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Donato J, Kopchick JJ. New findings on brain actions of growth hormone and potential clinical implications. Rev Endocr Metab Disord 2024; 25:541-553. [PMID: 38060062 PMCID: PMC11156798 DOI: 10.1007/s11154-023-09861-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/29/2023] [Indexed: 12/08/2023]
Abstract
Growth hormone (GH) is secreted by somatotropic cells of the anterior pituitary gland. The classical effects of GH comprise the stimulation of cell proliferation, tissue and body growth, lipolysis, and insulin resistance. The GH receptor (GHR) is expressed in numerous brain regions. Notably, a growing body of evidence indicates that GH-induced GHR signaling in specific neuronal populations regulates multiple physiological functions, including energy balance, glucose homeostasis, stress response, behavior, and several neurological/cognitive aspects. The importance of central GHR signaling is particularly evident when the organism is under metabolic stress, such as pregnancy, chronic food deprivation, hypoglycemia, and prolonged exercise. These particular situations are associated with elevated GH secretion. Thus, central GH action represents an internal signal that coordinates metabolic, neurological, neuroendocrine, and behavioral adaptations that are evolutionarily advantageous to increase the chances of survival. This review summarizes and discusses recent findings indicating that the brain is an important target of GH, and GHR signaling in different neuronal populations regulates essential physiological functions.
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Affiliation(s)
- Jose Donato
- Department of Physiology and Biophysics, Instituto de Ciencias Biomedicas, Universidade de Sao Paulo, Lineu Prestes, 1524, Sao Paulo, SP, 05508-000, Brazil.
| | - John J Kopchick
- Edison Biotechnology Institute and Heritage College of Osteopathic Medicine, Ohio University, Athens, OH, 45701, USA
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Mansano NDS, Vieira HR, Araujo-Lopes R, Szawka RE, Donato J, Frazao R. Fasting Modulates GABAergic Synaptic Transmission to Arcuate Kisspeptin Neurons in Female Mice. Endocrinology 2023; 164:bqad150. [PMID: 37793082 DOI: 10.1210/endocr/bqad150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 09/28/2023] [Accepted: 10/02/2023] [Indexed: 10/06/2023]
Abstract
It is well-established that the hypothalamic-pituitary-gonadal (HPG) axis is suppressed due to negative energy balance. However, less information is available on whether kisspeptin neuronal activity contributes to fasting-induced responses. In the present study, female and male mice were fasted for 24 hours or provided food ad libitum (fed group) to determine whether acute fasting is sufficient to modulate kisspeptin neuronal activity. In female mice, fasting attenuated luteinizing hormone (LH) and prolactin (PRL) serum levels and increased follicle-stimulating hormone levels compared with the fed group. In contrast, fasting did not affect gonadotropin or PRL secretion in male mice. By measuring genes related to LH pulse generation in micropunches obtained from the arcuate nucleus of the hypothalamus (ARH), we observed that fasting reduced Kiss1 mRNA levels in female and male mice. In contrast, Pdyn expression was upregulated only in fasted female mice, whereas no changes in the Tac2 mRNA levels were observed in both sexes. Interestingly, the frequency and amplitude of the GABAergic postsynaptic currents recorded from ARH kisspeptin neurons (ARHKisspeptin) were reduced in 24-hour fasted female mice but not in males. Additionally, neuropeptide Y induced a hyperpolarization in the resting membrane potential of ARHKisspeptin neurons of fed female mice but not in males. Thus, the response of ARHKisspeptin neurons to fasting is sexually dependent with a female bias, associated with changes in gonadotropins and PRL secretion. Our findings suggest that GABAergic transmission to ARHKisspeptin neurons modulates the activity of the HPG axis during situations of negative energy balance.
