Neomycin mimics the effects of high extracellular calcium concentrations on parathyroid function in dispersed bovine parathyroid cells.

Abstract:

:We examined the effects of the polycationic antibiotic, neomycin, on the function of dispersed bovine parathyroid cells. Neomycin caused a reversible, dose-dependent inhibition of low calcium (Ca++)-stimulated PTH release, with half-maximal inhibition at 30 microM. Maximal inhibition (with 200 microM neomycin) was not additive with the suppressive effects of high (2 mM) Ca++. Neomycin also inhibited dopamine-stimulated cAMP accumulation by 90-98% at 100-200 microM, with a half-maximal effect at 40-50 microM. This action was reversible and was blocked by preincubating the cells overnight with 0.5 microgram/ml pertussis toxin. In addition to its suppressive effects on cAMP metabolism and PTH release, neomycin stimulated the accumulation of inositol phosphates and produced a transient increase in the cytosolic Ca++ concentration (Cai) in fura-2-loaded parathyroid cells. The neomycin-evoked spike in Cai persisted despite removal of extracellular Ca++, indicating that it arises from intracellular Ca++ stores. Exposure of cells to elevated magnesium (Mg++) concentrations elicited a similar spike in Cai but blocked the spike in Cai in response to subsequent addition of neomycin and vice versa. Thus, Mg++ and neomycin mobilize Ca++ from the same intracellular store(s). These results indicate that a polycation, neomycin, closely mimics the effects of polyvalent cations on parathyroid function, suggesting that both agents regulate parathyroid function via similar biochemical pathways.

journal_name

Endocrinology

journal_title

Endocrinology

authors

Brown EM,Butters R,Katz C,Kifor O

doi

10.1210/endo-128-6-3047

subject

Has Abstract

pub_date

1991-06-01 00:00:00

pages

3047-54

issue

6

eissn

0013-7227

issn

1945-7170

journal_volume

128

pub_type

杂志文章
  • Age-dependent changes in beta-adrenergic receptor subtypes and adenylyl cyclase activation in adipocytes from Fischer 344 rats.

    abstract::Epididymal adipocytes were isolated from Fischer 344 rats aged 3, 6, 12, and 24 months, to study the mechanisms responsible for age-dependent diminution in cellular adrenergic responsiveness. Messenger RNA (mRNA) levels for the beta 1-, beta 2-, and beta 3-adrenergic receptors (ARs) were compared across age groups and...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/endo.136.5.7720650

    authors: Gettys TW,Rohlfs EM,Prpic V,Daniel KW,Taylor IL,Collins S

    更新日期:1995-05-01 00:00:00

  • Regulation of steroidogenesis and steroidogenic acute regulatory protein in R2C cells by DAX-1 (dosage-sensitive sex reversal, adrenal hypoplasia congenita, critical region on the X chromosome, gene-1).

    abstract::In the present study, steroidogenesis in two different Leydig tumor cell lines was compared. One, the MA-10 mouse tumor cell line, produces steroids and the steroidogenic acute regulatory (StAR) protein only when stimulated by trophic hormones and cAMP analogs. The other, the R2C rat tumor cell line, produces steroids...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/en.2004-0941

    authors: Jo Y,Stocco DM

    更新日期:2004-12-01 00:00:00

  • Inhibition of transcription affects synthesis of steroidogenic acute regulatory protein and steroidogenesis in MA-10 mouse Leydig tumor cells.

    abstract::Hormonal induction of steroidogenesis in the adrenal and gonads is dependent on the synthesis and function of the steroidogenic acute regulatory protein (StAR). As a first approach to investigate the role of translation in the control of StAR expression, we examined StAR protein synthesis and steroid production in MA-...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/endo.138.11.5535

    authors: Clark BJ,Combs R,Hales KH,Hales DB,Stocco DM

    更新日期:1997-11-01 00:00:00

  • Tamoxifen represses miR-200 microRNAs and promotes epithelial-to-mesenchymal transition by up-regulating c-Myc in endometrial carcinoma cell lines.

