Abstract:
:The D405N and Y546F mutations of the human lutropin receptor (hLHR) have previously been shown to partially attenuate hCG-stimulated cAMP synthesis despite normal cell surface expression and hCG binding affinity (Min, L. and Ascoli, M. Mol. Endocrinol. 14:1797-1810, 2000). We now show that these mutations each stabilize a resting state of the hLHR. A combined mutant D405N,Y546F is similarly expressed at the cell surface and exhibits normal ligand-binding, but is profoundly signaling impaired. Introduction of hLHR(wt) into cells stably expressing the signaling inactive D405N,Y546F resulted in the attenuation of hCG-stimulated cAMP production by hLHR(wt) even if excess Gs is co-expressed. Similarly, co-expression of D405N,Y546F with hLHR constitutively active mutants (CAMs) attenuated their constitutive activity. Quantitative bioluminescence resonance energy transfer (BRET) analyses demonstrated that D405N,Y546F formed heterodimers with both wt and CAM hLHR. In contrast hLHR(D405N,Y546F) did not heterodimerize with the melanocortin 3 receptor (MC3R) and agonist-stimulated cAMP production through the MC3R was not attenuated when these two receptors were co-expressed. Taken altogether, our data demonstrate that a signaling inactive hLHR mutant (that is trafficked normally to the plasma membrane) attenuates the signaling of the cell surface localized wt or the constitutively active hLHR due to receptor heterodimerization. Our studies, therefore, suggest a novel ramification of GPCR signaling resulting from receptor dimerization.
journal_name
Cell Signaljournal_title
Cellular signallingauthors
Zhang M,Feng X,Guan R,Hébert TE,Segaloff DLdoi
10.1016/j.cellsig.2009.07.003subject
Has Abstractpub_date
2009-11-01 00:00:00pages
1663-71issue
11eissn
0898-6568issn
1873-3913pii
S0898-6568(09)00210-1journal_volume
21pub_type
杂志文章abstract::Circular RNAs (circRNAs) belong to a diverse class of stable RNAs expressed in all cell types. Their proposed functions include sponging of microRNAs (miRNAs), sequestration and trafficking of proteins, assembly of multimeric complexes, production of peptides, and regulation of transcription. Backsplicing due to RNA s...
journal_title:Cellular signalling
pub_type: 杂志文章,评审
doi:10.1016/j.cellsig.2020.109696
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abstract::Proteoglycans (PGs) represent a large proportion of the components that constitute the extracellular matrix (ECM). They are a diverse group of glycoproteins characterized by a covalent link to a specific glycosaminoglycan type. As part of the ECM, heparan sulfate (HS)PGs participate in both physiological and pathologi...
journal_title:Cellular signalling
pub_type: 杂志文章,评审
doi:10.1016/j.cellsig.2020.109822
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abstract::Dynamin, a 100 kD GTPase, is necessary for the normal development and function of mammalian neural tissue. In neurons, it is necessary for the biogenesis of synaptic vesicles, and in other cell types dynamin has a general and important role in clathrin mediated receptor endocytosis. Different isoforms function as mole...
journal_title:Cellular signalling
pub_type: 杂志文章,评审
doi:10.1016/s0898-6568(97)00041-7
更新日期:1997-09-01 00:00:00
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journal_title:Cellular signalling
pub_type: 杂志文章,评审
doi:10.1016/j.cellsig.2020.109816
更新日期:2021-01-01 00:00:00
abstract::The human NPY Y(1) receptor undergoes fast agonist-induced internalization via clathrin-coated pits then recycles back to the cell membrane. In an attempt to identify the molecular determinants involved in this process, we studied several C-terminal truncation mutants tagged with EFGP. In the absence of agonist, Y(1) ...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2010.09.007
更新日期:2011-01-01 00:00:00
abstract::Epidermal growth factor (EGF) and transforming growth factor type beta1 (TGF-beta1) exert opposite effects in most cells. A potential regulation between the two factors has been studied at a transcriptional level, but never at a protein level. MDA-MB-231 is a breast carcinoma cell line which possesses large quantities...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/s0898-6568(99)00048-0
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abstract::Strong evidence suggests that neutrophils may play an active role in acute and chronic inflammatory disorders, such as rheumatoid arthritis and atherosclerosis. Given the role of pro-inflammatory cytokine TNF-alpha in these inflammatory processes, we planned the present study to investigate the effect of short term in...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2007.11.008
更新日期:2008-03-01 00:00:00
abstract::Prostatic stromal proliferation may be commonly associated with the development of benign prostatic hyperplasia. In this study, we investigate the role of testosterone and protein kinase C in stimulating cultured stromal cell proliferation. Testosterone increased the uptake of [(3)H]-thymidine into the human cultured ...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/s0898-6568(01)00205-4
更新日期:2001-10-01 00:00:00
abstract::Actinomycin D and nutlin-3a (A + N) activate p53, partly through induction of phosphorylation on Ser392. The death of A549 cells induced by A + N morphologically resembles inflammation-inducing pyroptosis - cell destruction triggered by activated caspase-1. The treatment with A + N (or camptothecin) strongly upregulat...
