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Epididymal Sperm Maturation in Bats with Prolonged Sperm Storage
Rodríguez-Tobón Ahiezer,
León-Galván Miguel A.,
Arenas-Ríos Edith
Issue:
Volume 3, Issue 1-1, February 2015
Pages:
1-7
Received:
28 January 2015
Accepted:
6 February 2015
Published:
16 February 2015
Abstract: Epididymal sperm maturation is the process through which sperm acquire the potential to fertilize the egg. For most mammals, studies report that this process is completed before the sperm enter the cauda region of the epididymis; however, in some bat species, such as the Mexican big-eared bat (Corynorhinus mexicanus), this does not occur, as the process does not end until the sperm are inside the cauda of the epididymis, and thus is associated with a long storage period.
Abstract: Epididymal sperm maturation is the process through which sperm acquire the potential to fertilize the egg. For most mammals, studies report that this process is completed before the sperm enter the cauda region of the epididymis; however, in some bat species, such as the Mexican big-eared bat (Corynorhinus mexicanus), this does not occur, as the pr...
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Gamma GlutamylTranspeptidase Activity Determination in Epididymis of Corynorhinusmexicanus Bat Throughout Its Annual Cycle
Arenas-Ríos Edith,
Rosado Adolfo,
Rodríguez-Tobón Ernesto,
Rodríguez-Tobón Ahiezer,
León-Galván Miguel Ángel
Issue:
Volume 3, Issue 1-1, February 2015
Pages:
8-12
Received:
28 January 2015
Accepted:
29 January 2015
Published:
27 February 2015
Abstract: GGT initiates the degradation of both oxidized and reduced glutathione at the cell surface by cleaving the unique gamma glutamyl bond. The successive hydrolysis of oxidized or reduced CysGly by aminopeptidase or dipeptidase releases Gly, and cysteine/cysteine is recovered for intracellular synthesis of glutathione. In addition, GGT plays a major physiological role in providing cysteine to cells for GSH synthesis and protein synthesis, thereby playing a major role in antioxidant defense and normal growth. GGT is present in the epididymis, principally in caput. The catalytic activity of GGT is highest in the proximal epididymal regions and decreases toward the distal regions; participating in the epididymal sperm maturation process.In most mammals, epididymal sperm maturation takes place in a period not exceeding ten days, ending in the distal part of the corpus of the epididymis, before reaching the caudal region, which is responsible only for sperm storage; however, in C. mexicanus the epididymal sperm maturation ends in caudal epididymalregion.For this reason, the main goal of the present study was to determine the relationship between the GGT activity through the caput and caudal epididymal regions, throughout annual cycle of Corynorhinusmexicanus bat.We found that the GGT activity appears to be important for epididymal sperm maturation in C. mexicanus bat in cephalic region, and important for protection against ROS epididymal caudal region.
Abstract: GGT initiates the degradation of both oxidized and reduced glutathione at the cell surface by cleaving the unique gamma glutamyl bond. The successive hydrolysis of oxidized or reduced CysGly by aminopeptidase or dipeptidase releases Gly, and cysteine/cysteine is recovered for intracellular synthesis of glutathione. In addition, GGT plays a major ph...
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Abandoned Mines Used as Roosts for Reproduction by Townsend’s Big-Eared Bats (Corynorhinus townsendii) in a Protected Area in the Central Highlands of Mexico
León-Galván Miguel Angel,
Rodríguez-Tobón Ahiezer,
Cano Espinoza José Sulim,
Guzman Ledesma Beatriz Samantha,
Guevara-Chumacero Luis Manuel,
Leyequien Abarca Lissette
Issue:
Volume 3, Issue 1-1, February 2015
Pages:
13-21
Received:
11 February 2015
Accepted:
11 February 2015
Published:
27 February 2015
Abstract: In Chihuahuan Desert arid zone, particularly the states of Zacatecas and San Luis Potosi, Mexico, have been distinguished by its large mining activity, however, many of these mines are disuse, becoming potential refuges for various species of cave bats. Monitoring the potential roosts by Corynorhinus townsendii was made within the system of mines in the vicinity of the Sierra La Mojonera Flora and Fauna Protection Area, at Mexico’s Central Highlands in the states of Zacatecas and San Luis Potosi. Which consisted of visual inspection inside, and mist netting at the entrance of different mines during an annual cycle. The main reproductive roosts for C. townsendii were identified. Spermatogenesis takes place during May-September; the mating period in November-December, whereas the sequence of gestation-lactation occurred since March to August of the next year. These data confirm that C. townsendii in the area of study follow a seasonally monoestrous reproductive pattern, characterized by an asynchrony between the ovarian and spermatogenic cycles.
Abstract: In Chihuahuan Desert arid zone, particularly the states of Zacatecas and San Luis Potosi, Mexico, have been distinguished by its large mining activity, however, many of these mines are disuse, becoming potential refuges for various species of cave bats. Monitoring the potential roosts by Corynorhinus townsendii was made within the system of mines i...
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Relationship Between the Amount of Subcutaneous Fat, Testicular Morphometry, Epididymis and Some Sperm Parameters in Leptonycteris yerbabuenae Bat Before, During and After Mating
Martínez-Coronel Matías,
Munguía-Pérez Alma Alicia,
Arenas-Ríos Edith
Issue:
Volume 3, Issue 1-1, February 2015
Pages:
22-27
Received:
26 January 2015
Accepted:
26 January 2015
Published:
5 March 2015
Abstract: Studies in reproductive age mammals show that the increase in fat content is inversely related to sperm quality in response to a decrease in testosterone levels. In turn the decrease in androgen concentration is related to morphophysiological involution in the testis and epididymis. However, the bat Leptonycteris yerbabuenae increases the body fat content previous the mating period, contrary to what was reported in most mammals. Therefore the aim of this study was to determine the importance of variation in fat content in L. yerbabuenae in relation to testicular and epididymal cycle; and sperm parameters. The results clearly show an increase in the fat content as it approaches the mating season. Also, there is an increase in the size of the testis and epididymis. In the post-mating months, both: fat and testis, decrease and the sperm cells were not presents. Leptonycteris yerbabuenae has a different behaviour to most mammals, accumulate fat while producing, transit and sperm storage could be happening. So, in this model, we must do studies that meet these processes emerging from that reported in other mammals.
Abstract: Studies in reproductive age mammals show that the increase in fat content is inversely related to sperm quality in response to a decrease in testosterone levels. In turn the decrease in androgen concentration is related to morphophysiological involution in the testis and epididymis. However, the bat Leptonycteris yerbabuenae increases the body fat ...
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