Jump to content

Malassezia: Difference between revisions

From Wikipedia, the free encyclopedia
Browse history interactively
← Previous editNext edit →
Content deleted Content added
VisualWikitext
News sources as evidence of WP:Notability
Add few words on M. Restricta. Add both secondary (revision) and primary sources for clear understanding. Link news website as evidence of WP:Notabiliyt
Tags: Reverted nowiki added Visual edit
Line 45: Line 45:
* ''[[M. psittaci]]''<ref name="pmid30728599">{{cite journal |vauthors=Lorch JM, Palmer JM, Vanderwolf KJ, etal |title=''Malassezia vespertilionis'' sp. nov. :a new cold-tolerant species of yeast isolated from bats |journal=Persoonia |volume= 41 |pages=56–70 |year=2018 |pmid=30728599 |pmc=6344816 |doi=10.3767/persoonia.2018.41.04|url=http://www.repository.naturalis.nl/document/654583 }}</ref>
* ''[[M. psittaci]]''<ref name="pmid30728599">{{cite journal |vauthors=Lorch JM, Palmer JM, Vanderwolf KJ, etal |title=''Malassezia vespertilionis'' sp. nov. :a new cold-tolerant species of yeast isolated from bats |journal=Persoonia |volume= 41 |pages=56–70 |year=2018 |pmid=30728599 |pmc=6344816 |doi=10.3767/persoonia.2018.41.04|url=http://www.repository.naturalis.nl/document/654583 }}</ref>
...
...

== Malassezia restricta ==
''M restricta'' is a commonly met fungus that naturally colonizes the skin of many animals including humans, grows both [[Anaerobic organism|anaerobically]] and [[Aerobic|aerobically]]. It requires long chain [[fatty acid]]<nowiki/>s for growth.<ref>{{Cite journal|last=Limon|first=Jose J.|last2=Tang|first2=Jie|last3=Li|first3=Dalin|last4=Wolf|first4=Andrea J.|last5=Michelsen|first5=Kathrin S.|last6=Funari|first6=Vince|last7=Gargus|first7=Matthew|last8=Nguyen|first8=Christopher|last9=Sharma|first9=Purnima|last10=Maymi|first10=Viviana I.|last11=Iliev|first11=Iliyan D.|date=2019-03-13|title=Malassezia Is Associated with Crohn’s Disease and Exacerbates Colitis in Mouse Models|url=https://www.cell.com/cell-host-microbe/abstract/S1931-3128(19)30045-9|journal=Cell Host & Microbe|language=English|volume=25|issue=3|pages=377–388.e6|doi=10.1016/j.chom.2019.01.007|issn=1931-3128|pmid=30850233}}</ref> Originally [[Commensalism|commensal]] it's been associated with [[Crohn's disease|Crohn's Disease]] and implicated in exacerbating colitis in [[Gnotobiosis|gnotobiotic]] mice.<ref>{{Cite journal|last=Wu|first=Xiaoyan|last2=Xia|first2=Yaoyao|last3=He|first3=Fang|last4=Zhu|first4=Congrui|last5=Ren|first5=Wenkai|date=2021-03-14|title=Intestinal mycobiota in health and diseases: from a disrupted equilibrium to clinical opportunities|url=https://pubmed.ncbi.nlm.nih.gov/33715629/|journal=Microbiome|volume=9|issue=1|pages=60|doi=10.1186/s40168-021-01024-x|issn=2049-2618|pmc=7958491|pmid=33715629}}</ref><ref>{{Cite web|title=A fungus usually found on skin might play a role in Crohn's disease|url=https://www.sciencedaily.com/releases/2019/03/190305112836.htm|access-date=2021-03-23|website=ScienceDaily|language=en}}</ref> <ref>{{Cite journal|last=Limon|first=Jose J.|last2=Tang|first2=Jie|last3=Li|first3=Dalin|last4=Wolf|first4=Andrea J.|last5=Michelsen|first5=Kathrin S.|last6=Funari|first6=Vince|last7=Gargus|first7=Matthew|last8=Nguyen|first8=Christopher|last9=Sharma|first9=Purnima|last10=Maymi|first10=Viviana I.|last11=Iliev|first11=Iliyan D.|date=2019-03-13|title=Malassezia Is Associated with Crohn's Disease and Exacerbates Colitis in Mouse Models|url=https://pubmed.ncbi.nlm.nih.gov/30850233/|journal=Cell Host & Microbe|volume=25|issue=3|pages=377–388.e6|doi=10.1016/j.chom.2019.01.007|issn=1934-6069|pmc=6417942|pmid=30850233}}</ref>


