The results of assays for gene mutation in vitro were almost entirely
negative. Of 20 identified assays in Salmonella, results were negative in 18 (Green & Savage, 1978; Purchase et al., 1978; Baker & Bonin, 1981; Brooks & Dean, 1981; Garner et al., 1981; Gatehouse, 1981; Ichinotsubo et al., 1981; MacDonald, 1981; Martire et al., 1981; Nagao & Takahashi, 1981; Richold & Jones, 1981; Rowland
& Severn, 1981; Simmon & Shepherd, 1981; Skopek et al., 1981; Venitt & Crofton-Sleigh, 1981; Antoine et al., 1983; Falck et al., 1985; Mortelmans et al., 1986), and two had equivocal results (Hubbard et al., 1981; Trueman, 1981). Results in six assays in Escherichia coli were all negative (Gatehouse, 1981; Matsushima et al., 1981; Mohn et al., 1981; Thomson, 1981; Venitt & Crofton- Sleigh, 1981; Falck et al., 1985).
Although fewer assays for cytogenetic effects and genotoxicity
in
vitro were identified than for gene mutation, results were also predominantly
negative. In assays for chromosomal aberrations (CAs), results were negative
for human lymphocytes (Antoine et al., 1983) and Chinese hamster ovary (CHO) (Natarajan & van Kesteren-van
Leeuwen, 1981) and weakly positive in human peripheral lymphocytes (Koudela
& Spazier, 1979). In three mouse lymphoma assays, results were negative
(Jotz & Mitchell, 1981; Mitchell et al., 1988; Myhr & Caspary, 1988) and one was weakly positive (McGregor et al., 1988). Results of in vitro tests for sister chromatid exchange (SCE) were negative in three assays
in CHO (Evans & Mitchell, 1981; Natarajan & van Kesteren-van Leeuwen,
1981; Perry & Thomson, 1981) and one in human lymphocytes (Antoine
et al., 1983). Assays for unscheduled DNA synthesis (UDS) were negative in human
fibroblasts (Agrelo & Amos, 1981; Robinson & Mitchell, 1981), mouse
hepatocytes (Klaunig et al., 1984), and HeLa cells (Martin & McDermid, 1981), while in assays in
rat hepatocytes, results were both negative (Ito, 1982) and positive (Williams,
1977). Results of assays for DNA repair in mouse (McQueen et al., 1983) and hamster (McQueen et al., 1983) hepatocytes were also negative. An assay for DNA repair in human
hepatocytes had negative results (McQueen et al., 1988).
The database for genotoxicity studies in vivo is more limited than
that for in vitro studies.
In two adequate assays for micronucleus induc tion, results
were negative (Kirkhart, 1981; Antoine et al., 1983). In the latter study, dose levels were too widely spaced, and the
top dose was 2000 mg/kg body weight. Results were also negative in two
assays in which there were no positive controls (Salamone et al., 1981; Tsuchimoto & Matter, 1981). It should be noted that Salamone et al. (1981) observed no effect at doses up to 80% of the LD50. An assay in which an increase in micronuclei was observed in bone marrow
of mice was reported only as an abstract (Ye, 1987), although a dose-response
was not clear. Although six dose levels were included in the protocol,
the highest dose was only 20 mg/kg body weight (oral LD50 values in Labouratory animals range from 2000 to 7000 mg/kg body weight).
Negative results were reported in assays for chro mosomal
damage in bone marrow of rats (Sheveleva et al., 1979; McGregor, 1981) and dominant lethal assays in rats (Lewis et al., 1979; McGregor, 1981; Cragin et al., 1990). Limited reporting (abstracts, secondary sources) precluded critical
review of these studies.
Quantitative data were not presented in a report of an assay
in which SCEs were not observed in bone marrow of mice (Paika et al., 1981)
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