Abstract:
AIM:Secondary necrotic cells generated in vivo induce inflammatory responses; for example, the production of macrophage inflammatory protein-2 (MIP-2) and subsequent infiltration of neutrophils. The aim of the present study was to elucidate the effect of aging on the phagocytosis of secondary necrotic cells and the inflammatory responses by using either wild-type (WT) young mice, WT aged mice or senescence-accelerated mice (SMP30(-/-) mice). METHODS:The phagocytosis of secondary necrotic neutrophils with resident macrophage from either WT young mice, WT aged mice or SMP30(-/-) mice was examined by coculturing macrophages with secondary necrotic neutrophils in vitro. To investigate the inflammatory response induced by secondary necrotic cells, time-dependent infiltration of neutrophils and production of MIP-2 were determined in the peritoneal cavity on the injection of secondary necrotic cells. RESULTS:The phagocytosis of secondary necrotic cells by macrophages from WT aged and SMP30(-/-) mice was significantly reduced as compared with that by macrophages from WT young mice. On peritoneal injection of secondary necrotic cells, the peak time of neutrophil infiltration was earlier in SMP30(-/-) mice than in WT young mice. The number of neutrophils in SMP30(-/-) mice at the peak time was also greater than that in WT young mice. CONCLUSIONS:Our findings showed that the phagocytosis of secondary necrotic cells was attenuated in aged mice and SMP30(-/-) mice, and that the MIP-2 production was enhanced and subsequently neutrophil infiltration was exaggerated on peritoneal injection of secondary necrotic cells into those mice.
journal_name
Geriatr Gerontol Intjournal_title
Geriatrics & gerontology internationalauthors
Takahashi R,Totsuka S,Ishigami A,Kobayashi Y,Nagata Kdoi
10.1111/ggi.12436subject
Has Abstractpub_date
2016-01-01 00:00:00pages
135-42issue
1eissn
1444-1586issn
1447-0594journal_volume
16pub_type
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