著者

Kentaro Nakanishi Keiichi Hiramoto Kazuya Ooi

出版者

The Pharmaceutical Society of Japan

雑誌

Biological and Pharmaceutical Bulletin (ISSN:09186158)

巻号頁・発行日

vol.44, no.6, pp.884-887, 2021-06-01 (Released:2021-06-01)

参考文献数

27

被引用文献数

6

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Several studies have been conducted to investigate the anti-cancer effects of vitamin C (VC). However, the effect of high-dose VC administration on tumor angiogenesis remains unclear. Focusing on our high-dose VC, our study investigated the effect of high-dose VC (4 g/kg) on vascular endothelial growth in mice with xenografts of a rectal cancer cell line referred to as Colon 26. Male mice harboring Colon 26 tumors were established, and high-dose VC solution was orally administered once daily for 14 d. On the final day of the study, the lower limb tumor tissues and serum samples were collected and analyzed for the expression of tumor angiogenesis related proteins as well as the levels of reactive oxygen species (ROS). Oral VC administration decreased tumor volumes and increased p53 and endostatin levels. In addition, plasma and in tumor part ROS levels and tissue hypoxia inducible factor-1α (HIF-1α) were reduced by VC administration. In addition, the levels of vascular endothelial growth factor A (VEGFA) and vascular endothelial growth factor D (VEGFD) were decreased by VC administration. These results suggest that VC exerts its anti-cancer effects by suppressing angiogenesis.

著者

Atsuo Fujito Keiichi Hiramoto Masashi Imai Shota Tanaka Kazuya Ooi

出版者

The Pharmaceutical Society of Japan

雑誌

Biological and Pharmaceutical Bulletin (ISSN:09186158)

巻号頁・発行日

pp.b23-00108, (Released:2023-05-17)

参考文献数

30

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Anticancer drugs exhibit many side effects, including skin pigmentation, which often lowers patient quality of life. However, the mechanism of pigmentation caused by anticancer drugs remains unknown. The purpose of this study was to elucidate the mechanism of anticancer drug-induced skin pigmentation using 5-fluorouracil (5-FU), a widely used anticancer drug. Specific pathogen-free, 9-week-old Hos:HRM-2 male mice were intraperitoneally administered 5-FU daily for 8 weeks. Skin pigmentation was observed at the end of the study. Mice treated with 5-FU were also administered inhibitors of cAMP, α-melanocyte-stimulating hormone (α-MSH), and adrenocorticotropic hormone (ACTH) for analysis. Administration of oxidative stress, nuclear factor-kappa B (NF-κB), cAMP, and ACTH inhibitors reduced pigmentation in 5-FU-treated mice. These results indicate that the oxidative stress/NF-κB/ACTH/cAMP/tyrosinase pathway plays an important role in pigmentation in 5-FU-treated mice.

著者

Kentaro Nakanishi Keiichi Hiramoto Eisuke F Sato Kazuya Ooi

出版者

The Pharmaceutical Society of Japan

雑誌

Biological and Pharmaceutical Bulletin (ISSN:09186158)

巻号頁・発行日

vol.44, no.1, pp.75-81, 2021-01-01 (Released:2021-01-01)

参考文献数

43

被引用文献数

4 7

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Several studies have been conducted to explore the anticancer effects of vitamin C (VC). However, the effect of high-dose VC administration on melanoma is still unknown. Therefore, in this study, we investigated the effects of high-dose VC (4 g/kg) on the invasion and proliferation of melanoma cells in various organs of mice. B16 melanoma cells (1 × 106 cells/100 µL) were intravenously injected into the tails of female mice, and VC solution (4 g/kg) was orally administered once a day for 14 d. On the 15th day, samples from the liver, lungs, jejunum, and ovaries were collected and analyzed for invasion and proliferation of melanoma cells. Oral VC administration decreased the number of dihydroxyphenylalanine (DOPA)-positive cells and gp100-positive melanoma cells in the ovaries and suppressed the invasion and proliferation of melanoma. Compared to melanoma-administered mice, macrophage inflammatory protein-2 levels and number of neutrophils were increased in the VC + melanoma-administered mice. Furthermore, the concentrations of VC, iron, and hydrogen peroxide, and the number of terminal deoxynucleotidyl transferase mediated deoxyuridine triphosphate nick end labeling (TUNEL)-positive cells were significantly increased in the ovaries of VC + melanoma-administered mice compared to those of melanoma-administered mice. These results suggest that VC can reduce the invasion and proliferation of melanoma cells in the ovaries, and neutrophils in the ovaries play an important role in achieving this melanoma-suppressive effect.

著者

Keiichi Hiramoto Tamami Homma Mika Jikumaru Hirohisa Miyashita Eisuke F. Sato Masayasu Inoue

出版者

SOCIETY FOR FREE RADICAL RESEARCH JAPAN

雑誌

Journal of Clinical Biochemistry and Nutrition (ISSN:09120009)

巻号頁・発行日

vol.43, no.2, pp.75-81, 2008 (Released:2008-08-30)

参考文献数

37

被引用文献数

3 6

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The immunological properties and hormonal metabolism in rodents are affected by physical and psychological stress more strongly in males than in females. To elucidate the mechanism and physiological significance of the sex difference in the susceptibility of animal to stresses, changes in the immunological system in plasma and intestine and hormonal status in plasma were compared among 8-week-old male and female ICR mice before and after fasting. During the fasting of animals, the expression of immunoglobulin A in intestinal mucosa, and cortisol, interleukin-10 and interferon-γ in plasma increased. These changes occurred more apparently in males than in females. Under identical conditions, the plasma levels of testosterone decreased markedly with concomitant occurrence of apoptosis in the testis, while the plasma levels of estradiol decreased calmly, and no appreciable apoptosis occurred in the ovary. These results indicate that testosterone enhances the stress-induced modulation of the immune system by some mechanism that was antagonized by estradiol.