscow, Russia
3 Department of Biochemistry, Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia
The zebrafish Danio rerio is a popular model species for biomedical research focusing on modeling human diseases and screening of therapeutic drugs. Genetically encoded biosensors based on fluorescent proteins are widely used in many laboratories worldwide to study the biology of living systems of various complexity in vivo. The main advantage of these molecular tools is that they allow observing biological processes in intact systems in real time. In the present work we study the dynamics of the intracellular ratio of NAD+ to NADP in the yolk sac and tissues of D. rerio larvae using the SoNar biosensor following the injection of glycolisis end products, lactate and pyruvate.
Keywords: genetically encoded biosensors, Danio rerio, pyruvate, lactate
Funding: this work was supported by the Russian Foundation for Basic Research (Grant 16-34-60175) and the Russian Federation Presidential Grant MK-6339.2016.4. Experiments were partially carried out using the equipment provided by the IBCH core facility (CKP IBCH, supported by Russian Ministry of Education and Science, grant RFMEFI62117X0018).
PK] Correspondence should be addressed: Vsevolod Belousov
ul. Miklukho-Maklaya, d. 16/10, Moscow, Russia, 117997; belousov@ibch.ru
Recieved: 05.12.2017 Accepted: 25.12.2017 DOI: 10.24075/brsmu.2018.005
РЕГИСТРАЦИЯ ДИНАМИКИ СООТНОШЕНИЯ НАД+/НАДН В ТКАНЯХ ЭМБРИОНОВ РЫБ DANIO RERIO С ПОМОЩЬЮ ГЕНЕТИЧЕСКИ КОДИРУЕМОГО БИОСЕНСОРА
Д. С. Билан1,2, А. Г. Шохина1, А. С. Панова1,3, В. В. Белоусов1,2 123
1 Лаборатория молекулярных технологий,
Институт биоорганической химии имени академиков М. М. Шемякина и Ю. А. Овчинникова РАН, Москва
2 Отдел нейро-компьютерных интерфейсов, НИИ трансляционной медицины,
Российский национальный исследовательский медицинский университет имени Н. И. Пирогова, Москва
3 Кафедра биохимии, биологический факультет,
Московский государственный университет имени М. В. Ломоносова, Москва
Рыба Danio rerio является популярным модельным объектом во многих медико-биологических исследованиях, в том числе для моделирования человеческих заболеваний и скрининга лекарственных препаратов. Генетически кодируемые биосенсоры на базе флуоресцентных белков широко используются во всем мире для исследований сложных биологических процессов в живых системах любого уровня сложности in vivo. Главное преимущество таких молекулярных инструментов в том, что генетически кодируемые индикаторы позволяют исследователям наблюдать за биологическими процессами в интактных системах в режиме реального времени. В данной работе мы впервые протестировали биосенсор SoNar для регистрации такого важного внутриклеточного параметра, как соотношение НАД+/НАДН, в тканях эмбрионов рыбы D. rerio. Мы исследовали, как изменяется динамика соотношения НАД+/НАДН в желточном мешке и тканях тела малька рыбы при инъекции продуктов гликолиза лактата и пирувата.
Ключевые слова: генетически кодируемые биосенсоры, Danio rerio, пируват, лактат
Финансирование: работа выполнена при поддержке гранта Российского фонда фундаментальных исследований мол_а_дк № 16-34-60175 и гранта Президента РФ № МК-6339.2016.4, а также с использованием оборудования ЦКП ИБХ, поддержанного Минобрнауки России, идентификатор соглашения RFMEFI62117X0018.
РК| Для корреспонденции: Белоусов Всеволод Вадимович
ул. Миклухо-Маклая, д. 16/10, г. Москва, 117997; belousov@ibch.ru
Статья получена: 05.12.2017 Статья принята к печати: 25.12.2017
DOI: 10.24075/vrgmu.2018.005
The zebrafish Danio rerio is a popular model species for in vivo biomedical research. It has a few advantages over other lab animals: fish are prolific breeders that require little upkeep and develop rapidly. Due to their optical clarity, Danio rerio embryos are a good object for microscopy. Besides, this fish's genome is very well studied and hence easy to manipulate. Therefore, D. rerio are often used to study gene functions
and developmental biology of vertebrates. Because cell biochemistry and functional activity of proteins in D. rerio resemble those of mammals, this species is used for modeling human diseases, testing toxicity of chemical compounds in preclinical trials, and in therapeutic drug screening.
