ArticleProceedings of the National Academy of Sciences of the United States of America2009
Functional interaction between native G protein-coupled purinergic receptors in Xenopus follicles.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed, 14 citations in OpenAlex.
- Role of Adenosine and Purinergic Receptors in Myocardial Infarction: Focus on Different Signal Transduction Pathways.Biomedicines · 2021Review
- Tonic Calcium-Activated Chloride Current Sustained by ATP Release and Highly Desensitizing Human P2X1 Receptors.Neuroscience · 2020Article
- Purinergic signalling in the reproductive system in health and disease.Purinergic signalling · 2014Review
- Functional expression and intracellular signaling of UTP-sensitive P2Y receptors in theca-interstitial cells.Reproductive biology and endocrinology : RB&E · 2010Article
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Authors and funding
3 authors at 1 institution in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Purinergic receptors are expressed in the membrane of the follicular cell layer that communicates with the Xenopus oocyte. Adenosine (Ado) generates a cAMP-dependent K(+) current (I(K,cAMP)), whereas ATP activates a Cl(-) current (F(Cl)) and has a dual effect on I(K,cAMP), provoking both its activation and inhibition. Here, purinergic responses were studied electrophysiologically, first in the whole follicle (w.f.), and then in the same follicle after removal of its epithelium/theca layers (e.t.r. follicle). Responses were analyzed as the ratio of the current amplitudes (i(etr)/i(wf)) in the two preparations. For ATP activation of I(K,cAMP) and F(Cl), the ratios i(etr)/i(wf) were 0.053 and 22, respectively, whereas that for Ado was 0.75. Thus, epithelium/theca removal drastically altered the ATP response, suggesting a change in the signaling pathway that correlated with changes in the pharmacological characteristics: the half-maximal effective concentration for activation of the main current in w.f. (I(K,cAMP)) was 14 +/- 3.8 microM [Hill coefficient (nH) = 2.7 +/- 0.61], and that in e.t.r. follicles (F(Cl)) was 1.8 +/- 0.68 microM (nH = 0.76 +/- 0.09), whereas Ado-response parameters did not change. Responses to UTP and beta,gamma-methylene-ATP, specific agonists for I(K,cAMP) inhibition and activation, respectively, indicated that in e.t.r. follicles inhibition increased and activation decreased drastically. Thus, purinergic responses were not independent; instead, they were functionally linked. We hypothesize that this property was due to direct interactions between receptors for Ado (A2 subtype) and ATP (P2Y subtype) in the Xenopus follicle.
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