Show simple item record

dc.contributor.authorFenton, Richard A.
dc.contributor.authorTsimikas, Sotirios
dc.contributor.authorDobson, James G. Jr.
dc.date2022-08-11T08:10:16.000
dc.date.accessioned2022-08-23T17:02:05Z
dc.date.available2022-08-23T17:02:05Z
dc.date.issued1990-02-01
dc.date.submitted2008-06-12
dc.identifier.citationCirc Res. 1990 Feb;66(2):457-68.
dc.identifier.issn0009-7330 (Print)
dc.identifier.pmid2153472
dc.identifier.urihttp://hdl.handle.net/20.500.14038/44145
dc.description.abstractAdenosine (ADO) has an antiadrenergic action in the heart that causes an attenuation of contractile and metabolic responses elicited by beta-adrenergic stimulation. The effect of an increase in oxygen consumption elicited by either beta-adrenergic stimulation or an increase in contraction frequency on interstitial fluid and coronary effluent ADO levels was investigated in isolated perfused isovolumically contracting rat hearts. ADO in left ventricular surface transudates and coronary effluents was rendered fluorescent with chloroacetaldehyde, and the formed ethenoadenosine derivative was quantitated with high-performance liquid chromatography fluorescence detection. Heart preparation integrity was verified by determining the activities of lactate dehydrogenase and ADO deaminase in the transudates. Isoproterenol (10(-8) M) elicited a 45% increase in oxygen consumption and a 54% increase in developed left ventricular pressure in hearts paced at 240 beats/min. With isoproterenol the control transudate ADO concentration (304 pmol/ml) increased 493%, and the control effluent ADO concentration (48 pmol/ml) increased 259%. Increasing the contraction frequency from 180 to 300 beats/min in the presence of 10(-6) M propranolol increased oxygen consumption by 45% and decreased left ventricular pressure by 29%. With the increase in contraction frequency, the transudate ADO concentration did not increase significantly. However, the ADO concentration in the effluent was an average of 269% greater in hearts contracting at the higher frequency. Increasing the contraction frequency of hearts treated with both 10(-6) M propranolol and 10(-5) M atropine also had no significant effect on the level of transudate ADO. The effluent level of ADO increased only 78%. Levels of ADO in transudates were not significantly affected by mesothelial cell metabolism. These results suggest that the beta-adrenergic stimulation the interstitial level of ADO in the heart increases to levels that are sufficient to manifest its antiadrenergic effects. Furthermore, there is not always a correlation between the levels of ADO found in the interstitial and effluent fluid compartments.
dc.language.isoen_US
dc.relation<a href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=2153472&dopt=Abstract ">Link to article in PubMed</a>
dc.relation.urlhttp://circres.ahajournals.org/content/66/2/457.long
dc.subjectAdenosine
dc.subjectAdenosine Deaminase
dc.subjectAnimals
dc.subjectAtropine
dc.subjectExtracellular Space
dc.subjectGuinea Pigs
dc.subjectIsoproterenol
dc.subjectL-Lactate Dehydrogenase
dc.subjectMale
dc.subject*Myocardial Contraction
dc.subjectMyocardium
dc.subjectOxygen Consumption
dc.subjectPericardium
dc.subjectPropranolol
dc.subjectRats
dc.subjectRats, Inbred Strains
dc.subjectReceptors, Adrenergic, beta
dc.subjectCardiovascular Diseases
dc.subjectPhysiology
dc.titleInfluence of beta-adrenergic stimulation and contraction frequency on rat heart interstitial adenosine
dc.typeJournal Article
dc.source.journaltitleCirculation research
dc.source.volume66
dc.source.issue2
dc.identifier.legacycoverpagehttps://escholarship.umassmed.edu/physio_pp/27
dc.identifier.contextkey523442
html.description.abstract<p>Adenosine (ADO) has an antiadrenergic action in the heart that causes an attenuation of contractile and metabolic responses elicited by beta-adrenergic stimulation. The effect of an increase in oxygen consumption elicited by either beta-adrenergic stimulation or an increase in contraction frequency on interstitial fluid and coronary effluent ADO levels was investigated in isolated perfused isovolumically contracting rat hearts. ADO in left ventricular surface transudates and coronary effluents was rendered fluorescent with chloroacetaldehyde, and the formed ethenoadenosine derivative was quantitated with high-performance liquid chromatography fluorescence detection. Heart preparation integrity was verified by determining the activities of lactate dehydrogenase and ADO deaminase in the transudates. Isoproterenol (10(-8) M) elicited a 45% increase in oxygen consumption and a 54% increase in developed left ventricular pressure in hearts paced at 240 beats/min. With isoproterenol the control transudate ADO concentration (304 pmol/ml) increased 493%, and the control effluent ADO concentration (48 pmol/ml) increased 259%. Increasing the contraction frequency from 180 to 300 beats/min in the presence of 10(-6) M propranolol increased oxygen consumption by 45% and decreased left ventricular pressure by 29%. With the increase in contraction frequency, the transudate ADO concentration did not increase significantly. However, the ADO concentration in the effluent was an average of 269% greater in hearts contracting at the higher frequency. Increasing the contraction frequency of hearts treated with both 10(-6) M propranolol and 10(-5) M atropine also had no significant effect on the level of transudate ADO. The effluent level of ADO increased only 78%. Levels of ADO in transudates were not significantly affected by mesothelial cell metabolism. These results suggest that the beta-adrenergic stimulation the interstitial level of ADO in the heart increases to levels that are sufficient to manifest its antiadrenergic effects. Furthermore, there is not always a correlation between the levels of ADO found in the interstitial and effluent fluid compartments.</p>
dc.identifier.submissionpathphysio_pp/27
dc.contributor.departmentDepartment of Physiology
dc.source.pages457-68


This item appears in the following Collection(s)

Show simple item record