In the last few years D. rerio has been successfully exploited as a model organism to study acute lymphoblastic leukemia
[1-3], melanoma [4, 5], muscular dystrophy [6], diabetes mellitus [7], pathological conditions of the heart [8-10], kidneys [11, 12], and central nervous system [13, 14], including brain ischemia [15, 16]. Such vertebrate models are handy when it comes to investigating effects of various chemical compounds on the organism in health and pathology. The easiest way to administer a compound of interest to the fish is to add it into the water in the tank: the chemical will enter the fish's bloodstream through the gills. The majority of experiments are carried out in larval fish, though, meaning that drugs are normally injected straight into the yolk sac. This method of drug delivery can be employed to assess cardiotoxicity of aspirin, clomipramine, nimodipine, varapamil and some others medications [17, 18]. Larval fish are also used to study metabolites that are part of normal mammalian biochemistry. For example, in one of the experiments excess amounts of glucose were administered to fish embryos via injections to describe expression profiles of genes involved in carbohydrate metabolism [19]. It is also possible to infect D. rerio larvae with injections of bacterial cells to observe how infection progresses [20-22] or even mammalian cells to study tumor growth [23, 24].
Genetically encoded biosensors based on fluorescent proteins have taken in vivo studies of physiology and pathology to a new level. Each biosensor is a chimeric protein molecule consisting, as a rule, of a sensing moiety and a fluorescent domain. The sensor domain detects changes in the surrounding environment, such as fluctuations in the intracellular concentrations of a studied compound. The fluorescent component "reports" interactions between the sensing domain and the compound of interest, and the obtained signal is then interpreted. Such biosensors are encoded by a gene that can be incorporated into any living organism. What is important is that this approach can be used in real-time imaging of biochemical processes in a living organism [25]. Oftentimes genetically encoded biosensors are the only available tool for looking into complex biological events. Fluorescent biosensors have been extensively used in model D. rerio species to study embryogenesis [26], inflammation [27], and organ regeneration [28].
In this work we have pioneered the use of the genetically encoded biosensor SoNar [29] as a tool for monitoring the redox state of nicotinamide adenine dinucleotide (NAD) in the cytoplasm of D. rerio tissues. The ratio of its oxidized to reduced forms (NAD+/NADH) is critical not only for cell metabolism but also for the regulation of many signaling cascades [30-32]. We have found out that the NAD+/NADH ratio changes both in the yolk sac and body of a D. rerio embryo following lactate and pyruvate injections.
The SoNar biosensor [29] is based on the bacterial protein T-Rex of Thermus aquaticus that regulates transcription of a few enzymes in response to fluctuations in the intracellular NAD+/NADH ratio. One of the biosensor's components is the fluorescent protein cpYFP integrated into the mobile region of T-Rex. Conformational changes accompanying the binding of T-Rex to NAD+ or NADH are propagated to the fluorescent protein affecting its spectral properties (Fig. 1). SoNar fluorescence excitation spectrum typically has two peaks at 420 and 490 nm; the sensor emission peak is at 518 nm. The signal is calculated as a ratio of fluorescence intensities excited at 420 nm and 490 nm (F420/F490) [29]. Thus, the signal is ratiometric, which is particularly important for in vivo research, as it helps to avoid artifacts related to different expression levels of the sensor in different cells, motion, changes of the object's shape or tissue thickness.
METHODS
AB/TL Danio rerio fish were kept in a specially equipped room at 26.5 °C under 12:12 light conditions. The experiments were conducted in compliance with the Declaration of Helsinki. To obtain progeny, parent fish were paired in separate tanks containing 500 ml of E3 medium 4 hours before the lights went out. Eggs were collected when the lights were turned back on.
In our experiment we used SoNar [29] and SypHer-2 [33] biosensors. To obtain larval D.rerio fish expressing these biosensors in their tissues, we synthesized biosensor mRNA in vitro using the commercial mMessage mMachine SP6 Transcription kit (Ambion, USA). Then 1 nl of 0.1 pg/pl mRNA was injected into the yolk sac of single-cell fish embryos using Eppendorf Microinjector 5242. The treated fish were kept in Petri dishes at 26.5 °C under standard 12:12 light conditions. Twenty four hours after the injection, the embryos were examined under the fluorescence microscope to select those that were fluorescent. Before microscopy the embryos were manually stripped of chorions, immobilized in 0.02 % tricaine solution and mounted in a drop of 1.5 % low-melting point agarose. One nl of 200 mM sodium lactate and sodium pyruvate solutions was injected in the yolk sac of each immobilized embryo. Prior to the injections of metabolites, biosensor signals were recorded in the yolk sac and body of each larval fish.
Microscopy was performed using the wide field fluorescence microscope Leica DM6000 (Leica, Germany), equipped with the HC PL FLUOTAR 10.0*0.30 DRY lens. Fluorescence was excited using excitation filters CFP BP436/20 and GFP BP470/40. Frame rate was 1 frame per minute. Images were processed in ImageJ (NIH). Graphs showing the dynamics of sensor signals were constructed using OriginPro 8.6 (OriginLab, USA). The same software was used to process data obtained at each time point.
