Abstract:
:Smad4, a key transcription factor in the transforming growth factor-β signaling pathway, is involved in a variety of cell physiologic and pathologic processes. Here, we characterized megakaryocyte/platelet-specific Smad4 deficiency in mice to elucidate its effect on platelet function. We found that megakaryocyte/platelet-specific loss of Smad4 caused mild thrombocytopenia and significantly extended first occlusion time and tail bleeding time in mice. Smad4-deficient platelets showed reduced agonist-induced platelet aggregation. Further studies showed that a severe defect was seen in integrin αIIbβ3-mediated bidirectional (inside-out and outside-in) signaling in Smad4-deficient platelets, as evidenced by reduced fibrinogen binding and α-granule secretion, suppressed platelet spreading and clot retraction. Microarray analysis showed that the expression levels of multiple genes were altered in Smad4-deficient platelets. Among these genes, spleen tyrosine kinase (Syk) and Rho-associated coiled-coil containing protein kinase 2 (ROCK2) were downregulated several times as confirmed by quantitative reverse-transcription polymerase chain reaction and immunoblotting. Further research showed that Smad4 directly regulates ROCK2 transcription but indirectly regulates Syk. Megakaryocyte/platelet-specific Smad4 deficiency caused decreased expression levels of Syk and ROCK2 in platelets. These results suggest potential links among Smad4 deficiency, attenuated Syk, and ROCK2 expression and defective platelet activation.
journal_name
Mol Pharmacoljournal_title
Molecular pharmacologyauthors
Wang Y,Jiang L,Mo X,Lan Y,Yang X,Liu X,Zhang J,Zhu L,Liu J,Wu Xdoi
10.1124/mol.116.107417subject
Has Abstractpub_date
2017-09-01 00:00:00pages
285-296issue
3eissn
0026-895Xissn
1521-0111pii
mol.116.107417journal_volume
92pub_type
杂志文章abstract::Microglial activation is an invariant feature of Alzheimer's disease (AD). It is noteworthy that cannabinoids are neuroprotective by preventing β-amyloid (Aβ)-induced microglial activation both in vitro and in vivo. On the other hand, the phytocannabinoid cannabidiol (CBD) has shown anti-inflammatory properties in dif...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.111.071290
更新日期:2011-06-01 00:00:00
abstract::Lead (Pb(2+)) is a well-known inhibitor of voltage-dependent Ca(2+) channels in their native environments in several types of cells. However, its effects on discrete Ca(2+) channel phenotypes in isolation have not been well studied. We compared how specific subtypes of human neuronal high-voltage-activated Ca(2+) chan...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.62.6.1418
更新日期:2002-12-01 00:00:00
abstract::Binding by 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) to the Ah receptor leads to transcriptional activation of several genes and a toxicity syndrome that includes tumor promotion, wasting, hormonal and immune system dysfunction, and death. Recent findings indicate that TCDD may also affect cardiac function. Here, we ...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1993-12-01 00:00:00
abstract::Unlike the majority of G protein-coupled receptors, the prostaglandin E(2) (PGE(2)) E-prostanoid 3 (EP3) receptor binds agonist with high affinity that is insensitive to the presence of guanosine 5[prime]-O-(3-thio)triphosphate (GTPγS). We report the identification of mutations that confer GTPγS sensitivity to agonist...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.112.080473
更新日期:2013-01-01 00:00:00
abstract::The mechanism underlying the crosstalk between multiple G protein-coupled receptors remains poorly understood. We previously reported that prostaglandin E receptor EP1 facilitates dopamine D1 receptor signaling in striatal slices and promotes behavioral responses induced by D1 receptor agonists. Here, using human embr...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.113.087288
更新日期:2013-09-01 00:00:00
abstract::Depolarization-induced 86Rb efflux, an index of K+ efflux, was developed by using mammalian cultured spinal cord neurons to study the effect of gamma aminobutyric acid (GABAB) receptor activation on Ca2(+)-activated K(+)-channels. The Ca2(+)-activated 86Rb efflux was obtained by using two methods. The first method uti...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1990-09-01 00:00:00
abstract::The regulation of cellular responsiveness to dopamine via the D2 dopamine receptor was investigated in mouse fibroblast Ltk-cells stably expressing the rat D2-short receptor [Nature (Lond.) 336:783-787 (1988)]. Dopamine inhibited forskolin-stimulated cAMP levels in these cells (half-maximal inhibition at 3.9 +/- 1.1 n...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1991-01-01 00:00:00
abstract::Multiple lines of evidence indicate that the platinum-containing cancer drugs enter cells, are distributed to various subcellular compartments, and are exported from cells via transporters that evolved to manage copper homeostasis. The cytotoxicity of the platinum drugs is directly related to how much drug enters the ...
