Abstract:
:The degradation products generated from A14 and B26 125I-labelled insulins in liver endosomes in vivo and in vitro have been isolated by high-performance liquid chromatography and cleavages in the B chain have been identified by automated radiosequence analysis. In rats sacrificed various times after injection of each of the 125I-labelled insulins, two major degradation products slightly less hydrophobic than intact iodoinsulins were identified; these accounted, at 8 min. for about 45% (A14 125I-labelled insulin) and 15% (B26 125I-labelled insulin) of the total radioactivity recovered, respectively. The products generated from A14 125I-labelled insulin contained an intact A chain, whereas those generated from B26 125I-labelled insulin contained a B chain cleaved at the B16-B17 bond. With B26 125I-labelled insulin, two minor products, with cleavages at the B23-B24 and B24-B25 bonds, were also observed. In vivo chloroquine treatment did not alter the nature but caused a decrease in the amount of insulin degradation products associated with endosomes. When endosomal fractions isolated from iodoinsulin injected rats were incubated at 30 degrees C in isotonic KCl, a rapid degradation of iodoinsulin, maximal at pH 6, was observed. With A14 125I-labelled insulin, the two major degradation products identified in vivo were generated along with monoiodotyrosine, but with B26 125I-labelled insulin monoiodotyrosine was the main product formed. Addition of ATP, presumably by decreasing the endosomal pH, shifted the medium pH for maximal iodoinsulin degradation to about 7-8. These studies have allowed a direct identification of two previously suggested cleavage sites in the B chain. They have also shown that the degradation products generated in cell-free endosomes under conditions that promote endosomal acidification are similar to those identified in vivo.
journal_name
Mol Cell Endocrinoljournal_title
Molecular and cellular endocrinologyauthors
Clot JP,Janicot M,Fouque F,Desbuquois B,Haumont PY,Lederer Fdoi
10.1016/0303-7207(90)90142-usubject
Has Abstractpub_date
1990-09-10 00:00:00pages
175-85issue
3eissn
0303-7207issn
1872-8057journal_volume
72pub_type
杂志文章abstract::Using primary cultures of porcine Sertoli cells as a model, the effects of ovine prolactin (oPRL) on Sertoli cell function were investigated through FSH binding. PRL treatment (0.3-5 ng/ml) induced a dose-dependent increase (ED50 = 5.10(-11) M) of 125I-FSH binding to Sertoli cells to a maximal stimulation (about 2.5-f...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(96)03891-9
更新日期:1996-09-18 00:00:00
abstract::Adrenocortical tumor (ACT), a rare tumor with a heterogeneous presentation, incompletely understood pathogenesis, and generally poor prognosis, occurs in 1-2 people per million and is even more uncommon in the pediatric population. Such rare cancers are a challenge to clinical practice. Exchange of experience, informa...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.mce.2011.10.015
更新日期:2012-03-31 00:00:00
abstract::Testosterone is converted to the more biologically active androgen, dihydrotestosterone (DHT), by steroid 5alpha-reductase. Two isozymes of 5alpha-reductase, types 1 and 2, are abundantly expressed in the epididymis. DHT is the androgen found in the nuclei of epididymal cells and is essential for the maturation of spe...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.mce.2005.12.044
更新日期:2006-05-16 00:00:00
abstract::The regulation of heat shock protein 90 kDa (hsp90) by estradiol was analyzed in the rat ventromedial hypothalamus (VMH) and uterus by one-dimensional gel electrophoresis/Western blots. Protein from VMH and uterus (35 micrograms/sample) was resolved on 8% acrylamide gels, transferred to polyvinyldifluoride filters, an...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(92)90028-5
更新日期:1992-04-01 00:00:00
abstract::Non-alcoholic fatty liver disease (NAFLD) is associated with hepatic insulin resistance with the molecular basis of this association being not well understood. Here we studied the effect of hepatic triglyceride accumulation induced by postprandial triglyceride-rich lipoproteins (TGRL) on hepatic insulin sensitivity in...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2011.06.008
更新日期:2011-08-22 00:00:00
abstract::In the haematophagous insect, Rhodnius prolixus, a rapid diuresis following engorgement of vertebrate blood is under the control of two main diuretic hormones: a corticotropin-releasing factor (CRF)-related peptide andserotonin (5HT). A CAP2b (CAPA)-related peptide is involved in the termination of this diuresis, and ...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2009.11.004
更新日期:2010-04-12 00:00:00
