Abstract
The aging of the skin is the most visible and obvious manifestation of organismal aging and may serve as a predictor of life expectancy and health. It is, however, also the human desire for long-lasting beauty that further raises interests in the topic, and thus considerable means and efforts are put into studying the mechanisms of skin aging in basic and applied research. Both medical und non-medical interests are of benefit for skin research in general because the results from these studies help to deepen our understanding of the complex molecular, biological, cell signaling, developmental and immunological processes in this organ. In fact, the skin is an ideal organ to observe and analyze the impact of extrinsic and intrinsic drivers of aging. Within the past five years technological advances like lineage tracing of cells in model organisms, intra-vital microscopy, nucleic acid sequencing at the single cell level, and high resolution mass spectrometry have allowed to study aging and senescence of individual skin cells within the tissue context, their signaling and communication, and to derive new hypotheses for experimental studies in vitro. In this short review we will discuss very recent developments that promise to extend the existing knowledge on cell aging and senescence of dermal fibroblasts and epidermal keratinocytes in skin aging.
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