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M9650938.TXT
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1996-03-30
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Document 0938
DOCN M9650938
TI Effects of polyacrylic polymers on the lumenal proteolysis of peptide
drugs in the colon.
DT 9505
AU Bai JP; Chang LL; Guo JH; College of Pharmacy, University of Minnesota,
Minneapolis 55455,; USA.
SO J Pharm Sci. 1995 Nov;84(11):1291-4. Unique Identifier : AIDSLINE
MED/96139277
AB The in-vitro effectiveness of polyacrylic acid polymers in inhibiting
degradation of insulin, calcitonin, and insulin-like growth factor-I by
colonic lumenal contents was determined. Further, the effect of Carbopol
974P, a polyacrylic acid polymer, on colonic absorption of insulin in
rats was studied. The results revealed that Carbopol 934P, 971P, and
974P all strongly inhibited microbial proteolytic activities against
insulin, calcitonin, and insulin-like growth factor-I. Inhibition by
Carbopol polymers was complete or almost complete when the concentration
of each polymer in saline or in 50 or 100 mM Tris buffer was 0.4%, where
the pH of the medium was lower than 5. The extensive inhibition by these
polyacrylic acid polymers seems to correlate with their ability to
acidify the incubation medium. Further, in-situ absorption studies
showed that Carbopol 974P increased the pharmacological availability of
colonic insulin. In summary, Carbopol polymers are useful in minimizing
colonic proteolysis of peptide drugs.
DE Animal Calcitonin/PHARMACOKINETICS Colon/DRUG EFFECTS/*METABOLISM
Hydrogen-Ion Concentration Hypoglycemic Agents/PHARMACOKINETICS
Insulin/PHARMACOKINETICS Insulin-Like Growth Factor I/PHARMACOKINETICS
Intestinal Absorption/DRUG EFFECTS Male Methylcellulose/*ANALOGS &
DERIVATIVES/PHARMACOLOGY Peptides/*PHARMACOKINETICS Pharmaceutic
Aids/*PHARMACOLOGY Polyvinyls/*PHARMACOLOGY Protease
Inhibitors/*PHARMACOLOGY Rats Rats, Sprague-Dawley JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).