== Role in human diseases ==
== Role in human diseases ==

Revision as of 21:10, 23 March 2021

Malassezia
Malassezia furfur in skin scale from a patient with tinea versicolor
Scientific classification
Kingdom:
Fungi
Division:
Basidiomycota
Class:
Exobasidiomycetes
Order:
Malasseziales
Family:
Malasseziaceae
Genus:
Malassezia

Malassezia (formerly known as Pityrosporum) is a genus of fungi. Malassezia is naturally found on the skin surfaces of many animals, including humans. In occasional opportunistic infections, some species can cause hypopigmentation or hyperpigmentation on the trunk and other locations in humans. Allergy tests for this fungus are available.

Nomenclature

A 25-year-old man with pityrosporum folliculitis and electron micrograph of his skin, showing Malassezia spores.[1]

Due to progressive changes in their nomenclature, some confusion exists about the naming and classification of Malassezia yeast species. Work on these yeasts has been complicated because they require specific growth media and grow very slowly in laboratory culture.

Malassezia were originally identified by the French scientist Louis-Charles Malassez in the late 19th century. Raymond Sabouraud identified a dandruff-causing organism in 1904 and called it "Pityrosporum malassez", honoring Malassez, but at the species level as opposed to the genus level. When it was determined that the organisms were the same, the term "Malassezia" was judged to possess priority.[2]

In the mid-20th century, it was reclassified into two species:

  • Pityrosporum (Malassezia) ovale, which is lipid-dependent and found only on humans. P. ovale was later divided into two species, P. ovale and P. orbiculare, but current sources consider these terms to refer to a single species of fungus, with M. furfur the preferred name.[3]
  • Pityrosporum (Malassezia) pachydermatis, which is lipophilic but not lipid-dependent. It is found on the skin of most animals.

In the mid-1990s, scientists at the Pasteur Institute in Paris, France, discovered additional species.[4]

Currently there are at least 17 recognized species:[citation needed]

...

Malassezia restricta

M restricta is a commonly met fungus that naturally colonizes the skin of many animals including humans, grows both anaerobically and aerobically. It requires long chain fatty acids for growth.[17] Originally commensal it's been associated with Crohn's Disease and implicated in exacerbating colitis in gnotobiotic mice.[18][19] [20]

Role in human diseases

Dermatitis and dandruff

Identification of Malassezia on skin has been aided by the application of molecular or DNA-based techniques. These investigations show that the Malassezia species causing most skin disease in humans, including the most common cause of dandruff and seborrhoeic dermatitis, is M. globosa (though M. restricta is also involved).[8] The skin rash of tinea versicolor (pityriasis versicolor) is also due to infection by this fungus.

As the fungus requires fat to grow,[4] it is most common in areas with many sebaceous glands: on the scalp,[21] face, and upper part of the body. When the fungus grows too rapidly, the natural renewal of cells is disturbed, and dandruff appears with itching (a similar process may also occur with other fungi or bacteria so differential diagnosis should be made).

A project in 2007 has sequenced the genome of dandruff-causing Malassezia globosa and found it to have 4,285 genes.[22][23] M. globosa uses eight different types of lipase, along with three phospholipases, to break down the oils on the scalp. Any of these 11 proteins would be a suitable target for dandruff medications.

