Abstract:
:The stimulatory effects on Leydig cell testosterone secretion of a polypeptide(s) factor present in testicular interstitial fluid (IF) were compared with those of hCG and an LHRH agonist (LHRH-A). The actions of IF and LHRH-A were similar in showing (1) a delayed onset of action, (2) enhancement of testosterone production in response to a maximally stimulating concentration (5 nM) of hCG, and (3) near cessation of stimulation following their removal from the incubation medium. However, addition of an LHRH antagonist blocked only the actions of LHRH-A. Moreover, IF continued to stimulate testosterone production up to at least 20 h either on its own or in the presence of 5 nM hCG, whereas the stimulatory effects of LHRH-A disappeared beyond 6 h. IF was also able to enhance testosterone production in response to LHRH-A or in response to hCG + LHRH-A. IF enhanced testosterone production over 4-20 h in response to all doses of hCG and increasing concentrations of IF caused dose-dependent increments in the rate of hCG (5 nM) stimulated testosterone production. With submaximally stimulating doses of hCG or with LHRH-A alone, the stimulatory effect of IF was more or less additive, whereas with maximally stimulating doses of hCG the effect of IF was clearly synergistic. Thus, whereas the rate of testosterone production by Leydig cells in response to 5 nM hCG declined progressively from 4 to 20 h, addition of IF attenuated or prevented this decline. These findings have implications with respect to the physiological control of intratesticular testosterone levels and with respect to the regulation of steroidogenesis.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
Mol Cell Endocrinoljournal_title
Molecular and cellular endocrinologyauthors
Sharpe RMdoi
10.1016/0303-7207(85)90029-2subject
Has Abstractpub_date
1985-07-01 00:00:00pages
247-55issue
2-3eissn
0303-7207issn
1872-8057journal_volume
41pub_type
杂志文章abstract::Delphinidin possesses the highest chemopreventive activity among the six components of anthocyanidin that are pigments from fruits and vegetables giving them blue, purple or red colors. Although delphinidin has anti-carcinogenic and apoptotic effects in various cancers, little is known about its functional roles in ov...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2015.12.013
更新日期:2016-02-15 00:00:00
abstract::In the frog Xenopus laevis, vitellogenin is the major estrogen-induced protein in the liver. We have characterized an additional secreted protein, of 45,000 Da and designated Ep45, which is also responsive to estrogen treatment. Like vitellogenin, Ep45 is not normally found in the plasma nor synthesized by the liver o...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(87)90064-5
更新日期:1987-01-01 00:00:00
abstract::In order to differentiate whether activation of NaK-ATPase in thyroid thermogenesis is due to increased numbers of active 'sodium pump' units or due to a change in the kinetics of the enzyme, the effect of T3 on activation energy (Ea) of NaK-ATPase was determined in rat liver, kidney and brain. Injection of T3 produce...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(77)90107-1
更新日期:1977-02-01 00:00:00
abstract::Sterol 14 alpha-demethylase (CYP51) is the single cytochrome P450 (CYP) required for sterol biosynthesis in different phyla, and it is the most widely distributed P450 gene family being found in all biological kingdoms. It catalyzes the first step following cyclization in sterol biosynthesis such as removal of the 14 ...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.mce.2003.11.016
更新日期:2004-02-27 00:00:00
abstract::We have produced transgenic (TG) mice expressing under the ubiquitin C promoter either the glycoprotein hormone common alpha-subunit (C(alpha)) or human chorionic gonadotropin (hCG) beta-subunit. C(alpha) overexpression alone had no phenotypic effect, but the hCG(beta) expressing females, presenting with moderately el...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.mce.2004.10.013
更新日期:2005-04-29 00:00:00
abstract::Vitelline membrane outer layer protein 1 (VMO1), a basic protein present in the outer layer of the vitelline membrane of eggs, plays essential roles in separating the yolk from the egg white and preventing infection from bacteria by forming a barrier of fibrous layers in avian eggs. Although VMO1 is expressed in the o...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2014.10.015
更新日期:2015-01-05 00:00:00
abstract::The transforming growth factor beta (TGF-beta) superfamily includes several closely related peptides including the activins and inhibins. Since we recently reported that TGF-beta 1 and beta 2 are potent inducers of steroid 5 alpha-reductase (5 alpha R), we have now studied the effects of these other peptides using pri...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(94)03430-2
更新日期:1995-01-01 00:00:00