abstract::Evidence is accumulating that environmental chemicals (ECs) including endocrine-disrupting compounds (EDCs) can alter female reproductive development, fertility and onset of menopause. While not as clearly defined as in the male, this set of abnormalities may constitute an Ovarian Dysgenesis Syndrome with at least som...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.mce.2011.10.021
更新日期:2012-05-22 00:00:00
abstract::Explants from the mammary gland of 6 lactating cows were cultured in M-199 medium containing insulin (1.0 micrograms/ml) and hydrocortisone (0.5 micrograms/ml) and supplemented with bPRL (0.2-1.0 micrograms/ml) or oGH (0.1, 0.5 and 2.5 micrograms/ml) or bGH or hGH (0.2 and 1.0 micrograms/ml). It was found that neither...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(83)90165-x
更新日期:1983-12-01 00:00:00
abstract::Studies were performed to evaluate the relationships between the effects of angiotensin II on calcium metabolism and cytosolic free calcium concentration in primary monolayer cultures of bovine adrenal glomerulosa cells. As noted previously (Kramer (1988) Am. J. Physiol. (in press], angiotensin II produced rapid dose-...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(88)90179-7
更新日期:1988-12-01 00:00:00
abstract::Embryo implantation requires a precise synchronism between the receptive uterus and activated blastocyst and is regulated by complicated molecular networks. Although many implantation-related genes have been identified, the crosstalk among them is still unknown. Snail, a transcription repressor, plays a central role d...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2013.08.011
更新日期:2013-12-05 00:00:00
abstract::Trophoblast cells produce several inmmuneregulators like the Vasoactive Intestinal Peptide (VIP) and P4 targeting multiple circuits, and also display an intese phagocytic ability allowing embryo implantation in a tolerogenic context. Here, we explored whether P4 and VIP- crosstalk modulates trophoblast cell function, ...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2017.01.022
更新日期:2017-03-05 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::Presently, a growing interest is focused on the origins of the "Metabolic Syndrome", a cluster of several metabolic disorders linking obesity, dyslipidemia, hypertension and type 2 diabetes mellitus. Clearly, genetic predisposition and deleterious lifestyle, including low physical activity and hypercaloric alimentatio...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.mce.2009.02.026
更新日期:2009-05-25 00:00:00
abstract::Rapid, nongenomic in vitro effects of aldosterone on intracellular electrolytes, cell volume and the sodium-proton antiporter have been found in human mononuclear leukocytes (HML), as have related membrane receptors. In the present study, binding of 125I-labeled aldosterone to plasma membrane preparations from pig kid...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(94)90027-2
更新日期:1994-03-01 00:00:00
abstract::The family of G protein-coupled receptors (GPCRs) is the largest class of membrane proteins and an important drug target due to their role in many (patho)physiological processes. Besides small molecules, GPCRs can be targeted by biologicals including antibodies and antibody fragments. This review describes the use of ...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.mce.2019.01.021
更新日期:2019-03-15 00:00:00
abstract::Fibrosis is one of the key pathological features of airway remodeling in asthma. In the normal airway the amount of collagen and other extracellular matrix components is kept in equilibrium by regulation of synthesis and degradation. In asthma this homeostasis is disrupted due to genetic and environmental factors. In ...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.mce.2012.01.007
更新日期:2012-04-04 00:00:00
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 produc...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(85)90029-2
更新日期:1985-07-01 00:00:00
abstract::Gonadotropin-releasing hormone (GnRH) neurons coordinate reproduction. However, whether GnRH neurons directly sense free fatty acids (FFAs) is unknown. We investigated the individual effects of the FFAs docosahexaenoic acid (DHA), palmitate, palmitoleate, and oleate (100 μM each) on Gnrh mRNA expression in the mHypoA-...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2016.02.019
更新日期:2016-05-05 00:00:00
abstract::Thyrotropin-releasing hormone (TRH) stimulates maximally both the release of previously synthesized prolactin and the de novo synthesis of prolactin by GH4C1 rat pituitary cells at concentrations less than those necessary to fully occupy the TRH receptor at equilibrium. We have examined the dependency of maximal TRH-e...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(85)90081-4
