Defective human erythrocyte uroporphyrinogen decarboxylase in familial porphyria cutanea tarda: the metabolic lesion or the result of endogenous porphyrinemia?

Abstract:

:We have demonstrated that oral charcoal therapy is as effective as therapeutic phlebotomy in reducing porphyrinemia in porphyria cutanea tarda. The effects of immediate and sustained reduction of porphyrinemia on the catalytic properties of partially purified (approximately 200-fold) preparations of red cell uroporphyrinogen decarboxylase of a patient with familial porphyria cutanea tarda were studied. All populations of the patient's red cells exhibited defective enzyme activity, and the apparent Michaelis constants (Km) determined with penta-, hepta-, and octa-carboxylic I porphyrinogen substrates were approximately 3-4 times higher as compared to the normal controls. Mixing experiments (normal and defective enzyme), and preincubation of the normal enzyme with porphyric plasma prior to purification, yielded data supporting the concept that the catalytic defects of red cell uroporphyrinogen decarboxylase in familial porphyria cutanea tarda are independent of interactions between circulating endogenous porphyrins and the enzyme.

authors

Mukerji SK,Pimstone NR

doi

10.1016/0006-291x(88)90646-8

subject

Has Abstract

pub_date

1988-07-15 00:00:00

pages

39-46

issue

1

eissn

0006-291X

issn

1090-2104

pii

0006-291X(88)90646-8

journal_volume

154

pub_type

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