Abstract：
:Human breast cancer cells selected for multidrug resistance frequently overexpress ligands and receptors in the epidermal growth factor (EGF) receptor family. To determine whether this overexpression contributes to the drug resistant phenotype, EGF receptor transfected ZR75B human breast cancer cells were examined. Two EGF receptor overexpressing clones were evaluated: clone 11 with > 1 x 10(6) sites, and clone 13 with 310,000 receptor sites/cell. These were compared with clone 2-neo, which was transfected with the neomycin gene only and contained 43,000 receptor sites/cell. The EGF receptor overexpressing clones and the neo transfected control clone displayed comparable growth rates. Cytotoxicity analyses were performed with doxorubicin, vinblastine, cisplatin and 5-fluorouracil to determine the sensitivity of the clones to antineoplastic drugs. The EGF receptor overexpressing clones were found to be 1.5-5.6 times more resistant to the four drugs tested. This increase in the IC50 conferred a selective advantage when grown in the presence of 2, 3 and 6 ng/ml doxorubicin. Clone 13 cells overtook a mixed population which began with clone 2-neo comprising 95% of the cells. Clone 2-neo remained the dominant clone in the absence of drug. Finally, after long-term selection of the clones with 6 ng/ml doxorubicin, clone 2-neo became fourfold more resistant than the unselected clone 2-neo, a level which was comparable to that found in the EGF receptor overexpressing clones 11 and 13. No additional increase in resistance was observed for these clones, suggesting that clone 2-neo had developed additional resistance mechanisms.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
Mol Cell Endocrinoljournal_title
Molecular and cellular endocrinologyauthors
Dickstein BM,Wosikowski K,Bates SEdoi
10.1016/0303-7207(95)03535-fsubject
Has Abstractpub_date
1995-04-28 00:00:00pages
205-11issue
1-2eissn
0303-7207issn
1872-8057journal_volume
110pub_type
杂志文章abstract：:Estrogen plays a major role in bone mineral homeostasis, maintaining a balance between bone formation and bone resorption not only in women but also in men. Extraglandular aromatization of circulating androgen is the major source of estrogen in post-menopausal women and men. In order to assess the capacity of bone cel...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/s0303-7207(98)00069-0
更新日期：1998-04-30 00:00:00
abstract：:Although earlier studies focused on the hormonal regulation of antral and preovulatory follicles, recent studies indicate the importance of the hormonal control mechanism for preantral follicles. The endocrine hormone FSH is not only a survival factor for early antral follicles but also a potent growth and differentia...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章,评审
doi：10.1016/s0303-7207(99)00245-2
更新日期：2000-05-25 00:00:00
abstract：:The endometrial expression of the gene encoding porcine uteroferrin (UF), during pregnancy is presumed to be mediated by cis-regulatory regions distinct from those that confer its limited expression to other mammalian tissues and cell types. In the present study, chimeric DNA constructs of native and progressive 5' de...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/0303-7207(94)03456-4
更新日期：1995-02-27 00:00:00
abstract：:We have previously reported that LHCGR expression in the ovary is regulated through a post-transcriptional mechanism involving an mRNA binding protein designated as LRBP, which is regulated, at least in part, by a non-coding RNA, miR-122. Our present study examined the regulatory role of miR-122 in FSH-induced LHCGR e...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/j.mce.2016.12.002
更新日期：2017-02-15 00:00:00
abstract：:It is widely accepted that obesity is a major risk factor for the development of atherosclerosis. In this context, adipose tissue produces a variety of adipokines and releases free fatty acids, contributing to a chronic-low grade inflammation state implicated in vascular complications. In this study, we investigated t...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/j.mce.2012.06.010
更新日期：2012-10-15 00:00:00
abstract：:Peritubular stem Leydig cells (SLCs) have been identified from rat testicular seminiferous tubules. However, no stem cells for peritubular myoid cells have been reported in the adult testis so far. In the present study, we tested the hypothesis that the peritubular SLCs are multipotent and able to form either Leydig o...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/j.mce.2021.111179
更新日期：2021-01-27 00:00:00
abstract：:The rapid effects of steroids on spermatozoa have been demonstrated for the first time two decades ago. Progesterone (P), which is present throughout the female genital tract with peaks of levels in the cumulus matrix surrounding the oocyte, stimulates several sperm functions, including hyperactivation and acrosome re...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章,评审
