Tumor-associated macrophage/microglia infiltration in human gliomas is correlated with MCP-3, but not MCP-1.
The monocyte chemotactic protein 3 (MCP-3) belongs to the MCP subgroup of the CC chemokines and promotes chemotaxis of immune cells. MCP-1 is believed to play an important role in monocyte infiltration into tumor tissues; however, the relationship between tumor-infiltrating macrophage/microglia (TIM/M) and the expression of chemokines has not been investigated in detail in human glioma samples; therefore, we first examined the expression of several chemokines and chemokine receptors in human tumor cell lines, which included glioma lines, using real-time PCR. We found that several glioma lines expressed MCP-3 predominantly, and not MCP-1. In order to assess the significance of MCP-3 expression in human glioma tissues, we then examined the number of CD68+ TIM/M, the percentage of TIM/M in the total cell population, and the expression of MCP-1 and MCP-3 in glioma tissues. There was a correlation between the percentage of TIM/M and MCP-3 expression levels; however, there was no correlation between the percentage of TIM/M and MCP-1 expression. There was no correlation between the number of TIM/M and prognosis of patients. These data indicate that tumor cell-derived MCP-3, but not MCP-1, facilitates the infiltration of macrophage/microglia into tumor tissues. This is the first study that clearly compared the significance of MCP-3 with that of MCP-1 in the tumor infiltration rates of TIM/M.
Okada
Makoto
M
Department of Neurosurgery, Gifu University Graduate School of Medicine, Gifu-city, Gifu 501-1194, Japan.
Saio
Masanao
M
Kito
Yusuke
Y
Ohe
Naoyuki
N
Yano
Hirohito
H
Yoshimura
Shinichi
S
Iwama
Toru
T
Takami
Tsuyoshi
T
D000293:Adolescent; D000328:Adult; D000368:Aged; D001932:Brain Neoplasms / Q000378:metabolism / Q000473:pathology; D018932:Chemokine CCL2 / Q000235:genetics / Q000378:metabolism*; D054410:Chemokine CCL7 / Q000235:genetics / Q000378:metabolism*; D002648:Child; D002675:Child, Preschool; D005260:Female; D005910:Glioma / Q000378:metabolism* / Q000473:pathology*; D006801:Humans; D007124:Immunoenzyme Techniques; D007223:Infant; D008264:Macrophages / Q000473:pathology*; D008297:Male; D017628:Microglia / Q000473:pathology*; D008875:Middle Aged; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014407:Tumor Cells, Cultured; D055815:Young Adult
C111835:CCL2 protein, human; D018932:Chemokine CCL2; D054410:Chemokine CCL7; D012333:RNA, Messenger