Isolation and culture of somatotrophs from the pituitary of the rainbow trout: Immunological and physiological characterization
Autor: | P.-Y. Le Bail, F Dacheux, M Bougoussa, E Sambroni, Maurice Loir, Claudine Weil |
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Rok vydání: | 1994 |
Předmět: |
Male
endocrine system medicine.medical_specialty Pituitary gland Somatotropic cell Cell Separation Biology Gonadotropic cell Internal medicine medicine Animals Centrifugation Spermatogenesis Cells Cultured Cell Biology General Medicine Somatotrophs medicine.anatomical_structure Endocrinology Cell culture Growth Hormone Oncorhynchus mykiss Pituitary Gland Percoll hormones hormone substitutes and hormone antagonists Developmental Biology Endocrine gland |
Zdroj: | In Vitro Cellular & Developmental Biology - Animal. 30:162-167 |
ISSN: | 1543-706X 1071-2690 |
Popis: | The aim of the present paper was to obtain somatotroph- and gonadotroph-enriched populations from collagenase dispersed pituitaries of male rainbow trout. Inasmuch as the percentage of immunoreactive gonadotrophs and somatotrophs present in pituitaries was higher at spermiation than at the beginning of spermatogenesis, we tried such a cell separation with fish at this stage of spermatogenesis. Cells were fractionated using their differences in buoyant density with centrifugation in Percoll solutions. The use of Percoll linear gradients (1.110 to 1.027 g/ml) showed that somatotroph cells have a density of between 1.102 and 1.064 g/ml whereas gonadotrophs are spread over the range of the gradient. It was thus possible, by using linear or discontinuous Percoll gradients, to obtain 95 to 67% (mean 80%) enriched somatotropic cell fractions while no enriched gonadotropic cell fractions were collected. The fractionated cells kept their ability to be cultured and to be responsive to specific secretagogues. Somatostatine induced a 80 to 85% decrease in growth hormone release per somatotroph in the initial cell suspension as well as in the different cell fractions. On the other hand, the basal growth hormone release per cell was lower in the fractions containing cells with a density lower than 1.062 g/ml. Inversely, the gonadotrophs have a basal release per cell independent of their density, and this is also available for their responsiveness to salmon gonadotropin-releasing hormone. |
Databáze: | OpenAIRE |
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