Comparative Aspects of Mechanoreceptor Systems by B. Martinac, A. H. Delcour, M. Buechner, J. Adler, C. Kung

By B. Martinac, A. H. Delcour, M. Buechner, J. Adler, C. Kung (auth.), Professor Fumio Ito (eds.)

In the prior five years there was a major elevate of facts that the ion channels activated via mechanical strength are universal to a wide selection of telephone forms. Mechanosensitive (MS) ion channels shape a small percentage of the complete channel inhabitants. they're now present in greater than 30 cellphone kinds from E. coli, yeast, to plant, invertebrate, and vertebrate cells, the place they take place in nearly every kind of cells from bone to soft muscle, in addition to neurons. nearly all of MS channels are permeable to monovalent cations and are just a little selective for okay+ over Na +. How­ 2 ever, there are a number of experiences of anion-selective MS channels, MS Ca + channels, and MS channels with huge conductances that don't dis­ criminate markedly among cations and anions. lately B. Hille has postulated attainable evolutionary relationships among various kinds of ion channels, with mechanosensitive channels predating even the eukaryotes. voltage-gated channel varieties originate with the stem eukaryotes, as deduced from the presence of voltage-gated ok+ 2 and Ca + channels in protozoa, algae, or larger crops. Agonist-gated chan­ nels in addition to voltage-gated Na + channels seem with the earliest metazoan animals, as deduced from the presence of Na + spikes and quick chemical synapses in cnidaria (coelenterates), ctenophores, and all better animals.

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Additional resources for Comparative Aspects of Mechanoreceptor Systems

Example text

3 Mechanisms of Adaptation of Mechanosensitive Channels . . . . . . . . 4 Physiological Function of Mechanosensitive Channels in Walled Organisms . . . 1 Membrane Stretching in Plants and Fungi . . . . . . . . . . . . . 2 Mechanosensitivity of Plants and Fungi . . . . . . . . . . . . . . 3 MS Channels as Mechanotransducers . . . . . . . . . . . . . . 5 Summary . . . . . . . . . . . . . . . . . . . . . . References .

Gustin Schroeder 11 (1988) K+ transport properties of K+ channels in the plasma membrane of Vicia laba guard cells. J Gen Physiol 92:667-683 Sheetz MP, Turney S, Qian H, Elson EL (1989) Nanometre-Ievel analysis demonstrates that lipid flow does not drive membrane glycoprotein movements. Nature (Lond) 340:284-288 Sievers A, Schnepf E (1981) Morphogenesis and polarity of tubular cells with tip growth. In: Kiermayer 0 (ed) Cytomorphogenesis in plants. Springer, Berlin Heidelberg New York, pp263-299 Sigurdson WJ, Morris CE, Brezden BL, Gardner DR (1987) Stretch activation of a K+ channel in molluscan heart cells.

Gustin Schroeder 11 (1988) K+ transport properties of K+ channels in the plasma membrane of Vicia laba guard cells. J Gen Physiol 92:667-683 Sheetz MP, Turney S, Qian H, Elson EL (1989) Nanometre-Ievel analysis demonstrates that lipid flow does not drive membrane glycoprotein movements. Nature (Lond) 340:284-288 Sievers A, Schnepf E (1981) Morphogenesis and polarity of tubular cells with tip growth. In: Kiermayer 0 (ed) Cytomorphogenesis in plants. Springer, Berlin Heidelberg New York, pp263-299 Sigurdson WJ, Morris CE, Brezden BL, Gardner DR (1987) Stretch activation of a K+ channel in molluscan heart cells.

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