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A 28-day feeding study with methyl isoeugenol in rats
R Purchase1, G P Ford, D M Creasy
1BIBRA Toxicology International, Carshalton, Surrey, UK.
Abstract:
Methyl isoeugenol was administered in rodent diet for a minimum of 28 consecutive days to groups of 16 male and 16 female rats (Sprague-Dawley strain) at levels of approximately 30, 100 and 300 mg/kg body weight/day. A further group of 16 male and 16 female rats was given the rodent diet as a control. The administration of methyl isoeugenol in the diet did not adversely affect the growth or general health of the animals or their food intakes. Although high dose animals of both sexes had increased lymphocyte and total white blood cell counts, these are not considered, in isolation, to be an adverse effect of treatment. None of the minor variations observed in the serum chemical analyses or urine analyses is considered to be indicative of a treatment-related toxic effect. An increase in liver weight, adjusted for body weight, was seen in male and female rats receiving 300 mg methyl isoeugenol/kg body weight. Few histopathological abnormalities were observed. Although the incidence of kidney and Harderian gland lesions was higher for high dose animals compared with the controls, the lesions are of a type that occurs spontaneously and are thus not considered to be attributable to treatment with methyl isoeugenol. While the increased liver weight and white blood cell counts of rats given 300 mg methyl isoeugenol/kg body weight may represent effects of treatment, it is not considered that there is any reason to regard these as adverse effects.
Insights
Methyl isoeugenol administration in rodent diets showed no adverse effects on general health or growth. Minor increases in liver weight and white blood cell counts were observed but not considered toxicological concerns.
Area of Science:
- Toxicology
- Pharmacology
- Rodent Studies
Background:
- Methyl isoeugenol is a naturally occurring compound found in various essential oils.
- Understanding the toxicological profile of methyl isoeugenol is crucial for safety assessments.
Purpose of the Study:
- To evaluate the potential adverse effects of dietary methyl isoeugenol administration in Sprague-Dawley rats.
- To determine the no-observed-adverse-effect level (NOAEL) of methyl isoeugenol.
Main Methods:
- Rats (16 males, 16 females per group) were administered methyl isoeugenol in their diet at doses of 30, 100, or 300 mg/kg body weight/day for at least 28 days.
- Control groups received the standard rodent diet.
- Body weight, general health, food intake, hematology, serum chemistry, urinalysis, and histopathology were assessed.
Main Results:
- No adverse effects on growth, general health, or food intake were observed across all dose groups.
- Slight increases in liver weight and white blood cell counts (lymphocytes, total white blood cells) were noted in the high-dose (300 mg/kg) group.
- Minor variations in serum chemistry and urine analyses were not considered treatment-related.
- Histopathological examination revealed no significant treatment-related abnormalities, with observed kidney and Harderian gland lesions deemed spontaneous.
Conclusions:
- Dietary administration of methyl isoeugenol up to 300 mg/kg body weight/day did not induce significant adverse toxicological effects in rats.
- The observed increases in liver weight and white blood cell counts at the highest dose are not considered adverse effects.
- Methyl isoeugenol appears to have a favorable safety profile based on this 28-day rodent study.