Covalent binding of a bucillamine derivative with albumin in sera from healthy subjects and patients with various diseases.
OBJECTIVE
To investigate the difference of pharmacokinetics of thiol-containing drugs in various disease states, we studies the covalent binding of SA3786, a bucillamine derivative, with proteins in patient serum compared with that in healthy serum.


METHODS
Sera from healthy volunteers and patients of various diseases were supplied by the Japanese Red Cross Kumamoto Hospital. For the formation of conjugate experiments, SA3786 was added to a final concentration of 7 x 10(-4)M. After 6 h incubation at 37 degrees C, HPLC analysis of 5 microliters aliquots of each sample was performed using a column of N-methylpyridinium polymer (4VP-Me).


RESULTS
The extent of HSA-SA3786 conjugate formation was found to be lower in the sera from healthy volunteers (control) than those from patients of various diseases. Especially high reactivity with SA3786 was observed in sera from rheumatic patients and hepatic patients. With the exception of the fraction of mercaptoalbumin (fHMA), none of the parameters showed a good correlation with conjugate formation.


CONCLUSIONS
The parameter fHMA must be considered to be one of the most important factors in formation of conjugates between plasma protein and thiol compounds. However, other factors may be involved in addition to fHMA although the nature of these factors is not clear.
Narazaki
R
R
Faculty of Pharmaceutical Sciences, Kumamoto University, Japan.
Otagiri
M
M
D002087:Butyrates / Q000097:blood* / Q000493:pharmacokinetics; D003545:Cysteine / Q000031:analogs & derivatives* / Q000097:blood / Q000493:pharmacokinetics; D003920:Diabetes Mellitus / Q000097:blood; D006505:Hepatitis / Q000097:blood; D006801:Humans; D007676:Kidney Failure, Chronic / Q000097:blood; D011485:Protein Binding; D006435:Renal Dialysis; D012216:Rheumatic Diseases / Q000097:blood; D012709:Serum Albumin / Q000378:metabolism*; D013438:Sulfhydryl Compounds / Q000097:blood / Q000493:pharmacokinetics
D002087:Butyrates; C106257:SA 3786; D012709:Serum Albumin; D013438:Sulfhydryl Compounds; D003545:Cysteine