Modulation of GPCR Conformationsby Ligands, G-Proteins, and Arrestins

2007 ◽  
pp. 211-228 ◽  
Author(s):  
E. R. Prossnitz ◽  
L. A. Sklar
Keyword(s):  
G Proteins

Presence of P2X1 Purinoceptors in Human Platelets and Megakaryoblastic Cell Lines

1997 ◽  
Vol 78 (06) ◽  
pp. 1500-1504 ◽  
Author(s):  
Catherine Vial ◽  
Béatrice Hechier ◽  
Catherine Léon ◽  
Jean-Pierre Cazenave ◽  
Christian Gachet
Keyword(s):  
Intracellular Calcium ◽  
G Proteins ◽  
Cell Lines ◽  
Calcium Influx ◽  
Human Platelets ◽  
P2y1 Receptor ◽  
Calcium Response ◽  
Ionotropic Receptors ◽  
External Calcium

SummaryHuman platelets are thought to possess at least two subtypes of purinoceptor, one of which, coupled to G-proteins, could be the P2Y1 receptor (Léon et al. 1997). However, it has been suggested that the unique rapid calcium influx induced by ADP in platelets could involve P2X1 ionotropic receptors (MacKenzie et al. 1996) and the aim of this study was thus to investigate the presence of P2X purinoceptors in platelets and megakaryoblastic cells. Using PCR experiments, we found P2X1 mRNA to be present in human platelets and megakaryoblastic cell lines. In platelets, the selective P2X1 agonist αβMeATP induced a rise in intracellular calcium only in the presence of external calcium and this effect was antagonized by suramin and PPADS. Repeated addition of a�MeATP desensitized the P2X1 purinoceptor but only slightly affected the ADP response, while no calcium response to αβMeATP was observed in megakaryoblastic cells. These results support the existence of functional P2X1 purinoceptors on human platelets and the presence of P2X1 transcripts in megakaryoblastic cell lines.

Analysis of inhibitory G-proteins Gi-alpha 2 and Gi-alpha 3 in patients supported by ventricular assist devices

2005 ◽  
Vol 53 (S 01) ◽  
Author(s):  
H Milting ◽  
A Kassner ◽  
R Brendel ◽  
L Arusoglu ◽  
R Körfer ◽  
...  
Keyword(s):  
G Proteins ◽  
Ventricular Assist Devices ◽  
Ventricular Assist ◽  
Assist Devices

G proteins and modulation of insulin secretion

Diabetes ◽  
1991 ◽  
Vol 40 (1) ◽  
pp. 1-6 ◽  
Author(s):  
R. P. Robertson ◽  
E. R. Seaquist ◽  
T. F. Walseth
Keyword(s):  
Insulin Secretion ◽  
G Proteins

FUNCTIONAL INTERACTIONS OF PERTUSSIS TOXIN-SENSITIVE G-PROTEINS WITH THE TRANSFECTED μ-OPIOID RECEPTOR IN RAT 1 FIBROBLASTS

Analgesia ◽  
1995 ◽  
Vol 1 (4) ◽  
pp. 438-441
Author(s):  
Zafiroula Georgoussi ◽  
Ian Mullaney ◽  
Alan Wise ◽  
Craig Carr ◽  
Graeme Milligan
Keyword(s):  
G Proteins ◽  
Opioid Receptor ◽  
Pertussis Toxin ◽  
Functional Interactions ◽  
Μ Opioid Receptor
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