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  • American Physiological Society  (2)
  • Biology  (2)
  • 1
    Online Resource
    Online Resource
    Using molecular classification to predict gains in maximal aerobic capacity following endurance exercise training in humans
    American Physiological Society ; 2010
    In:  Journal of Applied Physiology Vol. 108, No. 6 ( 2010-06), p. 1487-1496
    Details
    In: Journal of Applied Physiology, American Physiological Society, Vol. 108, No. 6 ( 2010-06), p. 1487-1496
    Abstract: A low maximal oxygen consumption (V̇o 2max ) is a strong risk factor for premature mortality. Supervised endurance exercise training increases V̇o 2max with a very wide range of effectiveness in humans. Discovering the DNA variants that contribute to this heterogeneity typically requires substantial sample sizes. In the present study, we first use RNA expression profiling to produce a molecular classifier that predicts V̇o 2max training response. We then hypothesized that the classifier genes would harbor DNA variants that contributed to the heterogeneous V̇o 2max response. Two independent preintervention RNA expression data sets were generated ( n = 41 gene chips) from subjects that underwent supervised endurance training: one identified and the second blindly validated an RNA expression signature that predicted change in V̇o 2max (“predictor” genes). The HERITAGE Family Study ( n = 473) was used for genotyping. We discovered a 29-RNA signature that predicted V̇o 2max training response on a continuous scale; these genes contained ∼6 new single-nucleotide polymorphisms associated with gains in V̇o 2max in the HERITAGE Family Study. Three of four novel candidate genes from the HERITAGE Family Study were confirmed as RNA predictor genes (i.e., “reciprocal” RNA validation of a quantitative trait locus genotype), enhancing the performance of the 29-RNA-based predictor. Notably, RNA abundance for the predictor genes was unchanged by exercise training, supporting the idea that expression was preset by genetic variation. Regression analysis yielded a model where 11 single-nucleotide polymorphisms explained 23% of the variance in gains in V̇o 2max , corresponding to ∼50% of the estimated genetic variance for V̇o 2max . In conclusion, combining RNA profiling with single-gene DNA marker association analysis yields a strongly validated molecular predictor with meaningful explanatory power. V̇o 2max responses to endurance training can be predicted by measuring a ∼30-gene RNA expression signature in muscle prior to training. The general approach taken could accelerate the discovery of genetic biomarkers, sufficiently discrete for diagnostic purposes, for a range of physiological and pharmacological phenotypes in humans.
    Type of Medium: Online Resource
    ISSN: 8750-7587 , 1522-1601
    URL: Article
    DOI: 10.1152/japplphysiol.01295.2009
    RVK:
    WA 15000
    RVK:
    XA 52094
    Language: English
    Publisher: American Physiological Society
    Publication Date: 2010
    detail.hit.zdb_id: 1404365-8
    SSG: 12
    SSG: 31
    Location Call Number Limitation Availability
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Aquaporin-1 and endothelial nitric oxide synthase expression in capillary endothelia of human peritoneum
    American Physiological Society ; 1998
    In:  American Journal of Physiology-Heart and Circulatory Physiology Vol. 275, No. 1 ( 1998-07-01), p. H234-H242
    Details
    In: American Journal of Physiology-Heart and Circulatory Physiology, American Physiological Society, Vol. 275, No. 1 ( 1998-07-01), p. H234-H242
    Abstract: Water transport during peritoneal dialysis (PD) requires ultrasmall pores in the capillary endothelium of the peritoneum and is impaired in the case of peritoneal inflammation. The water channel aquaporin (AQP)-1 has been proposed to be the ultrasmall pore in animal models. To substantiate the role of AQP-1 in the human peritoneum, we investigated the expression of AQP-1, AQP-2, and endothelial nitric oxide synthase (eNOS) in 19 peritoneal samples from normal subjects ( n = 5), uremic patients treated by hemodialysis ( n = 7) or PD ( n = 4), and nonuremic patients ( n = 3), using Western blotting and immunostaining. AQP-1 is very specifically located in capillary and venule endothelium but not in small-size arteries. In contrast, eNOS is located in all types of endothelia. Immunoblot for AQP-1 in human peritoneum reveals a 28-kDa band (unglycosylated AQP-1) and diffuse bands of 35–50 kDa (glycosylated AQP-1). Although AQP-1 expression is remarkably stable in all samples whatever their origin, eNOS (135 kDa) is upregulated in the three patients with ascites and/or peritonitis (1 PD and 2 nonuremic patients). AQP-2, regulated by vasopressin, is not expressed at the protein level in human peritoneum. This study 1) supports AQP-1 as the molecular counterpart of the ultrasmall pore in the human peritoneum and 2) demonstrates that AQP-1 and eNOS are regulated independently of each other in clinical conditions characterized by peritoneal inflammation.
    Type of Medium: Online Resource
    ISSN: 0363-6135 , 1522-1539
    URL: Article
    DOI: 10.1152/ajpheart.1998.275.1.H234
    RVK:
    WA 15000
    Language: English
    Publisher: American Physiological Society
    Publication Date: 1998
    detail.hit.zdb_id: 1477308-9
    SSG: 12
    Location Call Number Limitation Availability
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