Immunization with f-Met peptides induces immune reactivity against Mycobacterium tuberculosis.
OBJECTIVE
To determine whether synthetic peptides containing an amino terminal formyl-methionine residue and corresponding to the sequence of several proteins produced by Mycobacterium tuberculosis, would elicit an immune response in mice.


METHODS
Peptides corresponding to the amino termini of 8 M. tuberculosis proteins and initiating with formyl methionine residues were synthesized. The ability of these peptides to bind to the mouse non-classical MHC class I molecule H-2M3a was determined by flow microfluorimetry. These peptides were used to pulse dendritic cells that were then injected into normal mice. These mice were subsequently challenged with aerosolized M. tuberculosis and, 30 days later, the number of viable bacteria in the lungs was determined.


RESULTS
Four of the 8 synthetic peptides bound to H-2M3a and stabilized its expression on the cell surface. Injection of mice with dendritic cells pulsed with H-2M3a binding peptides elicited non-MHC restricted cytotoxic T lymphocytes that killed peptide pulsed target cells and macrophages infected with M. tuberculosis. Immunization of mice with syngeneic dendritic cells pulsed in vitro with 2 of these peptides led to retardation of the growth of M. tuberculosis following aerosol challenge.


CONCLUSIONS
Peptides that bind to non-polymorphic class I molecules can elicit immune reactivity directed towards M. tuberculosis.
Dow
S W
SW
Department of Medicine, National Jewish Centre for Immunology and Respiratory Medicine, Denver, CO, USA.
Roberts
A
A
Vyas
J
J
Rodgers
J
J
Rich
R R
RR
Orme
I
I
Potter
T A
TA
D000818:Animals; D001428:Bacterial Vaccines / Q000276:immunology*; D001667:Binding, Competitive / Q000276:immunology; D015169:Colony Count, Microbial; D003713:Dendritic Cells / Q000276:immunology; D005434:Flow Cytometry; D015395:Histocompatibility Antigens Class I / Q000276:immunology; D007111:Immunity, Cellular; D007114:Immunization; D051379:Mice; D008810:Mice, Inbred C57BL; D009169:Mycobacterium tuberculosis / Q000276:immunology* / Q000302:isolation & purification; D009239:N-Formylmethionine / Q000276:immunology*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology; D014614:Vaccines, Synthetic / Q000276:immunology*
D001428:Bacterial Vaccines; D015395:Histocompatibility Antigens Class I; D014614:Vaccines, Synthetic; D009239:N-Formylmethionine