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Sökning: L773:1476 5578 > (1997-1999)

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  • Lindblad, K, et al. (författare)
  • Two commonly expanded CAG/CTG repeat loci : involvement in affectivedisorders?
  • 1998
  • Ingår i: Molecular Psychiatry. - 1359-4184 .- 1476-5578. ; 3:5, s. 405-410
  • Tidskriftsartikel (refereegranskat)abstract
    • An association between bipolar affective disorder and CAG/CTG trinucleotide repeat expansions (TRE) has previously been detected using the repeat expansion detection (RED) method. Here we report that 89% of RED products (CAG/CTG repeats) > 120 nt (n = 202) detected in affective disorder patients as well as unaffected family members and controls correlate with expansions at two repeat loci, ERDA1 on chromosome 17q21.3 and CTG18.1 on 18q21.1. In a set of patients and controls in which we had previously found a significant difference in RED size distribution, the frequency of expansions at the CTG18.1 locus was 13% in bipolar patients (n = 60) and 5% in controls (n = 114) (P < 0.07) with a significantly different size distribution (P < 0.03). A second set of patients were ascertained from 14 affective disorder families showing anticipation. Twelve of the families had members with RED products > 120 nt. The RED product distribution was significantly different (P < 0.0007) between affected (n = 53) and unaffected (n = 123) offspring. Using PCR, a higher frequency (P < 0.04) of CTG18.1 expansions as well as a different (P < 0.02) repeat size distribution was seen between affected and unaffected offspring. In addition, a negative correlation between RED product size and the age-of-onset could be seen in affected offspring (rs = -0.3, P = 0.05, n = 43). This effect was due to an earlier onset in individuals with long CTG18.1 expansions. No difference in ERDA1 expansion frequency was seen either between bipolar patients (35%, n = 60) and matched controls (29%, n = 114), or between affected and unaffected offspring in the families. We conclude that expanded alleles at the CTG18.1 locus confers an odds ratio of 2.6-2.8 and may thus act as a vulnerability factor for affective disorder, while the ERDA1 locus seems unrelated to disease.
  • Tingsborg, S, et al. (författare)
  • Regulation of ICE activity and ICE isoforms by LPS.
  • 1997
  • Ingår i: Molecular Psychiatry. - 1359-4184 .- 1476-5578. ; 2:2, s. 122-4
  • Tidskriftsartikel (refereegranskat)abstract
    • Interleukin 1 beta (IL-1 beta) is a highly inducible proinflammatory cytokine. It is processed to its mature, secreted 17-kDa form by a cysteine endoprotease; the interleukin 1 beta converting enzyme (ICE). Regulation of IL-1 beta levels can be achieved both at transcriptional and translational level and in particular at the posttranslational, ICE catalysed, level. Thus, we examined ICE activity in rats under conditions of systemic stimulation by intraperitoneal (i.p.) injections of lipopolysaccharide (LPS) from E. coli, which are known to dramatically alter IL-1 beta mRNA and protein levels. ICE mRNA levels and endoprotease activity have also been found to be differentially regulated in the rat adrenal gland and rat brain after i.p. injections of LPS. An induction in ICE mRNA levels could be seen in the adrenal gland, the pituitary and in the hypothalamus after LPS treatment as measured by reverse transcription-polymerase chain reaction (RT-PCR), whereas the ICE endoprotease activity was increased in the pituitary and decreased in the hippocampus and in the adrenal gland. The discrepancy between increased mRNA level for ICE and decreased enzyme activity in the adrenals might be explained by the induction of ICE isoforms, some of which might be inhibitory for the enzyme activity and induced by LPS, yielding as a net effect a suppression of ICE activity.
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