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Affiliation(s)
- Naira da Silva Mansano
- Universidade de Sao Paulo, Instituto de Ciencias Biomedicas, Departamento de Anatomia, São Paulo, SP 05508-000, Brazil
| | - Henrique Rodrigues Vieira
- Universidade de Sao Paulo, Instituto de Ciencias Biomedicas, Departamento de Anatomia, São Paulo, SP 05508-000, Brazil
| | - Roberta Araujo-Lopes
- Universidade Federal de Minas Gerais, Departamento de Fisiologia e Biofisica, Instituto de Ciencias Biologicas, Belo Horizonte, MG 31270-901, Brazil
| | - Raphael Escorsim Szawka
- Universidade Federal de Minas Gerais, Departamento de Fisiologia e Biofisica, Instituto de Ciencias Biologicas, Belo Horizonte, MG 31270-901, Brazil
| | - Jose Donato
- Universidade de Sao Paulo, Instituto de Ciencias Biomedicas, Departamento de Fisiologia e Biofísica, São Paulo, SP 05508-000, Brazil
| | - Renata Frazao
- Universidade de Sao Paulo, Instituto de Ciencias Biomedicas, Departamento de Anatomia, São Paulo, SP 05508-000, Brazil
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Zimerman J, Niño OMS, da Costa CS, Zanol JF, Comério M, da Gama de Souza LN, Miranda-Alves L, Miranda RA, Lisboa PC, Camilo TA, Rorato R, Alves GA, Frazão R, Zomer HD, Freitas-Lima LC, Graceli JB. Subacute high-refined carbohydrate diet leads to abnormal reproductive control of the hypothalamic-pituitary axis in female rats. Reprod Toxicol 2023; 119:108410. [PMID: 37211340 DOI: 10.1016/j.reprotox.2023.108410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2023] [Revised: 05/05/2023] [Accepted: 05/18/2023] [Indexed: 05/23/2023]
Abstract
We previously reported that female rats placed on a diet containing refined carbohydrates (HCD) resulted in obesity and reproductive abnormalities, such as high serum LH concentration and abnormal ovarian function. However, the impacts at the hypothalamic-pituitary (HP) function, specifically regarding pathways linked to reproductive axis modulation are unknown. In this study, we assessed whether subacute feeding with HCD results in abnormal reproductive control in the HP axis. Female rats were fed with HCD for 15 days and reproductive HP axis morphophysiology was assessed. HCD reduced hypothalamic mRNA expression (Kiss1, Lepr, and Amhr2) and increased pituitary LHβ+ cells. These changes likely contribute to the increase in serum LH concentration observed in HCD. Blunted estrogen negative feedback was observed in HCD, with increased kisspeptin protein expression in the arcuate nucleus of the hypothalamus (ARH), lower LHβ+ cells and LH concentration in ovariectomized (OVX)+HCD rats. Thus, these data suggest that HCD feeding led to female abnormal reproductive control of HP axis.
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Affiliation(s)
- Jeanini Zimerman
- Department of Morphology, Federal University of Espírito Santo, Vitória, Brazil
| | - Oscar M S Niño
- Department of Morphology, Federal University of Espírito Santo, Vitória, Brazil; Faculty of Human Sciences and Education, Universidad de los Llanos, Villavicencio, Meta, Colombia
| | - Charles S da Costa
- Department of Morphology, Federal University of Espírito Santo, Vitória, Brazil
| | - Jordana F Zanol
- Department of Morphology, Federal University of Espírito Santo, Vitória, Brazil
| | - Milena Comério
- Department of Morphology, Federal University of Espírito Santo, Vitória, Brazil
| | | | - Leandro Miranda-Alves
- Experimental Endocrinology Research, Development and Innovation Group, Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Brazil; Postgraduate Program in Endocrinology, School of Medicine, Federal University of Rio de Janeiro, Av. Carlos Chagas Filho, Ilha do Governador, Cidade Universitária, UFRJ, RJ, Brazil
| | - Rosiane A Miranda
- Laboratory of Endocrine Physiology, Biology Institute, State University of Rio de Janeiro, RJ, Brazil
| | - Patrícia C Lisboa
- Laboratory of Endocrine Physiology, Biology Institute, State University of Rio de Janeiro, RJ, Brazil
| | - Tays A Camilo
- Department of Biophysics, Paulista School of Medicine, Federal University of São Paulo, São Paulo, Brazil
| | - Rodrigo Rorato
- Department of Biophysics, Paulista School of Medicine, Federal University of São Paulo, São Paulo, Brazil
| | - Guilherme Andrade Alves
- Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Renata Frazão
- Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Helena D Zomer
- Department of Physiological Sciences, University of Florida, Gainesville, FL, USA
| | | | - Jones B Graceli
- Department of Morphology, Federal University of Espírito Santo, Vitória, Brazil.
