The formation and nature of the mixed valence copper-D-penicillamine-chloride cluster in aqueous solution and its relevance to the treatment of Wilson's disease.

Abstract:

:Complex formation between D-penicillamine (Pen) and copper(II) ions has been studied under simulated physiological conditions in both the presence and absence of the blood plasma constituents albumin, alanine, histidine, and zinc(II). Chromatographic and uv/vis and electron spin resonance (esr) spectroscopic methods were used. The major species formed, at neutral pH and 0.15 mol dm-3 NaCl, is the violet species which is shown to have the same stoichiometry as the recently reported solid-state complex, i.e., [Cu8I Cu6II (Pen)12 Cl] 5-. The rate of formation of this species (MVC) is shown to be dependent on the Cu concentration, Cu:Pen ratio, relative Cl- ion concentration, pH, and temperature. Formation is inhibited by the presence of O2 and biological chelates. At the concentration levels found in blood plasma it is unlikely that the MVC ion has any significance in the therapeutic action of penicillamine in the treatment of Wilson's disease. Reexamination of the aqueous Cu-albumin-pen system reinforces earlier findings that pen is unable to mobilize Cu that is bound to albumin. Significant binding of pen to the protein is observed is not related to any protein-bound copper ions. Evidence that ternary complexes of the type amino acid-Cu-Pen can form in blood plasma is presented. These are unlikely, however, to be physiologically significant and the copper depletion induced by Pen in Wilson's disease cases must be elsewhere than in the blood plasma compartment.

journal_name

J Inorg Biochem

authors

Laurie SH,Prime DM

doi

10.1016/s0162-0134(00)80020-3

subject

Has Abstract

pub_date

1979-11-01 00:00:00

pages

229-39

issue

3

eissn

0162-0134

issn

1873-3344

pii

S0162-0134(00)80020-3

journal_volume

11

pub_type

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