journal_title:Cellular signalling
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doi:10.1016/j.cellsig.2020.109552
更新日期:2020-05-01 00:00:00
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journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2020.109665
更新日期:2020-08-01 00:00:00
abstract::We have isolated a cDNA from a human liver library which is 2349 base pairs in length and encodes a near-full length seven transmembrane receptor (432 amino acids), 85% homologous to the amino acid sequence for the rat vasoactive intestinal peptide (VIP) receptor. Northern blot analysis identifies a major species at 3...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/0898-6568(94)90037-x
更新日期:1994-03-01 00:00:00
abstract::Dysfunctional regulation of signaling pathways downstream of the insulin receptor plays a pivotal role in the pathogenesis of insulin resistance and type 2 diabetes. In this study we report both in vitro and in vivo experimental evidence for a role of Cullin-RING E3 ubiquitin ligase 7 (CRL7) in the regulation of insul...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2013.11.005
更新日期:2014-02-01 00:00:00
abstract::Clinical studies have elucidated the negative correlation between microtubules-associated protein 1 light chain 3-B (LC3B) protein expression and overall survival of breast cancer patients. Our previous data demonstrated corticortropin-releasing hormone family (CRHs) suppressed migration of breast cancer cells via CRH...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2019.03.001
更新日期:2019-06-01 00:00:00
abstract::Na(+)/H(+) exchanger-1 (NHE-1) activity is known to play a critical role in the neuronal injury caused by glutamate. However, the underlying mechanism is not clear. This study shows that NHE-1 activation and its phosphorylation during glutamate exposure were attenuated by the inhibition of protein kinase C (PKC)-βI an...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2013.12.011
更新日期:2014-04-01 00:00:00
abstract::Tamoxifen resistance represents a daunting challenge to the successful treatment for breast cancer. Krüppel-like factor 4 has critical roles in the development and progression of breast cancer, but its expression, function and regulation in the efficacy of TAM therapy in breast cancer have yet to be investigated. Here...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2017.09.025
更新日期:2018-01-01 00:00:00
abstract::CD44 is a hyaluronan binding cell surface signal transducing receptor that influences motility, cell survival and proliferation as well as the formation of tumor microenvironment. CD44 contains two variable regions encoded by variable exons. Alternative splicing, which is often deregulated in cancer, can produce vario...
