Akamatsu M, Mashiba R, Kawakatsu K, Ishikawa M, Nishikata T. Comparison of Macrophage Activation Using γ-Globulin and Serum-derived Macrophage Activating Factor.
Anticancer Res 2020;
40:4707-4710. [PMID:
32727796 DOI:
10.21873/anticanres.14471]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Revised: 06/18/2020] [Accepted: 06/20/2020] [Indexed: 11/10/2022]
Abstract
BACKGROUND/AIM
Serum-derived macrophage activating factor (serum-MAF) can rapidly activate macrophage phagocytic activity by inducing characteristic membrane ruffles designated as Frill-like structures. Serum-MAF contains γ-globulin, an activator of phagocytosis. This study examined whether serum-MAF and γ-globulin activate macrophages similarly.
MATERIALS AND METHODS
Morphological changes in macrophages were observed by time-lapse imaging and the efficiency of engulfment was analysed quantitatively. Immunological staining of talin-1 and a calpain inhibitor were performed.
RESULTS
The engulfment efficiency of serum-MAF- and γ-globulin-activated macrophages was significantly different. Talin-1 showed weak co-localisation with the Frill-like structures. Treatment with a calpain inhibitor similarly down-regulated phagocytosis irrespective of the activation factor.
CONCLUSION
There was a difference between macrophage activation mechanisms by γ-globulin and serum-MAF. Talin may slightly contribute to serum-MAF activation. It is possible to distinguish between the calpain-dependent fundamental 'mechanism of phagocytosis' and the activating factor-dependent rapid 'activation mechanism'.
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