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Bugiel-Stabla K, Agnoli C, Pawlak A. Estrogen receptors alpha and beta expression in different canine cancer types with an emphasis on hematopoietic malignancies. Vet Res Commun 2024:10.1007/s11259-024-10368-2. [PMID: 38594602 DOI: 10.1007/s11259-024-10368-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 03/26/2024] [Indexed: 04/11/2024]
Abstract
Estrogen receptors (ERs) are located in both healthy and neoplastic tissues. The type of estrogen receptor expressed varies depending on its location, tumor type, and species. Estrogen action is mediated by binding to ER and activating the transcriptional and signaling processes that result in the control of gene expression. There are two main types of estrogen receptors: ER alpha (ERα) and ER beta (ERβ). Both receptors are functionally different, they may act antagonistically and are distributed in different tissues but their structure is similar - as they are composed of 5 different domains: A/B, C, D, E, and F. The signaling pathway and hence regulation of the gene expression by ERs is a complex and multifactorial process that involves both genomic and nongenomic actions. In the human reproductive tract, both ERα and β are present, with predominant expression of ERβ, while there are no satisfactory data distinguishing the type of ERs expressed in the canine reproductive tract. In mammary gland neoplasia, a decreased or lacking ERα expression in humans is associated with a poorer prognosis. This is similar to dogs, where higher ERα expression intensity was noted in benign tumors than in carcinomas. In human hematopoietic malignancies, ERβ is a predominant receptor. Selective and non-selective ERβ agonists have an antiproliferative and pro-apoptotic effect on human lymphoma cell lines and may be effective in the therapy of ERβ positive lymphomas and leukemias. In canine lymphoma tissues, none or only marginal expression of ERs was detected over the decades. Considering available data, we conducted preliminary studies proving that, in contrast to humans, the dominant ER expressed in canine hematopoietic tumors is ERα.
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Affiliation(s)
- Katarzyna Bugiel-Stabla
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Wroclaw University of Environmental and Life Sciences, Wrocław, Poland.
| | - Chiara Agnoli
- Department of Veterinary Medical Sciences, University of Bologna, Bologna, Italy
| | - Aleksandra Pawlak
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Wroclaw University of Environmental and Life Sciences, Wrocław, Poland
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Liguori G, Tafuri S, Pelagalli A, Ali’ S, Russo M, Mirabella N, Squillacioti C. G Protein-Coupled Estrogen Receptor (GPER) and ERs Are Modulated in the Testis-Epididymal Complex in the Normal and Cryptorchid Dog. Vet Sci 2024; 11:21. [PMID: 38250927 PMCID: PMC10820011 DOI: 10.3390/vetsci11010021] [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: 11/09/2023] [Revised: 12/17/2023] [Accepted: 12/22/2023] [Indexed: 01/23/2024] Open
Abstract
There is growing evidence by the literature that the unbalance between androgens and estrogens is a relevant condition associated with a common canine reproductive disorder known as cryptorchidism. The role of estrogens in regulating testicular cell function and reproductive events is supposedly due to the wide expression of two nuclear estrogen receptors (ERs), ER-alpha and ER-beta and a trans-membrane G protein-coupled estrogen receptor (GPER) in the testis. In this study, immunohistochemistry, Western blotting and qRT-PCR were used to assess the distribution and expression of GPER in the testis-epididymal complex in the normal and cryptorchid dog. ER-alpha and ER-beta were also evaluated to better characterize the relative abundances of all three receptors. In addition, in these tissues, the expression level of two proteins as SOD1 and Nrf2 normally associated with oxidative stress was investigated to evaluate a possible relationship with ERs. Our data revealed changes in the distribution and expression of the GPER between the normal and cryptorchid dog. In particular, dogs affected by cryptorchidism showed an upregulation of GPER at level of the examined reproductive tract. Also considering the obtained result of a modulation of SOD1 and Nrf2 expression, we could hypothesize the involvement of GPER in the cryptorchid condition. Further studies are, however, necessary to characterize the role of GPER and its specific signaling mechanisms.
