Cycle of the Seminiferous Epithelium in the Java Fruit Bat (Pteropus vampyrus) and the Japanese Lesser Horseshoe Bat (Rhinolophus cornutus).

Morigaki, Takashi; Kurohmaru, Masamichi; Kanai‐Azuma, Masami; Mukohyama, Mitsuru; Hondo, Eiichi; Yamada, Junzo; Agungpriyono, Srihadi; Hayashi, Yoshihiro

doi:10.1292/jvms.63.773

Cited by 14 publications

(9 citation statements)

References 18 publications

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“…It exhibited a constant and well-defined seminiferous epithelium cycle, without a quiescent period in the winter and early spring, similar to that seen in most Neotropical mammals and in some species of Megachiroptera (Saidapur and Patil, 1992;Morigaki et al, 2001;Krutzsch, 2005). But M. nigricans differs not only from the phyllostomid bats, but also from other vespertilionids, not presenting the quiescent period and exhibiting asynchrony in the seminiferous epithelium cycle.…”

Section: Discussionsupporting

confidence: 60%

“…This was similar to observations in the majority of the mammals, except in hominids, where two or more stages are present in the same section of the seminiferous tubule, in a helical spiral arrangement (Smithwick et al, 1996;Wistuba et al, 2003). The number of recognized stages in the five species analyzed was similar to that observed in the pteropodid P. poliocephalus, and less than that observed in rhinopomatid R. kinneari and also in the pteropodid P. vampyrus that presented 11 stages and R. leschenaulti and Rhinolophus cornutus that presented 10 stages (Singwi and Lall, 1983;Saidapur and Patil, 1992;Morigaki et al, 2001). The differences observed between the species can be mainly attributed to different classification criteria utilized by the authors and secondarily to species-specific variation.…”

Section: Discussionmentioning

confidence: 49%

“…Although testicular histoarchitecture and seasonal changes in the germinal epithelium, the Sertoli cells and the Leydig cells have been described in some oriental and occidental species of Micro-and Mega-chiroptera, information about the kinetics of the process is still scarce (Anand Kumar, 1965;Racey and Tam, 1974;Singwi and Lall, 1983;McGuckin and Blackshaw, 1987;Saidapur and Patil, 1992;Entwistle et al, 1998;Morigaki et al, 2001;Kurohmaru et al, 2002;Lee, 2003;Sharifi et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Morphological characterization of the testicular cells and seminiferous epithelium cycle in six species of Neotropical bats

Beguelini

Moreira

Faria

et al. 2009

Journal of Morphology

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We know little about the process of spermatogenesis in bats, a great and diverse clade of mammals that presents different reproductive strategies. In the present study, spermatogenesis in six species of Neotropical bats was investigated by light microscopy. On the basis of chromatin condensation, nuclear morphology, relative position to the basal membrane and formation of the flagellum, three types of spermatogonia were recognized: dark type A (A(d)), pale type A (A(p)), and type B; the development of spermatids was divided into seven steps. With the exception of Myotis nigricans, the seminiferous epithelium cycle of the other five species studied was similar to those of other mammals, showing gradual stages by the tubular morphology method. Asynchrony was observed in the seminiferous epithelium cycle of M. nigricans, shown by overlapping stages and undefined cycles. The frequencies found in the three phases of the cycle were variable with the greatest frequency occurring in the postmeiotic phase (>50%) and the least in the meiotic phase (<10%). The similarities observed in the five species of Phyllostomidae appeared to be related to their phylogenetic relationship and shorter divergence times, whereas the differences in M. nigricans appeared to be related to its greater phylogenetic distance because the Vespertilionidae family diverged earlier.

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Section: Discussionsupporting

confidence: 60%

Section: Discussionmentioning

confidence: 49%

Section: Introductionmentioning

confidence: 99%

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Morphological characterization of the testicular cells and seminiferous epithelium cycle in six species of Neotropical bats

Beguelini

Moreira

Faria

et al. 2009

Journal of Morphology

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“…Morphologically, the seminiferous epithelium of S. lilium follows the pattern observed in other bat species (Singwi & Lall, 1983;Saidapur & Patil, 1992;Morigaki et al 2001;Beguelini et al 2009;Oliveira et al 2009), and in other mammal species (Paula et al 1999;Lloyd et al 2008;Soares et al 2009;Balarini et al 2011;Costa et al 2011), with distinct arrangements between the different generations of germ cells. The eight stages of the SEC, designated in S. lilium, according to the tubular morphology method, also followed the pattern found in other bats (Beguelini et al 2009;Oliveira et al 2009), as well as in other non-primate mammals (Paula et al 1999;Bittencourt et al 2007;Lloyd et al 2008;Balarini et al 2011;Costa et al 2011).…”

