The changes of the muscle fibres volume and resting membrane potential (RMP) were studied following treatment with hypertonic medium and furosemide. The volume changes in hypertonic medium began with cell shrinkage and later have been followed by the volume increase up to normal level during 30-40 minutes. At the same time the medium hypertonicity caused… (More)
Tetrodotoxin resistant sodium channels have been shown to operate in frog muscle membrane, which are responsible for local action potentials. These channels are located mainly in synaptic regions, and their distribution on the membrane is controlled by neurotrophic factors.
The volume change of the muscle fibres in the hypertonic medium begins with cell shrinkage. Later the cell volume increases up to the normal level because of the furosemide-sensitive CL(-)-influx activation. The property of the Cl(-)-influx to be activated in the hypertonic medium is abolished after denervation. That causes a loss of the ability of muscle… (More)
L-glutamate released from the motor nerve terminal seems to be involved in the maintenance of resting potential (RP) in skeletal muscles via the N-methyl-D-aspartate (NMDA)-activated influx of Ca2+ to the cytoplasm with subsequent activation of NO-synthase and production of the NO which could act as a messenger providing the control of the membrane… (More)
After experimental cease of neurotrophic control of skeletal muscle by denervation no changes in myosin ATP-ase histochemistry and immunohistochemical profile in slow (m. soleus) muscle of guinea pig were found. All muscle fibers in intact muscle fibers). However after colchicine blockade of axoplasmic transport in this slow muscle some muscle fibers… (More)
The reaction of leech nervous system after elimination of individual mechanosensory neuron by intracellular Pronase injection were studied. In the motor neurons connected with killed cells at 14-90th days after the operation there were the changes of the resting membrane potential and amplitude of postsynaptic potentials developed by the stimulation of… (More)
The effect of norepinephrine, histamine, serotonin and potassium chloride on electrogenesis and contraction was studied on innervated and denervated smooth muscles of cat's nictitating membrane. Denervated smooth muscles generate slow depolarizing potentials with the APs corresponding to tonic and phasic contractions, resp. Tonic contractions occur with no… (More)
The resting membrane potential of innervated and denervated rat diaphragm muscle fibres was studied at different concentrations of Cl-, K+ and Na+ in the external solution and following the furosemide treatment. The Cl- equilibrium potential (ECl) and resting potential are equal in innervated fibres while denervation shifts the ECl value in the positive… (More)