Capping and Adenosine Metabolism. Genetic and Pharmacologic Studies

Overview

Journal J Exp Med

Specialties Allergy & Immunology
General Medicine

Date 1980 Jan 1

PMID 6985647

Citations 7

Authors

J Braun

F S Rosen

E R UNANUE

Affiliations

Soon will be listed here.

Abstract

Capping of membrane Ig was studied in lymphocytes treated with agents that interfere with adenosine metabolism. Treatment of murine or human B cells with combinations of coformycin, an inhibitor of adenosine deaminase, homocysteine, and adenosine impaired Ig capping. Inhibition of capping was also produced by 3-deazaadenosine, a specific inhibitor of adenosylhomocysteine hydrolase. The inhibitors did not affect capping of the Thy-1 antigen or membrane sites reactive with antilymphocyte antibodies. Two patients with a hereditary deficiency in adenosine deaminase had impairment of Ig capping. Such an impairment was not found in lymphocytes of two other patients who had undergone successful bone marrow transplantation. It is known that the addition of a calcium ionophore results in activation of microfilament function and in disruption of Ig caps. The ionophore effect was not inhibited by the agents mentioned above. Our results suggest that the inhibition of Ig capping during aberrant adenosine metabolism may be caused by a methylation defect preceding the contracticle event that produces membrane reorganization.

Citing Articles

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