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Biomedical subjects

T Hunt

Publications and source records attributed to T Hunt.

At least 163 records · Page 9Linked to original sources
PubMed1983

Isolation versus grouped housing in rats: differential effects of low doses of heroin in the place preference paradigm.

Male Long Evans rats were reared from weaning (21-23 days) either in isolation or in groups of four for 40 days. Animals were then individually introduced to a testing apparatus consisting of two distinct chambers. A modified place preference paradigm was used consisting of 3 phases: (1) An habituation phase (4 days) during which rats were allowed free access to the entire test apparatus for 15 min. periods daily; (2) A conditioning phase (4 days) during which rats were confined to their non-preferred side for 15 minutes each day immediately following subcutaneous injection of 0, 20, 40 and 80 micrograms/kg of heroin HCl; (3) A test phase (1 day) during which rats were again allowed free access to the testing chamber following injection of vehicle. The difference in time spent on the conditioned side during habituation and test periods was determined. The group-reared rats showed similar effects for all doses of heroin whereas the same magnitude of drug effect was attained only at the highest dose used in the isolated rats. This differential sensitivity to heroin in the place preference paradigm is discussed in terms of the modification of behavioral effects of opiates by environmental influences.

Animals↗
PubMed1983

Cyclin: a protein specified by maternal mRNA in sea urchin eggs that is destroyed at each cleavage division.

Cleavage in embryos of the sea urchin Arbacia punctulata consists of eight very rapid divisions that require continual protein synthesis to sustain them. This synthesis is programmed by stored maternal mRNAs, which code for three or four particularly abundant proteins whose synthesis is barely if at all detectable in the unfertilized egg. One of these proteins is destroyed every time the cells divide. Eggs of the sea urchin Lytechinus pictus and oocytes of the surf clam Spisula solidissima also contain proteins that only start to be made after fertilization and are destroyed at certain points in the cell division cycle. We propose to call these proteins the cyclins.

Alkaloids↗
PubMed1981

Heroin and morphine: aversive and analgesic effects in rats.

Although a number of studies demonstrate morphine-induced taste aversions, no such reports exist for heroin. In a conventional taste aversion paradigm, rats were injected with one of six heroin doses (0.5-12.0 mg/kg) after consuming a novel saccharin solution (Experiment 1). When the saccharin was reintroduced a second time no significant reduction in consumption occurred at any of the doses tested. It was therefore concluded that heroin does not readily induce a taste aversion. In Experiment 2, morphine was tested in an identical taste aversion paradigm and, as expected, a significant taste aversion did result at two of the doses tested. Experiment 3 demonstrated that heroin produced analgesia equal to or greater than morphine when comparing dosages of heroin which failed to induce a CTA with CTA-inducing morphine dosages. Thus, whereas heroin is more potent than morphine as an analgesic, heroin is less potent than morphine as a CTA-inducing agent.

Analgesics↗
PubMed1980

A simple method of labelling mouse Thy-1 antibodies with FITC.

Unlike antibodies produced in rabbits and other animals, mouse antibodies have proved to be difficult to covalently label with fluorochromes. By careful control of the labelling conditions, a method has been established for labelling mouse Thy-1 antibodies obtained by immunisation with normal thymus cells. The resultant FITC Thy-1 antibodies suffer little loss in cytotoxic properties, react with the correct specificity and can be used to label Thy-1 positive cells.

Animals↗