In order to elucidate the specific function of eosinophil, the reaction of specific human eosinophilic granules to various immuno-complexes was investigated systematically by electron microscope. The eosinophils were incubated with immuno-complexes such as IgE, IgG, IgA, IgM, C3 and albumin at 37℃ for 1 hour. Characteristic changes were observed in IgE, IgG and C3 immuno-complex. Morphologically, coarsening of granular matrix, appearance of tubular structures and vacuolation, namely granule lysis, were characteristic. It may be considered that these morphological changes are relative to the release of granular content, which are packed in tubular structures. As content decreases, the tubular structures will appear and finally vacuolation will be performed. If the supposition that the reaction of eosinophil to IgE complex specifically is correct, it would be very convenient in elucidating the function of complex. It the receptor for IgE, IgG and C3 exist in eosinophil, the mechanism of this response is fully explained. However, further studies are indispensable because the existence of receptors for IgE unlike those for IgG and C3 are now in dispute.
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