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Affiliation(s)
- Giovanna Liguori
- Department of Veterinary Medicine and Animal Production, University of Napoli Federico II, 80137 Naples, Italy; (G.L.); (S.T.); (S.A.); (M.R.); (N.M.); (C.S.)
- Department of Prevention, ASL FG, Piazza Pavoncelli 11, 71121 Foggia, Italy
| | - Simona Tafuri
- Department of Veterinary Medicine and Animal Production, University of Napoli Federico II, 80137 Naples, Italy; (G.L.); (S.T.); (S.A.); (M.R.); (N.M.); (C.S.)
| | - Alessandra Pelagalli
- Department of Advanced Biomedical Sciences, University of Napoli Federico II, 80137 Naples, Italy
- Institute of Biostructures and Bioimages, National Research Council, Via De Amicis 95, 80131 Naples, Italy
| | - Sabrina Ali’
- Department of Veterinary Medicine and Animal Production, University of Napoli Federico II, 80137 Naples, Italy; (G.L.); (S.T.); (S.A.); (M.R.); (N.M.); (C.S.)
| | - Marco Russo
- Department of Veterinary Medicine and Animal Production, University of Napoli Federico II, 80137 Naples, Italy; (G.L.); (S.T.); (S.A.); (M.R.); (N.M.); (C.S.)
| | - Nicola Mirabella
- Department of Veterinary Medicine and Animal Production, University of Napoli Federico II, 80137 Naples, Italy; (G.L.); (S.T.); (S.A.); (M.R.); (N.M.); (C.S.)
| | - Caterina Squillacioti
- Department of Veterinary Medicine and Animal Production, University of Napoli Federico II, 80137 Naples, Italy; (G.L.); (S.T.); (S.A.); (M.R.); (N.M.); (C.S.)
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3
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Pizzi G, Groppetti D, Brambilla E, Pecile A, Grieco V, Lecchi C. MicroRNA as epigenetic regulators of canine cryptorchidism. Res Vet Sci 2023; 162:104961. [PMID: 37487386 DOI: 10.1016/j.rvsc.2023.104961] [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: 08/29/2022] [Revised: 06/26/2023] [Accepted: 07/11/2023] [Indexed: 07/26/2023]
Abstract
Cryptorchidism, the failed descent of one or both testes into the scrotum, is a common developmental disorder in male dogs. Cryptorchidism may affect canine fertility, reducing the quality of the semen, and may promote spermatic cord torsion and onset of neoplasia. MicroRNAs (miRNAs) are epigenetic regulators of gene expression and their dysregulation is associated with disorders of spermatogenesis and testis neoplasia. The present study aimed at investigating the expression of miRNAs in formalin-fixed, paraffin-embedded (FFPE) canine retained testes and testes affected by seminoma, and at integrating miRNAs to their target genes. Forty testicular FFPE specimens from 30 dogs were included - 10 scrotal and 10 contralateral retained from 10 unilateral cryptorchid dogs; 10 tumoral testes affected by seminoma from non-cryptorchid dogs; 10 scrotal normal testes from non-cryptorchid dogs included as the control. The expression level of three miRNAs, namely miR-302c-3p, miR-302a-3p, and miR-371-3p, associated with testicular disorders, were quantified using RT-qPCR. The comparative analysis demonstrated that the level of miR-302a-3p and miR-371a-3p were quantifiable exclusively in control testes. The expression level of miR-302c-3p was higher in the control than in the other groups; its expression decreased in retained testes compared to scrotal testes and testes with seminoma. Gene Ontology analysis pointed out that these miRNAs may be involved in the modulation of estrogen and thyroid hormone signaling pathways. In conclusion, this study demonstrated that miRNAs are dysregulated in canine cryptorchid and seminoma-affected testes compared to control tissues, confirming the pivotal role of miRNAs in cryptorchidism.
