Prab: CSV import

2025-02-23T21:01:40Z

CSV import

← Older revision		Revision as of 21:01, 23 February 2025
Line 45:		Line 45:
	{{Endocrine system}}		{{Endocrine system}}
	{{medicine-stub}}		{{medicine-stub}}
			== Beta cell ==
			<gallery>
			File:Human_Pancreatic_Islet.tif\|Human Pancreatic Islet
			File:Insulin_secretion.png\|Insulin secretion
			</gallery>

Prab: CSV import

2024-05-22T15:41:19Z

CSV import

New page

[[File:Human_Pancreatic_Islet.tif|thumb|Human_Pancreatic_Islet.tif]] '''Beta cell'''

'''Beta cells''' (or '''β cells''') are a type of cell found in the [[pancreas]] within clusters known as the [[islets of Langerhans]]. They make up 50-70% of the cells in the islets. Beta cells are responsible for the production, storage, and release of the hormone [[insulin]], which plays a crucial role in regulating [[blood glucose]] levels.

== Function ==
The primary function of beta cells is to sense blood glucose levels and secrete insulin in response. Insulin is a hormone that facilitates the uptake of glucose by tissues, thereby lowering blood glucose levels. When blood glucose levels rise, such as after a meal, beta cells release insulin into the bloodstream. This process is essential for maintaining [[homeostasis]] and ensuring that cells receive adequate energy.

== Insulin Secretion ==
Insulin secretion by beta cells involves several steps:
1. **Glucose Uptake**: Glucose enters the beta cells through [[GLUT2]] transporters.
2. **Metabolism**: Inside the cell, glucose is metabolized to produce [[ATP]].
3. **Depolarization**: The increase in ATP/ADP ratio leads to the closure of [[ATP-sensitive potassium channel|ATP-sensitive potassium channels]], causing cell membrane depolarization.
4. **Calcium Influx**: Depolarization opens [[voltage-dependent calcium channel|voltage-dependent calcium channels]], allowing calcium ions to enter the cell.
5. **Insulin Release**: The influx of calcium triggers the exocytosis of insulin-containing vesicles, releasing insulin into the bloodstream.

== Role in Diabetes ==
Beta cells play a critical role in the pathophysiology of [[diabetes mellitus]]. In [[type 1 diabetes]], an autoimmune response targets and destroys beta cells, leading to insufficient insulin production. In [[type 2 diabetes]], beta cells may become dysfunctional or insufficient in the face of increased insulin demand due to [[insulin resistance]].

== Regeneration and Research ==
Research into beta cell regeneration and replacement is ongoing, with the aim of finding treatments for diabetes. Potential strategies include:
* **Stem cell therapy**: Differentiating stem cells into functional beta cells.
* **Islet transplantation**: Transplanting islets from a donor pancreas.
* **Gene therapy**: Modifying genes to enhance beta cell function or survival.

== See Also ==
* [[Alpha cell]]
* [[Delta cell]]
* [[Pancreas]]
* [[Insulin]]
* [[Diabetes mellitus]]
* [[Islets of Langerhans]]

== References ==
{{Reflist}}

== External Links ==
{{Commons category|Beta cells}}

[[Category:Endocrine system]]
[[Category:Pancreas]]
[[Category:Diabetes]]
[[Category:Cell biology]]
[[Category:Hormones]]

{{Endocrine system}}
{{medicine-stub}}

Beta cell - Revision history

Prab: CSV import

Prab: CSV import