Montreal platelet syndrome: a defect in calcium-activated neutral proteinase (calpain).

Abstract:

:Platelets from patients with Montreal platelet syndrome (MPS) consistently display a defect in the mechanisms that regulate platelet size during shape change and undergo spontaneous aggregation and stir-induced microaggregate formation. We now provide data that the surface glycoprotein composition of MPS platelets is indistinguishable from that of normal platelets. However, a defect in calcium-activated neutral proteinase (calpain) was detected in MPS platelets. The specific activity of calpain in the cytosolic fraction of platelets from four MPS patients was found to be only 30% of that in platelets from normal control donors (n = 18, P less than .001). Additionally, platelets from MPS patients (n = 3) contained only 50% (P less than .001) of the calpain I catalytic subunit antigen found in platelets from normal control donors (n = 9). Platelets from the asymptomatic father/grandfather of the MPS patients had normal amounts of both total calpain proteolytic activity and calpain I catalytic subunit antigen. This represents the first report of a defect in calpain in human cells. The abnormally low calpain activity in MPS platelets may account for the platelet defects characteristic of this disorder.

journal_name

Blood

journal_title

Blood

authors

Okita JR,Frojmovic MM,Kristopeit S,Wong T,Kunicki TJ

subject

Has Abstract

pub_date

1989-08-01 00:00:00

pages

715-21

issue

2

eissn

0006-4971

issn

1528-0020

journal_volume

74

pub_type

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