abstract::We have investigated protein kinase C (PKC) regulation by 1,25-(OH)2D3 in the rat osteosarcoma cell line ROS 17/2.8 since previous reports have implicated PKC in the 1,25-(OH)2D3-mediated regulation of osteocalcin gene expression (J. Biol. Chem. 267 (1992) 12562; Endocrinology 136 (1995) 5685). Here we report that 1,2...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/s0303-7207(01)00670-0
更新日期:2002-02-25 00:00:00
abstract::Diabetes-induced neutrophil NETosis impairs wound healing through neutrophil extracellular traps (NETs). Reactive oxygen species (ROS)-triggered activation of mitogen-activated protein kinase (MAPK) ERK1/2 and p38 is involved in NETosis. Hydrogen sulfide (H2S), an endogenous signaling molecule, accelerates diabetic wo...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2018.10.013
更新日期:2019-01-15 00:00:00
abstract::The molecular cloning and nucleotide sequencing of the gonadotropin-releasing hormone (GnRH) receptor represented an enhanced step in the experimental effort to understand this key molecule in the reproductive process at a cell and molecular level. A subsequent step in this broad effort is heterologous expression of t...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/s0303-7207(96)04003-8
更新日期:1997-03-28 00:00:00
abstract::Transcription elongation of many eukaryotic genes is regulated. Two negative transcription elongation factors, 5,6-dichloro-1-beta-D-ribofuranosylbenzimidazole (DRB) sensitivity-inducing factor (DSIF) and negative elongation factor (NELF) are known to stall collaboratively RNA polymerase II promoter proximally. We dis...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2010.01.020
更新日期:2010-05-05 00:00:00
abstract::A kallikrein-related protease was purified from rat ventral prostate cytosol by means of DEAE-Sepharose chromatography, followed by gel filtration on Sephadex G-100 and CM-cellulose chromatography. Antibodies raised in rabbits against the purified protease recognize two bands on immunoblots of prostatic cytosol: a 31,...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(89)90008-7
更新日期:1989-04-01 00:00:00
abstract::Advanced glycation end products (AGEs), formed at an accelerated rate under diabetes, play a role in inflammation and fibrosis in mesangial areas in diabetic nephropathy (DN). However, the transcriptional modulator that mediates the cellular response to AGEs remains largely obscure. Our goal was to determine whether m...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2017.07.014
更新日期:2018-01-15 00:00:00
abstract::Sex steroids have been known to play important roles in the homeostasis of human skin, but little is known about their biosyntheses in that tissue. In this study, we characterized the correlation between the concentrations of sex steroids and the expression levels of the factors involved in their synthesis or metaboli...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2012.05.005
更新日期:2012-10-15 00:00:00
abstract::Cell cholesterol metabolism is a tightly regulated process, dependent in part on activation of nuclear liver X receptors (LXRs) to increase expression of genes mediating removal of excess cholesterol from cells in the reverse cholesterol transport pathway. LXRs are thought to be activated predominantly by oxysterols g...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.mce.2012.07.013
更新日期:2013-04-10 00:00:00
abstract::Insulin receptor substrate-1 (IRS-1) is a protein expressed in 3T3-L1 adipocytes that is involved in most, if not all of the biological responses to insulin. Chronic exposure of these cells to insulin down-regulates IRS-1 by stimulating its degradation (Rice, K.M., Turnbow, M.A. and Garner, C.W. (1993) Biochem. Biophy...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(96)03875-0
更新日期:1996-08-30 00:00:00
abstract::The time- and dose-dependent effects of bovine activin A and bovine follicle stimulating hormone (FSH) suppressing protein (FSP) or follistatin on basal and FSH-induced steroidogenesis and inhibin production were studied in granulosa cells from immature, diethylstilbestrol (DES)-treated rats. In the presence of rat FS...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(90)90082-j
更新日期:1990-02-12 00:00:00
abstract::Many agrochemicals have endocrine disrupting properties. A subset of these chemicals is characterized as "estrogenic". In this review, we describe several distinct ways that chemicals used in crop production can affect estrogen signaling. Using three agrochemicals as examples (DDT, endosulfan, and atrazine), we illust...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.mce.2020.110860
更新日期:2020-12-01 00:00:00
abstract::Activins play a fundamental role in cell differentiation and development. Activin A signaling is mediated through a combination of activin type II receptors (ActRIIs) and the activin type IB receptor, ALK4. Signaling receptors of other activin isoforms remain to be elucidated. Here, we found that activin AB and activi...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2004.03.009
