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Related Experiment Videos

Relationship between membrane fluidity and adrenoceptor binding in depression.

J E Piletz1, M Sarasua, M Chotani

  • 1Dept. of Psychiatry, MetroHealth Medical Center, Cleveland, OH 44109.

Psychiatry Research
|July 1, 1991
PubMed
Summary
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Platelet membrane fluidity did not differ in depression. However, the relationship between alpha-2 adrenergic receptors and the cell membrane environment appears disrupted in depressed patients.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Psychiatry

Background:

  • Previous studies indicated higher 3H-para-aminoclonidine (3H-PAC) binding in platelets of depressed patients.
  • The role of platelet alpha-2 adrenergic receptors and their membrane environment in depression requires further investigation.

Purpose of the Study:

  • To investigate the relationship between alpha-2 adrenergic receptor binding and platelet membrane fluidity in depression.
  • To examine how desmethylimipramine treatment affects this relationship.

Main Methods:

  • Platelet membrane fluidity was measured using steady-state diphenylhexatriene (DPH) anisotropy.
  • Alpha-2 adrenergic receptor binding was assessed using 3H-PAC.
  • Measurements were taken before and during desmethylimipramine treatment in depressed patients.

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Main Results:

  • No significant differences in overall DPH membrane fluidity were observed between depressed patients and healthy subjects.
  • No changes in fluidity were linked to increased or normalized alpha-2 adrenergic receptor binding during treatment.
  • A correlation between lower intracellular membrane fluidity and higher 3H-PAC site-1 binding was found in healthy subjects, but not in depressed patients.

Conclusions:

  • Membrane fluidity per se does not explain altered alpha-2 adrenergic receptor binding in depression.
  • Depression may involve a disrupted relationship between alpha-2 adrenergic receptors and their surrounding membrane environment.
  • Desmethylimipramine treatment did not alter the observed membrane fluidity.