Abstract:
:Sphingosine-1-phosphate (S1P) is a lysophospholipid mediator with diverse biological function mediated by S1P1-5 receptors. Whereas S1P was shown to protect the heart against ischemia/reperfusion (I/R) injury, other studies highlighted its vasoconstrictor effects. We aimed to separate the beneficial and potentially deleterious cardiac effects of S1P during I/R and identify the signaling pathways involved. Wild type (WT), S1P2-KO and S1P3-KO Langendorff-perfused murine hearts were exposed to intravascular S1P, I/R, or both. S1P induced a 45% decrease of coronary flow (CF) in WT-hearts. The presence of S1P-chaperon albumin did not modify this effect. CF reduction diminished in S1P3-KO but not in S1P2-KO hearts, indicating that in our model S1P3 mediates coronary vasoconstriction. In I/R experiments, S1P3 deficiency had no influence on postischemic CF but diminished functional recovery and increased infarct size, indicating a cardioprotective effect of S1P3. Preischemic S1P exposure resulted in a substantial reduction of postischemic CF and cardiac performance and increased the infarcted area. Although S1P3 deficiency increased postischemic CF, this failed to improve cardiac performance. These results indicate a dual role of S1P3 involving a direct protective action on the myocardium and a cardiosuppressive effect due to coronary vasoconstriction. In acute coronary syndrome when S1P may be released abundantly, intravascular and myocardial S1P production might have competing influences on myocardial function via activation of S1P3 receptors.
journal_name
Cellsjournal_title
Cellsauthors
Wafa D,Koch N,Kovács J,Kerék M,Proia RL,Tigyi GJ,Benyó Z,Miklós Zdoi
10.3390/cells9081770subject
Has Abstractpub_date
2020-07-24 00:00:00issue
8issn
2073-4409pii
cells9081770journal_volume
9pub_type
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