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Träfflista för sökning "WFRF:(Mancini A.) srt2:(2005-2009)"

Search: WFRF:(Mancini A.) > (2005-2009)

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  • Mancini, M. C., et al. (author)
  • Effect of gastric bypass on spontaneous growth hormone and ghrelin release profiles
  • 2006
  • In: Obesity (Silver Spring). ; 14:3, s. 383-7
  • Journal article (peer-reviewed)abstract
    • OBJECTIVE: The purpose of this study was to analyze growth hormone (GH) concentrations in obese women before and after Roux-en-Y gastric bypass (RYGBP) and how resulting changes in weight, fat mass, ghrelin levels, and insulin sensitivity affect GH secretion. RESEARCH METHODS AND PROCEDURES: Blood was sampled at 20-minute intervals for 24 hours in 10 non-diabetic premenopausal severely obese women before and 6 months after RYGBP. GH concentrations were measured in all samples, and serum ghrelin was collected at five time-points. RESULTS: After a 27% BMI drop (55.9 +/- 6.2 to 40.7 +/- 5.8 kg/m(2)), blunted GH profiles underwent partial recovery. Basal, postprandial, and mean ghrelin concentrations were not changed. A negative correlation was found between mean GH levels and insulin and homeostasis model assessment (p < 0.01). BMI accounted for 54% of GH variation. DISCUSSION: Partial recovery of GH secretion after RYGBP-induced weight loss suggests that a blunted secretion is not a causal factor of obesity but a consequence of the obese state and does not seem to be ghrelin-level dependent.
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  • Broeske, Ann-Marie, et al. (author)
  • DNA methylation protects hematopoietic stem cell multipotency from myeloerythroid restriction
  • 2009
  • In: Nature Genetics. - : Springer Science and Business Media LLC. - 1546-1718 .- 1061-4036. ; 41:11, s. 69-1207
  • Journal article (peer-reviewed)abstract
    • DNA methylation is a dynamic epigenetic mark that undergoes extensive changes during differentiation of self-renewing stem cells. However, whether these changes are the cause or consequence of stem cell fate remains unknown. Here, we show that alternative functional programs of hematopoietic stem cells (HSCs) are governed by gradual differences in methylation levels. Constitutive methylation is essential for HSC self-renewal but dispensable for homing, cell cycle control and suppression of apoptosis. Notably, HSCs from mice with reduced DNA methyltransferase 1 activity cannot suppress key myeloerythroid regulators and thus can differentiate into myeloerythroid, but not lymphoid, progeny. A similar methylation dosage effect controls stem cell function in leukemia. These data identify DNA methylation as an essential epigenetic mechanism to protect stem cells from premature activation of predominant differentiation programs and suggest that methylation dynamics determine stem cell functions in tissue homeostasis and cancer.
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  • Result 1-6 of 6

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