    abstract::Although tamoxifen (TAM), a selective estrogen receptor modulator, has been widely used in the treatment of hormone-responsive breast cancer, its estrogen-like effect increases the risk of endometrial cancer. However, the molecular mechanisms of TAM-induced endometrial carcinoma still remain unclear. In this report, w...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/en.2012-1607

    authors: Bai JX,Yan B,Zhao ZN,Xiao X,Qin WW,Zhang R,Jia LT,Meng YL,Jin BQ,Fan DM,Wang T,Yang AG

    更新日期:2013-02-01 00:00:00

  • Role played by brainstem neurons in regulating testosterone secretion via a direct neural pathway between the hypothalamus and the testes.

    abstract::We previously reported anatomical and functional evidence for a direct, inhibitory neural pathway that regulates testosterone (T) secretion independently of the pituitary. This pathway is activated by the intracerebroventricular (icv) administration of agents that stimulate stress responses, such as IL-1beta, corticot...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/en.2005-1358

    authors: Selvage DJ,Parsons L,Rivier C

    更新日期:2006-06-01 00:00:00

  • Developmental control of plasma leptin and adipose leptin messenger ribonucleic acid in the ovine fetus during late gestation: role of glucocorticoids and thyroid hormones.

    abstract::In developed countries, the increasing incidence of obesity is a serious health problem. Leptin exposure in the perinatal period affects long-term regulation of appetite and energy expenditure, but control of leptin production in utero is unclear. This study investigated perirenal adipose tissue (PAT) and placental le...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/en.2007-0310

    authors: O'Connor DM,Blache D,Hoggard N,Brookes E,Wooding FB,Fowden AL,Forhead AJ

    更新日期:2007-08-01 00:00:00

  • KT5823 differentially modulates sodium iodide symporter expression, activity, and glycosylation between thyroid and breast cancer cells.

    abstract::Na(+)/I(-) symporter (NIS)-mediated iodide uptake into thyroid follicular cells serves as the basis of radioiodine therapy for thyroid cancer. NIS protein is also expressed in the majority of breast tumors, raising potential for radionuclide therapy of breast cancer. KT5823, a staurosporine-related protein kinase inhi...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/en.2010-0782

    authors: Beyer S,Lakshmanan A,Liu YY,Zhang X,Wapnir I,Smolenski A,Jhiang S

    更新日期:2011-03-01 00:00:00

  • Novel regulation of pregnant human myometrial smooth muscle cell gap junctions by human chorionic gonadotropin.

    abstract::Human myometrium contains hCG/LH receptors. There are fewer of these receptors during labor compared to no labor at preterm or term deliveries. Exogenous hCG can directly inhibit oxytocin-stimulated human myometrial contractions. These findings suggest that hCG may directly maintain myometrial quiescence during pregna...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/endo.135.6.7988470

    authors: Ambrus G,Rao CV

    更新日期:1994-12-01 00:00:00

  • The Importance of Leptin to Reproduction.

    abstract::A healthy nutritional state is required for all aspects of reproduction and is signaled by the adipokine leptin. Leptin acts in a relatively narrow concentration range: too much or too little will compromise fertility. The leptin signal timing is important to prepubertal development in both sexes. In the brain, leptin...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/endocr/bqaa204

    authors: Childs GV,Odle AK,MacNicol MC,MacNicol AM

    更新日期:2021-02-01 00:00:00

  • Stress-induced secretion of adrenocorticotropin in rats is inhibited by administration of antisera to ovine corticotropin-releasing factor and vasopressin.

    abstract::Intact handled rats were pretreated with the immunoglobulin G fractions from normal rabbit serum or antisera to ovine corticotropin-releasing factor (CRF) and/or vasopressin and subjected to restraint or formalin stress. The formalin-induced rise in plasma ACTH was reduced to 28% in rats pretreated with anti-CRF, to 5...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/endo-116-3-966

    authors: Linton EA,Tilders FJ,Hodgkinson S,Berkenbosch F,Vermes I,Lowry PJ

    更新日期:1985-03-01 00:00:00

  • Lack of maternal glutamate cysteine ligase modifier subunit (Gclm) decreases oocyte glutathione concentrations and disrupts preimplantation development in mice.