The number of specimens of M. globosa on a human head can be up to ten million.[21]

M. globosa has been predicted to have the ability to reproduce sexually,[24] but this has not been observed.

Pancreas cancer

At least one study implicated M. globosa fungus in promoting growth of Pancreatic Ductal Adenocarcinoma (PDA) (exocrine cancer) as a result of it migrating from the gut lumen to the pancreas, both in human and mice.[25][26] The animal study showed that ablation (removal by using anti-fungal Amphotericin-B and Fluconazole) of Malassezia-species-rich microbiota from experimental mice with faulty KRAS gene was protective against tumor growth in both slowly progressive and invasive models of PDA, and repopulation of the control group (of mice) with a Malassezia spp. (this time excluding species of Candida, Saccharomyces or Aspergillus genera which were used along with the former in prior stage for control purposes) - accelerated oncogenesis.[27][26]

Treatment of symptomatic scalp infections

Further information: Seborrhoeic dermatitis § Treatments

Symptomatic scalp infections are often treated with shampoos containing selenium disulfide,[28] zinc pyrithione, or ketoconazole.

There are several natural antifungal remedies for seborrhoeic dermatitis including garlic, onions, coconut oil, apple cider vinegar, tea tree oil (Melaleuca alternifolia oil), honey, and cinnamic acid.[29][30][31] The efficacy of these natural treatments varies considerably among individuals.[citation needed]

