WordNet
- hormone secreted by the thymus; stimulates immunological activity of lymphoid tissue
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出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2015/07/15 18:45:20」(JST)
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NMR structure of the bovine β9-thymosin polypeptide based on the PDB 1HJ0 coordinates.
Thymosins are small proteins present in many animal tissues. They are named thymosins because they were originally isolated from the thymus, but most are now known to be present in many other tissues.[1] Thymosins have diverse biological activities, and two in particular, thymosins α1 and β4, have potentially important uses in medicine, some of which have already progressed from the laboratory to the clinic. In relation to diseases, thymosins have been categorized as biological response modifiers.[2]
Contents
- 1 Discovery
- 2 Doping in sports
- 3 See also
- 4 References
- 5 External links
Discovery
The discovery of thymosins in the mid 1960s emerged from investigations of the role of the thymus in development of the vertebrate immune system. Begun by Allan Goldstein in the Laboratory of Abraham White at the Albert Einstein College of Medicine in New York, the work continued at University of Texas Medical Branch in Galveston and at The George Washington University School of Medicine and Health Sciences in Washington D.C. The supposition that the role of the thymus might involve a hormone-like mechanism led to the isolation from thymus tissue of a biologically active preparation. Known as "Thymosin Fraction 5", this was able to restore some aspects of immune function in animals lacking thymus gland. Fraction 5 was found to contain over 40 small peptides (molecular weights ranging from 1000 to 15,000 Da.),[3] which were named "thymosins" and classified as α, β and γ thymosins on the basis of their behaviour in an electric field. Although found together in Fraction 5, they are now known to be structurally and genetically unrelated. Thymosin β1 was found to be ubiquitin (truncated by two C-terminal glycine residues).[4]
When individual thymosins were isolated from Fraction 5 and characterized, they were found to have extremely varied and important biological properties. However they are not truly thymic hormones in that they are not restricted in occurrence to thymus and several are widely distributed throughout many different tissues.[3][4][5]
Doping in sports
Thymosin beta-4 was allegedly used by some players in various Australian football codes and is under investigation by the Australian Sports Anti-Doping Authority for anti-doping violations.[6][7]
See also
- Thymosin α1
- Beta thymosins
References
- ^ Hannappel, E; Huff, T (2003). "The thymosins. Prothymosin alpha, parathymosin, and beta-thymosins: structure and function.". Vitamins and hormones 66: 257–96. PMID 12852257.
- ^ Low, TL; Goldstein, AL (1984). "Thymosins: structure, function and therapeutic applications.". Thymus 6 (1-2): 27–42. PMID 6087503.
- ^ a b Goldstein AL (September 2007). "History of the discovery of the thymosins". Ann. N. Y. Acad. Sci. 1112: 1–13. doi:10.1196/annals.1415.045. PMID 17600284.
- ^ a b Hannappel E (September 2007). "beta-Thymosins". Ann. N. Y. Acad. Sci. 1112: 21–37. doi:10.1196/annals.1415.018. PMID 17468232.
- ^ Garaci E (September 2007). "Thymosin alpha1: a historical overview". Ann. N. Y. Acad. Sci. 1112: 14–20. doi:10.1196/annals.1415.039. PMID 17567941.
- ^ Ho, EN; Kwok, WH; Lau, MY; Wong, AS; Wan, TS; Lam, KK; Schiff, PJ; Stewart, BD (23 November 2012). "Doping control analysis of TB-500, a synthetic version of an active region of thymosin β₄, in equine urine and plasma by liquid chromatography-mass spectrometry.". Journal of chromatography. A 1265: 57–69. doi:10.1016/j.chroma.2012.09.043. PMID 23084823.
