Hormones and Reproductive Cycles in Anuran Amphibians

Rastogi, Rakesh K.; Pinelli, Claudia; Polese, Gianluca; D’Aniello, Biagio; Chieffi-Baccari, Gabriella

doi:10.1016/b978-0-12-374931-4.10009-4

Cited by 31 publications

(43 citation statements)

References 76 publications

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“…The mGnRH 'anterior group' is located in the nervus terminalis and septo-preoptic area, whereas the 'posterior group' spreads along the posterior diencephalon and anterior midbrain [D'Aniello et al, 1991[D'Aniello et al, , 1995Rastogi et al, 1998;Tsai, 2011]. It has been reported that in amphibians the hypothalamic mGnRH form acts as a key neurohormone for reproduction [Rastogi et al, 2005[Rastogi et al, , 2011.…”

Section: Introductionmentioning

confidence: 99%

Neuroanatomical Organization of the Brain Gonadotropin-Inhibitory Hormone and Gonadotropin-Releasing Hormone Systems in the Frog Pelophylax esculentus

et al. 2014

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Growing evidence suggests that gonadotropin-inhibitory hormone (GnIH) may play a key role in mediating vertebrate reproduction. GnIH inhibits gonadotropin synthesis and release by decreasing the activity of gonadotropin-releasing hormone (GnRH) neurons as well as by directly regulating gonadotropin secretion from the pituitary. Whereas the presence of GnIH has been widely investigated in various classes of vertebrates, there are very few immunohistochemical reports focusing on GnIH in amphibians. The aim of this study was to assess the presence and neuroanatomical distribution of GnIH-like immunoreactivity in the brain of the anuran amphibian Pelophylax (Rana) esculentus (esculenta) and to explore any potential anatomical relationship with mammalian GnRH-immunoreactive (mGnRH-ir) elements. The GnIH-like immunoreactive (GnIH-ir) system constitutes two distinct subpopulations in the telencephalon and diencephalon, with the highest number of immunoreactive cells located in the preoptic and suprachiasmatic areas. GnIH-ir neurons were also observed in the medial septum, the anterior commissure, the dorsal hypothalamus, the periventricular nucleus of the hypothalamus, and the posterior tuberculum. Scattered GnIH-ir fibers were present in all major subdivisions of the brain but only occasionally in the median eminence. mGnRH-ir neurons were distributed in the mediobasal telencephalon, the medial septal area, and the anterior preoptic area. Double-label immunohistochemistry revealed that the GnRH and GnIH systems coexist and have overlapping distributions at the level of the anterior preoptic area. Some GnIH-ir fibers were in close proximity to mGnRH-ir cell bodies. Our results suggest that both the neuroanatomy and the functional regulation of GnRH release are conserved properties of the hypothalamic GnIH-ir system among vertebrate species.

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Section: Introductionmentioning

confidence: 99%

Neuroanatomical Organization of the Brain Gonadotropin-Inhibitory Hormone and Gonadotropin-Releasing Hormone Systems in the Frog Pelophylax esculentus

et al. 2014

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“…If there is an interaction between a female’s hormonal state and her reception of auditory signals, then we would predict that hormonal state could influence her phonotactic behavior and selectivity. Hormonal profiles do change seasonally in anurans (reviewed in Rastogi et al, 2005), and there is some evidence that hormonal state does influence sensory perception. Seasonal changes in midbrain auditory neuron sensitivity occur in Hyla chrysoscelis , the sister species of H. versicolor , showing that females had lower auditory thresholds during the breeding season, compared to the thresholds of frogs tested outside the breeding period (Hillery 1984).…”

Section: Introductionmentioning

confidence: 99%

Hormonal modulation of phonotaxis and advertisement-call preferences in the gray treefrog (Hyla versicolor)