doi：10.1016/j.mce.2009.02.006
更新日期：2009-09-24 00:00:00
abstract：:Activating mutations in the follicle-stimulating hormone (FSH) receptor (FSHR) gene are rarely detected due to the absence of a clearly defined phenotype, particularly in men. We here report the biochemical features of a novel mutation in the first extracellular loop of the FSHR. The mutation (N431I) was detected in a...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/j.mce.2012.08.011
更新日期：2012-11-25 00:00:00
abstract：:The outcome and reproductive function were examined among patients with malignant ovarian germ cell tumors treated since 1980. Between 1980 and 2001, fertility-sparing surgery was performed in 26 women, 23 of whom received adjuvant chemotherapy. With a median follow-up of 66.6 months, all patients have been alive, wit...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/s0303-7207(03)00072-8
更新日期：2003-04-28 00:00:00
abstract：:Exploitation of estrogen's vasculoprotective properties in drug design is difficult due to its adverse effects on endometrium and breast. Selective estrogen receptor modulators (SERM) act as estrogen agonists in some tissues but are anti-estrogenic in others. We investigate here whether tamoxifen, raloxifene, and two ...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/j.mce.2004.08.004
更新日期：2004-11-30 00:00:00
abstract：:17Beta-hydroxysteroid dehydrogenases (17beta-HSDs) belong to the family of short chain dehydrogenases/reductases (SDRs) and aldoketo-reductases (AKRs). Some of the enzymes were discovered and named due to their enzymatic activity on steroid substrates or according to their sequence homology to other 17beta-HSDs. Durin...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章,评审
doi：10.1016/j.mce.2005.11.031
更新日期：2006-03-27 00:00:00
abstract：:In the retina, peptidergic signalling participates in multiple circuits of visual information processing. The neuropeptide somatostatin (SRIF) is localised to amacrine cells and, in some instances, in a subset of ganglion cells. The variegated expression patterns of SRIF receptors (sst(1)-sst(5)) and the variety of si...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章,评审
doi：10.1016/j.mce.2007.12.009
更新日期：2008-05-14 00:00:00
abstract：:1,25-Dihydroxyvitamin D (1,25(OH)(2)D) plays a critical role in calcium and phosphorus (Pi) metabolism, bone growth, and tissue differentiation. The synthesis of 1,25(OH)(2)D in the proximal renal tubule is the primary determinant of its circulating concentration and is mediated by the mitochondrial enzyme, 25-hydroxy...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章,评审
doi：10.1016/j.mce.2011.08.030
更新日期：2011-12-05 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：:Induction of prolactin hepatic receptors in the male rat by exogenous prolactin and the possible involvement of prostaglandins in this process were studied. When ovine prolactin 500 microgram/kg was administered sc in saline containing 10% PVP (polyvinylpyrrolidone), twice daily for 6.5 days and the rats killed 48 h a...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/0303-7207(81)90050-2
更新日期：1981-02-01 00:00:00
abstract：:Local mediator prostaglandins and bradykinin are involved in inflammation and pain. We explored bradykinin effects on prostaglandin E2 (PGE2) release from fibroblasts derived from human skeletal muscular biopsies. Bradykinin induced PGE2 release through bradykinin B2 receptors, since PGE2 release was blocked by the br...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/j.mce.2020.110771
更新日期：2020-05-01 00:00:00
abstract：:17Beta hydroxysteroid dehydrogenase type 7 (HSD17B7) was described to possess dual functionality in steroidogenesis as well as in postsqualene cholesterol biosynthesis in vitro. In order to gain insight into the transcriptional regulation, and thereby into in vivo functionality of HSD17B7, we analyzed and compared the...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/j.mce.2005.10.016
更新日期：2006-03-27 00:00:00
abstract：:Parathyroid hormone-related protein (PTHrP) is reportedly produced in normal islets and insulinomas. PTHrP induces differentiation in some cell-types and growth in others. We examined whether PTHrP production is greater in well-differentiated or growing beta cells and whether PTHrP induces differentiation or growth in...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/s0303-7207(01)00482-8
更新日期：2001-09-01 00:00:00
abstract：:Cytochrome b(5) (cyt-b(5)) is essential for the regulation of steroidogenesis and as such has been implicated in a number of clinical conditions. It is well documented that this small hemoprotein augments the 17,20-lyase activity of cytochrome P450 17α-hydroxylase/17,20-lyase (CYP17A1). Studies have revealed that this...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章,评审
