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Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling of human aging hematopoietic progenitor/stem cells

ABSTRACT: To determine how aging impacts gene expression in hematopoietic stem cells (HSCs), human CD34+ cells from bone marrow (34BM) and mobilized stem cell products (34P38NPBSC) were examined using microarray-based expression profiling. Differential expression changes were confirmed by microarray comparisons of younger and older expanded T-cell populations. Experiment Overall Design: We compared gene expression profiles between younger and older human CD34+ cells from bone marrow (34BM) and CD34+CD38- cells from mobilized stem cell products(34P38NPBSC). We also examined gene expression changes associated with aging in human expanded T-cells. For 34BM and T-cells, biotin-labeling of total RNA (5 Âµg) was performed as per standard Affymetrix protocol. For the 34P38NPBSC arrays, the single-stranded linear amplification protocol was used to process total RNA (100 nanograms) for the microarrays. Both protocols are described in detail in PMID14706461.

ORGANISM(S): Homo sapiens

SUBMITTER: Derek Stirewalt

PROVIDER: E-GEOD-13496 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Decreased IRF8 expression found in aging hematopoietic progenitor/stem cells.

Stirewalt D L DL Choi Y E YE Sharpless N E NE Pogosova-Agadjanyan E L EL Cronk M R MR Yukawa M M Larson E B EB Wood B L BL Appelbaum F R FR Radich J P JP Heimfeld S S

Leukemia 20080703 2

PMID: 18596738

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Aging hematopoietic progenitor/stem cells

Project description:To determine how aging impacts gene expression in hematopoietic stem cells (HSCs), human CD34+ cells from bone marrow (34BM) and mobilized stem cell products (34P38NPBSC) were examined using microarray-based expression profiling. Differential expression changes were confirmed by microarray comparisons of younger and older expanded T-cell populations.

2008-12-01 | GSE13496 | GEO

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Normal Muscle - Female , Effect of Age

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Resistance Exercise Reverses Aging in Human Skeletal Muscle

Project description:Human aging is associated with skeletal muscle atrophy and functional impairment (sarcopenia). Multiple lines of evidence suggest that mitochondrial dysfunction is a major contributor to sarcopenia. We evaluated whether healthy aging was associated with a transcriptional profile reflecting mitochondrial impairment and whether resistance exercise could reverse this signature to that approximating a younger physiological age. Skeletal muscle biopsies from healthy older (N = 25) and younger (N = 26) adult men and women were compared using gene expression profiling, and a subset of these were related to measurements of muscle strength. 14 of the older adults had muscle samples taken before and after a six-month resistance exercise-training program. Before exercise training, older adults were 59% weaker than younger, but after six months of training in older adults, strength improved significantly (P<0.001) such that they were only 38% lower than young adults. As a consequence of age, we found 596 genes differentially expressed using a false discovery rate cut-off of 5%. Prior to the exercise training, the transcriptome profile showed a dramatic enrichment of genes associated with mitochondrial function with age. However, following exercise training the transcriptional signature of aging was markedly reversed back to that of younger levels for most genes that were affected by both age and exercise. We conclude that healthy older adults show evidence of mitochondrial impairment and muscle weakness, but that this can be partially reversed at the phenotypic level, and substantially reversed at the transcriptome level, following six months of resistance exercise training. Keywords: resistance exercise, muscle, aging

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