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Fifty two-week oral toxicity study of mofezolac (N-22), a new developed analgesic and anti-inflammatory agent, was carried out in Wistar rats with dose levels of 5, 20, 60 and 120 mg/kg/day, and the 5-week withdrawal was followed for recovery study. Hematuria, blanching of the skin and suppression of body weight gain were observed in females given 120 mg/kg, and 9 of these prostrated and died from week 20 to week 52, or were euthanized when moribund. These symptoms were not seen in males at any dose levels. In 120 mg/kg group, increased positive cases of fecal occult blood were observed during the administration period, and the pathological examination revealed gastrointestinal lesions such as erosion, ulcer, hemorrhage and mucosal regeneration in the small intestine. Renal disorder was also involved mainly in females given 120 mg/kg, as shown by increase in urine volume with declined osmotic pressure and specific gravity, serum urea nitrogen, creatinine, inorganic phosphorus, and other related parameters. In addition to enlargement, rough surface and scar formation, dilated tubular lumen and papillary ducts of the kidney were observed as a main lesion. Incidental findings with those disorders, observed mainly in females given 120 mg/kg, included increase in leucocytes with high neutrophils ratio, and enlargement of the spleen, adrenals and mesenteric lymph node. There were some of the similar gastrointestinal and renal changes mainly in females given 60 mg/kg. Anemic findings were noted in both sexes of 120 mg/kg and in females of 60 mg/kg group, and mainly females given 120 mg/kg showed increase in platelets, reticulocytes and fibrinogen, shortening of blood coagulation time, as well as extramedullary or accented hematopoiesis of the liver, spleen and bone marrow. Other serum biochemical changes observed mainly in females given 120 mg/kg were decrease or decreasing trend in total protein, A/G ratio, and transaminase activity. Fine structure of the liver from females given 20 mg/kg or more revealed cisternal dilatation of smooth-surfaced endoplasmic reticulum of hepatocytes, and the increased liver weight was observed in females given 120 mg/kg. Accordingly, non-effective dose level of N-22 in 52-week chronic toxicity study was estimated to be 20 mg/kg for males and 5 mg/kg for females.

FIFTY TWO-WEEK CHRONIC ORAL TOXICITY STUDY OF MOFEZOLAC (N-22) IN RATS