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← Older revision		Revision as of 02:41, 11 December 2024
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	~~'''Polyamines''' are organic compounds that are essential for cell growth and development. They are found~~ in ~~all living organisms and are involved in a variety of~~ biological ~~processes, including DNA synthesis, protein synthesis, and cell division~~. ~~Polyamines are also involved in the regulation of ion channels and the modulation of the immune response~~.		{{Short description\|Overview of polyamine use in biological systems}}
			{{Use dmy dates\|date=October 2023}}
			[[File:Spermidine-2D-skeletal.svg\|thumb\|Spermidine structure]]
			[[File:Spermine.svg\|thumb\|Spermine structure]]
			[[File:Tris(2-aminoethyl)amine.svg\|thumb\|Tris(2-aminoethyl)amine structure]]
			[[File:Cyclen.svg\|thumb\|Cyclen structure]]

	~~== Structure~~ and ~~Function ==~~		'''Polyamines''' are organic compounds having two or more primary amino groups –NH2. They are involved in cellular metabolism and are essential for cell growth and function. The most common polyamines are [[putrescine]], [[spermidine]], and [[spermine]]. These compounds are found in all living cells and are particularly abundant in rapidly growing tissues.

	Polyamines ~~are small, positively charged molecules that are able to interact with negatively charged molecules, such as DNA and RNA. This allows them to~~ play a role in ~~the stabilization of the DNA double helix and the regulation of gene expression. Polyamines are also involved in the regulation of ion channels~~, ~~which are essential for cell signaling and the maintenance of cellular homeostasis.~~		==Biological Role==
			Polyamines play a crucial role in various biological processes, including:

	~~== Biosynthesis~~ and ~~Metabolism ==~~		* '''Cell Growth and Proliferation''': Polyamines are essential for cell division and growth. They stabilize DNA structures and are involved in the synthesis of nucleic acids and proteins.
			* '''Gene Expression''': They influence gene expression by modulating the structure of chromatin and interacting with DNA and RNA.
			* '''Ion Channel Regulation''': Polyamines regulate ion channels and receptors, affecting cellular signaling and homeostasis.
			* '''Stress Response''': They help cells respond to environmental stress by stabilizing membranes and protecting against oxidative damage.

	~~Polyamines are synthesized from the amino acids arginine and ornithine. The biosynthesis of polyamines~~ involves ~~several enzymatic reactions, including~~ the ~~conversion of arginine to ornithine~~, ~~the decarboxylation of ornithine to putrescine~~, and ~~the addition~~ of ~~aminopropyl groups to putrescine to form spermidine and spermine~~. ~~Polyamines are metabolized by the~~ enzymes polyamine ~~oxidase and spermidine/spermine N1-acetyltransferase.~~		==Polyamine Metabolism==
			Polyamine metabolism involves the synthesis, degradation, and transport of polyamines. The key enzymes involved in polyamine biosynthesis are:

	~~== Role in Disease ==~~		* '''Ornithine Decarboxylase (ODC)''': Catalyzes the conversion of ornithine to putrescine.
			* '''S-adenosylmethionine Decarboxylase (SAMDC)''': Converts S-adenosylmethionine to decarboxylated S-adenosylmethionine, a precursor for spermidine and spermine synthesis.
			* '''Spermidine Synthase and Spermine Synthase''': Catalyze the formation of spermidine and spermine from putrescine.

	~~Abnormal levels of polyamines~~ have been ~~associated with a variety of~~ diseases, including cancer, ~~cardiovascular disease, and neurological disorders. In cancer, increased polyamine~~ levels ~~have been observed in tumor cells, suggesting a role for polyamines in tumor growth and progression~~. ~~In cardiovascular disease, polyamines have been implicated in the regulation~~ of ~~blood pressure and heart rate. In neurological disorders~~, ~~polyamines have been shown to modulate the activity of NMDA receptors~~, ~~which~~ are ~~involved~~ in ~~learning and memory~~.		==Clinical Significance==
			Polyamines have been implicated in various diseases, including cancer, where their levels are often elevated. Inhibitors of polyamine synthesis, such as [[difluoromethylornithine]] (DFMO), are being explored as potential therapeutic agents in cancer treatment.

	== ~~Therapeutic Potential~~ ==		==Research and Applications==
			Research into polyamines is ongoing, with studies focusing on their role in aging, neurodegenerative diseases, and as potential biomarkers for disease diagnosis. Polyamines are also being investigated for their potential in enhancing crop growth and stress resistance in agriculture.

	Given their role in disease, polyamines have been explored as potential therapeutic targets. Inhibitors of polyamine biosynthesis have been developed and tested in preclinical and clinical studies for the treatment of cancer. In addition, polyamine analogs have been investigated for their potential to modulate the immune response and to protect against neurodegenerative diseases.		==Also see==
			* [[Putrescine]]
			* [[Spermidine]]
			* [[Spermine]]
			* [[Ornithine decarboxylase]]
			* [[Polyamine oxidase]]

			{{Biochemistry}}
			{{Cell biology}}

	[[Category:Biochemistry]]		[[Category:Biochemistry]]
	[[Category:Cell biology]]		[[Category:Cell biology]]
	[[Category:~~Molecular biology~~]]		[[Category:Organic compounds]]
	~~[[Category:Neuroscience]]~~
	~~[[Category:Cardiovascular system]]~~
	~~[[Category:Cancer]]~~
	~~[[Category:Therapeutics]]~~

	~~{{stub}}~~
	~~{{dictionary-stub1}}~~

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2024-02-25T00:36:28Z

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'''Polyamines''' are organic compounds that are essential for cell growth and development. They are found in all living organisms and are involved in a variety of biological processes, including DNA synthesis, protein synthesis, and cell division. Polyamines are also involved in the regulation of ion channels and the modulation of the immune response.

== Structure and Function ==

Polyamines are small, positively charged molecules that are able to interact with negatively charged molecules, such as DNA and RNA. This allows them to play a role in the stabilization of the DNA double helix and the regulation of gene expression. Polyamines are also involved in the regulation of ion channels, which are essential for cell signaling and the maintenance of cellular homeostasis.

== Biosynthesis and Metabolism ==

Polyamines are synthesized from the amino acids arginine and ornithine. The biosynthesis of polyamines involves several enzymatic reactions, including the conversion of arginine to ornithine, the decarboxylation of ornithine to putrescine, and the addition of aminopropyl groups to putrescine to form spermidine and spermine. Polyamines are metabolized by the enzymes polyamine oxidase and spermidine/spermine N1-acetyltransferase.

== Role in Disease ==

Abnormal levels of polyamines have been associated with a variety of diseases, including cancer, cardiovascular disease, and neurological disorders. In cancer, increased polyamine levels have been observed in tumor cells, suggesting a role for polyamines in tumor growth and progression. In cardiovascular disease, polyamines have been implicated in the regulation of blood pressure and heart rate. In neurological disorders, polyamines have been shown to modulate the activity of NMDA receptors, which are involved in learning and memory.

== Therapeutic Potential ==

Given their role in disease, polyamines have been explored as potential therapeutic targets. Inhibitors of polyamine biosynthesis have been developed and tested in preclinical and clinical studies for the treatment of cancer. In addition, polyamine analogs have been investigated for their potential to modulate the immune response and to protect against neurodegenerative diseases.

[[Category:Biochemistry]]
[[Category:Cell biology]]
[[Category:Molecular biology]]
[[Category:Neuroscience]]
[[Category:Cardiovascular system]]
[[Category:Cancer]]
[[Category:Therapeutics]]

{{stub}}
{{dictionary-stub1}}

Polyamine - Revision history

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