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Wasinski F, Tavares MR, Gusmao DO, List EO, Kopchick JJ, Alves GA, Frazao R, Donato J. Central growth hormone action regulates neuroglial and proinflammatory markers in the hypothalamus of male mice. Neurosci Lett 2023; 806:137236. [PMID: 37030549 PMCID: PMC10133206 DOI: 10.1016/j.neulet.2023.137236] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 04/03/2023] [Accepted: 04/04/2023] [Indexed: 04/10/2023]
Abstract
Growth hormone (GH) action in specific neuronal populations regulates neuroendocrine responses, metabolism, and behavior. However, the potential role of central GH action on glial function is less understood. The present study aims to determine how the hypothalamic expression of several neuroglial markers is affected by central GH action in male mice. The dwarf GH- and insulin-like growth factor-1 (IGF-1)-deficient Ghrhrlit/lit mice showed decreased mRNA expression of Nes (Nestin), Gfap, Iba1, Adgre1 (F4/80), and Tnf (TNFα) in the hypothalamus, compared to wild-type animals. In contrast, transgenic overexpression of GH led to high serum GH and IGF-1 levels, and increased hypothalamic expression of Nes, Gfap, Adgre1, Iba1, and Rax. Hepatocyte-specific GH receptor (GHR) knockout mice, which are characterized by high serum GH levels, but reduced IGF-1 secretion, showed increased mRNA expression of Gfap, Iba1, Tnf, and Sox10, demonstrating that the increase in GH levels alters the hypothalamic expression of glial markers associated with neuroinflammation, independently of IGF-1. Conversely, brain-specific GHR knockout mice showed reduced expression of Gfap, Adgre1, and Vim (vimentin), indicating that brain GHR signaling is necessary to mediate GH-induced changes in the expression of several neuroglial markers. In conclusion, the hypothalamic mRNA levels of several neuroglial markers associated with inflammation are directly modulated by GHR signaling in male mice.
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Affiliation(s)
- Frederick Wasinski
- Department of Neurology and Neurosurgery, Universidade Federal de Sao Paulo, Sao Paulo, SP 04039-032, Brazil
| | - Mariana R Tavares
- Department of Physiology and Biophysics, Instituto de Ciencias Biomedicas, Universidade de Sao Paulo, Sao Paulo, SP 05508-000, Brazil
| | - Daniela O Gusmao
- Department of Physiology and Biophysics, Instituto de Ciencias Biomedicas, Universidade de Sao Paulo, Sao Paulo, SP 05508-000, Brazil
| | - Edward O List
- Edison Biotechnology Institute and Heritage College of Osteopathic Medicine, Ohio University, Athens, OH 45701, USA
| | - John J Kopchick
- Edison Biotechnology Institute and Heritage College of Osteopathic Medicine, Ohio University, Athens, OH 45701, USA
| | - Guilherme A Alves
- Department of Anatomy, Instituto de Ciencias Biomedicas, Universidade de Sao Paulo, Sao Paulo, SP 05508-900, Brazil
| | - Renata Frazao
- Department of Anatomy, Instituto de Ciencias Biomedicas, Universidade de Sao Paulo, Sao Paulo, SP 05508-900, Brazil
| | - Jose Donato
- Department of Physiology and Biophysics, Instituto de Ciencias Biomedicas, Universidade de Sao Paulo, Sao Paulo, SP 05508-000, Brazil.
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An Early and Sustained Inflammatory State Induces Muscle Changes and Establishes Obesogenic Characteristics in Wistar Rats Exposed to the MSG-Induced Obesity Model. Int J Mol Sci 2023; 24:ijms24054730. [PMID: 36902158 PMCID: PMC10003260 DOI: 10.3390/ijms24054730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 12/23/2022] [Accepted: 12/26/2022] [Indexed: 03/05/2023] Open
Abstract
The model of obesity induced by monosodium glutamate cytotoxicity on the hypothalamic nuclei is widely used in the literature. However, MSG promotes persistent muscle changes and there is a significant lack of studies that seek to elucidate the mechanisms by which damage refractory to reversal is established. This study aimed to investigate the early and chronic effects of MSG induction of obesity upon systemic and muscular parameters of Wistar rats. The animals were exposed to MSG subcutaneously (4 mg·g-1 b.w.) or saline (1.25 mg·g-1 b.w.) daily from PND01 to PND05 (n = 24). Afterwards, in PND15, 12 animals were euthanized to determine the plasma and inflammatory profile and to assess muscle damage. In PND142, the remaining animals were euthanized, and samples for histological and biochemical analyses were obtained. Our results suggest that early exposure to MSG reduced growth, increased adiposity, and inducted hyperinsulinemia and a pro-inflammatory scenario. In adulthood, the following were observed: peripheral insulin resistance, increased fibrosis, oxidative distress, and a reduction in muscle mass, oxidative capacity, and neuromuscular junctions, increased fibrosis, and oxidative distress. Thus, we can conclude that the condition found in adult life and the difficulty restoring in the muscle profile is related to the metabolic damage established early on.
