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Potent Preventive Action of -Carotene against Carcinogenesis: Spontaneous Liver Carcinogenesis and Promoting Stage of Lung and Skin Carcinogenesis in Mice Are Suppressed More Effectively by -Carotene Than by β-Carotene¹

Junichi Okuzumi

Hidetoshi Okabe

Hirokazu Kitano and Ryozo Iwasaki

Department of Biochemistry [M. M., H. N., Y. S., J. T., T. H., H. T., A. I.] and First Department of Surgery [J. O.], Kyoto Prefectural University of Medicine, Kawaramachi-dori, Kamigyo-ku, Kyoto 602; Department of Laboratory Medicine, Siga University Medical School, Seta, Ohtsu, Siga 502-21 [H. O.]; and Research and Development Headquarters, Lion Corporation, 7-13-12 Hirai, Edogawa-ku, Tokyo 132 [H. K., R. I.], Japan

Although β-carotene has been considered to be a key cancer preventive agent in green and yellow vegetables, other types of carotenoids, such as -carotene, may also contribute to anticarcinogenic action, since these carotenoids usually coexist with β-carotene and are detectable in human blood and tissues. In this study, we compared the inhibitory effect of natural -carotene, obtained from palm oil, with that of β-carotene on spontaneous liver carcinogenesis in C3H/He male mice. The mean number of hepatomas per mouse was significantly decreased by -carotene supplementation (per os administration in drinking water at a concentration of 0.05%, ad libitum) as compared with that in the control group (P < 0.001, Student's t test). On the other hand, β-carotene, at the same dose as -carotene, did not show any such significant difference from the control group. Furthermore, we also compared the antitumor-promoting activity of -carotene with that of β-carotene against two-stage mouse lung carcinogenesis (initiator, 4-nitroquinoline 1-oxide; promoter, glycerol). -Carotene, but not β-carotene, reduced the number of lung tumors per mouse to about 30% of that in the control group (P < 0.001, Student's t test). The higher potency of the antitumor-promoting action of -carotene compared to β-carotene was confirmed in other experimental systems; e.g., -carotene was also found to have a stronger effect than β-carotene in suppressing the promoting activity of 12-O-tetradecanoylphorbol-13-acetate on skin carcinogenesis in 7,12-dimethylbenz[a]anthracene-initiated mice.

These results suggest that not only β-carotene, but also other types of carotenoids, such as a-carotene, may play an important role in cancer prevention.

¹ Supported in part by grants from the Ministry of Education, Science, and Culture; the Smoking Research Foundation; and the Plant Science Research Foundation, Faculty of Agriculture, Kyoto University, Japan.

² Present address: Oleochemistry Research Center, Lion Corporation, 7-13-12 Hirai, Edogawa-ku, Tokyo 132, Japan. To whom requests for reprints should be addressed.

The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

Received 11/25/91. Accepted 9/23/92.

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