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Affiliation(s)
- Giulia Pizzi
- Università degli Studi di Milano, Lodi 26900, Italy
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Attard S, Muscatello LV, Mazzullo G, Pisu MC. Penile Varicose Vein in Akita inu, 7-Year-Old Dog: A Clinico-Pathological Study. Vet Sci 2022; 9:vetsci9020047. [PMID: 35202300 PMCID: PMC8874526 DOI: 10.3390/vetsci9020047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Revised: 01/16/2022] [Accepted: 01/24/2022] [Indexed: 02/04/2023] Open
Abstract
Penile varicose veins are a rare lesion described in human medicine. A seven-year-old intact Akita inu male dog presented with a red penile neoformation. It was further referred for a specialist andrological examination. During the visit, ultrasonography of genital apparatus and cytology of the penile lesion were performed. A suspected neoformation of vascular origin was observed on ultrasonography. Cytology was inconclusive as composition of the sample revealed blood elements only. The neoformation was surgically removed and the excised sample was submitted for the histological examination, which revealed an anomalous varicose dilatation of the venous vascular structures. In human medicine, varicose veins are part of the spectrum of chronic venous disease and include spider telangiectasia, reticular veins, and true varicosities. Reports of penile localization of varicose veins is rare in human medicine and, to the best of our knowledge, it has never been reported in veterinary medicine.
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Affiliation(s)
- Simona Attard
- VRC—Centro di Referenza Veterinario, 10138 Torino, Italy;
| | - Luisa Vera Muscatello
- Department of Veterinary Medical Sciences, University of Bologna, 40064 Ozzano dell’Emilia, Italy;
- MyLav La Vallonea, Laboratorio di Analisi Veterinarie, 20017 Milan, Italy
| | - Giuseppe Mazzullo
- Department of Veterinary Sciences, University of Messina, 98168 Messina, Italy;
| | - Maria Carmela Pisu
- VRC—Centro di Referenza Veterinario, 10138 Torino, Italy;
- Correspondence: ; Tel.: +39-34713-34713
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Galuszka A, Pawlicki P, Pardyak L, Chmurska-Gąsowska M, Pietsch-Fulbiszewska A, Duliban M, Turek W, Dubniewicz K, Ramisz G, Kotula-Balak M. Abundance of estrogen receptors involved in non-canonical signaling in the dog testis. Anim Reprod Sci 2021; 235:106888. [PMID: 34839117 DOI: 10.1016/j.anireprosci.2021.106888] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 11/02/2021] [Accepted: 11/03/2021] [Indexed: 11/28/2022]
Abstract
With estrogen regulation of the reproductive system, G-protein-coupled membrane estrogen receptor (GPER) and estrogen-related receptors (ERRs) are implicated. Non-canonical receptors can bind estrogens such as environmental and pharmacological chemicals. These compounds induce rapid non-genomic pathways or receptor interaction including autoactivation. Testicular tumors occur in dogs more frequently than in other domestic animals. Also, in recent decades there were increased occurrences of various tumor types in dogs. Using qRT-PCR, Western blot and immunohistochemistry procedures in the present study, there was determination of abundance pattern of GPER, ERRα, β and γ in dog tests when there were intratubular germ cell tumors. There was quantitation of estradiol, cyclic GMP and calcium ions (Ca2+). There were changes (P < 0.01; P < 0.001) in GPER, ERRα and β in both mRNA transcript and protein abundances including less (P < 0.001) co-abundance of ERRγ mRNA transcript and protein. Receptors were mainly located in Leydig cells with there being receptor delocalization to the cell cytoplasm or occasionally detections in the seminiferous tubule epithelia, especially of testicular tumor tissues. There were also greater estradiol (P < 0.05) and lesser cGMP and Ca2+ concentrations in testicular tumor tissues indicating there was a disrupted sex steroid milieu and tumor cell metastasis. Results from the present study provide further evidence that ERRγ has marked actions in testicular germ cell tumor initiation and development and in further structural-functional disruptions of dog testis. Concomitantly, abundance pattern of GPER and ERRs, relative to concentrations of cGMP and Ca2+, may be an additional indicator of intratubular germ cell tumors in dogs.
