Search PubMed⌕ Search

Biomedical subjects

M Harboe

Publications and source records attributed to M Harboe.

At least 217 records · Page 12Linked to original sources
PubMed1969

Individual antigenic specificity of human macroglobulins: Localization of antigenic determinants and their use to demonstrate formation of hybrid molecules after reduction and reassociation.

The localization of individually specific antigenic determinants on the monoclonal gammaM Mö was studied in gel diffusion experiments with 19S gammaM Mö and its 7S subunit. Various types of such determinants were delineated. Some were demonstrable both on the intact macroglobulin molecule and on the subunit. The latter was often unable to precipitate with the corresponding antibody, but combined with it and inhibited precipitation. Immunization of rabbits with purified gammaMs Mö was the most useful way to obtain antisera demonstrating individually specific antigenic determinants on the subunit by direct precipitation. Still other determinants were apparently destroyed by mild reduction of the gammaM molecule. Reduction and reassociation of mixtures of two monoclonal gammaM-globulins resulted in formation of hybrid molecules containing subunits of different origin. Individually specific antisera against the two components were useful for demonstrating hybrid formation. Serological activity, i.e., cold agglutinin activity, was present in the hybrid molecules.

Alkylation↗
PubMedDate not supplied

Persistence of DNA from Mycobacterium tuberculosis in superficially normal lung tissue during latent infection.

BACKGROUND: A third of the world's population has latent infection with Mycobacterium tuberculosis, and in areas of low endemicity, most cases of active tuberculosis arise as a result of reactivation of latent bacilli. We sought to establish the cellular location of these latent organisms to facilitate their elimination. METHODS: We applied in-situ PCR to sections of macroscopically normal lung tissue from 13 individuals from Ethiopia and 34 from Mexico who had died from causes other than tuberculosis. Sections of lung tissue from six Norwegian individuals (ie, individuals from a non-endemic population) acted as negative controls, and six Ethiopian tuberculosis cases acted as positive controls. FINDINGS: Control necropsy samples from the Norwegian individuals were all negative by in-situ PCR and conventional PCR, whereas all samples from known Ethiopian tuberculosis cases were positive by both methods. However, in macroscopically normal lung tissue from Ethiopian and Mexican individuals without tuberculous lesions, the in-situ PCR revealed five of 13 and ten of 34 positive individuals, respectively. These results were confirmed by conventional PCR with extracted DNA. Positive cells included alveolar and interstitial macrophages, type II pneumocytes, endothelial cells, and fibroblasts. INTERPRETATION: M. tuberculosis can persist intracellularly in lung tissue without histological evidence of tuberculous lesions. M. tuberculosis DNA is situated not only in macrophages but also in other non-professional phagocytic cells. These findings contradict the dominant view that latent organisms exist in old classic tuberculous lesions, and have important implications for strategies aimed at the elimination of latent and persistent bacilli.

Adolescent↗