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. 1982 Sep;13(3):198–204. doi: 10.1007/BF00205389

The immunopathological effects of intracolonic injection of Mycobacterium bovis BCG cell wall emulsions in guinea pigs

G L Cockerell 1,✉, R W O'Donnell 1, M M Zgola 1
PMCID: PMC11039085  PMID: 6925985

Abstract

The immunological and pathological responses of guinea pigs to an intramural colonic injection of emulsions containing cell wall (CW) extracts of Mycobacterium bovis BCG and mineral oil were studied from week 1 to week 36 post-inoculation. The emulsions contained variable concentrations of BCG CW attached to (lipid-phase), or separate from (aqueous-phase), the mineral oil. Delayed cutaneous hypersensitivity to PPD was present throughout the course of the study in a variable percentage of guinea pigs inoculated with either type of emulsion. PPD-induced blast transformation of peripheral blood lymphocytes, studied in guinea pigs which received lipid-phase emulsion, was also detectable throughout the course of the study, with maximal response seen 2 weeks post-inoculation. The intracolonic inoculations were well tolerated, with the exception of the most concentrated lipid-phase emulsion (3 mg/ml BCG CW and 5% oil), after which one of eight guinea pigs died due to a colonic impaction and rupture at the site of inoculation. The pathological response to either type of emulsion was a focal granulomatous colitis, which tended to be more severe as the concentration of BCG CW and oil increased. Extracolonic lesions were usually limited to a granulomatous lymphadenitis of lymph nodes draining the injection site; however, the most concentrated lipid-phase emulsion occasionally produced granulomatous inflammatory foci in the liver and lungs. In general, the lesions induced by the lipid-phase emulsions were more severe than those induced by aqueous-phase emulsions, but the intensity of both types of lesions peaked at 2 or 4 weeks post-inoculation. It was concluded that the guinea pig may serve as a useful model to study BCG immunotherapy of colonic neoplasms, since intracolonic injection of BCG CW resulted in systemic immunity toward mycobacterial antigens and a localized accumulation of macrophages without untoward complications.

Keywords: Pathological Response, Lymphadenitis, Mycobacterium Bovis, Mycobacterial Antigen, Blast Transformation

Footnotes

The abbreviations used in this paper are: BCG CW, bacillus Calmette-Guérin cell walls; PPD, purified protein derivative; PBL, peripheral blood lymphocytes; cpm, counts per minute; SI, stimulation index; DCH, delayed cutaneous hypersensitivity

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