Immunoreactive prolactin in subcellular fractions from bovine mammary tissue.
Mammary tissue from lactating Holsteins at slaughter was homogenized and fractionated into subcellular compartments. Bovine prolactin was quantified in each subcellular fraction and in preslaughter milk by radioimmunoassay procedures validated for this purpose. Prolactin concentrations were ng prolactin/mg protein for all samples. Immunoreactive prolactin was in rough endoplasmic reticulum (24.8 ng/mg), Golgi apparatus (18.8 ng/mg), and secretory vesicle (10.2 ng/mg). All of these concentrations exceeded that in samples of milk (2.7 ng/mg). Nuclear fractions contained a material that reacted in the prolactin radioimmunoassay, but criteria for valid quantification could not be satisfied. These results confirm prolactin inside bovine mammary cells, and they are consistent with an intracellular pathway for transfer of prolactin from plasma into milk.[1]References
- Immunoreactive prolactin in subcellular fractions from bovine mammary tissue. Malven, P.V., Keenan, T.W. J. Dairy Sci. (1983) [Pubmed]
Annotations and hyperlinks in this abstract are from individual authors of WikiGenes or automatically generated by the WikiGenes Data Mining Engine. The abstract is from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.About WikiGenesOpen Access LicencePrivacy PolicyTerms of Useapsburg
