An obligatory anaerobic Salmonella typhimurium strain redirects M2 macrophages to the M1 phenotype.

Abstract:

:A genetically engineered Salmonella typhimurium strain that may be applied in the medically useful therapeutic strategy of using bacterial agents to target breast cancer in a tumor-bearing nude mouse model has been previously reported. Furthermore, immune cell accumulation in breast tumor types has been observed, particularly distributed in regions surrounding the bacteria. M2 macrophages are associated with breast cancer aggressiveness, whereas M1 macrophages are prone to devouring bacteria and killing cancer cells. Therefore, this engineered tumor-targeting salmonella strain was used in an attempt to reverse the phenotype of M2 macrophages into the M1 phenotype. Subsequent to the co-culture of M2 macrophages with the bacteria for a short time, >50% of the M2 macrophages were invaded by bacteria. These M2 macrophages exhibited a decreased expression of mannose receptor (an M2 phenotypic marker) and increased expression of human leukocyte antigen-antigen D related (an M1 phenotypic marker). The results of the present study indicated that differentiated M2 macrophages may be redirected into the M1 phenotype following exposure to the engineered bacteria stimulus. This effect may be a potential mechanism by which bacteria retard tumor growth. Thus, this engineered bacterium may be a useful candidate for targeting and redirecting M2 macrophages into the M1 phenotype.

journal_name

Oncol Lett

journal_title

Oncology letters

authors

Yang M,Xu J,Wang Q,Zhang AQ,Wang K

doi

10.3892/ol.2018.7742

subject

Has Abstract

pub_date

2018-03-01 00:00:00

pages

3918-3922

issue

3

eissn

1792-1074

issn

1792-1082

pii

OL-0-0-7742

journal_volume

15

pub_type

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