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Affiliation(s)
- Anna Galuszka
- University Centre of Veterinary Medicine JU-UA, University of Agriculture in Krakow, Mickiewicza 24/28, 30-059 Krakow, Poland
| | - Piotr Pawlicki
- Center of Experimental and Innovative Medicine, University of Agriculture in Krakow, Redzina 1c, 30-248 Krakow, Poland
| | - Laura Pardyak
- Center of Experimental and Innovative Medicine, University of Agriculture in Krakow, Redzina 1c, 30-248 Krakow, Poland
| | - Maria Chmurska-Gąsowska
- University Centre of Veterinary Medicine JU-UA, University of Agriculture in Krakow, Mickiewicza 24/28, 30-059 Krakow, Poland
| | - Agnieszka Pietsch-Fulbiszewska
- University Centre of Veterinary Medicine JU-UA, University of Agriculture in Krakow, Mickiewicza 24/28, 30-059 Krakow, Poland
| | - Michal Duliban
- Department of Endocrinology, Institute of Zoology and Biomedical Research, Jagiellonian University in Krakow, Gronostajowa 9, 30-387 Krakow, Poland
| | - Wiktor Turek
- University Centre of Veterinary Medicine JU-UA, University of Agriculture in Krakow, Mickiewicza 24/28, 30-059 Krakow, Poland
| | - Klaudia Dubniewicz
- University Centre of Veterinary Medicine JU-UA, University of Agriculture in Krakow, Mickiewicza 24/28, 30-059 Krakow, Poland
| | - Grzegorz Ramisz
- University Centre of Veterinary Medicine JU-UA, University of Agriculture in Krakow, Mickiewicza 24/28, 30-059 Krakow, Poland
| | - Malgorzata Kotula-Balak
- University Centre of Veterinary Medicine JU-UA, University of Agriculture in Krakow, Mickiewicza 24/28, 30-059 Krakow, Poland.
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The G-Protein-Coupled Membrane Estrogen Receptor Is Present in Horse Cryptorchid Testes and Mediates Downstream Pathways. Int J Mol Sci 2021; 22:ijms22137131. [PMID: 34281183 PMCID: PMC8269005 DOI: 10.3390/ijms22137131] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 06/22/2021] [Accepted: 06/29/2021] [Indexed: 12/18/2022] Open
Abstract
Cryptorchidism in horses is a commonly occurring malformation. The molecular basis of this pathology is not fully known. In addition, the origins of high intratesticular estrogen levels in horses remain obscure. In order to investigate the role of the G-protein-coupled membrane estrogen receptor (GPER) and establish histological and biochemical cryptorchid testis status, healthy and cryptorchid horse testes were subjected to scanning electron microscopy analysis, histochemical staining for total protein (with naphthol blue black; NBB), acid content (with toluidine blue O; TBO), and polysaccharide content (with periodic acid-Schiff; PAS). The expression of GPER was analyzed by immunohistochemistry and Western blot. GPER-mediated intracellular cAMP and calcium (Ca2+) signaling were measured immunoenzymatically or colorimetrically. Our data revealed changes in the distribution of polysaccharide content but not the protein and acid content in the cryptorchid testis. Polysaccharides seemed to be partially translocated from the interstitial compartment to the seminiferous tubule compartment. Moreover, the markedly decreased expression of GPER and GPER downstream molecules, cAMP and Ca2+, suggests their potential role in testis pathology. Increased estrogen levels in cryptorchid conditions may be linked to disturbed GPER signaling. We postulate that GPER is a prominent key player in testis development and function and may be used as a new biomarker of horse testis in health and disease.