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Gusmao DO, Vieira HR, Mansano NS, Tavares M, de Sousa LMM, Wasinski F, Frazao R, Donato J. Pattern of gonadotropin secretion along the estrous cycle of C57BL/6 female mice. Physiol Rep 2022; 10:e15460. [PMID: 36065891 PMCID: PMC9446398 DOI: 10.14814/phy2.15460] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Accepted: 08/22/2022] [Indexed: 06/15/2023] Open
Abstract
The pattern of gonadotropin secretion along the estrous cycle was elegantly described in rats. Less information exists about the pattern of gonadotropin secretion in gonad-intact mice, particularly regarding the follicle-stimulating hormone (FSH). Using serial blood collections from the tail-tip of gonad-intact C57BL/6 mice on the first day of cornification (transition from diestrus to estrus; hereafter called proestrus), we observed that the luteinizing hormone (LH) and FSH surge cannot be consistently detected since only one out of eight females (12%) showed increased LH levels. In contrast, a high percentage of mice (15 out of 21 animals; 71%) exhibited LH and FSH surges on the proestrus when a single serum sample was collected. Mice that exhibited LH and FSH surges on the proestrus showed c-Fos expression in gonadotropin-releasing hormone- (GnRH; 83.4% of co-localization) and kisspeptin-expressing neurons (42.3% of co-localization) of the anteroventral periventricular nucleus (AVPV). Noteworthy, mice perfused on proestrus, but that failed to exhibit LH surge, showed a smaller, but significant expression of c-Fos in GnRH (32.7%) and AVPVKisspeptin (14.0%) neurons. Finally, 96 serial blood samples were collected hourly in eight regular cycling C57BL/6 females to describe the pattern of LH and FSH secretion along the estrous cycle. Small elevations in LH and FSH levels were detected at the time expected for the LH surge. In summary, the present study improves our understanding of the pattern of gonadotropin secretion and the activation of central components of the hypothalamic-pituitary-gonadal axis along the estrous cycle of C57BL/6 female mice.
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Affiliation(s)
- Daniela O. Gusmao
- Department of Physiology and BiophysicsInstituto de Ciencias Biomedicas, Universidade de Sao PauloSao PauloBrazil
| | - Henrique R. Vieira
- Department of AnatomyInstituto de Ciencias Biomedicas, Universidade de Sao PauloSao PauloBrazil
| | - Naira S. Mansano
- Department of AnatomyInstituto de Ciencias Biomedicas, Universidade de Sao PauloSao PauloBrazil
| | - Mariana R. Tavares
- Department of Physiology and BiophysicsInstituto de Ciencias Biomedicas, Universidade de Sao PauloSao PauloBrazil
| | - Ligia M. M. de Sousa
- Department of Physiology and BiophysicsInstituto de Ciencias Biomedicas, Universidade de Sao PauloSao PauloBrazil
| | - Frederick Wasinski
- Department of Physiology and BiophysicsInstituto de Ciencias Biomedicas, Universidade de Sao PauloSao PauloBrazil
| | - Renata Frazao
- Department of AnatomyInstituto de Ciencias Biomedicas, Universidade de Sao PauloSao PauloBrazil
| | - Jose Donato
- Department of Physiology and BiophysicsInstituto de Ciencias Biomedicas, Universidade de Sao PauloSao PauloBrazil
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Socs3 ablation in kisspeptin cells partially prevents lipopolysaccharide-induced body weight loss. Cytokine 2022; 158:155999. [PMID: 35985175 DOI: 10.1016/j.cyto.2022.155999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 07/25/2022] [Accepted: 08/02/2022] [Indexed: 11/22/2022]
Abstract
Many cytokines have been proposed to regulate reproduction due to their actions on hypothalamic kisspeptin cells, the main modulators of gonadotropin-releasing hormone (GnRH) neurons. Hormones such as leptin, prolactin and growth hormone are good examples of cytokines that lead to Janus kinase/signal transducer and activator of transcription (JAK/STAT) pathway activation, consequently exerting effects in kisspeptin neurons. Different studies have investigated how specific components of the JAK/STAT signaling pathway affect the functions of kisspeptin cells, but the role of the suppressor of cytokine signaling 3 (SOCS3) in mediating cytokine actions in kisspeptin cells remains unknown. Cre-Loxp technology was used in the present study to ablate Socs3 expression in kisspeptin cells (Kiss1/Socs3-KO). Then, male and female control and Kiss1/Socs3-KO mice were evaluated for sexual maturation, energy homeostasis features, and fertility. It was found that hypothalamic Kiss1 mRNA expression is significantly downregulated in Kiss1/Socs3-KO mice. Despite reduced hypothalamic Kiss1 mRNA content, these mice did not present any sexual maturation or fertility impairments. Additionally, body weight gain, leptin sensitivity and glucose homeostasis were similar to control mice. Interestingly, Kiss1/Socs3-KO mice were partially protected against lipopolysaccharide (LPS)-induced body weight loss. Our results suggest that Socs3 ablation in kisspeptin cells partially prevents the sickness behavior induced by LPS, suggesting that kisspeptin cells can modulate energy metabolism in mice in certain situations.
