Abstract
1,2-dimethylhydrazine (DMH) is widely used to induce colorectal tumours in rodents. Some of the animals develop ear as well as colorectal tumours. Rats with large, ulcerated ear tumours are usually sacrificed before the completion of the experiment. In this experiment, fourty-six male Spraque-Dawley rats were injected with 1,2-dimethylhydrazine (21 mg/kg body weight) once a week for 27 weeks to study the histogenesis of colorectal carcinoma. Thirty-six developed ear tumours. Fourteen of the 36 tumours were larger than 2 cm in diameter. These developed between 20–26 weeks and were surgically excised 1–5 weeks later. Four rats died postoperatively. The surgical removal of large ear tumours permitted the completion of the large bowel experiment on schedule (i.e. 27 weeks) in 10 (28%) of the 36 rats with ear tumours.
Résumé
La 1,2 dimethylhydrazine (DMH) est largement utilisée pour induire des tumeurs colo-rectales chez les rongeurs. Quelques animaux développent des tumeurs de l'oreille au même titre que des tumeurs colo-rectales. Les rats porteurs de larges tumeurs exulcérées de l'oreille sont sacrifiés habituellement avant la fin de l'expérimentation. Dans cette étude, 46 rats mâles Spraque-Dawley ont reçu par injection de la 1,2 dimethylhydrazine (21 mg/kg de poids corporel) une fois par semaine durant 27 semaines afin d'étudier l'histo-génèse des cancers colo-rectaux. Trente-six ont développé des tumeurs de l'oreille, 14 de ces 36 tumeurs mesuraient plus de 2 cm de diamètre. Elles se développent entre la 20 et la 26e semaine et ont été excisées chirurgicalement 1 à 5 semaines plus tard. Quatre rats sont morts dans la période post-opératoire. L'excision chirurgicale des larges tumeurs de l'oreille a permis de compléter le programme d'expérimentation colique (sur 27 semaines) chez 10 (28%) des 36 rats porteurs des tumeurs de l'oreille.
Similar content being viewed by others
References
Druckrey H, Preussmann R, Matzkies F, Ivankovic S (1967) Selektive Erzeugung von Darmkrebs bei Ratten durch 1,2-dimethyl-hydrazin. Naturwissenschaften 54:285–286
LaMont TJ, O'Gorman TA (1978) Experimental colon cancer. Gastroenterology 75:1157–1169
Ward TM (1974) Morphogenesis of chemically induced neoplasma of the colon and small intestine in rats. Lab Invest 30:503–513
Vinas-Salas J. Fortuny JC, Panades J, Pinol C, Prim M, Ferminan A, Corbella G, Caldero J, Egido R (1992) Appearance of ear tumors in Sprague-Dawley rat treated with 1,2-dimethyl-hydrazine when used as a model for colonic carcinogenesis. Carcinogenesis 13:493–495
Rubio CA and Fu-Shen Liu (1990) The histogenesis of the microinvasive basal cell carcinoma of the oesophagus. Pathol Res Pract 186:223–227
Pozharisski KM (1990) Tumors of the intestines. In: Turusov VS, Mohr U (eds) Pathology of Tumors in Laboratory Animals, vol 1: tumours of the rat. International Agency for Research on Cancer, Lyon, pp 159–198
Shetye JD, Rubio CA, Harmenberg U, Ware J, Duvander A, Mellstedt H (1990) Tumor associated antigens common to humans and chemically induced colon tumors of the rat. Cancer Res 50:6358–6363
Hagihara PF, Yoneda K, Sachatello CR, Hedgecock H, Flesher JW, Ram MD, Griffen WO, Goldenberg DM (1980) Colonic tumorigenesis in rats with 1,2-dimethylhydrazine. Dis Col Rect 3:137–140
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Shetye, J., Mathiesen, T., Fagerberg, J. et al. Ear tumours induced by experimental carcinogenesis in the rat: excision prevents early death. Int J Colorect Dis 9, 125–127 (1994). https://doi.org/10.1007/BF00290187
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00290187