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S Briscoe

Publications and source records attributed to S Briscoe.

7 recordsLinked to original sources
PubMed2003

Identification of an immuno-protective mucin-like protein, peritrophin-55, from the peritrophic matrix of Lucilia cuprina larvae.

A mucin-like glycoprotein, peritrophin-55 was isolated and purified from the peritrophic matrix of Lucilia cuprina larvae. When injected into sheep, peritrophin-55 induced an immune response that inhibited larval growth by 51-66% when larvae subsequently fed on sera from the vaccinated sheep. The protein may have potential use as an immunogen probably accompanying other antigens to protect sheep from the cutaneous myiasis caused by these larvae. Peritrophin-55 was uniformly distributed throughout the peritrophic matrix where it probably lubricates the surface of the peritrophic matrix and protects the midgut from invasion by bacteria. The protein consists of an 8-cysteine amino-terminal domain (peritrophin-B domain) and a carboxy-terminal proline and threonine-rich domain with high probability for extensive O-linked glycosylation. The gene consists of two exons separated by a small intron. Peritrophin-55 mRNA was only detected in the larval cardia and midgut and to a minor extent in the hindgut. Sequence upstream of the transcriptional start site contained a putative promoter region, sequence similar to an ecdysone response element, sequence related to the Drosophila transposon S element and a tetranucleotide repeat region. A putative Drosophila melanogaster ortholog or paralog of peritrophin-55 (CG7714) was located within a 3458 bp intron of the Cha gene (choline-O-acetyltransferase), but on the opposite strand. Comparison of the putative promoter regions of the peritrophin-55 and CG7714 genes revealed little similarity except for a small semi-conserved sequence that is suggestive of a common transcription factor-binding site possibly contributing to the highly restricted developmental and tissue-specific expression patterns of these genes.

Amino Acid Sequence↗
PubMed2002

Reduced oviposition of Boophilus microplus feeding on sheep vaccinated with vitellin.

The most abundant protein present in Boophilus microplus eggs, vitellin, was isolated and purified as a non-covalent complex of six glyco-polypeptides of Mr 44-107kDa. The protein complex bound haem. Immuno-blots demonstrated that antibodies raised to vitellin recognised a 200kDa polypeptide in the haemolymph of adult female ticks. This is consistent with the general proposal that in arthropods vitellin is derived by proteolytic processing from a large precursor protein, vitellogenin. In parallel with this study, an 80kDa glycoprotein (GP80) was independently purified from larvae of B. microplus using efficacy in vaccination trials as an assay. Antibodies to GP80 also recognised a 200kDa protein in the haemolymph of ticks and a major 87kDa polypeptide present in the vitellin complex. Conversely, antibodies to purified vitellin recognised GP80. The amino-terminal amino acid sequences of the 87kDa vitellin polypeptide and GP80 were identical for at least the first 11 residues and internal peptide sequences from both polypeptides were co-located in a single but incomplete deduced amino sequence of B. microplus vitellogenin. Thus, GP80 is a processed product from vitellogenin and highly related to but not completely identical with the 87kDa vitellin polypeptide. Vaccination trials in the model host sheep were performed with purified vitellin and GP80. Sheep vaccinated with either purified vitellin or GP80 returned significantly reduced numbers of engorged female ticks with decreased weights and reduced oviposition. In contrast, sheep vaccinated with recombinant hexahis-GP80, which was incorrectly folded and not glycosylated showed no significant effects on ticks. It was concluded that vitellin and GP80 could induce immune responses that partially protect sheep from the tick, B. microplus. However, critical protective epitopes are associated with the folding of the protein and/or the oligosaccharides attached to it.

Animals↗
PubMed2001

Posthypnotic amnesia for material learned before or during hypnosis: explicit and implicit memory effects.

This article focuses on dissociations between explicit and implicit expressions of memory during posthypnotic amnesia (PHA). Despite evidence of such dissociations, experimental design in this area has not always been consistent with contemporary memory research. Within a paradigm that aimed for conceptual and methodological clarity, we presented 40 high and 38 low hypnotizable individuals with a word list either before or during hypnosis, gave them a PHA suggestion for the word list, and tested them on explicit and implicit memory tasks. In the absence of conscious recollection, highs showed equivalent levels of priming (perceptual and semantic) to lows. However, when analysis focused only on those highs who remained amnesic after the implicit memory tasks, we confirmed perceptual, but not semantic, priming. These findings highlight the impact of methodological choices on theoretical interpretations of memory performance following a suggestion for PHA.

Adolescent↗
PubMed1983

Fractured femur.

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Aged↗