Altered β adrenergic receptor function in subjects with symptomatic mitral valve prolapse

A. Anwar, S. R. Kohn, J. F. Dunn, T. K. Hymer, G. T. Kennedy, M. H. Crawford, R. A. O'Rourke, M. S. Katz

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Individuals with mitral valve prolapse (MVP) frequently show symptoms of a hyperadrenergic state. β adrenergic receptor characteristics were compared in the lymphocytes of subjects with symptomatic MVP and control subjects during rest and exercise. At rest, the proportion of receptors binding agonist with high affinity, as determined from isoproterenol competition for (-)[125I]-iodopindolol binding sites, was greater in MVP subjects than in controls. With exercise, the proportion of high-affinity receptors in MVP subjects decreased to control levels. Isoproterenol stimulation of lymphocyte 3',5'-cyclic adenosine monophosphate (cyclic AMP) also was greater in MVP subjects than in controls at rest, but not during exercise. Plasma catecholamine concentrations in MVP subjects were normal during both rest and exercise. Unlike exercise, isoproterenol infusion elicited clinical manifestations of increased adrenergic responsiveness in MVP subjects. The β receptor in exercised MVP subjects exhibited unusually high affinity agonist binding (i.e. a lower dissociation constant K(H) than in either the same subjects at rest or exercised controls) and also abnormal coupling to the stimulatory guanine nucleotide-binding regulatory protein (G(S)) of adenylate cyclase, as reflected by the inability of guanine nucleotide to convert the receptor to a low-affinity state. These findings suggest that functional alteration of the β adrenergic receptor, in the absence of abnormal plasma catecholamine levels, might contribute to the hyper-adrenergic state of MVP subjects at rest. However, desensitization of high affinity β receptors or altered receptor-G(S) coupling might preserve normal adrenergic responsiveness during exercise.

Original languageEnglish (US)
Pages (from-to)89-97
Number of pages9
JournalAmerican Journal of the Medical Sciences
Volume302
Issue number2
StatePublished - 1991
Externally publishedYes

Fingerprint

Mitral Valve Prolapse
Adrenergic Receptors
Isoproterenol
Adrenergic Agents
Catecholamines
Guanine Nucleotides
Protein S
Lymphocyte Activation
GTP-Binding Proteins
Adenylyl Cyclases
Cyclic AMP
Carrier Proteins
Binding Sites
Lymphocytes

Keywords

  • β adrenergic receptor
  • Adenylate cyclase
  • Guanine nucleotide- binding protein
  • Isoproterenol
  • Lymphocyte
  • Mitral valve prolapse

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Anwar, A., Kohn, S. R., Dunn, J. F., Hymer, T. K., Kennedy, G. T., Crawford, M. H., ... Katz, M. S. (1991). Altered β adrenergic receptor function in subjects with symptomatic mitral valve prolapse. American Journal of the Medical Sciences, 302(2), 89-97.

Altered β adrenergic receptor function in subjects with symptomatic mitral valve prolapse. / Anwar, A.; Kohn, S. R.; Dunn, J. F.; Hymer, T. K.; Kennedy, G. T.; Crawford, M. H.; O'Rourke, R. A.; Katz, M. S.

In: American Journal of the Medical Sciences, Vol. 302, No. 2, 1991, p. 89-97.

Research output: Contribution to journalArticle

Anwar, A, Kohn, SR, Dunn, JF, Hymer, TK, Kennedy, GT, Crawford, MH, O'Rourke, RA & Katz, MS 1991, 'Altered β adrenergic receptor function in subjects with symptomatic mitral valve prolapse', American Journal of the Medical Sciences, vol. 302, no. 2, pp. 89-97.
Anwar A, Kohn SR, Dunn JF, Hymer TK, Kennedy GT, Crawford MH et al. Altered β adrenergic receptor function in subjects with symptomatic mitral valve prolapse. American Journal of the Medical Sciences. 1991;302(2):89-97.
Anwar, A. ; Kohn, S. R. ; Dunn, J. F. ; Hymer, T. K. ; Kennedy, G. T. ; Crawford, M. H. ; O'Rourke, R. A. ; Katz, M. S. / Altered β adrenergic receptor function in subjects with symptomatic mitral valve prolapse. In: American Journal of the Medical Sciences. 1991 ; Vol. 302, No. 2. pp. 89-97.
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