Abstract:
:Translocation of protein kinase C (PKC) from the cytosol to the plasma membranes is believed to reflect activation of the enzyme. We have studied translocation of PKC in lactotroph-enriched anterior pituitary cell cultures by measuring the incorporation of gamma-32P from [gamma-32P]ATP into a synthetic peptide substrate, MBP4-14, and by immunoblotting of PKC isozymes. Using cells permeabilized with digitonin the effects of PKC cofactors on the distribution of the enzyme were studied. Ca2+ (50 nM) and dioctanoyl-sn-glycerol had no effect when tested alone, but in combination they caused a redistribution of PKC from the soluble to the particulate fraction. Arachidonic acid needed Ca2+ to induce translocation of PKC, while being ineffective under Ca(2+)-free conditions. Western blot analysis of partly purified PKC from lactotroph-enriched pituitary cells revealed the presence of the alpha, beta, delta and zeta isozymes. 12-O-Tetradecanoylphorbol 13-acetate (TPA) and substance P displayed different patterns of redistribution of PKC isozyme immunoreactivity from soluble to membrane-attached forms. Thus, TPA induced time- and dose-dependent (mean effective concentration (EC50) = 1 nM) translocation of the alpha, beta and delta species, while substance P stimulated time- and dose-dependent (EC50 = 1 nM) redistribution of the alpha and beta isozymes. zeta subtype immunoreactivity could not be translocated by either agonist; neither could the immunoreactivity of zeta be down-regulated by long-term treatment (24 h) with TPA. The results indicate that simultaneous activation of phospholipases C and A2 induces a synergistic activation of PKC. Finally it is suggested that substance P may exert some of its effects in lactotrophs by translocation of PKC isozymes alpha and beta.
journal_name
J Mol Endocrinoljournal_title
Journal of molecular endocrinologyauthors
Mau SE,Saermark T,Vilhardt Hdoi
10.1677/jme.0.0120293subject
Has Abstractpub_date
1994-06-01 00:00:00pages
293-302issue
3eissn
0952-5041issn
1479-6813journal_volume
12pub_type
杂志文章abstract::The mouse knockout of the estrogen receptor alpha (ERalpha) gene, known as alphaERKO, has been extensively used for several years to study the role and function of ERalpha. Residual estradiol binding capacity in uterine tissue of 5-10% raised doubts if this knockout is a genuine null mutation of ERalpha. Although alte...
journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/jme.0.0290281
更新日期:2002-12-01 00:00:00
abstract::The effect of steroid hormone treatment on coho salmon (Oncorhynchus kisutch) was examined. The cDNAs for coho salmon FSH beta and LH beta subunits were cloned and sequenced using reverse transcriptase PCR. Northern blot analysis revealed that a single transcript of 1 kb for each of these subunits was present in the p...
journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/jme.0.0210291
更新日期:1998-12-01 00:00:00
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journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/jme.0.0130347
更新日期:1994-12-01 00:00:00
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journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/jme.0.0120013
更新日期:1994-02-01 00:00:00
abstract::The contribution of hypothalamic appetite-regulating peptides to further hyperphagia accompanying the course of lactation in rats was investigated by using PCR array and real-time PCR. Furthermore, changes in the mRNA expression for appetite-regulating peptides in the hypothalamic arcuate nucleus (ARC) were analyzed a...
journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
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更新日期:2014-01-30 00:00:00
abstract::Decreased suppressors of cytokine signaling (SOCS) activity in human gestational tissues may play a part in the onset/progression of term labor. Since SOCS proteins negatively regulate cytokine-mediated inflammatory processes, we hypothesized that SOCS proteins are elevated in gestational tissues from spontaneous pret...
journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/jme.1.01767
更新日期:2005-08-01 00:00:00
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journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/jme.0.0130187
更新日期:1994-10-01 00:00:00
abstract::Follicle-stimulating hormone (FSH) plays fundamental roles in male and female fertility. FSH is a heterodimeric glycoprotein expressed by gonadotrophs in the anterior pituitary. The hormone-specific FSHβ-subunit is non-covalently associated with the common α-subunit that is also present in the luteinizing hormone (LH)...
