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Digitale Medien

Ultrastructural localization of prolactin, growth hormone and luteinizing hormone by immunocytochemical techniques in the bovine pituitary (1976)

Dacheux, F. ; Dubois, M. P.

Springer

Cell & tissue research 174 (1976), S. 245-260

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ISSN: 1432-0878

Schlagwort(e): Pituitary gland (bovine) ; Prolactin ; Growth hormone ; Luteinizing hormone ; Immunocytochemistry, ultrastructural

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Medizin

Notizen: Summary The technique of ultrastructural immunocytochemistry involving the unlabeled antibody and the soluble peroxidase-antiperoxidase complex was used to identify and describe the prolactin (P) cells, somatotropic (STH) cells and luteinizing hormone (LH) cells in the bovine anterior pituitary gland. This method was used to localize the three hormones at the electron microscopic level. Staining of varying intensity was found on the secretory granules and on the small granules and vesicles within the Golgi complex. No stain was found in nuclei, on mitochondria or in the endoplasmic reticulum.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00222162

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Digitale Medien

Water insoluble fraction of egg yolk maintains porcine sperm motility by activating adenylate cyclase (1991)

Okamura, N. ; Onoe, S. ; Sugita, Y. ; [weitere]

New York, NY [u.a.] : Wiley-Blackwell

Molecular Reproduction and Development 28 (1991), S. 136-142

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ISSN: 1040-452X

Schlagwort(e): Boar ; Bicarbonate ; cAMP ; Epididymis ; Maturation ; Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie

Notizen: The decrease in motility of porcine cauda epididymal sperm was less than that of caput epididymal sperm in the medium containing bicarbonate. This may be due to the difference of sensitivity of adenylate cyclase to bicarbonate between mature and immature sperm; activation of mature sperm enzyme by bicarbonate was higher than that of immature sperm. Nondialysable fraction of egg yolk prevented the decrease in motility of immature sperm in the presence of bicarbonate, but it was not effective for the motility of mature sperm under the same condition, because only bicarbonate is sufficient for the maintenance of its motility. In the absence of bicarbonate, both mature and immature sperm required egg yolk to maintain motility.The favorable effect of egg yolk on the motility is ascribed to the enhancement of intracellular cAMP level. Partial fractionation of egg yolk showed that water-insoluble lipoprotein fraction contains factor(s) which activates adenylate cyclase in sperm plasma membrane. This is the first report in which high molecular weight activator of the sperm enzyme was demonstrated.

Zusätzliches Material: 6 Ill.