journal_title:Molecular pharmacology
pub_type: 杂志文章,评审
doi:10.1124/mol.109.063172
更新日期:2010-06-01 00:00:00
abstract::Expression of the angiotensin II type 1 receptor (AT1-R) mRNA in vascular smooth muscle cells (VSMC) is down-regulated by a variety of agonists, including growth factors, agonists of Galphaq protein-coupled receptors, and activators of adenylyl cyclase. To determine whether cAMP-dependent protein kinases (PKA) partici...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.54.3.514
更新日期:1998-09-01 00:00:00
abstract::Two peptides, which have no significant homology with known protein structures, were obtained by microsequencing of a mu-opioid binding protein purified to homogeneity from bovine striatal membranes. Polyclonal antibodies generated against portions of these peptides immunoprecipitated up to 65% of radiolabeled purifie...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1993-10-01 00:00:00
abstract::Microglia, as phagocytes and antigen-presenting cells in the central nervous system, are activated in such disease processes as stroke and multiple sclerosis. Because peripheral macrophages are capable of producing endocannabinoids, we have examined endocannabinoid production in a macrophage-colony stimulating factor ...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.65.4.999
更新日期:2004-04-01 00:00:00
abstract::Bufuralol 1'-hydroxylation is a prototypical reaction catalyzed by cytochrome P450 (P450) 2D6, an enzyme known to show debrisoquine/sparteine-type genetic polymorphism in humans. In the present study we further examined the roles of several human P450 enzymes, as well as P450 2D6, in the hydroxylation of (+/-)-bufural...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1994-09-01 00:00:00
abstract::Phosphodiesterase-9 (PDE9) inhibitors have been studied as potential therapeutics for treatment of central nervous system diseases and diabetes. Here, we report the discovery of a new category of PDE9 inhibitors by rational design on the basis of the crystal structures. The best compound, (S)-6-((1-(4-chlorophenyl)eth...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.115.099747
更新日期:2015-11-01 00:00:00
abstract::SR33557 belongs to a new class of molecules (indolizinsulfones) that act on the same receptor complex that has been characterized for other classical calcium channel effectors. The main binding properties of SR33557 to rabbit skeletal muscle are as follows. (i) Unlabeled SR33557 completely inhibits the specific bindin...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1989-06-01 00:00:00
abstract::Using [3H]leukotriene C4 (LTC4) and radioligand-binding techniques, specific leukotriene C4 binding sites have been identified in membranes derived from guinea pig ventricular myocardium. High performance liquid chromatography analyses indicated that, in the presence of the gamma-glutamyl transpeptidase inhibitor L-se...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1985-02-01 00:00:00
abstract::Diltiazem is a widely prescribed Ca2+ antagonist drug for cardiac arrhythmia, hypertension, and angina pectoris. Using the ancestral CaV channel construct CaVAb as a molecular model for X-ray crystallographic analysis, we show here that diltiazem targets the central cavity of the voltage-gated Ca2+ channel underneath ...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.119.117531
更新日期:2019-10-01 00:00:00
abstract::Microinjection, but not extracellular application, of cytidine-5'-diphosphate-D-glucose (CDPG) has been shown to elicit Ca(2+)-dependent currents in Xenopus laevis oocytes. These responses were comparable to those of inositol-1,4,5-trisphosphate (InsP3) in being both rapid and dose dependent. For example, maximal ampl...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1996-02-01 00:00:00
abstract::In order to elucidate the key atoms and/or stereostructures necessary for the inhibitory emergence of aldose reductase, crystal structure determinations were carried out for 11 oxazolecarbamate analogues, which have similar chemical and physicochemical properties but different inhibitory activities. The molecular conf...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1988-09-01 00:00:00
abstract::Two forms of the multisubunit gamma-aminobutyric acid (GABA)A receptor were expressed in Xenopus oocytes by injecting mRNA encoding the bovine GABAA receptor subunit cDNAs for alpha 1 beta 1 gamma 2L and alpha 3 beta 1 gamma 2L. The properties of these two combinations were examined by electrophysiological recording o...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1993-02-01 00:00:00