doi：10.1016/j.mce.2012.11.020
更新日期：2013-05-22 00:00:00
abstract：:Somatostatin (SST) regulates multiple biological processes via five genetically distinct, G-protein coupled receptors. Clinical interest in therapy for neuroendocrine and metabolic disorders has resulted in the development of new tools for exploring the function of somatostatin receptors (SSTRs). The development of hi...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章,评审
doi：10.1016/j.mce.2008.02.007
更新日期：2008-05-14 00:00:00
abstract：:The first exon of the human androgen receptor (AR) contains a translated CAG (poly-glutamine) repeat. The repeat length is polymorphic in the normal population ranging from 8 to 35 repeats. Expansions to over 40 repeats lead to spinal bulbar muscular atrophy (SBMA), a late onset neurodegenerative disease. The repeat i...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章,评审
doi：10.1016/s0303-7207(02)00104-1
更新日期：2002-07-31 00:00:00
abstract：:Granulosa cell-derived inhibin A (a dimer of alpha- and beta A-subunits), activin A (a homodimer of beta A-subunits) and the activin-binding protein follistatin are important regulators of human ovarian steroidogenesis. We here studied how 8-bromo-cAMP (8br-cAMP), a protein kinase A activator, and 12-O-tetradecanoylph...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/0303-7207(96)03842-7
更新日期：1996-07-23 00:00:00
abstract：:Transforming growth factor beta (TGF beta) caused a dose-dependent increase in both basal and follicle-stimulating hormone (FSH)-stimulated inhibin production by rat granulosa cells in culture. The TGF beta dose-response curve in the absence of FSH was approximately parallel to that in the presence of either a minimal...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/0303-7207(88)90150-5
更新日期：1988-08-01 00:00:00
abstract：:The involvement of continuous protein synthesis in the mechanisms of crustacean steroidogenesis was investigated using crayfish molting glands (Y-organs). During intermolt, Y-organ steroidogenic activity is low. Eyestalk ablation initiates premolt which is characterized by a rapid increase in the production of ecdyste...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/0303-7207(95)03489-t
更新日期：1995-03-01 00:00:00
abstract：:Procedures have been developed which provide simple means of determining binding constants of steroid receptors for glucocorticoids in mouse lymphoid cell lines and of characterizing the interaction of the steroid--receptor complex with the nucleus. An average of 70% of the steroid--receptor complexes is found associa...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/0303-7207(78)90124-7
更新日期：1978-04-01 00:00:00
abstract：:Skeletal muscle is the major site of postprandial glucose disposal and augmenting glucose uptake into this tissue may attenuate insulin resistance that precedes type 2 diabetes mellitus. Here, we investigated the effect of pongamol, an identified lead molecule from the fruits of Pongamia pinnata, on glucose uptake and...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/j.mce.2011.03.023
更新日期：2011-06-06 00:00:00
abstract：:Yin Yang 1 (YY1) is an ubiquitously distributed transcription factor that belongs to the GLI-Kruppel class of zinc finger proteins. The mechanism by which YY1 regulates adipocyte differentiation remains unclear. In this study, we investigated the functional role of YY1 during adipocyte differentiation. During the earl...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/j.mce.2015.06.035
更新日期：2015-09-15 00:00:00
abstract：:Experimental data indicate that metal ions such as Na(+), Ca(2+) and Mg(2+), which are present in millimolar concentrations in the extracellular environment, modulate binding of ligands to plasma membrane receptors. Here, we briefly review structural studies that demonstrate that various types of ligands, including pe...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章,评审
doi：10.1016/j.mce.2005.11.023
更新日期：2006-02-26 00:00:00
abstract：:This study demonstrates that a single subcutaneous injection of gonadotrophin-releasing hormone (GnRH) (60 ng) to GnRH-deficient (hpg) male mice causes a doubling of pituitary GnRH receptors (GnRH-R). No change in GnRH-R occurs during the time of LH release (15-60 min) or up until 4 h post-GnRH. Between 4 and 12 h the...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/0303-7207(84)90045-5
更新日期：1984-09-01 00:00:00
abstract：:The effect of thyroid status on the postnatal development of the two molecular forms of Na+,K+-ATPase, distinguished kinetically on the basis of their ouabain sensitivity, was examined in rat brain. Hypothyroidism induced by PTU from day 1 postnatally significantly reduced the Na+,K+-ATPase activity in cerebellum (22-...
journal_title：Molecular and cellular endocrinology
pub_type： 杂志文章
doi：10.1016/0303-7207(85)90170-4
更新日期：1985-05-01 00:00:00
