Leydig Cells
Mostrando 37-48 de 152 artigos, teses e dissertações.
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37. Morphometric evaluation of the testis and spermatogenesis in adult oncelot (Leopardus pardalis, Linnaeus, 1758) / Avaliação morfométrica do testículo e da espermatogênese de jaguatiricas (Leopardus pardalis, Linnaeus, 1758) adultas
To study the spermatogenetic cycle in ocelots, were used, three adult males, proceeding from the Centro de Triagem de Animais Silvestres the Federal University of Viçosa and two adult males proceeding from the Fundação Zoobotânica of Belo Horizonte/MG/Brazil, authorized by the IBAMA-MG. These animals were submitted to general anesthesia, weighed and its
Publicado em: 2006
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38. Morpho-functional characteristics of sex reversal in Synbranchidae (Teleostei: Synbranchiformes) / Perfil morfo-funcional da inversão de sexo em Synbranchidae (Teleostei: Synbranchiformes)
Teleost fishes exhibit several sexual patterns during their ontogeny, in which the gonads change into functional ovaries or testes. In distinct Orders, both gonochoristic and hermaphrodite species, simultaneous as well as sequential or consecutive, can be found. In sequential hermaphroditism (protandrous or protogynous), sex change in adult individuais invol
Publicado em: 2006
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39. Macro and microscopical aspects of the male genital organs in the Pantanal alligator (Caiman crocodylus yacare) - DAUDIN 1802 / Aspectos macro e microscópicos dos órgãos genitais masculinos no jacaré-do-Pantanal (Caiman crocodylus yacare) - DAUDIN 1802
Ten Young-aged male Pantanal alligators (Caiman crocodylus yacare) were used; seven specimes were destinated to macroscopic study and the other three were used in the study of light microscopy. After the opening of the pleuroperitoneal cavity, we observed and identified that testes are in pairs and adhered to the dorsal wall of the pleuroperitoneal cavity. T
Publicado em: 2006
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40. Regulação da proliferação pós-natal das células de Sertoli em ratos
When indicating the number of spermatozoa produced in an adult animal, the neonatal period, in which the final number of Sertoli cells is established in rats, is key. It is believed that the main mitogenic factor of Sertoli cells is the FSH, while the thyroid hormone triiodothyronine (T3) would be responsible for the regulation of the maturation/differentiat
Publicado em: 2006
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41. Efeito do tratamento crônico com extratos de Heteropterys aphrodisiaca O. Mach. e Anemopaegma arvense (Vell.) Stellf. no testículo de ratos Wistar adultos / Effects of the cronical treatment with extracts from Heteropterys aphrodisiaca O. Mach. and Anemopaegma arvense (Vell.) Stellf. in the testicle of adult rats Wistar
The traditional medicine offers large indications for scientific experimentations involving vegetal products that have been used by the population for a long time. Among the several plants, those considered aphrodisiac have an outstanding role in the popular medicine. The most emphatic indications in the State of Mato Grosso refer to the species Heteropterys
Publicado em: 2005
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42. Morphofunctional analysis of the testis and spermatogenesis in adult African lions (Panthera leo, Linnaeus, 1758) / Análise morfofuncional do testículo e espermatogênese de leões africanos (Panthera leo, Linnaeus, 1758) adultos
The study of the testis morphology and the spermatogenetic process in wild animals is fundamentally important for the knowledge about the physiologic patterns by which the assisted reproduction protocols are established. The following objectives were proposed in this study: to describe the data of both testis morphometry and seminiferous tubule; to quantify
Publicado em: 2005
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43. Plasma and testicular testosterone levels, volume density and number of Leydig cells and spermatogenic efficiency of rabbits
Plasma and tissue testosterone concentrations were determined by radioimmunoassay in 12 eight-month-old sexually mature New Zealand White rabbits and evaluated for possible associations with spermatogenic efficiency as well as with volume density and number of Leydig cells. Testicular tissue was processed histologically and histometry was performed in order
Brazilian Journal of Medical and Biological Research. Publicado em: 2002-04
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44. Histopathological changes in albino mouse testis induced by the administration of Tityus n. sp. venom
Scorpion envenoming is a public health concern in northeastern Venezuela. Specimens of the genus Tityus are responsible for most of these. In experimental animals, Tityus venom produces histopathological changes in the skeletal muscle and pancreas, but its toxicity to the reproductive system has not been studied. The aim of this work is to describe the histo
Journal of Venomous Animals and Toxins. Publicado em: 2000
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45. Avaliação funcional das celulas de Leydig e de Sertoli em 24 casos de ambiguidade genital com cariotipo 46,XY
The investigation of the origin of sex ambiguity is a very complex matter. Sex differentiation is dependent upon the action of two testicular hormones: testosterone and anti-Müllerian hormone (AMH). Although testicular function has traditionally been assessed only by examining the steroidogenic capacity of Leydig cells and spermatogenesis, it has recently b
Publicado em: 1999
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46. Ultrastructure of Leydig cells in human ageing testes.
Ultrastructural study of Leydig cells in elderly men revealed the following Leydig cell types: (1) ultrastructurally normal Leydig cells (46.2%); (2) Leydig cells either with multiple cytoplasmic or intranuclear Reinke crystals or with numerous para-crystalline inclusions (6.1%); (3) multivacuolated Leydig cells with the cytoplasm almost filled by lipid drop
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47. Stimulation of TM3 Leydig cell proliferation via GABAA receptors: A new role for testicular GABA
The neurotransmitter gamma-aminobutyric acid (GABA) and subtypes of GABA receptors were recently identified in adult testes. Since adult Leydig cells possess both the GABA biosynthetic enzyme glutamate decarboxylase (GAD), as well as GABAA and GABAB receptors, it is possible that GABA may act as auto-/paracrine molecule to regulate Leydig cell function. The
BioMed Central.
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48. Long-term suppression of Leydig cell steroidogenesis prevents Leydig cell aging
Male aging is accompanied by reduced testosterone production by the Leydig cells, the testosterone-producing cells of the testis. The mechanism by which this occurs is unknown. Based on the observations that reactive oxygen is capable of damaging components of the steroidogenic pathway and that reactive oxygen is produced during steroidogenesis itself, we hy
The National Academy of Sciences.