Abstract:
:Hypertension is considered as one of the cancer progressive factors, and often found comorbidity in cancer patients. Renin-angiotensin system (RAS) plays an important role in the regulation of blood pressure, and angiotensin II (Ang II) is well known pressor peptide associated with RAS. Ang II has been reported to accelerate progression and metastasis of cancer cells. However, its precise mechanisms have not been fully understood. In this study, we sought to elucidate the mechanisms by which Ang II exacerbates hematogenous metastasis in mouse melanoma cells, focusing the adhesion pathway in vascular endothelial cells. For this purpose, B16/F10 mouse melanoma cells, which do not express the Ang II type 1 receptor (AT1R), were intravenously injected into C57BL/6 mice. Two weeks after cell injection, the number of lung metastatic colonies was significantly higher in the Ang II-treated group (1 μg/kg/min) than in the vehicle-treated group. The AT1R blocker valsartan (40 mg/kg/day), but not the calcium channel blocker amlodipine (5 or 10 mg/kg/day), significantly suppressed the effect of Ang II. In endothelium-specific Agtr1a knockout mice, Ang II-mediated acceleration of lung metastases of melanoma cells was significantly diminished. Ang II treatment significantly increased E-selectin mRNA expression in vascular endothelial cells collected from lung tissues, and thus promoted adherence of melanoma cells to the vascular endothelium. Ang II-accelerated lung metastases of melanoma cells were also suppressed by treatment with anti-E-selectin antibody (20 mg/kg). Taken together, Ang II-treatment exacerbates hematogenous cancer metastasis by promoting E-selectin-mediated adhesion of cancer cells to vascular endothelial cells.
journal_name
Biochem Pharmacoljournal_title
Biochemical pharmacologyauthors
Ishikane S,Hosoda H,Nojiri T,Tokudome T,Mizutani T,Miura K,Akitake Y,Kimura T,Imamichi Y,Kawabe S,Toyohira Y,Yanagihara N,Takahashi-Yanaga F,Miyazato M,Miyamoto K,Kangawa Kdoi
10.1016/j.bcp.2018.04.012subject
Has Abstractpub_date
2018-08-01 00:00:00pages
136-147eissn
0006-2952issn
1873-2968pii
S0006-2952(18)30155-2journal_volume
154pub_type
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