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Göcz B, Takács S, Skrapits K, Rumpler É, Solymosi N, Póliska S, Colledge WH, Hrabovszky E, Sárvári M. Estrogen differentially regulates transcriptional landscapes of preoptic and arcuate kisspeptin neuron populations. Front Endocrinol (Lausanne) 2022; 13:960769. [PMID: 36093104 PMCID: PMC9454256 DOI: 10.3389/fendo.2022.960769] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 07/28/2022] [Indexed: 11/17/2022] Open
Abstract
Kisspeptin neurons residing in the rostral periventricular area of the third ventricle (KPRP3V) and the arcuate nucleus (KPARC) mediate positive and negative estrogen feedback, respectively. Here, we aim to compare transcriptional responses of KPRP3V and KPARC neurons to estrogen. Transgenic mice were ovariectomized and supplemented with either 17β-estradiol (E2) or vehicle. Fluorescently tagged KPRP3V neurons collected by laser-capture microdissection were subjected to RNA-seq. Bioinformatics identified 222 E2-dependent genes. Four genes encoding neuropeptide precursors (Nmb, Kiss1, Nts, Penk) were robustly, and Cartpt was subsignificantly upregulated, suggesting putative contribution of multiple neuropeptides to estrogen feedback mechanisms. Using overrepresentation analysis, the most affected KEGG pathways were neuroactive ligand-receptor interaction and dopaminergic synapse. Next, we re-analyzed our previously obtained KPARC neuron RNA-seq data from the same animals using identical bioinformatic criteria. The identified 1583 E2-induced changes included suppression of many neuropeptide precursors, granins, protein processing enzymes, and other genes related to the secretory pathway. In addition to distinct regulatory responses, KPRP3V and KPARC neurons exhibited sixty-two common changes in genes encoding three hormone receptors (Ghsr, Pgr, Npr2), GAD-65 (Gad2), calmodulin and its regulator (Calm1, Pcp4), among others. Thirty-four oppositely regulated genes (Kiss1, Vgf, Chrna7, Tmem35a) were also identified. The strikingly different transcriptional responses in the two neuron populations prompted us to explore the transcriptional mechanism further. We identified ten E2-dependent transcription factors in KPRP3V and seventy in KPARC neurons. While none of the ten transcription factors interacted with estrogen receptor-α, eight of the seventy did. We propose that an intricate, multi-layered transcriptional mechanism exists in KPARC neurons and a less complex one in KPRP3V neurons. These results shed new light on the complexity of estrogen-dependent regulatory mechanisms acting in the two functionally distinct kisspeptin neuron populations and implicate additional neuropeptides and mechanisms in estrogen feedback.
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Affiliation(s)
- Balázs Göcz
- Laboratory of Reproductive Neurobiology, Institute of Experimental Medicine, Budapest, Hungary
- János Szentágothai Doctoral School of Neurosciences, Semmelweis University, Budapest, Hungary
- *Correspondence: Erik Hrabovszky, ; Miklós Sárvári, ; Balázs Göcz,
| | - Szabolcs Takács
- Laboratory of Reproductive Neurobiology, Institute of Experimental Medicine, Budapest, Hungary
| | - Katalin Skrapits
- Laboratory of Reproductive Neurobiology, Institute of Experimental Medicine, Budapest, Hungary
| | - Éva Rumpler
- Laboratory of Reproductive Neurobiology, Institute of Experimental Medicine, Budapest, Hungary
| | - Norbert Solymosi
- Centre for Bioinformatics, University of Veterinary Medicine, Budapest, Hungary
| | - Szilárd Póliska
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - William H. Colledge
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, United Kingdom
| | - Erik Hrabovszky
- Laboratory of Reproductive Neurobiology, Institute of Experimental Medicine, Budapest, Hungary
- *Correspondence: Erik Hrabovszky, ; Miklós Sárvári, ; Balázs Göcz,
| | - Miklós Sárvári
- Laboratory of Reproductive Neurobiology, Institute of Experimental Medicine, Budapest, Hungary
- *Correspondence: Erik Hrabovszky, ; Miklós Sárvári, ; Balázs Göcz,
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