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dc.contributor.authorRose'Meyer, RB
dc.contributor.authorHarrison, GJ
dc.contributor.authorHeadrick, JP
dc.contributor.editorM C Michel
dc.date.accessioned2017-05-03T11:37:01Z
dc.date.available2017-05-03T11:37:01Z
dc.date.issued2003
dc.date.modified2010-07-30T07:19:03Z
dc.identifier.issn0028-1298
dc.identifier.doi10.1007/s00210-002-0678-z
dc.identifier.urihttp://hdl.handle.net/10072/6191
dc.description.abstractIn this study, we investigated the effect of noradrenaline depletion on contractile recovery in rat isolated heart following myocardial ischaemia. Groups tested included control tissues and hearts from reserpinised rats. Reserpine 1 mg/kg s.c. was injected into rats 18 to 24 h prior to experiments. Hearts underwent 15 min global normothermic ischaemia followed by 30 min reperfusion. Functional data (end diastolic pressure (EDP), heart rate (HR), left ventricular developed pressure (LVDP), dP/dtmax, dP/dtmin) showed that contractile function following ischaemia-reperfusion is unaffected by reserpinisation. However, pre- and post-ischaemic coronary flow rates (CFR) were increased by 16 to 38% in hearts from reserpinised rats versus control hearts. Pre-ischaemic CFRs in control hearts (11.17-0.67 ml/inm1.g tissuem1, n=9) were significantly lower then CFRs derived from reserpinised rat hearts (14.57-0.72 ml/minm1/g tissuem1, n=10). Post-ischaemic reactive hyperaemia was evident in all groups. CFRs in reserpinised hearts remained elevated when compared to pre-ischaemic values through reperfusion (P<0.05). Reserpine treatment did not significantly alter pre- or post-ischaemic adenosine efflux. The A2B adenosine receptor antagonist alloxazine (10 wM) attenuated pre- and post-ischaemic CFRs in both control and reserpinised hearts (P<0.05) without altering the hyperaemic response while the A2A adenosine receptor antagonist 8-(3-chlorostyryl) caffeine (1 wM) did not alter CFRs in both groups. The A3 adenosine receptor antagonist MRS1191 (0.1 wM) increased CFR in control and reserpinised hearts (P<0.05). Catecholamine depletion with reserpinisation enhances the responsiveness of the coronary resistance vessels to endogenous adenosine through activation of the A2B adenosine receptor.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoeng
dc.publisherSpringer-Verlag
dc.publisher.placeGermany
dc.relation.ispartofpagefrom266
dc.relation.ispartofpageto273
dc.relation.ispartofjournalNaunyn-Schmiedeberg's Archives of Pharmacology
dc.relation.ispartofvolume367
dc.subject.fieldofresearchPharmacology and pharmaceutical sciences
dc.subject.fieldofresearchMedical physiology
dc.subject.fieldofresearchcode3214
dc.subject.fieldofresearchcode3208
dc.titleEnhanced adenosine A2B mediated coronary response in reserpinised rat heart.
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.facultyGriffith Health, School of Medical Science
gro.date.issued2003
gro.hasfulltextNo Full Text
gro.griffith.authorHeadrick, John P.
gro.griffith.authorHarrison, Glenn J.
gro.griffith.authorRose'Meyer, Roselyn B.


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