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Senescence: Difference between revisions
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Senescence is the process of the aging of [[cells]] which eventually leads to cell [[death]]. Many people think that if senescence was prevented, people could live much longer, if not forever. There is even an area of science, called gerontology, that studies the aging process in order to prevent age-related diseases and disabilities. | Senescence is the process of the aging of [[cells]] which eventually leads to cell [[death]]. Many people think that if senescence was prevented, people could live much longer, if not forever. There is even an area of science, called gerontology, that studies the aging process in order to prevent age-related diseases and disabilities. | ||
== | == Cellular Senescence == | ||
[[Image:Telomere caps.gif|thumb|250px|left|The white spots at the end of the chromosomes are telomere caps]] | [[Image:Telomere caps.gif|thumb|250px|left|The white spots at the end of the chromosomes are telomere caps]] | ||
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Senescence is thought to be due to the degradation of [[telomeres]]. Telomeres are caps at the end of [[chromosomes]] that prevent chromosomes from fusing together. After each division of the cell, the length of the telomere shortens. When the telomere is finally gone, the cell cannot divide anymore and dies. [[Cancer]] cells can avoid this eventual death by introducing telomerase into its cells. Telomerase is a reverse-transcriptase enzyme that makes the telomeres longer after each division, thus preventing them from disappearing. [http://www.senescence.info/telomeres.html] | Senescence is thought to be due to the degradation of [[telomeres]]. Telomeres are caps at the end of [[chromosomes]] that prevent chromosomes from fusing together. After each division of the cell, the length of the telomere shortens. When the telomere is finally gone, the cell cannot divide anymore and dies. [[Cancer]] cells can avoid this eventual death by introducing telomerase into its cells. Telomerase is a reverse-transcriptase enzyme that makes the telomeres longer after each division, thus preventing them from disappearing. [http://www.senescence.info/telomeres.html] | ||
== Senesence Hormones == | |||
[[Ethylene]] is an important senescence hormone in plants because it stimulates plant growth and speeds up the process of apoptosis. Ethylene also is involved in the [[abscission]] of [[leaves]] and the fading of [[flowers]]. | |||
== Apoptosis == | == Apoptosis == | ||
:''Main Article: [[Apoptosis]]'' | :''Main Article: [[Apoptosis]]'' | ||
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== Related References == | == Related References == | ||
