To get around this problem, neurobiologists Susana Lima and Gero Miesenböck of the Yale University School of Medicine in New Haven, Connecticut, inserted a gene that codes for a rat
ion channel into Drosophila fruit flies.
The therapy employs a virus to insert a gene for a common
ion channel into normally blind cells of the retina that survive after the light - responsive rod and cone photoreceptor cells die as a result of diseases such as retinitis pigmentosa.
They also inserted the light - sensitive
ion channels into a different set of neurons in the medulla: glutamatergic neurons, which release the neurotransmitter glutamate.
Not exact matches
Bound to the cell membrane, Na ± K+ATP ase uses the energy of adenosine triphosphate (ATP) molecules to pump sodium out of the cell and potassium
into the cell, maintaining a charge gradient that allows
ions to flow through open
channels.
It is controlled, in part, by a series of
channels on the surface of heart cells that regulate the movement of different
ions into and out of the cells.
(
Ion channels are passages through a cell's membrane that allow charged particles, or
ions,
into or out of the cell.)
An ultraviolet laser frees the ATP, allowing it to rush
into the
ion channels of the modified neurons.
Motor rotation is powered by proton flow
into the cell via
ion channels.
In mammals, proteins called
ion channels embedded in the cell membrane translate temperature information
into electrical signals that activate nerve cells.
This small protein molecule contains a loop which fits, like a key in a lock,
into the
ion channel proteins found on nerve cell membranes, which are used to transport sodium and potassium
ions in and out of the cell.
Researchers at Johns Hopkins have spotted a strong family trait in two distant relatives: The
channels that permit entry of sodium and calcium
ions into cells turn out to share similar means for regulating
ion intake, they say.
This stretching can activate calcium
ion channels, causing a neuron to fire, or can signal the body's repair mechanisms to crank
into overdrive.
This enabled them to «smuggle» calcium
ions into cells and see what happened to sodium
channels when the calcium concentration changed abruptly.
Using a device engineered by Nan Marie Jokerst, Ph.D., a professor of electrical and computer engineering at Duke's Pratt School of Engineering, the researchers showed that UVB caused calcium to flow
into the skin cells, but only when the TRPV4
ion channel was present.
The virus inserts the therapeutic gene
into the cell's DNA and uses its instructions to produce a receptor protein — a modified version of a common glutamate receptor
ion channel - that they display on their surface.
As soon as these cells are exposed to light, the
channels open and positively charged
ions flow
into the muscle cell, which then contracts.
Such
ion channels are often involved in transmitting signals
into cells.
Whereas in the nematode experiment the researchers targeted nanoparticles to temperature - sensitive
ion channels that naturally exist in the membranes of the worms» nerve cells, the scientists inserted the gene for a heat - activated
ion channel called TRPV1
into the human and rat cells.
The
channels allow charged atoms and molecules to travel
into or out of cells; the extra
channels enabled
ions to cross more easily, thereby reducing how polarized these cells had become.
The SCN5A protein winds through the membrane of heart muscle cells, forming a
channel that opens to let sodium
ions flow
into the cells.
Like a type of door, sodium
channels allow sodium
ions to flow
into nerve cells through tiny pores.
When light is shone on the neuron, the
channel opens up and allows electrical
ions to flow
into the cell; a bit like a battery being charged by a solar cell.
In the system, nanoparticles injected
into the brain convert a gentle, external magnetic field
into heat, which triggers heat - sensitive
ion channels that have been genetically engineered
into neurons.
Together, these findings have brought
into focus the central role of
ion - conducting
channels in sustaining normal cellular function and enabled fine - grained analysis of conditions in which the
channels go awry.
What he found was that this switch, called an
ion channel, controls the flow of calcium
into immune cells called macrophages.
Mutations for mammoth hemoglobin, extra hair growth, fat production, down to nuanced climate adaptations such as slightly altered sodium
ion channels in cell membranes have already been engineered
into fibroblast cell lines.
GABA receptors are spread out throughout the brain and they are ligand - activated chloride
channels that when activated, allow the negatively charged chloride
ions across the cell membrane and
into the cell where they reduce cellular activity.