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Ultraviolet B (UVB) radiation is a major contributor to skin photoaging. Although mainly absorbed by the epidermis, UVB photons managing to penetrate the upper dermis affect human dermal fibroblasts (HDFs), leading, among others, to the accumulation of senescent cells. In vitro studies have shown that repeated exposures to subcytotoxic UVB radiation doses provoke HDFs' premature senescence shortly after the end of the treatment period. Here, we found that repetitive exposures to non-cytotoxic...

Studies using mitophagy reporter mice have established steady-state landscapes of mitochondrial destruction in mammalian tissues, sparking intense interest in basal mitophagy. Yet how basal mitophagy is modified by healthy aging in diverse brain cell types has remained a mystery. We present a comprehensive spatiotemporal analysis of mitophagy and macroautophagy dynamics in the aging mammalian brain, reporting critical region- and cell-specific turnover trajectories in a longitudinal study. We...

Aging is tightly associated with reduced immune protection but increased risk of autoimmunity and inflammatory conditions. Regulatory T cells are one of the key cells to maintaining immune homeostasis. The age-dependent changes in CD4^(+)Foxp3^(+) regulatory T cells (Tregs) have been well documented. However, the nonredundant Foxp3^(-)CD8^(+) Tregs were never examined in the context of aging. This study first established clear distinctions between phenotypically overlapping CD8^(+) Tregs and...

CONCLUSION: High impact pain and depression increase the risk of underestimating longevity. Future research should explore the impact on health and financial decisions in older adults.

Narrowing storm bands may be a surprising and dangerous new feedback of climate change

Science, Volume 386, Issue 6728, December 2024.

Science, Volume 386, Issue 6728, December 2024.

Science, Volume 386, Issue 6728, Page 1359-1361, December 2024.