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Krzeminska P, Stachowiak M, Skrzypski M, Nowak T, Maslak A, Switonski M. Altered expression of CYP17A1 and CYP19A1 in undescended testes of dogs with unilateral cryptorchidism. Anim Genet 2020; 51:763-771. [PMID: 32657440 DOI: 10.1111/age.12977] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 04/20/2020] [Accepted: 06/15/2020] [Indexed: 12/14/2022]
Abstract
Cryptorchidism is the most common disorder of sex development in dogs and testosterone plays a crucial role in the inguinal phase of the testes descending into the scrotum. The molecular background of impaired testosterone synthesis in the testes of cryptorchid dogs is poorly elucidated. In this study, we analyzed the expression of four genes involved in testicular steroidogenesis (CYP17A1, CYP19A1, HSD3B2 and HSD17B3) in undescended and contralateral scrotal testes from inguinal unilateral cryptorchid dogs (n = 13) and from the scrotal gonads of normal males (n = 15). We found that transcript level of CYP17A1 was significantly increased in inguinal gonads, while the level of CYP19A1 was decreased. For these two genes, we analyzed the methylation level of single CpG sites in the promoter region localized within putative target sites for testicular transcription factors (NUR77, CREB, CAR and HSF2). A correlation between decreased methylation in the promoter of CYP17A1 and its increased transcript level in undescended gonads was observed, but the change in protein level was not significant. We also resequenced the 5'-flanking region of both genes and two known polymorphic sites, SNP in CYP17A1 and an indel in CYP19A1, were found. However, the distribution of the variants in affected (n = 80) and control (n = 75) dogs was not associated with cryptorchidism. We tentatively conclude that the altered expression of CYP17A1 and CYP19A1 in undescended testes could be caused by their exposure to increased temperature in the body. Furthermore, we showed that the identified polymorphisms cannot be considered markers associated with a predisposition to cryptorchidism.
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Affiliation(s)
- P Krzeminska
- Department of Genetics and Animal Breeding, Poznan University of Life Sciences, Wolynska 35, 60-637, Poznan, Poland
| | - M Stachowiak
- Department of Genetics and Animal Breeding, Poznan University of Life Sciences, Wolynska 35, 60-637, Poznan, Poland
| | - M Skrzypski
- Department of Animal Physiology, Biochemistry and Biostructure, Poznan University of Life Sciences, Wolynska 35, 60-637, Poznan, Poland
| | - T Nowak
- Department of Animal Reproduction, Poznan University of Life Sciences, Wolynska 35, 60-637, Poznan, Poland
| | - A Maslak
- Vital-Vet Veterinary Surgery, sw. Floriana 4, 62-045, Pniewy, Poland
| | - M Switonski
- Department of Genetics and Animal Breeding, Poznan University of Life Sciences, Wolynska 35, 60-637, Poznan, Poland
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Khan FA, Gartley CJ, Khanam A. Canine cryptorchidism: An update. Reprod Domest Anim 2018; 53:1263-1270. [PMID: 29956390 DOI: 10.1111/rda.13231] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Accepted: 05/28/2018] [Indexed: 12/20/2022]
Abstract
This review article is aimed at providing an update on canine cryptorchidism based on the research studies published in this area over the last 26 years. Although a majority of these research studies were directed at investigating the genetic and molecular basis of cryptorchidism, the mechanisms underlying this problem in dogs are still not clear. Future studies using advanced genomic and molecular approaches and including a larger number of dogs of multiple breeds are required to further our understanding of canine cryptorchidism. Diagnosis and treatment of cryptorchidism in dogs have not received much attention. Research advancements include investigation of ultrasonography and anti-Müllerian hormone assay as potential diagnostic methods. Advancements in treatment include the use of laparoscopic-assisted cryptorchidectomy. Based on the available literature, this method appears to be the best for removal of abdominal cryptorchid testes from dogs. However, future studies that compare laparoscopic-assisted cryptorchidectomy with the traditional approaches are required for a more conclusive determination of the best method for cryptorchidectomy in dogs.
