A radioisotopic method to measure delayed type hypersensitivity in the mouse. I. Studies in sensitized and normal mice
Abstract
Delayed type hypersensitivity (DTH) lesions have been difficult to evaluate objectively in the mouse because they are usually assessed in terms of an increase in footpad swelling or ear thickness. We have developed a radioisotopic method which not only reduces the observer's error but also gives an objective measurement of the cellular activity in the lesions. In brief, 10 mul of the test antigen is injected intradermally into the left pinna and either nothing or the same volume of a control solution into the right. 10 h later, a 2-muCi pulse of 5-iodo-2'deoxyuridine-125I is given intravenously, the ears cut off at the hairline 16 h later and the radioactivity counted in a gamma spectrometer. The following was obtained as evidence that the increased radioactivity of the left pinna over the right was a measure of the extent of a DTH response: (1) the ear reaction was delayed in mice without serum antibodies becoming maximum at 24 h; (2) there was a mononuclear cell infiltration in the left pinna and autoradiographs revealed radioactive label bound to these cells; (3) athymic mice could not develop a 24-hour ear reaction, and (4) antigens known not to activate T cells did not elicit the ear response. Cell transfer studies will be...Continue Reading
Citations
Ly and Ia antigen phenotypes of T cells involved in delayed-type hypersensitivity and in suppression
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