Synergistic Activation of DNA Synthesis in Astrocytes by Fibroblast Growth Factors and Extracellular ATP |
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| Authors: | J T Neary S R Whittemore Q Zhu M D Norenberg |
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| Institution: | Laboratory of Neuropathology, VA Medical Center, Departments of Pathology, Biochemistry and Molecular Biology, and; Neurological Surgery, and The Miami Project, University of Miami School of Medicine, Miami, Florida, U.S.A. |
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| Abstract: | Abstract: The effects of extracellular ATP and polypeptide growth factors on DNA synthesis in primary cultures of rat astrocytes have been examined. It was found that ATP acts synergistically with either acidic or basic fibroblast growth factor to stimulate DNA synthesis. The specificity of this effect was demonstrated by the inability of ATP to potentiate DNA synthesis induced by platelet-derived growth factor or epidermal growth factor. ATP appears to act via P2 purinergic receptors, because (a) it was more effective than adenosine and (b) the synergistic effect was observed with the hydrolysis-resistant P2 agonists, ADPβS and ATPγS. The evidence suggests that extracellular ATP may be an important factor in regulating the extent of gliosis and, as such, may be involved in mechanisms of neural injury and repair. |
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| Keywords: | Astrocytes Extracellular ATP Growth factors DNA synthesis Purinergic receptors Gliosis |
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