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Thymulin (also known as thymic factor or its old name facteur thymique serique) is a nonapeptide produced by two distinct epithelial populations in the thymus first described by Bach in 1977. [1] It requires zinc for biological activity. Its peptide sequence is H-Pyr-Ala-Lys-Ser-Gln-Gly-Gly-Ser-Asn-OH.

The hormone is believed to be involved in T-cell differentiation and enhancement of T and NK cell actions. [1] Besides this rather paracrine or auto-organic effects on the thymus dependent immune system, thymulin seems to have neuroendocrine effects as well. There exist bidirectional interactions between thymic epithelium and the hypothalamus-pituitary axis (for example, thymulin follows a circadian rhythm and physiologically elevated ACTH levels correlate positively with thymulin plasma levels and vice versa [2] ).

A recent focus has been on the role of thymulin as an effector on proinflammatory mediators/cytokines. A peptide analog of thymulin (PAT) has been found to have analgesic effects in higher concentrations and particularly neuroprotective anti-inflammatory effects in the CNS. [3] Astrocytes seem to be the target for thymulin for this effect. Researchers hope to develop drugs thwarting inflammatory processes associated with neurodegenerative diseases and even rheumatism with the help of thymulin analogs.

Moreover, thymulin has been associated with anorexia nervosa. [4]

See also

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  1. 1 2 Bach J, Bardenne M, Pleau J, Rosa J (1977). "Biochemical characterisation of a serum thymic factor". Nature. 266 (5597): 55–7. Bibcode:1977Natur.266...55B. doi:10.1038/266055a0. PMID   300146.
  2. Hadley AJ, Rantle CM, Buckingham JC (1997). "Thymulin stimulates corticotrophin release and cyclic nucleotide formation in the rat anterior pituitary gland". Neuroimmunomodulation. 4 (2): 62–9. doi:10.1159/000097322. PMID   9483196.
  3. Dardenne M, Saade N, Safieh-Garabedian B (2006). "Role of thymulin or its analogue as a new analgesic molecule". Ann. N. Y. Acad. Sci. 1088 (1): 153–63. Bibcode:2006NYASA1088..153D. doi:10.1196/annals.1366.006. PMID   17192563.
  4. Wade S, Bleiberg F, Mossé A, et al. (1985). "Thymulin (Zn-facteur thymique serique) activity in anorexia nervosa patients". Am. J. Clin. Nutr. 42 (2): 275–80. doi:10.1093/ajcn/42.2.275. PMID   3927699.