Abstract
This paper describes a method for simultaneous measurement of the accumulation of plasma protein and erythrocytes in skin reactions of hypersensitivity to bovine γ-globulin (BGG) and tuberculin PPD in the guinea-pig. The procedure consists in giving 125I-labelled plasma albumin and 51Cr-labelled autologous erythrocytes together by intravenous injection into guinea-pigs bearing skin lesions of allergic inflammation at different times and for different periods during the development of the skin reactions. Isotope accumulation in excised skin reactions is measured by scintillation counting at different stages during the evolution of hypersensitivity responses.
Skin reactions of combined anaphylactic and Arthus hypersensitivity to BGG were characterized by pronounced increased vascular permeability principally in the first hour. In established 24-hour hypersensitivity reactions to both antigens (BGG and PPD) there was continuing accumulation of both plasma albumin and erythrocytes. During the development of the tuberculin reaction, an intermediate phase of isotope accumulation occurred between 6 and 9 hours after skin testing; serum transfer studies showed that this intermediate peak was not attributable to circulating antibody alone. These isotope tracer techniques were also applied to study vascular permeability in systemically transferred reactions of delayed hypersensitivity and in the vascular response to the intradermal injection of an inflammatory factor generated by antigen-activation of sensitized lymphocytes.
It was concluded that isotope tracing provided objective and sensitive methods for analysing microvascular responses in allergic inflammation.
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Selected References
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