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Ninomiya K, Kawaguchi H, Souda M, Taguchi S, Funato M, Umekita Y, Yoshida H. Effects of Neonatally Administered Diethylstilbestrol on Induction of Mammary Carcinomas Induced by 7, 12-Dimethylbenz[A]Anthracene in Female Rats. Toxicol Pathol 2016; 35:813-8. [DOI: 10.1080/01926230701584205] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Various doses of diethylstilbestrol (DES) were administered to rats once at birth. Thereafter, at 50 days after birth, the rats in all groups were given 10 mg 7, 12-dimethylbenz[a]anthracene (DMBA) and undergone necropsy at 300 days after birth. The incidence of mammary carcinomas (MCs) were 50, 54, 91, 39, 19% at 175 days after birth, and 77, 87, 100, 85, 75% at necropsy in the 0, 0.1, 1, 10, 100 μg groups, respectively. The incidence of rats without corpus luteum were 0, 0, 0, 30, 100% at 50 days after birth, and 0, 40, 53, 93, 100% at necropsy in the 0, 0.1, 1, 10, 100 μg groups, respectively. Observation of the whole mount specimens showed a higher number of terminal end buds (TEBs) in the 1 μg group and a lower number in the 100 μg group compared with the control at 50 days after birth. It suggested that the administration of a relatively low dose (1 μg) of DES during neonatal period may increase TEBs, thus resulting in a stimulatory effect on the initiation of MCs.
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Affiliation(s)
- Kenjiro Ninomiya
- Department of Tumor Pathology, Field of Oncology, Kagoshima University, Graduate School of Medical and Dental Sciences, Kagoshima, 890-8544 Japan
| | - Hiroaki Kawaguchi
- Department of Tumor Pathology, Field of Oncology, Kagoshima University, Graduate School of Medical and Dental Sciences, Kagoshima, 890-8544 Japan
| | - Masakazu Souda
- Department of Tumor Pathology, Field of Oncology, Kagoshima University, Graduate School of Medical and Dental Sciences, Kagoshima, 890-8544 Japan
| | - Shuuhei Taguchi
- Department of Tumor Pathology, Field of Oncology, Kagoshima University, Graduate School of Medical and Dental Sciences, Kagoshima, 890-8544 Japan
| | - Mamoru Funato
- Department of Tumor Pathology, Field of Oncology, Kagoshima University, Graduate School of Medical and Dental Sciences, Kagoshima, 890-8544 Japan
- Drug Safety Research Laboratories, Shin Nippon Biochemical Laboratories, Ltd., Kagoshima 891-1394 Japan
| | - Yoshihisa Umekita
- Department of Tumor Pathology, Field of Oncology, Kagoshima University, Graduate School of Medical and Dental Sciences, Kagoshima, 890-8544 Japan
| | - Hiroki Yoshida
- Department of Tumor Pathology, Field of Oncology, Kagoshima University, Graduate School of Medical and Dental Sciences, Kagoshima, 890-8544 Japan
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Omachi K, Kawaguchi H, Funato M, Sato K, Okasaki K, Nagaoka T, Abe S, Yoshida H. Effects of Various Doses of 17.BETA.-estradiol on the Progression of Mammary Carcinomas Induced by Single and Multiple Administration of 7,12-Dimethylbenz[a]anthracene in Female Rats. J Toxicol Pathol 2000. [DOI: 10.1293/tox.13.67] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- Katsumi Omachi
- The Department of Pathology I, Faculty of Medicine, Kagoshima University 8-35-1 Sakuragaoka, Kagoshima 890-8520 Japan
- Yoshitomi Pharmaceutical Industries, Ltd. 214-1, Yamasaki, Fukusaki, Kanzaki, Hyogo 679-2296 Japan
| | - Hiroaki Kawaguchi
- The Department of Pathology I, Faculty of Medicine, Kagoshima University 8-35-1 Sakuragaoka, Kagoshima 890-8520 Japan
| | - Mamoru Funato
- The Department of Pathology I, Faculty of Medicine, Kagoshima University 8-35-1 Sakuragaoka, Kagoshima 890-8520 Japan
- Shin Nippon Biomedical Laboratories, Ltd. 2438 Miyanoura, Yoshida, Kagoshima 891-1394 Japan
| | - Kenichi Sato
- Shin Nippon Biomedical Laboratories, Ltd. 2438 Miyanoura, Yoshida, Kagoshima 891-1394 Japan
| | - Keikou Okasaki
- Shin Nippon Biomedical Laboratories, Ltd. 2438 Miyanoura, Yoshida, Kagoshima 891-1394 Japan
| | - Takaharu Nagaoka
- Yoshitomi Pharmaceutical Industries, Ltd. 214-1, Yamasaki, Fukusaki, Kanzaki, Hyogo 679-2296 Japan
| | - Syunichi Abe
- Yoshitomi Pharmaceutical Industries, Ltd. 214-1, Yamasaki, Fukusaki, Kanzaki, Hyogo 679-2296 Japan
| | - Hiroki Yoshida
- The Department of Pathology I, Faculty of Medicine, Kagoshima University 8-35-1 Sakuragaoka, Kagoshima 890-8520 Japan
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Kawaguchi H, Sato K, Omachi K, Funato M, Nagata R, Yoshida H. Effects of High Doses of 17.BETA.-estradiol and Ovariectomy on 7,12-Dimethylbenz[a]anthracene-Induced Mammary Carcinomas and Dysplasias in Neonatally Androgenized Female Sprague-Dawley Rats. J Toxicol Pathol 2000. [DOI: 10.1293/tox.13.77] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- Hiroaki Kawaguchi
- The Department of Pathology I, Faculty of Medicine, Kagoshima University 8-35-1 Sakuragaoka, Kagoshima 890-8520 Japan
| | - Kenichi Sato
- The Department of Pathology I, Faculty of Medicine, Kagoshima University 8-35-1 Sakuragaoka, Kagoshima 890-8520 Japan
| | - Katsumi Omachi
- The Department of Pathology I, Faculty of Medicine, Kagoshima University 8-35-1 Sakuragaoka, Kagoshima 890-8520 Japan
| | - Mamoru Funato
- The Department of Pathology I, Faculty of Medicine, Kagoshima University 8-35-1 Sakuragaoka, Kagoshima 890-8520 Japan
| | - Ryoichi Nagata
- Shin Nippon Biomedical Laboratories, Ltd. 2438 Miyanoura, Yoshida, Kagoshima 891-1394 Japan
| | - Hiroki Yoshida
- The Department of Pathology I, Faculty of Medicine, Kagoshima University 8-35-1 Sakuragaoka, Kagoshima 890-8520 Japan
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