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At least 883 records · Page 49Linked to original sources
PubMed1979

Effects of repeated Corynebacterium parvum and BCG therapy on immune parameters: a weekly sequential study of melanoma patients. I. Changes in non-specific (NK, K and T cell) lymphocytotoxicity, peripheral blood counts and delayed hypersensitivity reactions.

Increased lymphocyte cytotoxicity, particularly of 'killer' K cell type was recorded with repeated immunizations of either C. parvum or BCG. A 3 week interval between immunizations was capable of maintaining the increase in cytotoxicity. No marked alterations of 'recall' skin hypersensitivity reactions nor of peripheral blood counts were noted. Expression of cytotoxicity results as percentage 51Cr release, lytic units/ml and cytotoxic capacity (after logit transformation of the cytotoxicity-lymphocyte curves) are described. A 3 week immunization schedule is suggested where BCG and C. parvum are used as immunotherapeutic agents, in the doses quoted.

Adult↗
PubMed1987

The method of preparation of an antigen may influence the cellular reaction to it in skin tests for delayed hypersensitivity: comparison between responses to two different reagents prepared from Mycobacterium tuberculosis.

Antigen preparations extracted from Mycobacterium tuberculosis by different procedures--PPD and 'New tuberculin'--were compared with respect to the cytology of the Type IV reaction they elicit in the dermis. The numbers and microanatomical localization of cells of the major lymphocyte and monocyte subsets were measured histometrically in immunocytochemically-stained sections of biopsies of the 48 h reactions. Despite the close similarity in size of the external appearance of the reactions provoked by the two preparations, 'New tuberculin' elicited a more extensive perivascular infiltrate and more numerous diffusely infiltrating M3-bearing cells: the number of diffusely infiltrating CD4 and CD8 lymphocytes was similar in reactions against the two antigen preparations. Thus the method used to prepare a skin test reagent may affect the nature of the cellular reaction it provokes: differences in content of various classes of antigenic macromolecules are probably important, but the relative content of other irritant constituents may also be important.

Adolescent↗