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  • Title: Immunoreactive beta-endorphin in a subpopulation of mouse spleen macrophages.
    Author: Lolait SJ, Lim AT, Toh BH, Funder JW.
    Journal: J Clin Invest; 1984 Jan; 73(1):277-80. PubMed ID: 6317717.
    Abstract:
    Using radioimmunoassay and immunofluorescence with antibodies to beta-endorphin (beta EP) and ACTH, we have shown that a subpopulation of mouse spleen cells, expressing Mac-1, a marker of macrophage differentiation, contains immunoreactive (ir)-beta EP, ir-ACTH, and smaller amounts of presumptive higher molecular weight forms of both. Neither nonadherent spleen cells, nor adherent or nonadherent cells from peripheral blood, contained detectable levels of these peptides. These findings suggest that beta EP and ACTH may be synthesized in a subpopulation of spleen macrophages, and are consistent with the possibility that these or related peptides may modulate lymphocyte function in the specific microenvironment of the spleen.
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