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• W2044859253 abstract "Ciliary movement is generated in the axoneme by the unidirectional sliding of the outer doublets of microtubules produced by the adenosine triphosphate (ATP)-energized dynein arms. It is composed of an effective stroke phase and a passive recovery stroke phase. Two parameters are modulated to determine swimming characteristics of the cell (speed and direction): beat frequency; direction of the effective stroke. They are linked to the internal Ca++ level and to the membrane potential. The membrane governs the internal Ca++ level by regulating Ca++ influx and efflux. It contains voltage-sensitive Ca++ channels through which a passive Ca++ influx, driven by the electrochemical gradient, occurs during step depolarization. The rise of the Ca++ level, up to 6.10-7M triggers ciliary reversal and enhances beat frequency. Ca+ is extruded from cilia by active transport. Ca++ also activates a multistep enzymatic process, the first component of which is a membrane calmodulin-dependent guanylate cyclase. cGMP interacts with Ca++ to modulate the parameters of the ciliary beat. The phosphorylation-dephosphorylation cycle of axoneme and membrane proteins seems to play a major role in controlling ciliary movement. Hyperpolarization of the membrane enhances beat frequency by an unknown mechanism. It could be a modification of the ratio of axonemal bound Ca++ and Mg++, or activation by cyclic adenosine monophosphate (cAMP) produced by a membrane adenylate cyclase. The ciliary membrane behaves as a receptor able to detect modifications of external parameters, and as a transductor transmitting the detected signal by a second or third messengers toward the interior of the cilia. These messengers. acting at different levels, modulate the parameters of the mechanism that generates ciliary movement." @default.
• W2044859253 created "2016-06-24" @default.
• W2044859253 creator A5052989764 @default.
• W2044859253 date "1988-01-01" @default.
• W2044859253 modified "2023-09-23" @default.
• W2044859253 title "Membrane control of ciliary movement in ciliates" @default.
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• W2044859253 doi "https://doi.org/10.1016/0248-4900(88)90052-4" @default.
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