Arginine vasopressin-binding peptides derived from the bovine and rat genomes differ in their abilities to block arginine vasopressin modulation of murine immune function

Journal of Neuroimmunology
B A Torres, H M Johnson

Abstract

Previously we reported on a nonapeptide (binding peptide) derived by reading the complementary DNA strand of the bovine arginine vasopressin (AVP) gene in the 3'5' direction that specifically blocks the AVP helper signal for gamma-interferon (IFN gamma) production by helper cell-depleted mouse spleen cultures. Bovine 5'3' AVP-binding peptide, however, did not block AVP activity. We report here on the relative abilities of 5'3' and 3'5' AVP-binding peptides derived from the bovine and rat AVP genes to block the AVP helper signal for IFN gamma production. The sequences of the bovine and rat 5'3' AVP-binding peptides differ by two amino acids, whereas the 3'5' AVP-binding peptides derived from both genes are the same. In contrast to the lack of blocking activity of the bovine 5'3' AVP-binding peptide, the rat 5'3' AVP-binding peptide was almost as effective as the 3'5' AVP-binding peptide in blocking AVP function. No effect was seen with a 9-amino acid control peptide consisting of a 'scrambled' 3'5' AVP-binding peptide sequence. Further, polyclonal anti-rat 5'3' AVP-binding peptide antibodies blocked AVP activity, whereas polyclonal anti-bovine 5'3' AVP-binding peptide antibodies had no significant effect. Polyclonal antibodies g...Continue Reading

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