The Fc receptor of human monocytes and pulmonary macrophages has been evaluated quantitatively by binding of radiolabeled soluble IC. On both cell types, binding was mediated by saturable surface receptors specifically inhibited by aggregated human IgG, and IgG3. The affinity of the Fc receptor was similar on monocytes and pulmonary macrophages from nonsmokers, but macrophages demonstrated four to 13 times more surface receptors than circulating monocytes. No difference in Fc receptor binding of monocytes was observed between cigarette smokers and nonsmokers. However, pulmonary macrophages from smokers demonstrated a significantly lower Fc receptor affinity than did those of nonsmokers, although the number of Fc receptors was the same.
|Original language||English (US)|
|Number of pages||8|
|Journal||Journal of Laboratory and Clinical Medicine|
|State||Published - 1982|
ASJC Scopus subject areas
- Pathology and Forensic Medicine