title: Breeding severely vitamin B12-deficient mice as model animals.
abstract: Newborn mice weaned from mice fed on a B12-deficient diet during pregnancy and lactation were fed on a B12-deficient diet for 90 days after weaning, and the state of B12 deficiency was evaluated. The effect of B12 deficiency on the testicular tissue was also examined. The body weight of the mice fed on a B12-deficient diet for 90 days was slightly lower than that of the control mice administrated CN-B12, and the urinary excretion of methylmalonic acid (MMA) was increased. The B12 concentrations in the liver and testes were markedly depressed by B12 deficiency, being about 13 and 10 pmol/g, respectively, on day 90. The testes weight was clearly reduced by B12 deficiency. The testes weight/100 g body weight was also lowered. Clear morphological changes were observed in the testicular tissue of the B12-deficient mice. These results showed that mice in a severely B12-deficient state could be produced by dietary B12 deprivation. These B12-deficient mice could be useful as model animals not only for elucidating the functions of B12 in vivo, but also for biochemical studies.
authors.affiliation: Faculty of Education, Okayama University, Tsushimanaka, Okayama 700-0082, Japan. kawatat@cc.okayama-u.ac.jp
authors.forename: Tetsunori
authors.initials: T
authors.lastname: Kawata
authors.forename: Ulala
authors.initials: U
authors.lastname: Funada
authors.forename: Masahiro
authors.initials: M
authors.lastname: Wada
authors.forename: Masanao
authors.initials: M
authors.lastname: Matsushita
authors.forename: Tomoko
authors.initials: T
authors.lastname: Sanai
authors.forename: Hideaki
authors.initials: H
authors.lastname: Yamada
authors.forename: Masanori
authors.initials: M
authors.lastname: Kuwamori
authors.forename: Kumiko
authors.initials: K
authors.lastname: Arai
authors.forename: Yuji
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: Nobuo
authors.initials: N
authors.lastname: Tanaka
authors.forename: Tadahiro
authors.initials: T
authors.lastname: Tadokoro
authors.forename: Akio
authors.initials: A
authors.lastname: Maekawa
mesh_terms: D000818:Animals; D001835:Body Weight; D004032:Diet; D004195:Disease Models, Animal; D008099:Liver / Q000378:metabolism / Q000473:pathology; D008297:Male; D039382:Maternal Nutritional Physiological Phenomena / Q000502:physiology; D008764:Methylmalonic Acid / Q000652:urine; D051379:Mice; D008807:Mice, Inbred BALB C; D009929:Organ Size; D012720:Severity of Illness Index; D013737:Testis / Q000378:metabolism / Q000473:pathology; D013997:Time Factors; D014805:Vitamin B 12 / Q000378:metabolism; D014806:Vitamin B 12 Deficiency / Q000378:metabolism* / Q000473:pathology / Q000652:urine
chemical_list: D008764:Methylmalonic Acid; D014805:Vitamin B 12