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Geriatric muscle stem cells switch reversible quiescence into senescence (Set 3; Adult vs. Young)

ABSTRACT: Regeneration of skeletal muscle depends on a population of adult stem cells (satellite cells) that remain quiescent throughout life. Satellite cell regenerative functions decline with aging. We report that geriatric satellite cells, compared to old and adult cells, are incapable of maintaining their normal quiescent state in muscle homeostatic conditions, and this irreversibly affects their intrinsic regenerative and self-renewal capacities. We analyzed the global changes in gene expression occurring within muscle stem cells (satellite cells) in homeostatic conditions during physiological aging. Pure satellite cell populations from dissociated skeletal muscle from Young (2-3 months) and Adult (6 months) mice were isolated using a well-established flow cytometry protocol gating on integrin a7(+)/CD34(+) (positive selection) and Lin- (CD31, CD45, CD11b, Sca1) (negative selection).

ORGANISM(S): Mus musculus

SUBMITTER: Eusebio Perdiguero

PROVIDER: E-GEOD-53726 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Geriatric muscle stem cells switch reversible quiescence into senescence (Set 1; Geriatric vs. Young)

Project description:Regeneration of skeletal muscle depends on a population of adult stem cells (satellite cells) that remain quiescent throughout life. Satellite cell regenerative functions decline with aging. Here we report that geriatric satellite cells, compared to old cells, are incapable of maintaining their normal quiescent state in muscle homeostatic conditions, and this irreversibly affects their intrinsic regenerative and self-renewal capacities. We analyzed the global changes in gene expression occurring within muscle stem cells (satellite cells) in homeostatic conditions during physiological aging. Pure satellite cell populations from dissociated skeletal muscle from Young (2-3 months) and Geriatric (28-32 months) mice were isolated using a well-established flow cytometry protocol gating on integrin a7(+)/CD34(+) (positive selection) and Lin- (CD31, CD45, CD11b, Sca1) (negative selection).

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Geriatric muscle stem cells switch reversible quiescence into senescence (Set 2; Old/Geriatric vs. Young and SAMR1 vs. SAMP8)

Project description:Regeneration of skeletal muscle depends on a population of adult stem cells (satellite cells) that remain quiescent throughout life. Satellite cell regenerative functions decline with aging and in progeric conditions. Here we report that geriatric satellite cells, compared to old cells, are incapable of maintaining their normal quiescent state in muscle homeostatic conditions, and this irreversibly affects their intrinsic regenerative and self-renewal capacities. We analyzed the global changes in gene expression occurring within muscle stem cells (satellite cells) in homeostatic conditions during physiological aging and progeria. Pure satellite cell populations from dissociated skeletal muscle from Young (2-3 months), Old (22-24 months), Geriatric (28-30 months), SAMR1 and SAMP8 mice were isolated using a well-established flow cytometry protocol gating on integrin a7(+)/CD34(+) (positive selection) and Lin- (CD31, CD45, CD11b, Sca1) (negative selection).

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Geriatric muscle stem cells switch reversible quiescence into senescence (Set 4; Bmi1-deficient)

Project description:Regeneration of skeletal muscle depends on a population of adult stem cells (satellite cells) that remain quiescent throughout life. Satellite cell regenerative functions decline in geriatric satellite cells, compared to old cells are incapable of maintaining their normal quiescent state in muscle homeostatic conditions, and this irreversibly affects their intrinsic regenerative and self-renewal capacities. In geriatric mice, resting satellite cells lose reversible quiescence by switching to an irreversible pre-senescence state, caused by derepression of p16INK4a. Young Bmi1-deficient satellite cells shares similar features. We analyzed the global changes in gene expression occurring within muscle stem cells (satellite cells) in homeostatic conditions during physiological aging. Pure satellite cell populations from dissociated skeletal muscle from WT and Bmi1-deficient mice were isolated using a well-established flow cytometry protocol gating on integrin a7(+)/CD34(+) (positive selection) and Lin- (CD31, CD45, CD11b, Sca1) (negative selection).

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Geriatric muscle stem cells switch reversible quiescence into senescence (Set 3; Adult vs. Young)

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Geriatric muscle stem cells switch reversible quiescence into senescence (Set 1; Geriatric vs. Young)

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Geriatric muscle stem cells switch reversible quiescence into senescence

Project description:Regeneration of skeletal muscle depends on a population of adult stem cells (satellite cells) that remain quiescent throughout life. Satellite cell regenerative functions decline with aging and in progeric conditions. Here we show that geriatric satellite cells, compared to old cells, are incapable of maintaining their normal quiescent state in muscle homeostatic conditions, and this irreversibly affects their intrinsic regenerative and self-renewal capacities.

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P38 signaling underlies a cell-autonomous loss of stem cell self-renewal in aged muscle

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Epigenetic determinants of muscle stem cell quiescence and chronological aging (ChIP-seq)

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