abstract::To study the functional role of individual alpha1-adrenergic (AR) subtypes in blood pressure (BP) regulation, we used mice lacking the alpha1B-AR and/or alpha1D-AR with the same genetic background and further studied their hemodynamic and vasoconstrictive responses. Both the alpha1D-AR knockout and alpha1B-/alpha1D-AR...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.104.007500
更新日期:2005-03-01 00:00:00
abstract::Glutathione-liganded binuclear dinitrosyl iron complex (glut-BDNIC) has been proposed to be a donor of nitric oxide (NO). This study was undertaken to investigate the mechanisms of vasoactivity, systemic hemodynamic effects, and pharmacokinetics of glut-BDNIC. To test the hypothesis that glut-BDNICs vasodilate by rele...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.117.110957
更新日期:2018-05-01 00:00:00
abstract::Batrachotoxin (BTX), from South American frogs of the genus Phyllobates, irreversibly activates voltage-gated sodium channels. Previous work demonstrated that a phenylalanine residue approximately halfway through pore-lining transmembrane segment IVS6 is a critical determinant of channel sensitivity to BTX. In this st...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.61.4.905
更新日期:2002-04-01 00:00:00
abstract::The aim of this study was to clarify the mechanism by which cytochrome P450 (P450)-mediated catalytic activity is decreased following interferon (IFN) administration. Microsomal steroid hydroxylation was assessed to test the hypothesis that IFN selectively decreases the activities of individual P450 isozymes in male r...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1990-09-01 00:00:00
abstract::We reported previously that protein associated with Myc (PAM) interacts with the C2 domain of type V adenylyl cyclase (ACV-C2) and that purified PAM is a potent inhibitor of Galphas-stimulated ACV activity (J Biol Chem 276:47583-47589, 2001). The present study was conducted to identify the region in PAM that inhibits ...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.104.005355
更新日期:2005-01-01 00:00:00
abstract::Melanoma differentiation associated gene-7 (mda-7)/interleukin-24 (IL-24), a member of the IL-10 cytokine gene family, preferentially induces cell death in neoplastic epithelial cells types while sparing their normal counterparts. The effects of mda-7/IL-24 in acute myeloid leukemia (AML) cells have not been extensive...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.110.068007
更新日期:2010-12-01 00:00:00
abstract::A conjugate molecule was synthesized by linking the DNA-intercalative antitumor drug 4'-(9-acridinylamino)methanesulfon-manisidide (mAMSA) via a 4-carboxamide side chain to a dipyrrolecarboxamide moiety structurally related to the minor groove-binding antibiotic netropsin. The molecule (netropsin/ mAMSA) behaves as a ...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1997-03-01 00:00:00
abstract::K201 (JTV-519) may prevent abnormal Ca(2+) leak from the sarcoplasmic reticulum (SR) in the ischemic heart and skeletal muscle (SkM) by stabilizing the ryanodine receptors (RyRs; RyR1 and RyR2, respectively). We tested direct modulation of the SR Ca(2+)-stimulated ATPase (SERCA) and RyRs by K201. In isolated cardiac a...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.115.102277
更新日期:2016-08-01 00:00:00
abstract::We determined the effect of flufenamic acid (FFA) and related derivatives on gap junction channel currents, applying the dual whole-cell patch-clamp technique to pairs of N2A neuroblastoma cells transfected with various connexins. FFA reduced gap junction channel currents in a reversible and concentration-dependent ma...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.63.6.1389
更新日期:2003-06-01 00:00:00
abstract::Pharmacological studies suggest a role for CB1 cannabinoid receptors (CB1R) in regulating neurogenesis in the adult brain. To investigate this possibility, we measured neurogenesis by intraperitoneal injection of bromodeoxyuridine (BrdU), which labels newborn neurons, in wild-type and CB1R-knockout (CB1R-KO) mice. CB1...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.66.2.204
更新日期:2004-08-01 00:00:00
abstract::3H-Neurokinin A (3H-NKA) with high specific activity (75 Ci/mmol) was synthesized to study NKA (NK-2)-binding sites on membrane preparations of various tissues in the rat, including brain, spinal cord, duodenum, vas deferens, and ileum. The binding capacity of 3H-NKA (0.9 nM) was very low in membrane preparations of d...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1987-12-01 00:00:00