Rabbit ovarian protein kinases. II. Effect of an ovulatory dose of human chorionic gonadotropin or luteinizing hormone on the multiplicity of follicular and luteal protein kinases.
DEAE-cellulose chromatography of the 105,000 X g supernatant fraction (cytosol) obtained from popped estrous rabbit follicles revealed the presence of a single form of cAMP-dependent protein kinase, designated protein kinase 3. The iv injection of an ovulatory dose of hCG to estrous rabbits promoted the appearance of a second, transient peak of cytosol cAMP-dependent protein kinase, protein kinase 1. Protein kinase 1 was detected within 10 min of hCG administration but had regressed to undetectable levels by 24 h in corpora lutea (CL) of pseudopregnancy and by 72 h in CL of pregnancy. Ovulation and subsequent CL formation were accompanied by the appearance of a third form of cAMP-dependent protein kinase, designated protein kinase 2. Protein kinase 2 was present within 2 h after hCG administration and persisted as a major form of cytosol cAMP-dependent protein kinase throughout the life span of CL. All three forms of protein kinase were inhibited by the heat-stable protein kinase inhibitor from rabbit skeletal muscle, possessed cAMP-binding activity, and were markedly stimulated by 10(-7) M cAMP. The activity of protein kinase 3 in CL of pregnancy, in corpora albicantia, and in interstitial tissue was markedly greater than that in follicles or in CL of pseudopregnancy, while the activity of protein kinase 2 remained relatively constant throughout the luteal life span. The iv injection of a luteolytic dose of hCG to 4-day pseudopregnant rabbits promoted no alterations of the protein kinase elution profile upon DEAE-cellulose chromatography of the luteal cytosol obtained 10 min to 3 days post-hCG injection. However, with dedifferentiation of corpora albicantia into interstitial tissue, the cAMP dependency of protein kinase 2 was reduced. The results indicate that the enzymatic activity and multiplicity of cAMP-dependent protein kinases in the cytosol of ovarian structures are subject to regulation by LH (hCG) and depend upon the various reproductive stages of the rabbit.
D000818:Animals; D006063:Chorionic Gonadotropin / Q000494:pharmacology*; D003307:Copulation; D003338:Corpus Luteum / Q000187:drug effects / Q000201:enzymology*; D003600:Cytosol / Q000201:enzymology; D004971:Estrus / Q000187:drug effects; D005260:Female; D007527:Isoenzymes / Q000378:metabolism; D007986:Luteinizing Hormone / Q000494:pharmacology*; D006080:Ovarian Follicle / Q000187:drug effects / Q000201:enzymology*; D010053:Ovary / Q000201:enzymology*; D010060:Ovulation / Q000187:drug effects*; D011247:Pregnancy; D011494:Protein Kinases / Q000378:metabolism*; D011817:Rabbits
D006063:Chorionic Gonadotropin; D007527:Isoenzymes; D007986:Luteinizing Hormone; D011494:Protein Kinases