Isolation and partial characterization of secreted mouse pituitary prolactin.
Prolactin secreted by mouse anterior pituitaries was purified by gel filtration on Sephadex G-100. Electrophoretic homogeneity of the purified hormone was demonstrated in several gel systems, and electrophoresis in the presence of sodium dodecyl sulfate indicated an apparent molecular weight of 21 000 +/- 2000. Mouse and ovine prolactin displayed parallel dose vs. response curves in radio-receptor binding studies, indicating that these two hormones compete for identical receptor sites on rabbit mammary membranes. Comparative peptide mapping studies carried out on tryptic digests of mouse and ovine prolactin suggested only partial homology between the two hormones. Internally labeled monomeric mouse prolactin was observed to undergo aggregation following storage at --20 degrees C for 2 months.
D000818:Animals; D005260:Female; D008321:Mammary Glands, Animal / Q000378:metabolism; D051379:Mice; D008970:Molecular Weight; D009924:Organ Culture Techniques; D010446:Peptide Fragments / Q000032:analysis; D010903:Pituitary Gland, Anterior / Q000378:metabolism*; D011388:Prolactin / Q000302:isolation & purification* / Q000378:metabolism; D011956:Receptors, Cell Surface / Q000378:metabolism
D010446:Peptide Fragments; D011956:Receptors, Cell Surface; D011388:Prolactin