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Biomedical subjects

Z OVARY

Publications and source records attributed to Z OVARY.

At least 37 records · Page 2Linked to original sources
PubMed1961

Studies on the mechanism of the formation of the penicillin antigen. III. The N-(D-alpha-benzylpenicilloyl) group as an antigenic determinant responsible for hypersensitivity to penicillin G.

An excess of D-benzylpenicillenic acid (BPE) was reacted with human gamma-globulin, human serum albumin, gelatin, and poly-L-lysine in aqueous solution buffered at pH 7.5-8.0. Under these conditions, BPE reacted predominantly with lysine epsilon-amino groups of the proteins to form the mixture of diastereomers of epsilon-N-(D-alpha-benzylpenicilloyl)-lysine groups (Di-BPO-Lys). BPE reacted also, but to a considerably smaller extent, with cystine disulfide linkages of human gamma-globulin and human serum albumin to form D-benzylpenicillenic acid-cysteine mixed disulfide groups (BPE-SS-Cys). Conjugates containing large numbers of BPE or D-penicillamine mixed disulfide groups were prepared by reaction of BPE or D-penicillamine with thiolated human gamma-globulin under mild oxidizing conditions. Anti-penicillin antibodies were produced in rabbits by immunization with either potassium penicillin G (PG) or a preincubated mixture of PG with normal rabbit serum (PG-NRS) in complete Freund's adjuvant. Specific precipitation analyses in aqueous and gel media (Ouchterlony), PCA analyses, and specific inhibition of these reactions with haptens were carried out on the rabbit anti-PG and anti-(PG-NRS) sera, using the above conjugates as antigens. The anti-penicillin antibodies were found to be directed against the diastereomeric mixture of N-(D-alpha-benzylpenicilloyl) groups, predominantly the Di-BPO-Lys groups. By these techniques, no antibodies directed against the BPE-mixed disulfide or the D-penicillamine mixed disulfide groups were detected. Three out of six patients with histories of allergic reactions to PG responded with wheal-and-erythema reactions to the N-(D-alpha-benzylpenicilloyl) (BPO) groups contained in BPE-human gamma globulin conjugate. Another such patient exhibited serum antibodies specific for the BPO group. One patient being treated with 25 gm per day of PG showed the presence of non-dialyzable antigenic BPO-conjugates in his serum. These results demonstrate that the diastereomeric BPO groups (predominantly Di-BPO-Lys groups) are major antigenic determinant groups responsible for PG hypersensitivity in rabbits and human beings. The possible clinical usefulness of multivalent Di-BPO conjugates and univalent Di-BPO haptens is discussed.

Animals↗
PubMed1960

Anuphylactic reactions in the skin of the guinea pig with high and low molecular weight antibodies and gamma globulins.

High molecular weight (19S) gamma-globulin produces passive cutaneous anaphylaxis (PCA) reactions with its specific antiserum only when it is used as intravenous antigen. Reversed PCA reactions cannot be produced when the 19S protein is injected intradermally in contradistinction to the results with 7S gamma-globulin. Antibodies of the high molecular weight class, when injected intradermally, also failed to give PCA reactions following antigen injection. Heterophile antibodies from the sera of patients with infectious mononucleosis, demonstrated to be entirely of the 19S type, gave negative reactions, while 7S heterophile antibodies from guinea pig did give reactions following intravenous injection of sheep cells. Anti-B isoagglutinins of the 19S class failed to react, while those of the 7S class of similar titer gave clear reactions following the injection of B substance. Evidence was obtained that 19S antibodies were capable of inhibiting the PCA reactions obtained with the 7S type, indicating that interaction with antigen occurred. The failure to elicit PCA reactions appeared to be due to an inability to fix to guinea pig tissues in a manner similar to that known for 7S antibodies and gamma-globulin.

Animals↗