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Pekka Katajisto's Group

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Tissue Stem Cells and Aging

Our body is constantly renewed by tissue specific stem cells, which produce cells undertaking specialized functions and new stem cells maintaining the future renewal capacity. In a young body, such stem cells can easily counter the wear and tear of everyday life by replacing damaged cells with new ones. However, as we age, capacity of stem cells declines, and the resulting drop in tissue repair manifests as the functional decline associated with aging. Our goal is to understand why stem cell activity deteriorates with age, and to develop stem cell based strategies targeting aging related diseases and ailments.

Isolated intestinal crypts and villi. The intestinal stem cells are visible in green. The intestinal stem cells and their niche are one of the models used in our lab.

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  1. Asymmetric segregation of organelles during stem cell division
  2. Cellular metabolism and cell fate
  3. Impact of the stem cell niche on aging


Isolated oligodendrocyte progenitor cells (top left) are used to study asymmetric cell divisions and cellular metabolism. Isolated intestinal stem cells and their niche form organoids in vitro (top right), providing a functional assay for niche interactions. Decellularized extracellular matrix can be co-cultured with isolated cells to analyze cell-type specific ECM interactions (bottom left). Organoids can also be cultured in artificial scaffolds (bottom left). This allow us to test different biomaterials or different niche architectures effect stemness.

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Pekka Katajisto's Group

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