References

  1. ^ Ran Yuping (2016). "Observation of Fungi, Bacteria, and Parasites in Clinical Skin Samples Using Scanning Electron Microscopy". In Janecek, Milos; Kral, Robert (eds.). Modern Electron Microscopy in Physical and Life Sciences. InTech. doi:10.5772/61850. ISBN 978-953-51-2252-4.
  2. ^ Inamadar AC, Palit A (2003). "The genus Malassezia and human disease". Indian J Dermatol Venereol Leprol. 69 (4): 265–70. PMID 17642908.
  3. ^ Freedberg; et al., eds. (2003). Fitzpatrick's Dermatology in General Medicine (6th ed.). McGraw-Hill. p. 1187. ISBN 0-07-138067-1.
  4. ^ a b Guého E, Midgley G, Guillot J (May 1996). "The genus Malassezia with description of four new species". Antonie van Leeuwenhoek. 69 (4): 337–55. doi:10.1007/BF00399623. PMID 8836432. S2CID 31791799.
  5. ^ a b Cabañes, FJ, Theelen, B, Castella, G, Boukhout, T (2007). "Two new lipid-dependent Malassezia species from domestic animals". FEMS Yeast Research. 7 (6): 1064–1076. doi:10.1111/j.1567-1364.2007.00217.x. ISSN 1567-1356. PMID 17367513.
  6. ^ Cabañes FJ, Vega S, Castellá G (2011). "Malassezia cuniculi sp. nov., a novel yeast species isolated from rabbit skin". Medical Mycology. 49 (1): 40–48. doi:10.3109/13693786.2010.493562. PMID 20560865.
  7. ^ Sugita T, Takashima M, Shinoda T, et al. (April 2002). "New Yeast Species, Malassezia dermatis, Isolated from Patients with Atopic Dermatitis". J. Clin. Microbiol. 40 (4): 1363–7. doi:10.1128/JCM.40.4.1363-1367.2002. PMC 140359. PMID 11923357.
  8. ^ a b DeAngelis YM, Saunders CW, Johnstone KR, et al. (September 2007). "Isolation and expression of a Malassezia globosa lipase gene, LIP1". J. Invest. Dermatol. 127 (9): 2138–46. doi:10.1038/sj.jid.5700844. PMID 17460728.
  9. ^ Sugita, Takashi; Masako Takashima; Minako Kodama; Ryoji Tsuboi; Akemi Nishikawa (October 2003). "Description of a New Yeast Species, Malassezia japonica, and Its Detection in Patients with Atopic Dermatitis and Healthy Subjects". J. Clin. Microbiol. 41 (10): 4695–4699. doi:10.1128/JCM.41.10.4695-4699.2003. PMC 254348. PMID 14532205.
  10. ^ Hirai A, Kano R, Makimura K, et al. (March 2004). "Malassezia nana sp. nov., a novel lipid-dependent yeast species isolated from animals". Int. J. Syst. Evol. Microbiol. 54 (Pt 2): 623–7. doi:10.1099/ijs.0.02776-0. PMID 15023986.
  11. ^ Coutinho SD, Paula CR (June 1998). "Biotyping of Malassezia pachydermatis strains using the killer system". Rev Iberoam Micol. 15 (2): 85–7. PMID 17655416.
  12. ^ Sugita T, Tajima M, Amaya M, Tsuboi R, Nishikawa A (2004). "Genotype analysis of Malassezia restricta as the major cutaneous flora in patients with atopic dermatitis and healthy subjects". Microbiol. Immunol. 48 (10): 755–9. doi:10.1111/j.1348-0421.2004.tb03601.x. PMID 15502408.
  13. ^ Uzal FA, Paulson D, Eigenheer AL, Walker RL (October 2007). "Malassezia slooffiae-associated dermatitis in a goat". Vet. Dermatol. 18 (5): 348–52. doi:10.1111/j.1365-3164.2007.00606.x. PMID 17845623.
  14. ^ Niamba P, Weill FX, Sarlangue J, Labrèze C, Couprie B, Taïeh A (August 1998). "Is common neonatal cephalic pustulosis (neonatal acne) triggered by Malassezia sympodialis?". Arch Dermatol. 134 (8): 995–8. doi:10.1001/archderm.134.8.995. PMID 9722730.
  15. ^ Sugita T, Tajima M, Takashima M, et al. (2004). "A new yeast, Malassezia yamatoensis, isolated from a patient with seborrheic dermatitis, and its distribution in patients and healthy subjects". Microbiol. Immunol. 48 (8): 579–83. doi:10.1111/j.1348-0421.2004.tb03554.x. PMID 15322337. S2CID 34281815.
  16. ^ Lorch JM, Palmer JM, Vanderwolf KJ, et al. (2018). "Malassezia vespertilionis sp. nov. :a new cold-tolerant species of yeast isolated from bats". Persoonia. 41: 56–70. doi:10.3767/persoonia.2018.41.04. PMC 6344816. PMID 30728599.