journal_title:Journal of molecular endocrinology
pub_type: 杂志文章,评审
doi:10.1530/JME-17-0308
更新日期:2018-04-01 00:00:00
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pub_type: 杂志文章
doi:10.1677/jme.0.0270145
更新日期:2001-10-01 00:00:00
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journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/jme.0.0240377
更新日期:2000-06-01 00:00:00
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journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/jme.0.0140209
更新日期:1995-04-01 00:00:00
abstract::Natriuretic peptides (NPs) have been reported to have critical roles in follicular development and oocyte maturation in rodents. This study aimed to extend our current understanding of NP-mediated signalling pathways and mechanisms of action in the follicles of a monovulatory species. Ovine granulosa cells (GCs) and t...
journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1530/JME-20-0034
更新日期:2020-05-01 00:00:00
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journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1530/JME-10-0065
更新日期:2011-03-03 00:00:00
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journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/jme.0.0170237
更新日期:1996-12-01 00:00:00
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journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/jme.0.0110325
更新日期:1993-12-01 00:00:00
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journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/jme.0.0300287
更新日期:2003-06-01 00:00:00
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journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1530/JME-14-0051
更新日期:2014-04-28 00:00:00
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journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/jme.0.0010117
更新日期:1988-09-01 00:00:00
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journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/jme.0.0290175
更新日期:2002-10-01 00:00:00
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journal_title:Journal of molecular endocrinology
pub_type: 杂志文章,评审
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journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/jme.0.0120155
更新日期:1994-04-01 00:00:00
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journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/JME-08-0154
更新日期:2009-04-01 00:00:00
abstract::Reproductive function in mammals is regulated by the pituitary gonadotropins luteinizing hormone (LH) and follicle-stimulating hormone (FSH). LH and FSH are secreted by the gonadotrope cell and act on the gonad in a sequential and synergistic manner to initiate sexual maturation and maintain cyclic reproductive functi...
journal_title:Journal of molecular endocrinology
pub_type: 杂志文章,评审
doi:10.1677/jme.1.01600
更新日期:2004-12-01 00:00:00
abstract::Genetic studies have reported association of a polyglycine-encoding GGN repeat in exon 1 of the androgen receptor (AR) gene with common human traits. The polyglycine tract is located in the transactivating domain of the AR protein, suggesting an effect of repeat length on receptor function. Here, we compare the functi...
journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/JME-06-0072
更新日期:2007-07-01 00:00:00
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journal_title:Journal of molecular endocrinology
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doi:10.1677/jme.0.0300163
更新日期:2003-04-01 00:00:00
abstract::Cellular changes that affect the androgen receptor (AR) can cause prostate cancer to transition from androgen dependent to androgen independent, which is usually lethal. One common change in prostate tumors is overexpression of the AR, which has been shown to lead to androgen-independent growth of prostate cancer cell...
journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/JME-07-0158
更新日期:2008-07-01 00:00:00
abstract::Glucocorticoid and androgen receptors have been shown to function through the same palindromic glucocorticoid response element (GRE) and yet have differential effects on gene transcription. In this study, we examined the functional and structural relationship of the androgen and glucocorticoid receptors with the andro...
journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/jme.0.0220313
更新日期:1999-06-01 00:00:00
abstract::Differences in binding and structural properties of ovine testicular FSH and LH receptors were investigated. The ovine FSH receptor did not discriminate between FSH of different species, although equine FSH was more reactive. In the same tissue, however, the LH receptor showed marked preference for ovine and bovine LH...
journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/jme.0.0060291
更新日期:1991-06-01 00:00:00
abstract::The human progesterone receptor (PR) is a ligand-dependent transcription factor and two isoforms, (PRA and PRB), can be distinguished. PROGINS, a PR polymorphic variant, affects PRA and PRB and acts as a risk-modulating factor in several gynaecological disorders. Little is known about the functional consequences of th...
journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1677/jme.1.02170
更新日期:2007-02-01 00:00:00
abstract::Progesterone's ability to maintain pregnancy in eutherian mammals highlighted this steroid as the 'hormone of pregnancy'. It was the unique 'pro-gestational' bioactivity of progesterone that enabled eventual purification of this ovarian steroid to crystalline form by Willard Myron Allen in the early 1930s. While a fun...
journal_title:Journal of molecular endocrinology
pub_type: 杂志文章
doi:10.1530/JME-19-0212
更新日期:2020-07-01 00:00:00