In this study, we describe the presence of P2 receptor subtypes and Ca2+ signaling in erythroblasts. ATP and ADP produced a biphasic increase of intracellular Ca2+ concentration ([Ca2+]i), with an initial transient phase followed by a sustained phase. Reverse transcription polymerase chain reaction (RT-PCR) showed the expression of P2Y1, P2Y2 and P2Y12. The selective P2Y1 receptor antagonist 2'-deoxy-N6-methyl-adenosine-3',5'-diphosphate (MRS2179) and the G(i) protein inhibitor pertussis toxin blocked Ca2+ increase. The initial transient [Ca2+]i increase phase was sensitive to the 1,4,5-inositol trisphosphate (IP3) receptor blocker 2-aminoethoxy-diphenylborate (2-APB), while the sustained phase was sensitive to the protein kinase C (PKC) inhibitor 2-[1-(3-dimethylaminopropyl)-1H-indol-3-yl]-3-(1H-indol-3-yl)-maleimide (GF109203X) and calcium calmodulin kinase II (CaMKII) inhibitor 1-[N,O-bis(5-isoquinolinesulfonyl)-N-methyl-L-tyrosyl]-4-phenylpiperazine (KN-62). In addition, the PKC activator phorbol-12,13-dibutyrate (PDBu) produced increase of [Ca2+]i. Flow cytometry analysis showed the expression of Ca2+-dependent PKC alpha, betaI, gamma and phospho-CaMKII. These results suggest that the activation of the P2Y1 receptor triggers two different [Ca2+]i increase pathways, one IP3-dependent and the other kinase-dependent.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.ejphar.2006.01.010 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Sex-specific activation of platelet purinergic signaling is key in local cytokine release and phagocytosis in the peritoneal cavity in intra-abdominal sepsis.
Am J Physiol Cell Physiol
January 2025
Department of Pharmaceutical Sciences, School of Pharmacy, College of Health and Human Sciences, North Dakota State University, Fargo, ND, USA.
Intra-abdominal sepsis is a life-threatening complex syndrome caused by microbes in the gut microbiota invading the peritoneal cavity. It is one of the major complications of intra-abdominal surgery. To date, only supportive therapies are available.
View Article and Find Full Text PDFPyrimidinergic P2Y1-Like Nucleotide Receptors Are Functional in Rat Conjunctival Goblet Cells.
Invest Ophthalmol Vis Sci
January 2025
Schepens Eye Research Institute, Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, United States.
Purpose: To investigate the presence of uridine-5'-triphosphate (UTP)-activated P2Y1-like nucleotide receptors (P2Y2R, P2Y4R, and P2Y6R) in conjunctival goblet cells (CGCs) and determine if they increase intracellular Ca2+ concentration ([Ca2+]i) and induce mucin secretion.
Methods: Adult, male rat conjunctiva was used for culture of CGCs. To investigate the expression of P2YRs, mRNA was extracted from CGCs and used for reverse transcription PCR (RT-PCR) with commercially obtained primers specific to P2Y2R, P2Y4R, and P2Y6R.
Adenosine diphosphate stimulates VEGF-independent choroidal endothelial cell proliferation: A potential escape from anti-VEGF therapy.
Proc Natl Acad Sci U S A
January 2025
Department of Pathology, University of California San Diego, La Jolla, CA 92093.
We hypothesized that a strategy employing tissue-specific endothelial cells (EC) might facilitate the identification of tissue- or organ-specific vascular functions of ubiquitous metabolites. An unbiased approach was employed to identify water-soluble small molecules with mitogenic activity on choroidal EC. We identified adenosine diphosphate (ADP) as a candidate, following biochemical purification from mouse EL4 lymphoma extracts.
View Article and Find Full Text PDFP2YR-IGFBP2 signaling: new contributor to astrocyte-neuron communication.
Purinergic Signal
January 2025
International Joint Research Centre On Purinergic Signalling, School of Acupuncture and Tuina, Chengdu University of Traditional Chinese Medicine, Chengdu, 610075, China.
In a recent article published in Nature Communications (Shigetomi et al Nat Commun 15(1):6525, 2024), Shigetomi et al. identified that upregulated astrocytic purinergic P2Y receptors (P2YR), acting via the downstream molecule, insulin-like growth factor binding protein 2 (IGFBP2), play a crucial role in neuronal hyperexcitability. In epilepsy and stroke models, P2YR-IGFBP2 signaling was found to mediate astrocyte-driven neuronal hyperexcitability and so is a new contributor to astrocyte-neuron communication.
View Article and Find Full Text PDFG protein-coupled purinergic P2Y receptors in infectious diseases.
Pharmacol Ther
January 2025
Laboratório de Neuroimunologia, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil. Electronic address:
The purinergic P2Y receptors comprise eight G-coupled receptor (GPCR) subtypes already identified (P2Y, P2Y, P2Y, P2Y, P2Y, P2Y). P2Y receptor physiological agonists are extracellular purine and pyrimidine nucleotides such as ATP (Adenosine triphosphate), ADP (Adenosine diphosphate), UTP (Uridine triphosphate), UDP (Uridine diphosphate), and UDP-glucose. These receptors are expressed in almost all cells.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!