{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,20]],"date-time":"2026-07-20T11:13:07Z","timestamp":1784545987113,"version":"3.55.0"},"reference-count":100,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"1","license":[{"start":{"date-parts":[[2025,1,1]],"date-time":"2025-01-01T00:00:00Z","timestamp":1735689600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["www.ahajournals.org"],"crossmark-restriction":true},"short-container-title":["ATVB"],"published-print":{"date-parts":[[2025,1]]},"abstract":"<jats:sec>\n            <jats:title>BACKGROUND:<\/jats:title>\n            <jats:p>The protease thrombin, which elicits multiple physiological and pathological effects on vascular endothelial cells (ECs), can signal through PARs (protease-activated receptors) 1 and 4. PAR1 is a high-affinity thrombin receptor known to signal on ECs, whereas PAR4 is a low-affinity thrombin receptor, and evidence for its expression and function on ECs is mixed. This study aims to exploit the high levels of thrombin generation and hepatic vascular dysfunction that occur during acetaminophen (APAP) overdose to determine (1) whether hepatic endothelial PAR4 is a functional receptor, and (2) the endothelial-specific functions for PAR1 and PAR4 in a high thrombin and pathological setting.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>METHODS:<\/jats:title>\n            <jats:p>\n              We generated mice with conditional deletion of\n              <jats:italic>Par1\/Par4<\/jats:italic>\n              in ECs and overdosed them with APAP. Hepatic vascular permeability, erythrocyte accumulation in the liver, thrombin generation, and liver function were assessed following overdose. Additionally, we investigated the expression levels of endothelial PARs and how they influence transcription in APAP-overdosed liver ECs using endothelial translating ribosome affinity purification followed by next-generation sequencing.\n            <\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>RESULTS:<\/jats:title>\n            <jats:p>\n              We found that mice deficient in high-expressing endothelial\n              <jats:italic>Par1<\/jats:italic>\n              or low-expressing\n              <jats:italic>Par4<\/jats:italic>\n              had equivalent reductions in APAP-induced hepatic vascular instability, although mice deficient for both receptors had lower vascular permeability at an earlier timepoint after APAP overdose than either of the single mutants. Additionally, mice with loss of both endothelial\n              <jats:italic>Par1<\/jats:italic>\n              and\n              <jats:italic>Par4<\/jats:italic>\n              had reduced thrombin generation after APAP overdose, suggesting decreased hypercoagulability. Last, we found that endothelial PAR1\u2014but not PAR4\u2014can regulate transcription in hepatic ECs.\n            <\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>CONCLUSIONS:<\/jats:title>\n            <jats:p>Low-expressing PAR4 can react similarly to high-expressing PAR1 in APAP-overdosed hepatic ECs, demonstrating that PAR4 is a potent thrombin receptor. Additionally, these receptors are functionally redundant but act divergently in their expression and ability to influence transcription in hepatic ECs.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1161\/atvbaha.124.321353","type":"journal-article","created":{"date-parts":[[2024,10,3]],"date-time":"2024-10-03T09:00:33Z","timestamp":1727946033000},"page":"53-71","update-policy":"https:\/\/doi.org\/10.1161\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":13,"title":["Acetaminophen Overdose Reveals PAR4 as a Low-Expressing but Potent Receptor on the Hepatic Endothelium in Mice"],"prefix":"10.1161","volume":"45","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4501-349X","authenticated-orcid":true,"given":"Rahul","family":"Rajala","sequence":"first","affiliation":[{"name":"Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City (R.R., A.C.A.C., C.T.G.)."},{"name":"Department of Cell Biology, University of Oklahoma Health Sciences Center, 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