Cell signaling is a method of communication of one cell with other cells. This is done by following methods like
- Contact dependent cell signaling
- Paracrine signaling
- Autocrine signaling
- Endocrine signaling
- Synaptic signaling.
Cells need to contact with other cells for normal physiology of the body. Sometimes they signal the nearby cells, and other times they signal to distant cells.
Types of cell signaling.
Contact dependent cell signaling:
Here the cell signal occurs in between cells having a contact at the cell membrane level. One cell has a signal molecule, and the other has a receptor moiety on their cell surfaces.
This is a signal where one cell signals nearby neighboring cells.
Examples: Cytokines like the prostaglandins show this type of signaling
Autocrine signaling: This is a type of cell signal where a cell gives a signal to itself. A signal molecule is released out of the cell. This molecule, in return, acts and gives a signal to the same cell through surface receptors.
This is a signal which is given by one cell to another cell located in a distant region. The signal molecule is released into the bloodstream. This is then carried away and distributed by the blood to other cells. These distant cells receive the signal.
Nerve cells secrete acetylcholine, dopamine, and other neurotransmitters.