Patrick Paterson

Learn More
Normal mouse skin has a prominent fluorescence peak at 674 nm. Fluorescence emission and fluorescence excitation spectroscopy, carried out both in vitro and in vivo, led to the conclusion that the chromophore(s) responsible for this naturally occurring fluorescence is/are pheophorbide a and/or pheophytin a, degradation products of chlorophyll a that are(More)
Pretreatment of rats with phenobarbitone increased hepatic microsomal 7-methoxy-and 7-ethoxy-coumarin O-dealkylase activities. Pretreatment with beta-naphthoflavone increased only the 7-ethoxycoumarin O-dealkylase activity. The addition of metyrapone in vitro inhibited the O-dealkylations to different extents. Similar results were obtained with(More)
This study investigates the sex-dependence of the effects of microsomal enzyme inducers (phenobarbitone, isosafrole and ethanol) on the hepatic phase I metabolism of lignocaine and imipramine. It is shown that all of the inducers exert sex-dependent effects on the enzymes activities known to be sex related in the rat, e.g. lignocaine N-deethylase activity(More)
The rate of production of 4-hydroxybiphenyl from 4-methoxybiphenyl in hepatocytes isolated from untreated rats was essentially identical to that from biphenyl in hepatocytes isolated from rats pretreated with beta-naphthoflavone at 40 mg/kg. Similar results were obtained using liver microsomes isolated from untreated or treated rats. The selective(More)
Ascorbic acid at high non-physiological levels inhibited the sulphation of 4-hydroxybiphenyl by rat isolated hepatocytes. Glucuronylation of 4-hydroxybiphenyl, formed from 4-methoxybiphenyl, was increased at ascorbic acid levels which inhibited sulphation. The glucuronylation of 4-hydroxybiphenyl added directly to the cells was enhanced at concentrations of(More)
Salmonella typhimurium (TA98) mutagenesis assays were used to study the influence of the antioxidant butylated hydroxytoluene (BHT) on 2-acetylaminofluorene (2-AAF) mutagenesis, in search of the mechanism of the anticarcinogenic effects of BHT. Rats pre-treated with BHT in the diet (0.5% w/w for 10 days) provided hepatocytes and hepatocyte S9 which were(More)
The degradation of polybutylcyanoacrylate (PBC) and polyhexylcyanoacrylate (PHC) nanoparticles, together with their association with and toxicity towards isolated hepatocytes, were determined. Nanoparticles were not taken up by rat hepatocytes at a significant level. The LD50S of PBC and PHC nanoparticles towards hepatocytes were 0.4 mg/2 x 10(6) cells and(More)