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Studies of the Toxicological Potential of Tripeptides (L-Valyl-L-prolyl-L-proline and L-Isoleucyl-L-prolyl-L-proline): IX. Evaluation of the Mutagenic Potential of Synthesized L-Valyl-L-prolyl-L-proline in the Salmonella–Escherichia coli/Microsome, Incorporation Assay

SRA International, Inc., Washington DC, USA

Yasunori Nakamura
Kotaro Aihara

Product Development Laboratory, Calpis Co., Ltd., Sagamihara, Kanagawa, Japan

John H. Mennear

Campbell University, School of Pharmacy, Buies Creek, North Carolina, USA

Correspondence: Address correspondence to Bruce Bernard, PhD, SRA International, Inc., 1920 L Street, NW, Suite 420, Washington, DC 20036, USA. E-mail:bernard{at}sra-intl.com

The objective of this study was to assess the mutagenic potential of a synthesized tripeptide, L-valyl-L-prolyl-L-proline (VPP), to induce mutational changes in Salmonella typhimurium LT2 strains TA1535, TA1537, TA98, and TA100, and Escherichia coli strain WP2uvrA in the classical Ames test protocol. Bacteria were exposed to plate concentrations of VPP of 0, 156.2, 312.5, 625, 1250, 2500, and 5,000 µ g/plate in distilled water, in the presence and absence of Aroclor 1254–induced rat liver homogenate preparation (S9). Positive-control agents included sodium azide (TA100 and TA1535); 2-aminoanthracene (TA98, TA100, TA1535, TA1537, and WP2uvrA); 9-aminoacridine (TA1537); 2-nitrofluorene (TA98); and N-ethyl-N'-nitro-N-nitrosoguanidine (WP2uvrA) in DMSO. Incubations were conducted at 37°C for about 48 h then revertant colonies were counted. All positive-control agents were consistently and unequivocally positive, but there was no evidence that VPP induced increases in the incidences of revertant colonies in any bacterial strain with and without metabolic activation. These findings were replicated in a second, confirmatory test performed with and without S9. The results of the experiments revealed no treatment-associated changes in the incidence of revertant colonies in any bacterial strain tested. These results support a conclusion that, under the experimental conditions described, there is no evidence that VPP possesses mutagenic potential.

Key Words: Ames Test • Casein Hydrolysate • E. coli • IPP • Lactobacillus helveticus • Fermented Milk • Mutagenicity Testing • Salmonella typhimurium • Tripeptides • VPP

International Journal of Toxicology, Vol. 24, No. 4 Suppl, 107-113 (2005)
DOI: 10.1080/10915810500259689


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