    abstract::Glutathione (GSH) is the most abundant intracellular thiol and an important regulator of cellular redox status. Mice that lack the modifier subunit of glutamate cysteine ligase (Gclm), the rate-limiting enzyme in GSH synthesis, have decreased GSH synthesis. Nicotinamide nucleotide transhydrogenase, an inner mitochondr...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/en.2011-0207

    authors: Nakamura BN,Fielder TJ,Hoang YD,Lim J,McConnachie LA,Kavanagh TJ,Luderer U

    更新日期:2011-07-01 00:00:00

  • Identification of upstream stimulatory factor binding sites in the human IGFBP3 promoter and potential implication of adjacent single-nucleotide polymorphisms and responsiveness to insulin.

    abstract::The actions of IGFs are regulated at various levels. One mechanism involves binding to IGF-binding protein-3 (IGFBP-3) for transport, thus governing bioavailability. IGFBP3 transcription is modulated by many hormones and agents that stimulate or inhibit growth. We have previously shown in pediatric and adult cohorts a...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/en.2006-1729

    authors: Paquette J,Bessette B,Ledru E,Deal C

    更新日期:2007-12-01 00:00:00

  • Changes in messenger ribonucleic acid concentrations and plasma levels of growth hormone during the ovine estrous cycle and in response to exogenous estradiol.

    abstract::The role of GH during the ovine estrous cycle is unknown. In this study, pituitary GH mRNA and peripheral serum GH levels were measured in ewes representing the major phases of the estrous cycle. There was a significant rise (P less than 0.05) in both GH mRNA and serum GH concentrations during the follicular phase of ...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/endo-125-3-1474

    authors: Landefeld TD,Suttie JM

    更新日期:1989-09-01 00:00:00

  • Endoplasmic reticulum aminopeptidase-1 mediates leukemia inhibitory factor-induced cell surface human leukocyte antigen-G expression in JEG-3 choriocarcinoma cells.

    abstract::Maternal immune tolerance is required for extravillous trophoblasts (EVTs) to invade the decidua without rejection. Endoplasmic reticulum aminopeptidase-1 (ERAP1) generates human leukocyte antigen (HLA) class I-adapted antigenic peptides, but its function in trophoblasts lacking classical HLA class I molecules remains...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/en.2005-1449

    authors: Shido F,Ito T,Nomura S,Yamamoto E,Sumigama S,Ino K,Itakura A,Hattori A,Tsujimoto M,Mizutani S,Kikkawa F

    更新日期:2006-04-01 00:00:00

  • Endothelin-1 promotes steroidogenesis and stimulates protooncogene expression in transformed murine Leydig cells.

    abstract::The effects of endothelin-1 (ET-1), a potent vasoconstrictor and mitogen to various cell types, on proliferation and differentiated functions of the murine Leydig tumor cell line MA-10 were investigated. Kinetic binding experiments at room temperature showed that [125I] ET-1 bound to MA-10 cells and reached equilibriu...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/endo.132.2.8425480

    authors: Ergul A,Glassberg MK,Majercik MH,Puett D

    更新日期:1993-02-01 00:00:00

  • Deficiency of ALADIN impairs redox homeostasis in human adrenal cells and inhibits steroidogenesis.

    abstract:UNLABELLED:Triple A syndrome is a rare, autosomal recessive cause of adrenal failure. Additional features include alacrima, achalasia of the esophageal cardia, and progressive neurodegenerative disease. The AAAS gene product is the nuclear pore complex protein alacrima-achalasia-adrenal insufficiency neurological disor...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/en.2013-1241

    authors: Prasad R,Metherell LA,Clark AJ,Storr HL

    更新日期:2013-09-01 00:00:00

  • Testosterone metabolism in rabbits actively immunized with testosterone.