RESULTS
We have tested the use of the genetically encoded sensor SoNar [29] in monitoring the NAD+/NADH ratio in D. rerio tissues. Briefly, we synthesized biosensor mRNA and injected it into the yolk sac of single-cell fish embryos. Twenty four
Fluorescence excitation
Fig. 1. Fluorescence excitation spectrum of the SoNar protein-based biosensor with two typical peaks at 420 nm and 490 nm. When NADH is added, fluorescence intensity increases at 420 nm and weakens at 490 nm. When NAD+ is added, signal intensity increases at 490 nm. The SoNar biosensor has one emission peak with emission maximum at 518 nm
hours after the injection we selected fluorescent embryos for further microscopy. SoNar fluorescence was recorded in two independent channels; fluorescence excitation wavelengths in each channel matched the two peaks of SoNar's fluorescence excitation spectrum (Fig. 1). We obtained two images of each fish embryo at 420 nm (F420) and 490 nm (F490) excitation. Using ImageJ we divided the images by one another; the resulting image was then painted in pseudocolors corresponding to the values of the F420/F490 ratio (Fig. 2, A, D). Again, using ImageJ we selected a few zones on the embryo's body and made further calculations. Graphs showing the dynamics of the F420/F490 ratio were constructed in OriginPro 8.6.
To monitor the dynamics of the NAD+/NADH ratio in the embryo tissues of D. rerio using the SoNar biosensor, we injected sodium lactate and pyruvate into the embryos. It is well known that the lactate/pyruvate pair is in equilibrium with free cytoplasmic NAD+/NADH owing to the reaction catalyzed by lactate dehydrogenase [34, 35]. Bearing that in mind, we injected 1 nl of 200 mM sodium lactate solution in the yolk sac of 10 embryos and 1 nl of 200 mM sodium pyruvate solution in the yolk sac of another 11 embryos. Prior to the injections, we recorded the signal emitted by the biosensor in the untreated
Lactate
(D)
tissues. This initial value was taken as 1 . After the injection, the fish were quickly put under the microscope and imaging was resumed with the same settings. Embryos injected with lactate demonstrated an increase in the F420/F490 ratio, indicating reduction of the NAD pool (Fig. 2, B). Similar signal dynamics observed in different parts of the embryo's body can be explained by rapid delivery of the metabolites from the yolk sac to other organs. The signal reached its maximum 5 min after the injection, gradually losing its intensity for the next 30 min until it finally reached its initial value, while lactate was being metabolized by cellular organelles. We expected to see an opposite effect with pyruvate. But the F420/F490 ratio decreased only in the yolk sac and even slightly increased in the embryo's body (Fig. 2, E). It means that small doses of pyruvate trigger different redox events in the intracellular NAD pool: oxidation in the yolk sac and reduction in the embryo's body.
Lactate or pyruvate transport into the cells can happen against the background of changing pH because it occurs in symport with H+ [36, 37]. The specific chromophore structure makes fluorescent proteins sensitive to pH fluctuations [38]. To assess a possible effect of pH on the SoNar signal intensity, we used SypHer2 previously developed in our lab as a control
Pyruvate
Before the injection
SoNar:
After the injection of 1 nl 200 mM lactate solution
Before the injection
SoNar:
After the injection of 1 nl 200 mM pyruvate solution
■ 'ipgß.
Max
Min
(B)
SoNar: 18-
(C)
1,0
SypHer2: 0.9
Max
Min
(F)
SypHer2:
0 5 10 15 20 25 30 35 40 Time, min
1,31,21,11,0-Jo,9-
^ 0,8-uT
0,70,60,50.4-
+ 200 mM sodium pyruvate
L
0 5 10 15 20 25 30 35 40 45 Time, min
__ the body of a D.rerio embryo
Signal dynamics in
10 15 20 25 30 35 40 Time, min
the yolk sac of a D.rerio embryo
Fig. 2. Changes in the NAU+/NAUH ratio and pH in the tissues ot one-day old D. rerio emPryos Petore and after pyruvate and lactate injections into the yolk sac. (A and D) Images of a D. rerio embryo body before and after injections of 1 nl 200 mM lactate (A) and pyruvate (D) solutions. Images are shown in pseudo-colors corresponding to the SoNar signal values (F420/F490). Zones 1 and 2 circled in white in the first picture indicate regions on the embryo's body where F420/F490 fluctuations were registered. These regions were the same for all inspected fish. (B and E) Changes in the NAD+/NADH ratio measured using the SoNar biosensor in the yolk sac (red line) and body (black line) of the D. rerio embryo before and after injections of lactate (B) and pyruvate (E) solutions. (C and F) Changes in pH registered using the SypHer2 in the yolk sac (red line) and body (black line) of a D. rerio embryo before and after injections of lactate (C) and pyruvate (F). For all graphs (B, C, E, F) the error bar corresponds to the standard deviation. Graph (C) was constructed based on the imaging of 10 fish. Graph (E) — based on the imaging of 11 fish. Graphs (C) and (F) — based on the imaging of 6 animals (per graph)
biosensor [33]. We synthesized SypHer2 mRNA and conducted the same series of experiments as with SoNar. Lactate and pyruvate injections did not induce any changes in pH in the embryos' bodies. Injected into the yolk sac, both metabolites caused a slight and slow increase in pH in this tissue which lasted for 20 min following the injection (Fig. 2, C, F).
