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Extracellular purine nucleosides stimulate cell division and morphogenesis: pathological and physiological
M P Rathbone1, L Christjanson, S Deforge
1Department of Biomedical Sciences, McMaster University Health Science Centre, Hamilton, Ontario, Canada.
Medical Hypotheses
|April 1, 1992
Summary
Extracellular purines act as intercellular signals released by damaged cells. They synergize with growth factors to promote tissue repair, particularly in the central nervous system.
Area of Science:
- Cellular Biology
- Neuroscience
- Biochemistry
Background:
- Extracellular purine nucleosides and nucleotides serve as ancient intercellular signals.
- These purines are released from cells under stress, such as hypoxia or damage.
- They function as potent mitogens and inducers of cell differentiation.
Purpose of the Study:
- To propose a hypothesis on the synergistic role of extracellular purines with growth factors in tissue repair.
- To elucidate the involvement of purines in the central nervous system wound healing response.
- To highlight the pharmacological potential of targeting purinergic signaling.
Main Methods:
- Literature review and hypothesis formulation.
- Analysis of purinergic signaling pathways.
- Integration of existing knowledge on growth factor interactions.
Main Results:
- Extracellular purines act synergistically with growth factors, including nerve growth factor.
- They stimulate proliferation and morphological changes in fibroblasts, endothelial cells, and neuroglia.
- In the central nervous system, this leads to glial proliferation, capillary endothelial cell proliferation, and axonal sprouting.
Conclusions:
- Extracellular purines are key signaling molecules in tissue injury and repair.
- Their synergistic action with growth factors is crucial for wound healing, especially in the CNS.
- Targeting cell surface purine receptors offers significant pharmacological opportunities.