Section: Discussionsupporting

confidence: 59%

Stages and duration of the seminiferous epithelium cycle in the bat Sturnira lilium

et al. 2013

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Knowledge of the stages that compose the seminiferous epithelium cycle (SEC) and determination of the duration of spermatogenic processes are fundamental for the accurate quantification of the dynamics of spermatogenesis. The aim of this study was to characterize the stages that compose the SEC of the bat Sturnira lilium, including evaluation of the average frequency of each of these stages throughout the year and calculation of the duration of the spermatogenic process. An ultrastructural characterization of the formation of the acrosomal cap was also performed. Testicular fragments were processed for morphological and immunohistochemical analysis as well as ultrastructural analysis using transmission electron microscopy. According to the tubular morphology method, the SEC in S. lilium is divided into eight stages, following the pattern found in other mammals. Primary spermatocytes were found at zygotene in stage 1 of the cycle. There was no variation in frequency of each of the stages over the seasons, with stage 1 being the most frequent, and stage 7 the least frequent. The duration of one seminiferous epithelium cycle was 3.45 days, and approximately 15.52 days were required for the development of sperm from spermatogonia. Ultrastructural characterization allowed the formation of the acrosomal cap in round spermatids to be monitored. In conclusion, the stages that compose the SEC in S. lilium are generally similar to those described for other mammals, but the duration of the spermatogenic process is shorter than previously recorded for mammals. The presence of primary spermatocytes at zygotene in stage 1 of the cycle is probably due to the longer duration of this stage.

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“…The spermiogenesis process tends to be species‐specific, presenting different characteristics in each species. The number of steps in spermatid differentiation in bats varies widely, from 9 in Myotis macrodactylus (Lee,2003), 10 in Rhinolophus ferrumequinum korai (Lee et al,1992), 13 in Pteropus vampyrus and Rhinolophus cornutus (Morigaki et al,2001), 14 in Rousettus leschenaulti (Saidapur and Patil,1992), to 16 steps in Rhinopoma kinneari (Singwi and Lall,1983). Although M. molossus belongs to a different family than Platyrrhinus lineatus , another Neotropical species (Beguelini et al,2011a), it also had 12 steps in the spermiogenesis process.…”

Section: Discussionmentioning

confidence: 99%

Ultrastructural characteristics of spermatogenesis in Pallas's mastiff bat, Molossus molossus (Chiroptera: Molossidae)

Beguelini

Taboga

Morielle‐Versute

2012

Microscopy Res & Technique

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Despite the large number of species, their wide distribution, and unique reproductive characteristics, Neotropical bats have been poorly studied, and important aspects of the reproduction of these animals have not been elucidated. We made an ultrastructural analysis of spermatogenesis in Molossus molossus (Molossidae). The process of spermatogonial differentiation is similar to that found in other bats and is also relatively similar to that of Primates, with three main spermatogonia types: A(d), A(p), and B. Meiotic divisions proceed similarly to those of most mammals, and spermiogenesis is clearly divided into 12 steps, in the middle of the range known for bats (9-16 steps). Formation of the acrosome is similar to that known from other mammals; however, the ultrastructure of spermatozoa was found to have unique characteristics, including many wavy acrosomal projections on its surface, which seems to be specific for the family Molossidae. Comparing the ultrastructure of the spermatozoon of M. molossus with other bats already study, we observed that three characters vary: morphology of the outer dense fibers, of the perforatorium, and of the spermatozoon head. The great similarity of morphological characters between M. molossus and Platyrrhinus lineatus suggests that M. molossus is more closely related to the Phyllostomidae than to the Rhinolophidae and the Vespertilionidae.

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Cycle of the Seminiferous Epithelium in the Java Fruit Bat (Pteropus vampyrus) and the Japanese Lesser Horseshoe Bat (Rhinolophus cornutus).

Cited by 14 publications

References 18 publications

Morphological characterization of the testicular cells and seminiferous epithelium cycle in six species of Neotropical bats

Morphological characterization of the testicular cells and seminiferous epithelium cycle in six species of Neotropical bats

Stages and duration of the seminiferous epithelium cycle in the bat Sturnira lilium

Ultrastructural characteristics of spermatogenesis in Pallas's mastiff bat, Molossus molossus (Chiroptera: Molossidae)

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