更新日期:2004-05-31 00:00:00
abstract::We previously demonstrated the interactions of different chemical compounds with estrogen receptors ERalpha and ERbeta and the androgen receptor (AR) using different reporter cell lines. In this study, we characterize the ERalpha, ERbeta and AR activity of different biphenyls using the same tools. We provide evidence ...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/s0303-7207(02)00094-1
更新日期:2002-07-31 00:00:00
abstract::Inhibin A and B are dimeric proteins capable of suppressing FSH both in vitro and in vivo. The principal form in the male is inhibin B which is produced in the testis and circulates to inhibit pituitary FSH secretion. Activin A, B and AB are dimeric proteins that share the same beta subunits with the inhibins but, in ...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章,评审
doi:10.1016/s0303-7207(99)00222-1
更新日期:2000-03-30 00:00:00
abstract::Oxytocin (OT) plays an important role in the onset of human labour by stimulating uterine contractions and promoting prostaglandin/inflammatory cytokine synthesis in amnion via oxytocin receptor (OTR) coupling. The OTR-antagonist, Atosiban, is widely used as a tocolytic for the management of acute preterm labour. We f...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2015.11.012
更新日期:2016-01-15 00:00:00
abstract::We examined the effects of growth hormone (GH), prolactin (PRL) and insulin-like growth factor-I (IGF-I) on DNA synthesis, and insulin-like growth factor binding protein 3 (IGFBP-3) gene expression, in a rat beta-cell line INS-1. GH and PRL were equally effective in increasing DNA synthesis and IGFBP-3 gene expression...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(95)03640-s
更新日期:1995-10-30 00:00:00
abstract::Valproic acid (VPA) has been shown to increase the reprogramming efficiency of induced pluripotent stem cells (iPSC) from somatic cells, but the mechanism by which VPA enhances iPSC induction has not been defined. Here we demonstrated that VPA directly activated Oct4 promoter activity through activation of the PI3K/Ak...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2013.12.008
更新日期:2014-03-05 00:00:00
abstract::The antiestrogen tamoxifen has been successfully used to control estrogen receptor (ER) and progesterone receptor positive breast cancer. However, the development of antiestrogen resistance is frequently observed in patients following long term treatment. We have studied the development of antiestrogen resistance in v...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(92)90104-e
更新日期:1992-12-01 00:00:00
abstract::The expression of the three genes encoding the components C1, C2 and C3 of prostatic binding protein (PBP) is under androgen control and restricted to the rat ventral prostate. The SstI-PvuII fragment of the first intron of the C3(1) gene displays two binding sites for ubiquitous transcription factors and one for a ti...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(93)90165-g
更新日期:1993-08-01 00:00:00
abstract::Proliferation of breast cancer cells is mediated by estrogen receptors (ER)-ERalpha and ERbeta. At present, contradictory observations complicate the understanding of involvement of ERbeta in breast cancer and functional definition of ERbeta as a prognostic marker. A stable expression of full length ERbeta was establi...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2007.05.012
更新日期:2007-08-15 00:00:00
abstract::Meiosis-activating sterol (MAS) has been shown to induce mouse oocytes cultured in the presence of hypoxanthine (HX) to resume meiosis. The present research was conducted to determine whether amphotericin B or ketoconazole (a promoter and an inhibitor of production of MAS), affected oocyte maturation. Mouse cumulus ce...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/s0303-7207(00)00223-9
更新日期:2000-06-01 00:00:00
abstract::Di-n-Butyl (DBP) and Di-(2-EthylHexyl) (DEHP) phthalates can leach from daily-use products resulting in environmental exposure. In male rodents, phthalate exposure results in reproductive effects. To evaluate effects on the immature primate testis, testis fragments from 6-month-old rhesus macaques were grafted subcuta...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2014.10.004
更新日期:2014-12-01 00:00:00
abstract::The cDNA encoding the bovine activin type II receptor has been cloned by reverse transcription-polymerase chain reaction (RT-PCR) amplification of a bovine testicular RNA preparation. Sequence comparisons of the bovine activin type II receptor with its human, mouse and rat homologues show strong evolutionary conservat...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(94)90179-1
更新日期:1994-12-01 00:00:00