Hormone Action and Sensitivity: Possible Relation to Aging
Hormones are organic chemicals produced by specialised cells in specific glands and transported to target cells, where they evoke a specific response. The target cells are characterized by the presence of receptors, which bind the hormone and, subsequently, initiate the response of the cell. This classical hormone concept is fading. Hormones are also produced by cells outside specialised glands and non-target tissue also contains receptors for hormones. Moreover, typical mammalian hormones and neurotransmitters have been isolated from protozoa and plants and have been shown to influence development processes in non-mammalian tissues (Roth et al., 1982) Conversely, typical plant hormones were found to be produced by mammalian cells and micro-organisms and to influence development processes in non-plant tissue (Amagai, 1984; Ebright and Beckwith, 1985; LePage-Degivry et al., 1986). Finally, peptide and lipid hormone-like substances have been isolated from plants (Watson and Waaland, 1986; Scherer et al., 1988).
KeywordsPolar Auxin Transport Plant Cell Tissue Organ Cult Release Free Fatty Acid Cytoplasmic Free Calcium Lily Bulb
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