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Affiliation(s)
- Firdous A Khan
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada.,Department of Large Animal Medicine and Surgery, School of Veterinary Medicine, St. George's University, True Blue, Grenada
| | - Cathy J Gartley
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada
| | - Afroza Khanam
- Department of Large Animal Medicine and Surgery, School of Veterinary Medicine, St. George's University, True Blue, Grenada
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Braun BC, Okuyama MW, Müller K, Dehnhard M, Jewgenow K. Steroidogenic enzymes, their products and sex steroid receptors during testis development and spermatogenesis in the domestic cat (Felis catus). J Steroid Biochem Mol Biol 2018; 178:135-149. [PMID: 29196065 DOI: 10.1016/j.jsbmb.2017.11.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Revised: 11/08/2017] [Accepted: 11/23/2017] [Indexed: 11/30/2022]
Abstract
In the present study we comprehensively characterize intratesticular sex steroid production, metabolism and receptors in the domestic cat to elucidate the role of testosterone, estradiol and progesterone in testis development, steroid synthesis and spermatogenesis. There is a great demand for new concepts of fertility control in domestic (feral) cats and wild felids. The acquired knowledge will help to understand the regulation of spermatogenesis in felids, and may reveal new target points for male contraception. Progesterone and androgens are produced throughout all stages of testicular development; their synthesizing enzymes are mainly expressed in Leydig cells, and to a much lesser extent also in tubular cells. Aromatase (CYP19A1), the estrogen synthesizing enzyme, is only present in the tubuli and is first detectable in spermatocytes and round spermatids at puberty. As shown by elevated expression of the enzymes steroid 5-α-reductase type 1 (SRD5A) and aldo-keto-reductase family 1 member C3 (AKR1C3), the capacity to metabolize particular steroids increases during testis development. Apparently, this refers to a decreasing intra-testicular testosterone concentration per mg tissue with increasing testis weight during postpuberty. The increasing potential of sulfation of E2 by estrogen sulfotransferase (SULT1E1) with ongoing development might be responsible for the low level of unconjugated intratesticular estradiol in all stages of development probably due to facilitated excretion of conjugated estrogens. For the first time, expression of the progesterone membrane receptor components 1 and 2 (PGRMC1, PGRMC2) was studied in mammalian testis tissue. Both of these and also the progesterone receptor (PGR) are expressed depending on the developmental stage and cell type, suggesting an important regulatory role of progesterone in the testis. Androgen receptor (AR) is present in almost all cell types except for some spermatogenic cells. The co-localization of aromatase with estrogen receptor alpha (ESR1) in spermatocytes and round spermatids of domestic cat testis indicates an auto-/paracrine function of estrogen in spermatogenesis. In summary, the testis of the domestic cat is an important source of sex steroids. All of them could act within the testis but additionally, at least androgens and estrogens are likely secreted by the testis, partly as conjugated steroids.
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Affiliation(s)
- Beate C Braun
- Leibniz Institute for Zoo and Wildlife Research, Department of Reproduction Biology, PF700430, 10324 Berlin, Germany.
| | - Minami W Okuyama
- Leibniz Institute for Zoo and Wildlife Research, Department of Reproduction Biology, PF700430, 10324 Berlin, Germany
| | - Karin Müller
- Leibniz Institute for Zoo and Wildlife Research, Department of Reproduction Biology, PF700430, 10324 Berlin, Germany
| | - Martin Dehnhard
- Leibniz Institute for Zoo and Wildlife Research, Department of Reproduction Biology, PF700430, 10324 Berlin, Germany
| | - Katarina Jewgenow
- Leibniz Institute for Zoo and Wildlife Research, Department of Reproduction Biology, PF700430, 10324 Berlin, Germany
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