[Contractile proteins in chemical signal transduction in plant microspores].
Involvement of contractile components in chemical signal transduction from the cell surface to the organelles was studied using unicellular systems. Neurotransmitters dopamine and serotonin as well as active forms of oxygen hydrogen peroxide and tert-butyl peroxide were used as chemical signals. Experiments were carried out on vegetative microspores of field horsetail Equisetum arvense and generative microspores (pollen) of amaryllis Hippeastrum hybridum treated with cytochalasin B (an inhibitor of actin polymerization in microfilaments), colchicine, and vinblastine (inhibitors of tubulin polymerization in microtubules). Both types of thus treated microspores demonstrated suppressed development, particularly, for cytochalasin B treatment. At the same time, an increased typical blue fluorescence of certain cell regions (along the cell wall and around nuclei and chloroplasts) where the corresponding contractile proteins could reside was observed. In contrast to anticontractile agents, dopamine, serotonin B, and the peroxides stimulated microspore germination. Microspore pretreatment with cytochalasin B and colchicine followed by the treatment with serotonin, dopamine, or the peroxides decreased the germination rate. Involvement of actin and tubulin in chemical signal transduction from the cell surface to the nucleus is proposed.
Roshchina
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D000199:Actins / Q000032:analysis / Q000378:metabolism*; D000818:Animals; D003078:Colchicine / Q000494:pharmacology; D003285:Contractile Proteins / Q000032:analysis / Q000378:metabolism; D003572:Cytochalasins / Q000494:pharmacology; D004298:Dopamine / Q000494:pharmacology; D020829:Equisetum / Q000166:cytology / Q000469:parasitology; D006861:Hydrogen Peroxide / Q000494:pharmacology; D019668:Liliaceae / Q000166:cytology / Q000469:parasitology; D008870:Microtubules / Q000187:drug effects / Q000378:metabolism; D011058:Pollen / Q000737:chemistry / Q000187:drug effects / Q000378:metabolism*; D012701:Serotonin / Q000494:pharmacology; D015398:Signal Transduction; D014404:Tubulin / Q000032:analysis / Q000378:metabolism*
D000199:Actins; D003285:Contractile Proteins; D003572:Cytochalasins; D014404:Tubulin; D012701:Serotonin; D006861:Hydrogen Peroxide; D003078:Colchicine; D004298:Dopamine