title: Derivation of sperm from xenografted testis cells and tissues of the peccary (Tayassu tajacu).
abstract: Because the collared peccary (Tayassu tajacu) has a peculiar Leydig cell cytoarchitecture, this species represents a unique mammalian model for investigating testis function. Taking advantage of the well-established and very useful testis xenograft technique, in the present study, testis tissue and testis cell suspensions from immature collared peccaries (n=4; 3 months old) were xenografted in SCID mice (n=48) and evaluated at 2, 4, 6, and 8 months after grafting. Complete spermatogenesis was observed at 6 and 8 months after testis tissue xenografting. However, probably due to de novo testis morphogenesis and low androgen secretion, functionally evaluated by the seminal vesicle weight, a delay in spermatogenesis progression was observed in the testis cell suspension xenografts, with the production of fertile sperm only at 8 months after grafting. Importantly, demonstrating that the peculiar testicular cytoarchitecture of the collared peccary is intrinsically programmed, the unique Leydig cell arrangement observed in this species was re-established after de novo testis morphogenesis. The sperm collected from the xenografts resulted in diploid embryos that expressed the paternally imprinted gene NNAT after ICSI. The present study is the first to demonstrate complete spermatogenesis with the production of fertile sperm from testis cell suspension xenografts in a wild mammalian species. Therefore, due to its unique testicular cytoarchitecture, xenograft techniques, particularly testis cell suspensions, may represent a new and very promising approach to evaluate testis morphogenesis and to investigate spermatogonial stem cell physiology and niche in the collared peccary.
authors: Paulo Henrique Almeida
authors: PH
authors: Campos-Junior
authors: Guilherme Mattos Jardim
authors: GM
authors: Costa
authors: Gleide Fernandes
authors: GF
authors: Avelar
authors: Samyra Maria Santos Nassif
authors: SM
authors: Lacerda
authors: Nathália Nogueira
authors: NN
authors: da Costa
authors: Otávio Mitio
authors: OM
authors: Ohashi
authors: Moysés dos Santos
authors: Mdos S
authors: Miranda
authors: Lucíola Silva
authors: LS
authors: Barcelos
authors: Erika Cristina
authors: EC
authors: Jorge
authors: Diva Anelie
authors: DA
authors: Guimarães
authors: Luiz Renato
authors: LR
authors: de França
mesh_terms: D000818:Animals; D001188:Artiodactyla / Q000502:physiology*; D002478:Cells, Cultured; D046149:Embryo Culture Techniques; D004622:Embryo, Mammalian; D005260:Female; D008297:Male; D051379:Mice; D016513:Mice, SCID; D054315:Oocyte Retrieval / Q000662:veterinary; D020554:Sperm Injections, Intracytoplasmic / Q000662:veterinary; D013091:Spermatogenesis; D013093:Spermatogonia / Q000166:cytology / Q000502:physiology* / Q000637:transplantation*; D013094:Spermatozoa / Q000166:cytology / Q000637:transplantation; D013737:Testis / Q000166:cytology* / Q000637:transplantation*; D014183:Transplantation, Heterologous