    abstract::Active immunization of male rabbits results in a marked increase in plasma testosterone (T) and in the fraction of T bound to circulating proteins. In order to identify the cause of the increased T levels, the half-life of T after castration, and the metabolic clearance rate (MCR) and production rate (PR) after a sing...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/endo-98-5-1142

    authors: Wickings EJ,Becher A,Nieschlag E

    更新日期:1976-05-01 00:00:00

  • Prostate-Specific Deletion of Cdh1 Induces Murine Prostatic Inflammation and Bladder Overactivity.

    abstract::Benign prostatic hyperplasia (BPH) is an age-related debilitating prostatic disease that is frequently associated with prostatic inflammation and bothersome lower urinary tract symptoms (LUTS). Animal models have shown that formalin- and bacterial-induced prostatic inflammation can induce bladder dysfunction; however,...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/endocr/bqaa212

    authors: Pascal LE,Mizoguchi S,Chen W,Rigatti LH,Igarashi T,Dhir R,Tyagi P,Wu Z,Yang Z,de Groat WC,DeFranco DB,Yoshimura N,Wang Z

    更新日期:2021-01-01 00:00:00

  • Morphological evidence for enhanced kisspeptin and neurokinin B signaling in the infundibular nucleus of the aging man.

    abstract::Peptidergic neurons synthesizing kisspeptin (KP) and neurokinin B (NKB) in the hypothalamic infundibular nucleus have been implicated in negative sex steroid feedback to GnRH neurons. In laboratory rodents, testosterone decreases KP and NKB expression in this region. In the present study, we addressed the hypothesis t...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/en.2012-1739

    authors: Molnár CS,Vida B,Sipos MT,Ciofi P,Borsay BÁ,Rácz K,Herczeg L,Bloom SR,Ghatei MA,Dhillo WS,Liposits Z,Hrabovszky E

    更新日期:2012-11-01 00:00:00

  • Digestion of thyroglobulin with purified thyroid lysosomes: preferential release of iodoamino acids.

    abstract::[131I]Thyroglobulin [( 131I]Tg), prepared by either enzymatic iodination of human goiter Tg in vitro or isolation from the thyroids of rats previously injected with 131I, was digested with a solubilized enzyme mixture prepared from purified hog thyroid lysosomes. The digestion was performed at 37 C for 24 h under nitr...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/endo-121-2-714

    authors: Tokuyama T,Yoshinari M,Rawitch AB,Taurog A

    更新日期:1987-08-01 00:00:00

  • Evidence that corticotropin-releasing hormone modulates myometrial contractility during human pregnancy.

    abstract::As human pregnancy advances, CRH increases exponentially and is hypothesized to trigger the transition from myometrial quiescence to active contractions at labor. Paradoxically, CRH stimulates cAMP production, suggesting it should cause relaxation. To evaluate CRH as a mediator of quiescence, the effect of CRH on cont...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/en.2009-0348

    authors: Tyson EK,Smith R,Read M

    更新日期:2009-12-01 00:00:00

  • Estradiol-17beta stimulates specific receptor and endogenous nitric oxide-dependent dynamic endothelial protein S-nitrosylation: analysis of endothelial nitrosyl-proteome.

    abstract::Covalent adduction of a nitrosyl group to cysteines [S-nitrosylation (S-NO)] is emerging as a key route for nitric oxide (NO) to directly modulate protein functions. Here, we studied the effects of estrogens on endothelial protein S-NO and analyzed the nitrosyl-proteomes by biotin/CyDye switch technique combined with ...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/en.2009-1356

    authors: Zhang HH,Feng L,Livnat I,Hoh JK,Shim JY,Liao WX,Chen DB

    更新日期:2010-08-01 00:00:00

  • Insulin receptor substrate-1 is present in hepatocyte nuclei from intact rats.

    abstract::Insulin receptor substrate-1 (IRS-1), the primary substrate for the insulin receptor tyrosine kinase in most cells and tissues, is a key component of the insulin signaling network. Numerous studies have documented the trafficking of IRS-1 from the cell membrane to intracellular, extranuclear compartments. During the c...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/en.2002-220321

    authors: Boylan JM,Gruppuso PA

    更新日期:2002-11-01 00:00:00

  • Desensitization of beta-adrenergic receptors by pheochromocytoma.