Gordon

Gerhardt

2009

Hormones and Behavior

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Hormonal levels fluctuate during the breeding season in many anurans, but the identity of the hormones that modulate breeding behavior and their effects remain unclear. We tested the influence of a combined treatment of progesterone and prostaglandin on phonotaxis, the key proceptive reproductive behavior of female anurans. First, we found that female gray treefrogs (Hyla versicolor) treated with progesterone and prostaglandin exhibited phonotaxis to synthetic male advertisement signals significantly more often than animals treated with ringers vehicle or uninjected controls. Responsive females had greater levels of plasma progesterone and estradiol compared to both control groups, suggesting that these steroids may be promoting phonotaxis. Second, we found that the selectivity of hormonally-induced phonotaxis in H. versicolor was similar to that observed in freshly captured breeding animals. Females made the same choices between acoustic signals after hormone treatments in tests of frequency, call rate and pulse rate, compared to their responses without treatment immediately after collection from the breeding chorus. The preference for a longer call was, however, significantly weaker after hormone induction of phonotaxis. Hormonally primed females were also less likely to respond in any test and took longer to respond than did freshly collected females. Consequently, our study shows how progesterone-prostaglandin induced phonotaxis in female treefrogs influences both the quality and quantity of phonotaxis, relative to that exhibited by naturally breeding females.

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“…Male gametogenesis, occurring in the seminiferous tubules of the testis, involves proliferation of spermatogonia (SPG), meiotic division of primary and secondary spermatocytes (I and II SPC), and differentiation of spermatids (SPT) in spermatozoa (SPZ) (Hess, '99;Rastogi et al, 2005). Despite the ever-increasing knowledge on this process collected in recent years, a full understanding of the regulation of spermatogenesis is still far from being reached (McLachlan et al, 2002;Rastogi et al, 2005).…”

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confidence: 99%

“…Despite the ever-increasing knowledge on this process collected in recent years, a full understanding of the regulation of spermatogenesis is still far from being reached (McLachlan et al, 2002;Rastogi et al, 2005). In this respect, the use of nonmammalian vertebrates as an animal model has revealed to be a successful choice to delve into the problem.…”

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confidence: 99%

“…In this respect, the use of nonmammalian vertebrates as an animal model has revealed to be a successful choice to delve into the problem. In fact, the high complexity of testicular organization in mammals makes the study of discrete stages of germ cell (GC) progression in vivo difficult, and in vitro systems are often unable to reproduce its composite physiology; in this context the peculiar features of testicular morphology and activity of some nonmammalian species make them suitable for simplifying the study of spermatogenesis (Pierantoni et al, 2002;Chaves-Pozo et al, 2005;Rastogi et al, 2005).…”

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confidence: 99%

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Evidence for the involvement of prothymosin α in the spermatogenesis of the frog Rana esculenta

Ferrara¹,

Izzo²,

Liguori³

et al. 2008

J. Exp. Zool.

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Prothymosin alpha (PTMA) is a small acidic protein abundantly and ubiquitously expressed in mammals and involved in different biological activities. Until now, its specific function in spermatogenesis has never been properly investigated. Recently, the isolation of a cDNA encoding for PTMA from the testis of the frog Rana esculenta has been reported: ptma transcript is highly expressed throughout the frog reproductive cycle, peaking in September/October, in concomitance with the germ cell maturation; it is specifically localized in the cytoplasm of primary and secondary spermatocytes and, at a lower level, in the interstitial compartment, in Leydig cells.In this article we support the involvement of PTMA in the meiotic phases of frog spermatogenesis. The expression of ptma mRNA increases in the testis of frogs treated with the antiandrogen cyproterone acetate, which blocks the II meiotic division and induces an increase in SPC cysts; on the contrary, it highly decreases in the testis of animals kept at 4 degrees C and treated with human corionic gonadotropin, in concomitance with the induced block of spermatogenesis and the disappearance of meiotic cells in the tubules. Furthermore, for the first time we have also evidenced by immunohistochemistry the expression of PTMA in the nuclei of secondary spermatocytes, spermatids, and spermatozoa, as well as in the cytoplasm of interstitial Leydig cells. Taken together our data suggest for an important role of PTMA in germ cell maturation and/or differentiation during R. esculenta spermatogenesis.

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Hormones and Reproductive Cycles in Anuran Amphibians

Cited by 31 publications

References 76 publications

Neuroanatomical Organization of the Brain Gonadotropin-Inhibitory Hormone and Gonadotropin-Releasing Hormone Systems in the Frog <b><i>Pelophylax esculentus</i></b>

Neuroanatomical Organization of the Brain Gonadotropin-Inhibitory Hormone and Gonadotropin-Releasing Hormone Systems in the Frog <b><i>Pelophylax esculentus</i></b>

Hormonal modulation of phonotaxis and advertisement-call preferences in the gray treefrog (Hyla versicolor)

Evidence for the involvement of prothymosin α in the spermatogenesis of the frog Rana esculenta

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