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© Artur Scherf
Scanning Electron Microscopy of Red Blood Cell infected by Plasmodium falciparum.
Publication : The Journal of experimental medicine

Transmission blocking immunity in Plasmodium vivax malaria: antibodies raised against a peptide block parasite development in the mosquito vector

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The Journal of experimental medicine - 01 Jan 1995

Snewin VA, Premawansa S, Kapilananda GM, Ratnayaka L, Udagama PV, Mattei DM, Khouri E, Del Giudice G, Peiris JS, Mendis KN, David PH

Link to Pubmed [PMID] – 7807016

J. Exp. Med. 1995 Jan;181(1):357-62

One approach towards the development of a vaccine against malaria is to immunize against the parasite sexual stages that mediate transmission of the parasite from man to mosquito. Antibodies against these stages, ingested with the blood meal, inhibit the parasite development in the mosquito vector, constituting “transmission blocking immunity.” Most epitopes involved in transmission-blocking immunity depend on the tertiary conformational structure of surface antigens. However, one of the transmission-blocking monoclonal antibodies we have raised against Plasmodium vivax reacts with a linear epitope on both asexual stages and gametes. This monoclonal antibody (A12) is capable of totally blocking development of the parasite in the mosquito host when tested in membrane feeding assays with gametocytes from P. vivax-infected patients. Immune screening of a P. vivax lambda gt11 genomic expression library with A12 led to the isolation of a clone to which was mapped the six-amino acid epitope recognized by A12. Antisera raised in mice against a 12-mer synthetic peptide containing this epitope coupled to bovine serum albumin not only had high titers of antipeptide antibodies as measured by enzyme-linked immunosorbent assay, but in addition recognized the same 24- and 57-kD parasite components as A12 on Western blots and reacted with the parasite by immunofluorescence. When tested in membrane feeding assays, these antibodies have significant suppressive effects on parasite development in the mosquito.

http://www.ncbi.nlm.nih.gov/pubmed/7807016