Chemistry:Griseofulvin

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Short description: Antifungal medication used for dermatophytoses
Griseofulvin
Griseofulvin.svg
Griseofulvin 3D.png
Clinical data
Trade namesGris-peg, Grifulvin V, others
AHFS/Drugs.comMonograph
MedlinePlusa682295
Pregnancy
category
  • AU: D
Routes of
administration		By mouth
ATC code
Legal status
Legal status
  • AU: S4 (Prescription only)
  • UK: POM (Prescription only)
  • US: ℞-only
Pharmacokinetic data
BioavailabilityHighly variable (25 to 70%)
MetabolismLiver (demethylation and glucuronidation)
Elimination half-life9–21 hours
Identifiers
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
Chemical and physical data
FormulaC17H17ClO6
Molar mass352.766 g·mol−1
3D model (JSmol)
  (verify)

Griseofulvin is an antifungal medication used to treat a number of types of dermatophytoses (ringworm).[1] This includes fungal infections of the nails and scalp, as well as the skin when antifungal creams have not worked.[2] It is taken by mouth.[1]

Common side effects include allergic reactions, nausea, diarrhea, headache, trouble sleeping, and feeling tired.[1] It is not recommended in people with liver failure or porphyria.[1] Use during or in the months before pregnancy may result in harm to the baby.[1][2] Griseofulvin works by interfering with fungal mitosis.[1]

Griseofulvin was discovered in 1939 from the soil fungus Penicillium griseofulvum.[3][4][5] It is on the World Health Organization's List of Essential Medicines.[6]

Medical uses

Griseofulvin is used orally only for dermatophytosis. It is ineffective topically. It is reserved for cases in which topical treatment with creams is ineffective.[7]

Terbinafine given for 2 to 4 weeks is at least as effective as griseofulvin given for 6 to 8 weeks for treatment of Trichophyton scalp infections. However, griseofulvin is more effective than terbinafine for treatment of Microsporum scalp infections.[8][9]

Pharmacology

Pharmacodynamics

The drug binds to tubulin, interfering with microtubule function, thus inhibiting mitosis. It binds to keratin in keratin precursor cells and makes them resistant to fungal infections. The drug reaches its site of action only when hair or skin is replaced by the keratin-griseofulvin complex. Griseofulvin then enters the dermatophyte through energy-dependent transport processes and binds to fungal microtubules. This alters the processing for mitosis and also underlying information for deposition of fungal cell walls.[citation needed]

Biosynthesis

It is produced industrially by fermenting the fungus Penicillium griseofulvum.[10][11][12]

The first step in the biosynthesis of griseofulvin by P. griseofulvin is the synthesis of the 14-carbon poly-β-keto chain by a type I iterative polyketide synthase (PKS) via iterative addition of 6 malonyl-CoA to an acyl-CoA starter unit. The 14-carbon poly-β-keto chain undergoes cyclization/aromatization, using cyclase/aromatase, respectively, through a Claisen and aldol condensation to form the benzophenone intermediate. The benzophenone intermediate is then methylated via S-adenosyl methionine (SAM) twice to yield griseophenone C. The griseophenone C is then halogenated at the activated site ortho to the phenol group on the left aromatic ring to form griseophenone B. The halogenated species then undergoes a single phenolic oxidation in both rings forming the two oxygen diradical species. The right oxygen radical shifts alpha to the carbonyl via resonance allowing for a stereospecific radical coupling by the oxygen radical on the left ring forming a tetrahydrofuranone species.[13] The newly formed grisan skeleton with a spiro center is then O-methylated by SAM to generate dehydrogriseofulvin. Ultimately, a stereoselective reduction of the olefin on dehydrogriseofulvin by NADPH affords griseofulvin.[14][15]

Toxicology

Mice

Griseofulvin is found to alter the bile metabolism of mice by Yokoo et al. 1979. The same team went on to find a similar effect on mice by a chemically unrelated substance, 3,5-diethoxycarbonyl-1,4-dihydrocollidine, in Yokoo et al. 1982 and Tsunoo et al. 1987.[16]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "Griseofulvin". The American Society of Health-System Pharmacists. https://www.drugs.com/monograph/griseofulvin.html. 
  2. ↑ 2.0 2.1 WHO Model Formulary 2008. World Health Organization. 2009. p. 149. ISBN 9789241547659. 
  3. ↑ (in en) Disinfection, Sterilization, and Preservation. Lippincott Williams & Wilkins. 2001. p. 631. ISBN 9780683307405. https://books.google.com/books?id=3f-kPJ17_TYC&pg=PA631. 
  4. ↑ Handbook of Preservatives. Synapse Info Resources. 2004. pp. 406. ISBN 978-1-890595-66-1. https://books.google.com/books?id=XZ2QB7bu5LwC&pg=PA406. 
  5. ↑ "Fungal metabolites as pharmaceuticals". Australian Journal of Chemistry 67 (6): 827–843. 2014. doi:10.1071/ch13639. 
  6. ↑ World Health Organization model list of essential medicines: 21st list 2019. Geneva: World Health Organization. 2019. WHO/MVP/EMP/IAU/2019.06. License: CC BY-NC-SA 3.0 IGO. 
  7. ↑ (in German) Arzneimittelwirkungen (8 ed.). Stuttgart: Wissenschaftliche Verlagsgesellschaft. 2001. p. 838. ISBN 3-8047-1763-2. 
  8. ↑ "Griseofulvin versus terbinafine in the treatment of tinea capitis: a meta-analysis of randomized, clinical trials". Pediatrics 114 (5): 1312–1315. November 2004. doi:10.1542/peds.2004-0428. PMID 15520113. 
  9. ↑ "Systemic antifungal therapy for tinea capitis in children". The Cochrane Database of Systematic Reviews 2016 (5): CD004685. May 2016. doi:10.1002/14651858.CD004685.pub3. PMID 27169520. 
  10. ↑ "Studies in the biochemistry of micro-organisms: Griseofulvin, C(17)H(17)O(6)Cl, a metabolic product of Penicillium griseo-fulvum Dierckx". The Biochemical Journal 33 (2): 240–248. February 1939. doi:10.1042/bj0330240. PMID 16746904. 
  11. ↑ "The structure of griseofulvin.". Chemistry and Industry (London) 11: 219–220. 1951. 
  12. ↑ "762. Griseofulvin. Part IV. Structure". Journal of the Chemical Society (Resumed): 3977. 1952. doi:10.1039/JR9520003977. 
  13. ↑ "Studies in relation to biosynthesis I. Some possible routes to derivatives of orcinol and phloroglucinol". Australian Journal of Chemistry 6 (4): 360. 1953. doi:10.1071/ch9530360. 
  14. ↑ Medicinal Natural Products: A Biosynthetic Approach (3rd ed.). UK: John Wiley & Sons Ltd. 2009. ISBN 978-0-471-97478-9. 
  15. ↑ "Biosynthesis of griseofulvin". Journal of the American Chemical Society 98 (17): 5380–5386. August 1976. doi:10.1021/ja00433a053. PMID 956563. 
  16. ↑ "Toxic effects of griseofulvin: disease models, mechanisms, and risk assessment". Critical Reviews in Toxicology (Taylor & Francis) 27 (5): 495–537. September 1997. doi:10.3109/10408449709078444. PMID 9347226. 

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