journal_title:Cellular signalling
pub_type: 杂志文章,评审
doi:10.1016/j.cellsig.2014.07.011
更新日期:2014-10-01 00:00:00
abstract::Toll-like-receptor mediated signaling is finely regulated by a complex intracellular protein network including the interleukin-1 receptor associate kinases (IRAKs). IRAK-4, 1, and 2 may positively regulate innate immunity signaling through the activation of various downstream kinases such as MAPKs. In contrast, IRAK-M...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2007.02.009
更新日期:2007-07-01 00:00:00
abstract::Phosphatidic acid, the product of phospholipase D catalysed phosphatidylcholine hydrolysis is an important signalling molecule that has been implicated in regulation of actin cytoskeleton remodelling and secretion from mast cells. We show that human PLD1b (hPLD1b) is an actin-binding protein and the N-terminus is pred...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2006.07.016
更新日期:2007-02-01 00:00:00
abstract::CD40 is critically involved in Fas-mediated cholangiocyte apoptosis during liver inflammation, but the underlying signalling events are poorly understood. Our recent work implicated AP-1 in CD40-induced cholangiocyte apoptosis, but suggested involvement of other signalling pathways. Because STAT3 has been implicated i...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2005.05.015
更新日期:2006-04-01 00:00:00
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journal_title:Cellular signalling
pub_type: 杂志文章
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更新日期:2020-03-01 00:00:00
abstract::We have shown previously that the angiotensin II (Ang II) receptor AT2 reduces the intracellular levels of cGMP in Xenopus oocytes when activated by ligand binding, and the C-terminal cytoplasmic tail of the AT2 acts as a negative regulator of this function. Here we report the effects of mutations in the 2nd and 3rd i...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2004.08.007
更新日期:2005-03-01 00:00:00
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journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2010.05.003
更新日期:2010-09-01 00:00:00
abstract::We analyse the role of the G proteins in regulating collagen gene expression by measuring collagen alpha 1(I) mRNA levels in cultured hepatic stellate cells in basal conditions and after stimulating or inhibiting the major intracellular signalling pathways. Stimulation of Gs protein and adenylyl cyclase or the additio...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/s0898-6568(97)00036-3
更新日期:1998-03-01 00:00:00
abstract::Type I cGMP-dependent protein kinases (PKGs) translocate to the nucleus to regulate gene expression in some, but not all cell types; we hypothesized that nuclear translocation of PKG may be regulated by extra-nuclear anchoring proteins. The inositol 1,4,5-triphosphate (IP(3)) receptor-associated cGMP kinase substrate ...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2008.03.009
更新日期:2008-07-01 00:00:00
abstract::Leptin, the adipocyte-secreted hormone that centrally regulates weight control, is known to function as an immunomodulatory regulator. We investigated the signaling pathway involved in IL-8 production caused by leptin in both rheumatoid arthritis synovial fibroblasts (RASF) and osteoarthritis synovial fibroblasts (OAS...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2008.04.003
更新日期:2008-08-01 00:00:00
abstract::We have previously shown that N18TG2 neuroblastoma cells express the type 6 adenylyl cyclase and that preincubation with nitric oxide (NO) attenuates Gs- and forskolin-stimulated activity. Here we show that this inhibition reflects a direct action of NO on the adenylyl cyclase. Preincubation of N18TG2 cell membranes a...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/s0898-6568(99)00082-0
更新日期:2000-04-01 00:00:00
abstract::G protein-coupled receptor kinases (GRKs) are key modulators of G protein-coupled receptor signalling. Increasing evidence points to the occurrence of complex mechanisms able to modulate the subcellular localization, activity and expression levels of GRKs, revealing new functional interactions of these kinases with di...
journal_title:Cellular signalling
pub_type: 杂志文章,评审
doi:10.1016/s0898-6568(03)00099-8
更新日期:2003-11-01 00:00:00
abstract::CD45 is a leukocyte specific transmembrane glycoprotein and a receptor-like protein tyrosine phosphatase (PTP). CD45 can be expressed as several alternatively spliced isoforms that differ in the extracellular domain. The isoforms are regulated in a cell type and activation state-dependent manner, yet their function ha...
journal_title:Cellular signalling
pub_type: 杂志文章,评审
doi:10.1016/j.cellsig.2009.10.003
更新日期:2010-03-01 00:00:00
abstract::The dual-specificity mitogen-activated protein kinase (MAPK) phosphatase-1 (MKP-1) inactivates MAP kinases by dephosphorylation. Here we show that the proinflammatory cytokine interleukin (IL)-17A induces adult mouse primary cardiac fibroblast (CF) proliferation and migration via IL-17 receptor A//IL-17 receptor C-dep...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2011.10.010
更新日期:2012-02-01 00:00:00
abstract::The role of microtubules (MTs) in steroid hormone-dependent human glucocorticoid receptor (hGR) activation/translocation is controversial. It was demonstrated recently that colchicine (COL) down-regulates hGR-driven genes in primary human hepatocytes by a mechanism involving inhibition of hGR translocation to the nucl...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2004.06.010
更新日期:2005-02-01 00:00:00