One neuron, many units?

Article Abstract:

It has been questioned if the neuron (nerve cell) is the functional unit of the nervous system or if portions of the neuron are functional by themselves. In the Purkinje cells of the cerebellum, signals have been seen in areas of the dendrites (the branch-like area of the neuron that carries the nerve impulse towards the neuron cell body) in response to changes in the concentrations of calcium. Investigators have now been able to measure the activity in parts of the neuron. Research indicated three to six separate areas in the dendrite where there were independent signals. It is not known how many types of neurons will have dendritic units that can function independently, as there are neurons that do not appear to have independent activity. The existence of independent units makes it more difficult to understand how behaviors are generated from nerve impulses, as some types of neurons interact with many other neurons. (Consumer Summary produced by Reliance Medical Information, Inc.)

Neurology, Dendrites

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Sorting out the neuron

Article Abstract:

All cells have a degree of asymmetry or polarization, and some have obvious physical barriers to free diffusion of membrane components. Neurons lack such barriers, but certain proteins are obviously limited to specific areas of the plasma membrane. Winckler and colleagues have found a barrier to protein diffusion in the membrane of cultured neurons, and characterized it. The results suggested that membrane proteins interact with a local, specialized areas of the protein cytoskeleton which impedes membrane protein diffusion.

Observations, Cell research, Cytological research

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Neuronal self-reliance

Article Abstract:

Dorsal root ganglion (DRG) neurons on attaining matured state showed no need for trophic support from nerve growth factor (NGF) and many other factors,indicating self-reliance capabilities development in the neurons. Neurons showed dependence on receiving signals for survival which were self-produced by the neurons in some cases. Development from target-derived survival signals to an autocrine supply of survival signals by neurons during growth is discussed.

Neurotrophic functions, Neurotrophins

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