{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T12:07:23Z","timestamp":1789733243459,"version":"4.0.1"},"reference-count":60,"publisher":"Wiley","license":[{"start":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T00:00:00Z","timestamp":1789689600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"},{"start":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T00:00:00Z","timestamp":1789689600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100001505","name":"Health Research Council of New Zealand","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100001505","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001516","name":"National Heart Foundation of New Zealand","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100001516","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["physoc.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["The Journal of Physiology"],"abstract":"\n Abstract<\/jats:title>\n \n Exercise intolerance in heart failure with preserved ejection fraction (HFpEF) is linked to impaired vascular regulation and exaggerated autonomic responses. Although sensory afferent signalling via P\n 2<\/jats:sub>\n X\n 3<\/jats:sub>\n receptors (P\n 2<\/jats:sub>\n X\n 3<\/jats:sub>\n Rs) contributes to exaggerated cardiovascular reflex activity in hypertension, its role in mediating haemodynamic limitation during HFpEF is unknown. We tested whether selective P\n 2<\/jats:sub>\n X\n 3<\/jats:sub>\n R antagonism improved blood pressure and exercise haemodynamics in a conscious ovine model of hypertensive HFpEF. Female hypertensive HFpEF sheep and age\u2010matched sham controls were instrumented for chronic measurement of arterial pressure, cardiac output and blood flow to the hindlimbs, kidney and coronary vasculature. Haemodynamic responses were assessed at rest and during graded treadmill exercise before and after systemic selective P\n 2<\/jats:sub>\n X\n 3<\/jats:sub>\n R blockade. Postexercise heart\u2011rate recovery was assessed as an index of physical fitness. L4 dorsal root ganglia (DRG) were analysed for gene expression related to neuronal excitability. P\n 2<\/jats:sub>\n X\n 3<\/jats:sub>\n R antagonism lowered resting mean arterial pressure (from 116\u2009\u00b1\u200910.2 to 110\u2009\u00b1\u20097.8\u00a0mmHg,\n P\u00a0=\u00a0<\/jats:italic>\n 0.014), increased hindlimb blood flow at peak exercise (vehicle 4.4\u2009\u00b1\u20092.6\n vs<\/jats:italic>\n . P\n 2<\/jats:sub>\n X\n 3<\/jats:sub>\n R blockade 5.2\u2009\u00b1\u20092.9 L\/min,\n P<\/jats:italic>\n \u00a0=\u00a00.009) and improved postexercise heart rate recovery in HFpEF sheep, despite no difference in P\n 2<\/jats:sub>\n X\n 3<\/jats:sub>\n R mRNA expression compared with sham controls. These findings demonstrate that P\n 2<\/jats:sub>\n X\n 3<\/jats:sub>\n R signalling contributes to resting hypertension and impaired exercise haemodynamics in hypertensive HFpEF. The improvement in peak exercise haemodynamics in the absence of altered gene expression suggests receptor hypersensitivity or posttranslational gain of function in HFpEF. These findings identify P\n 2<\/jats:sub>\n X\n 3<\/jats:sub>\n R signalling as a potential mechanistic contributor to exercise limitation in HFpEF and support further investigation of this pathway as a possible therapeutic strategy.\n \n \n image<\/jats:alt-text>\n <\/jats:graphic>\n <\/jats:boxed-text>\n <\/jats:p>\n <\/jats:sec>\n \n Key points<\/jats:title>\n \n \n \n Exercise intolerance is an important symptom in heart failure with preserved ejection fraction (HFpEF) and is linked to impaired autonomic responses.<\/jats:p>\n <\/jats:list-item>\n \n \n Although purinergic receptors (P\n 2<\/jats:sub>\n X\n 3<\/jats:sub>\n \u00a0subtype) have been linked to autonomic reflex control, the role of these receptors in mediating the haemodynamic limitation during HFpEF is unknown.\n <\/jats:p>\n <\/jats:list-item>\n \n \n We used a preclinical large\u2010animal model of hypertensive HFpEF to show that P\n 2<\/jats:sub>\n X\n 3<\/jats:sub>\n R signalling contributes to resting hypertension. Blockade of these receptors improved hindlimb blood flow during peak exercise and improved heart rate recovery.\n <\/jats:p>\n <\/jats:list-item>\n \n \n Our findings identify P\n 2<\/jats:sub>\n X\n 3<\/jats:sub>\n R signalling as a potential mechanistic contributor to exercise limitation in HFpEF.\n <\/jats:p>\n <\/jats:list-item>\n <\/jats:list>\n <\/jats:p>\n <\/jats:sec>","DOI":"10.1113\/jp291306","type":"journal-article","created":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T11:50:26Z","timestamp":1789732226000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["P\n 2<\/sub>\n X\n 3<\/sub>\n receptor antagonism improves hindlimb blood flow during exercise in a conscious ovine model of hypertensive heart failure with preserved ejection fraction"],"prefix":"10.1113","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-1863-7452","authenticated-orcid":false,"given":"Mridula","family":"Pachen","sequence":"first","affiliation":[{"name":"Department of Physiology, Faculty of Medical and Health Sciences University of Auckland Auckland New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Siyi","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Physiology, Faculty of Medical and Health Sciences University of Auckland Auckland New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joshua W.\u2010H.","family":"Chang","sequence":"additional","affiliation":[{"name":"Department of Physiology, Faculty of Medical and Health Sciences University of Auckland Auckland New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9635-8872","authenticated-orcid":false,"given":"Audrys","family":"Pauza","sequence":"additional","affiliation":[{"name":"Department of Physiology, Faculty of Medical and Health Sciences University of Auckland Auckland New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0671-2220","authenticated-orcid":false,"given":"Julia","family":"Shanks","sequence":"additional","affiliation":[{"name":"Department of Physiology, Faculty of Medical and Health Sciences University of Auckland Auckland New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-2150-7541","authenticated-orcid":false,"given":"Bindu","family":"George","sequence":"additional","affiliation":[{"name":"Department of Physiology, Faculty of Medical and Health Sciences University of Auckland Auckland New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7410-2913","authenticated-orcid":false,"given":"Julian","family":"Paton","sequence":"additional","affiliation":[{"name":"Department of Physiology, Faculty of Medical and Health Sciences University of Auckland Auckland New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8284-1692","authenticated-orcid":false,"given":"Rohit","family":"Ramchandra","sequence":"additional","affiliation":[{"name":"Department of Physiology, Faculty of Medical and Health Sciences University of Auckland Auckland New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,18]]},"reference":[{"issue":"9974","key":"e_1_2_6_2_1","doi-asserted-by":"crossref","first-page":"1198","DOI":"10.1016\/S0140-6736(14)61255-1","article-title":"P2\u00d73 receptor antagonist (AF\u2010219) in refractory chronic cough: A randomised, double\u2010blind, placebo\u2010controlled phase 2 study","volume":"385","author":"Abdulqawi R.","year":"2015","journal-title":"The Lancet"},{"issue":"4","key":"e_1_2_6_3_1","doi-asserted-by":"crossref","first-page":"H806","DOI":"10.1152\/ajpheart.00450.2023","article-title":"Evidence of impaired functional sympatholysis in patients with heart failure with preserved ejection fraction","volume":"325","author":"Alpenglow J. 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