DISCUSSION
Our findings lead us to conclude that the genetically encoded biosensor SoNar developed to record NAD+/NADH fluctuations can be successfully used in the experiments involving D. rerio model species. The NAD+/NADH ratio is an important biological parameter that can be significantly affected by pathology. A fish that expresses the SoNar biosensor in its tissues or cells can be effectively used as a model organism to assess the impact of different compounds on the NAD+/NADH ratio and therefore on disease progression.
We have found out that lactate injections in the yolk sac cause significant simultaneous reduction of the NAD pool in all tissues of the fish. However, pyruvate injections induce NAD oxidation only in the yolk sac; moreover, they cause slight reduction in the embryo's body. One of the recent works studied the role of redox processes in embryogenesis using the D. rerio model to reveal that massive oxidation starts at gastrulation and goes on to subside when the fish is three days old. That work demonstrates that oxidative stress plays a key role in the development of some organs in the course of embryogenesis
[26]. Perhaps, we have not observed significant oxidation in embryo tissues following the pyruvate injection because at this developmental stage redox homeostasis is shifted towards oxidation. Notably, in the article cited above the minimum level of reactive oxygen species (hydrogen peroxide) was observed in the yolk sac - the organ in which (in our experiment) NAD tended to be oxidized after the injection of pyruvate. Insignificant reduction of the NAD pool in the embryo's body is probably compensation.
Another possible explanation is that in the yolk sac pyruvate is reduced to lactate, which can be confirmed by decreased NADH concentrations, but it is mainly lactate that is transported to the embryo's body. Perhaps, this is why we observed a signal change indicative of a slight elevation of NADH concentrations. This hypothesis needs to be tested.
CONCLUSIONS
We have demonstrated that the genetically encoded biosensor SoNar developed to measure the NAD+/NADH ratio can be used in D. rerio tissues. Lactate injections into the yolk sac of a one-day old fish embryo lead to rapid reduction of the NAD pool in all tissues of the fish, showing that substances present in the yolk sac can be easily transported to other tissues. Pyruvate injections induce oxidative reactions in the yolk sac only, accompanied by slight reduction in the embryo's body. Using the control SypHer2, we have established that pyruvate and lactate cause slight pH fluctuations only in the yolk sac.
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Литература
1. Langenau DM, Traver D, Ferrando AA, Kutok JL, Aster JC, Kanki JP et al. Myc-induced T cell leukemia in transgenic zebrafish. Science. 2003 Feb 7; 299 (5608): 887-90. DOI: 10. 10.1126/science.1080280.
2. Chen J, Jette C, Kanki JP, Aster JC, Look AT, Griffin JD. NOTCH1-induced T-cell leukemia in transgenic zebrafish. Leukemia. 2007 11. Mar; 21 (3): 462-71. DOI: 10.1038/sj.leu.2404546.
3. Feng H, Stachura DL, White RM, Gutierrez A, Zhang L, Sanda T
et al. T-lymphoblastic lymphoma cells express high levels of 12. BCL2, S1P1, and ICAM1, leading to a blockade of tumor cell intravasation. Cancer Cell. 2010 Oct 19; 18 (4): 353-66. DOI: 10.1016/j.ccr.2010.09.009.
4. Patton EE, Widlund HR, Kutok JL, Kopani KR, Amatruda JF, 13. Murphey RD et al. BRAF mutations are sufficient to promote
nevi formation and cooperate with p53 in the genesis of melanoma. Curr Biol. 2005 Feb 8; 15 (3): 249-54. DOI: 10.1016/j. 14. cub.2005.01.031.
5. Santoriello C, Gennaro E, Anelli V, Distel M, Kelly A, Koster RW et
al. Kita driven expression of oncogenic HRAS leads to early onset 15. and highly penetrant melanoma in zebrafish. PloS One. 2010 Dec 10; 5 (12): e15170. DOI: 10.1371/journal.pone.0015170.
6. Bassett DI, Currie PD. The zebrafish as a model for muscular 16. dystrophy and congenital myopathy. Hum Mol Genet. 2003 Oct
15; 12 Spec No 2: R265-70. DOI: 10.1093/hmg/ddg279.
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