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The use of direct deposition electron microscope autoradiography in studies of protein transport
Author(s) -
Hemmings W. A.,
Williams E. W.
Publication year - 1976
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1976.tb02396.x
Subject(s) - cytoplasm , vacuole , electron microscope , microbiology and biotechnology , biology , yolk sac , cell , chemistry , embryo , biochemistry , physics , optics
SUMMARY The use of direct deposition autoradiography in studies of the localization of proteins labelled with radio‐iodine or tritium in the epithelia of fetal, suckling, and adult animals is described. Using a single marker in the first place, rabbit IgG and bovine IgG have been seen both in the vacuolar apparatus and also free in the cytoplasm of endodermal cells of the rabbit yolk‐sac splanchnopleur. This has been confirmed in those cells using a combination of bovine IgG marked with tritium and rabbit IgG marked with 125 I, presented simultaneously to the cells. Both proteins are present, apparently equally, attached to the brush border and distributed through the cytoplasm, as well as within vacuoles. Selection does not take place before or during entry to the cell, as has been suggested by quantitative results which have been reported elsewhere. It is hoped that the use of two markers together will permit localization of the selective process. In the adult rat gut, both isotopes have been demonstrated entering and within and leaving the ileal cell, confirming quantitative results reported elsewhere.