    abstract::Prolonged stimulation of cells by beta-adrenergic receptor agonists may lead to diminished responsiveness of the cells to subsequent activation by catecholamines. This phenomenon has been termed desensitization; the mechanism(s) for desensitization may involve an apparent loss in the number of beta-adrenergic receptor...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/endo-114-4-1272

    authors: Tsujimoto G,Manger WM,Hoffman BB

    更新日期:1984-04-01 00:00:00

  • Glucocorticoids differentially modulate insulin-mediated protein and glycogen synthetic signaling downstream of protein kinase B in rat myocardium.

    abstract::Insulin and protein kinase B (or Akt) play critical roles in cardiomyocytic growth and survival. High concentrations of glucocorticoids antagonize insulin's action. To examine whether endogenous glucocorticoids modulate insulin's effect on Akt signaling in the protein and glycogen synthetic pathways in myocardium, we ...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/en.2003-1429

    authors: Wu Y,Barrett EJ,Long W,Liu Z

    更新日期:2004-03-01 00:00:00

  • The rat ovarian phospholipase A2 system: gene expression, cellular localization, activity characterization, and interleukin-1 dependence.

    abstract::We have previously demonstrated that interleukin-1 beta (IL-1 beta), a putative intermediary in the ovulatory process, is a potent stimulator of ovarian PG biosynthesis. In this communication, we examine the possibility that this IL-1 effect reflects in part the induction of arachidonic acid mobilization by phospholip...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/endo.138.1.4826

    authors: Kol S,Ruutiainen-Altman K,Ben-Shlomo I,Payne DW,Ando M,Adashi EY

    更新日期:1997-01-01 00:00:00

  • A mouse model demonstrates a multigenic origin of congenital hypothyroidism.

    abstract::Congenital hypothyroidism with thyroid dysgenesis (TD) is a frequent human condition characterized by elevated levels of TSH in response to reduced thyroid hormone levels. Congenital hypothyroidism is a genetically heterogeneous disease. In the majority of cases studied, no causative mutations have been identified and...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/en.2005-0882

    authors: Amendola E,De Luca P,Macchia PE,Terracciano D,Rosica A,Chiappetta G,Kimura S,Mansouri A,Affuso A,Arra C,Macchia V,Di Lauro R,De Felice M

    更新日期:2005-12-01 00:00:00

  • Detection of hormone release from individual cells in mixed populations using a reverse hemolytic plaque assay.

    abstract::Prolactin (Prl) secreting cells in a mixed pituitary cell culture form microscopically-identifiable plaques (zones of hemolysis around the lactotropes) when incubated in a monolayer with staphylococcal protein-A-coated ovine erythrocytes in the presence of Prl antiserum and complement. Plaques form first at 15-30 min ...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/endo-112-3-1135

    authors: Neill JD,Frawley LS

    更新日期:1983-03-01 00:00:00

  • Transforming growth factor-beta3 increases gap-junctional communication among folliculostellate cells to release basic fibroblast growth factor.

    abstract::Folliculostellate (FS) cells are known to communicate with each other and with endocrine cells via gap junctions in the anterior pituitary. We investigated whether TGFbeta3 and estradiol, known to regulate FS cell production and secretion of basic fibroblast growth factor (bFGF), increases gap junctional communication...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/en.2005-0122

    authors: Kabir N,Chaturvedi K,Liu LS,Sarkar DK

    更新日期:2005-09-01 00:00:00

  • Isolation of progesterone-dependent complementary deoxyribonucleic acid fragments from rhesus monkey endometrium by sequential subtractive hybridization and polymerase chain reaction amplification.

    abstract::The steroid sex hormone progesterone (P) induces the expression of a variety of genes through a signal transduction pathway mediated by the P receptor, a DNA-binding regulator of transcription. To identify genes and gene networks that are P dependent in the rhesus endometrium, we used a powerful technique employing su...

    journal_title:Endocrinology

    pub_type: 杂志文章

    doi:10.1210/endo.134.3.8119170

    authors: Ace CI,Balsamo M,Le LT,Okulicz WC

    更新日期:1994-03-01 00:00:00