更新日期:1985-12-01 00:00:00
abstract::Some environmental contaminants and pharmaceuticals increase the incidence of uterine tumors in toxicological studies with rats. These tumors can result from a hormonal imbalance due to rat-specific disrupted pituitary prolactin regulation, and are therefore of questionable relevance for humans. In this study we compa...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2019.110520
更新日期:2019-10-01 00:00:00
abstract::When measured in vitro using human placental microsomal preparations, the aromatization of 16alpha-hydroxytestosterone to estriol and androstenedione to estrone and estradiol proceeds at almost identical initial rates. Important differences between 16alpha-hydroxytestosterone and adrostenedione aromatization are evide...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(76)90010-1
更新日期:1976-12-01 00:00:00
abstract::Relaxin is a peptide hormone which consists of two polypeptide chains that are synthesized as a B-chain/C-peptide/A-chain precursor. We have used the polymerase chain reaction (PCR) to isolate and clone a relaxin-like cDNA from sheep placental RNA. This cDNA and two sheep genomic clones were characterised by nucleotid...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(93)90250-n
更新日期:1993-02-01 00:00:00
abstract::The major source for dehydroepiandrosterone (DHEA) and its sulphate compound DHEA-S is the inner zone of the adrenal cortex, which is in direct contact to adrenomedullary chromaffin cells. Due to their close proximity, direct interactions of DHEA and DHEA-S with chromaffin cells during adrenal gland development and th...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2008.10.026
更新日期:2009-03-05 00:00:00
abstract::We studied the functional properties of hepatic glucagon receptors during rat development. Glucagon binding to liver membranes and isolated hepatocytes was significantly less in foetuses and weaning rats than in adult animals, reflecting changes in the number of receptors rather than any change in receptor affinity fo...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(87)90208-5
更新日期:1987-02-01 00:00:00
abstract::Although well-established, the underlying mechanisms involved in obesity-related plasma adiponectin decline remain elusive. Oxidative stress is associated with obesity and insulin resistance and considered to contribute to the progression toward obesity-related metabolic disorders. In this study, we investigated the e...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2011.10.027
更新日期:2012-02-26 00:00:00
abstract::Foxp3+ regulatory T cells (Tregs) in lymphocytes facilitate the thyroid tumor growth and invasion. Very limited information is available on Foxp3 expression in thyroid cancer cells and its function is totally unknown. This study demonstrated that Foxp3 expression was increased in thyroid cancer cells. Inhibition of Fo...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2014.10.006
更新日期:2015-01-05 00:00:00
abstract::Cannabinoids, the main active components of marijuana, have been shown to exert different adverse effects on male reproduction both in vertebrates and invertebrates. The main effects of endocannabinoids, a particular group of endogenously produced cannabinoids, in sperm are the inhibition of motility, capacitation and...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.mce.2008.02.013
更新日期:2008-04-16 00:00:00
abstract::The involvement of cyclic-AMP (cAMP) as a potential second messenger in the neurohormonal control of ovarian steroidogenesis was investigated in the adult female blowfly Phormia regina. Individual measurements of ovarian cAMP concentrations and of ovarian biosynthesis of ecdysteroids, stimulated after a protein meal, ...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/s0303-7207(00)00312-9
更新日期:2000-10-25 00:00:00
abstract::We hypothesized that DNA methylation is involved in human adrenal functional zonation. mRNAs expression and methylation pattern of RARB, NR4A1 and HSD3B2 genes in human adrenal tissues (HAT) and in pediatric virilizing adrenocortical tumors (VAT) were analyzed. For analysis of the results samples were divided into 3 a...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/j.mce.2016.09.024
更新日期:2017-02-05 00:00:00
abstract::Autodigestion of nuclei isolated from the androgen-dependent Shionogi mouse mammary carcinoma revealed the presence of endogenous endonuclease activity which was stimulated by Ca2+ and Mg2+ and generated a repeating pattern of DNA fragments with an average monomeric size of 179 base pairs. The nuclear concentration of...
journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(86)90144-9
更新日期:1986-05-01 00:00:00