- ^ https://theconversation.edu.au/cronulla-sharks-and-thymosin-beta-4-is-it-doping-12694 (Feb/Mar 2013)
- Koh, B. (2013). Cronulla Sharks and thymosin beta-4 … is it doping? Retrieved from http://theconversation.edu.au/cronulla-sharks-and-thymosin-beta-4-is-it-doping-12694
External links
- thymosin at the US National Library of Medicine Medical Subject Headings (MeSH)
Hormones
|
|
Endocrine
glands |
Hypothalamic-
pituitary
|
Hypothalamus
|
- GnRH
- TRH
- Dopamine
- CRH
- GHRH/Somatostatin
- Melanin concentrating hormone
|
|
Posterior pituitary
|
|
|
Anterior pituitary
|
- α
- FSH
- FSHB
- LH
- LHB
- TSH
- TSHB
- CGA
- Prolactin
- POMC
- CLIP
- ACTH
- MSH
- Endorphins
- Lipotropin
- GH
|
|
|
Adrenal axis
|
- Adrenal cortex
- aldosterone
- cortisol
- DHEA
- Adrenal medulla
- epinephrine
- norepinephrine
|
|
Thyroid
|
- Thyroid hormone
- calcitonin
- Thyroid axis
|
|
Parathyroid
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|
|
|
Gonadal axis
|
Testis
|
|
|
Ovary
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- estradiol
- progesterone
- activin and inhibin
- relaxin (pregnancy)
|
|
Placenta
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- hCG
- HPL
- estrogen
- progesterone
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|
|
Pancreas
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- glucagon
- insulin
- amylin
- somatostatin
- pancreatic polypeptide
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|
Pineal gland
|
- melatonin
- N,N-dimethyltryptamine
- 5-methoxy-N,N-dimethyltryptamine
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|
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Other |
Thymus
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- Thymosins
- Thymosin α1
- Beta thymosins
- Thymopoietin
- Thymulin
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|
Digestive system
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Stomach
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|
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Duodenum
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- CCK
- Incretins
- secretin
- motilin
- VIP
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Ileum
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- enteroglucagon
- peptide YY
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Liver/other
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- Insulin-like growth factor
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|
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Adipose tissue
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- leptin
- adiponectin
- resistin
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Skeleton
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|
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Kidney
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- JGA (renin)
- peritubular cells
- calcitriol
- prostaglandin
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Heart
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Index of hormones
|
|
Description |
- Glands
- Hormones
- thyroid
- mineralocorticoids
- Physiology
- Development
|
|
Disease |
- Diabetes
- Congenital
- Neoplasms and cancer
- Other
- Symptoms and signs
|
|
Treatment |
- Procedures
- Drugs
- calcium balance
- corticosteroids
- oral hypoglycemics
- pituitary and hypothalamic
- thyroid
|
|
|
UpToDate Contents
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English Journal
- Interleukin-18-mediated interferon-gamma secretion is regulated by thymosin beta 4 in human NK cells.
- Lee HR, Yoon SY, Song SB, Park Y, Kim TS, Kim S, Hur DY, Song HK, Park H, Cho D.SourceDepartment of Life Science, Sookmyung Women's University, Seoul, Republic of Korea.
- Immunobiology.Immunobiology.2011 Oct;216(10):1155-62. Epub 2011 Apr 13.
- Thymosin beta 4 (Tβ4) is the major G-actin sequestering molecule and is abundant in lymphoid tissues. However, it is not clear what regulates Tβ4 expression and what its function is on natural killer (NK) cells. We investigated whether interleukin-18 (IL-18) has a role in Tβ4 expression and if en
- PMID 21742406
- Thymosin beta 4 induces colon cancer cell migration and clinical metastasis via enhancing ILK/IQGAP1/Rac1 signal transduction pathway.
- Tang MC, Chan LC, Yeh YC, Chen CY, Chou TY, Wang WS, Su Y.SourceInstitute of Biopharmaceutical Sciences, National Yang-Ming University, Taipei, Taiwan, ROC.
- Cancer letters.Cancer Lett.2011 Sep 28;308(2):162-71. Epub 2011 May 28.
- Thymosin β(4) (Tβ(4)) overexpression increases cell migration and tumor metastasis. Hence, understanding the mechanism of cancer cell migration induced by Tβ(4) may provide means to inhibit their metastasis. We demonstrated higher Rac1 activities and expression levels of IQGAP1 and ILK in highly
- PMID 21621326
Japanese Journal
- Muscle injury-induced thymosin β4 acts as a chemoattractant for myoblasts
- Tokura Yuka,Nakayama Yuki,Fukada So-ichiro [他]
- Journal of Biochemistry 149(1), 43-48, 2011-01
- NAID 40017664413
- The homolog of Ciboulot in the termite (Hodotermopsis sjostedti) : a multimeric β-thymosin involved in soldier-specific morphogenesis
- Koshikawa Shigeyuki,Cornette Richard,Matsumoto Tadao,Miura Toru
- BMC Developmental Biology 10, 63, 2010-06-08
- Background: Caste differentiation in social insects is a type of polyphenism that enables division of labor among members of a colony. This elaborate social integration has attracted broad interest, a …
- NAID 120002277517
Related Links
- Thymosins are small proteins present in many animal tissues. They are named thymosins because they were originally isolated from the thymus, but most are now known to be present in many other tissues. Thymosins have diverse biological ...
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