Methionine-enkephalin (Met-Enk) has been detected in the testis of the frog, Rana esculenta, using a reverse-phase high-performance liquid chromatography system coupled with a specific radioimmunoassay. By means of immunocytochemical techniques Met-Enk positive cells have been localized in interstitial and germinal compartments. Particularly, spermatogonia, spermatocytes, and spermatozoa were stained in seminiferous tubules, and numerous interstitial cells showed strong cytoplasmic immunoreactivity in summer animals. Variations in the concentration of Met-Enk immunoreactive material occurred during the annual cycle. Our data show that Met-Enk is present in testes of nonmammalian vertebrate species. These results suggest that autocrine and/or paracrine mechanisms may regulate testicular activity in amphibians.

Immunoreactive Met-enkephalin-like material in the testis of Rana esculenta: identification and localization / M., Vallarino; M., Pestarino; M., D'Antonio; S., Fasano; Facchinetti, Fabio; R., Pierantoni. - In: GENERAL AND COMPARATIVE ENDOCRINOLOGY. - ISSN 0016-6480. - STAMPA. - 88:(1992), pp. 137-143.

Immunoreactive Met-enkephalin-like material in the testis of Rana esculenta: identification and localization.

FACCHINETTI, Fabio;
1992

Abstract

Methionine-enkephalin (Met-Enk) has been detected in the testis of the frog, Rana esculenta, using a reverse-phase high-performance liquid chromatography system coupled with a specific radioimmunoassay. By means of immunocytochemical techniques Met-Enk positive cells have been localized in interstitial and germinal compartments. Particularly, spermatogonia, spermatocytes, and spermatozoa were stained in seminiferous tubules, and numerous interstitial cells showed strong cytoplasmic immunoreactivity in summer animals. Variations in the concentration of Met-Enk immunoreactive material occurred during the annual cycle. Our data show that Met-Enk is present in testes of nonmammalian vertebrate species. These results suggest that autocrine and/or paracrine mechanisms may regulate testicular activity in amphibians.
88
137
143
Immunoreactive Met-enkephalin-like material in the testis of Rana esculenta: identification and localization / M., Vallarino; M., Pestarino; M., D'Antonio; S., Fasano; Facchinetti, Fabio; R., Pierantoni. - In: GENERAL AND COMPARATIVE ENDOCRINOLOGY. - ISSN 0016-6480. - STAMPA. - 88:(1992), pp. 137-143.
M., Vallarino; M., Pestarino; M., D'Antonio; S., Fasano; Facchinetti, Fabio; R., Pierantoni
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/739221
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