  17. ^ Limon, Jose J.; Tang, Jie; Li, Dalin; Wolf, Andrea J.; Michelsen, Kathrin S.; Funari, Vince; Gargus, Matthew; Nguyen, Christopher; Sharma, Purnima; Maymi, Viviana I.; Iliev, Iliyan D. (2019-03-13). "Malassezia Is Associated with Crohn's Disease and Exacerbates Colitis in Mouse Models". Cell Host & Microbe. 25 (3): 377–388.e6. doi:10.1016/j.chom.2019.01.007. ISSN 1931-3128. PMID 30850233.
  18. ^ Wu, Xiaoyan; Xia, Yaoyao; He, Fang; Zhu, Congrui; Ren, Wenkai (2021-03-14). "Intestinal mycobiota in health and diseases: from a disrupted equilibrium to clinical opportunities". Microbiome. 9 (1): 60. doi:10.1186/s40168-021-01024-x. ISSN 2049-2618. PMC 7958491. PMID 33715629.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  19. ^ "A fungus usually found on skin might play a role in Crohn's disease". ScienceDaily. Retrieved 2021-03-23.
  20. ^ Limon, Jose J.; Tang, Jie; Li, Dalin; Wolf, Andrea J.; Michelsen, Kathrin S.; Funari, Vince; Gargus, Matthew; Nguyen, Christopher; Sharma, Purnima; Maymi, Viviana I.; Iliev, Iliyan D. (2019-03-13). "Malassezia Is Associated with Crohn's Disease and Exacerbates Colitis in Mouse Models". Cell Host & Microbe. 25 (3): 377–388.e6. doi:10.1016/j.chom.2019.01.007. ISSN 1934-6069. PMC 6417942. PMID 30850233.
  21. ^ a b "Genetic code of dandruff cracked". BBC News. 6 November 2007. Retrieved 2008-12-10.
  22. ^ Xu J, Saunders CW, Hu P, et al. (November 2007). "Dandruff-associated Malassezia genomes reveal convergent and divergent virulence traits shared with plant and human fungal pathogens". Proc. Natl. Acad. Sci. U.S.A. 104 (47): 18730–5. Bibcode:2007PNAS..10418730X. doi:10.1073/pnas.0706756104. PMC 2141845. PMID 18000048.
  23. ^ "Scientists Complete Genome Sequence Of Fungus Responsible For Dandruff, Skin Disorders". ScienceDaily. Retrieved 2021-03-22.
  24. ^ Guillot J, Hadina S, Guého E (June 2008). "The genus Malassezia: old facts and new concepts". Parassitologia. 50 (1–2): 77–9. PMID 18693563.
  25. ^ Aykut, Berk; Pushalkar, Smruti; Chen, Ruonan; Li, Qianhao; Abengozar, Raquel; Kim, Jacqueline I.; Shadaloey, Sorin A.; Wu, Dongling; Preiss, Pamela; Verma, Narendra; Guo, Yuqi; Saxena, Anjana; Vardhan, Mridula; Diskin, Brian; Wang, Wei; Leinwand, Joshua; Kurz, Emma; Kochen Rossi, Juan A.; Hundeyin, Mautin; Zambrinis, Constantinos; Li, Xin; Saxena, Deepak; Miller, George (October 2019). "The fungal mycobiome promotes pancreatic oncogenesis via activation of MBL". Nature. 574 (7777): 264–267. Bibcode:2019Natur.574..264A. doi:10.1038/s41586-019-1608-2. PMC 6858566. PMID 31578522. {{cite journal}}: |archive-date= requires |archive-url= (help); |archive-url= requires |url= (help)
  26. ^ a b "Fungal invasion of pancreas creates cancer risk". ScienceDaily. Retrieved 2021-03-19.
  27. ^ Aykut, Berk; Pushalkar, Smruti; Chen, Ruonan; Li, Qianhao; Abengozar, Raquel; Kim, Jacqueline I.; Shadaloey, Sorin A.; Wu, Dongling; Preiss, Pamela; Verma, Narendra; Guo, Yuqi (2019-10-01). "The Fungal Mycobiome Promotes Pancreatic Oncogenesis via MBL Activation". Nature. 574 (7777): 264–267. doi:10.1038/s41586-019-1608-2. ISSN 0028-0836. PMC 6858566. PMID 31578522. To confirm that fungal dysbiosis accelerates PDA, we repopulated Amphotericin B-treated mice with Malassezia globosa, which is at increased abundance in mouse and human PDA
  28. ^ DermNet treatments/selenium Retrieved Dec 24, 2007..
  29. ^ Gupta, Aditya K; Nicol, Karyn; Batra, Roma (2004). "Role of Antifungal Agents in the Treatment of Seborrheic Dermatitis". American Journal of Clinical Dermatology. 5 (6): 417–422. doi:10.2165/00128071-200405060-00006. PMID 15663338. S2CID 23930182.
  30. ^ Al-Waili, N. S. (2001). "Therapeutic and prophylactic effects of crude honey on chronic seborrheic dermatitis and dandruff". European Journal of Medical Research. 6 (7): 306–8. PMID 11485891.
  31. ^ Shams-Ghahfarokhi, Masoomeh; Shokoohamiri, Mohammad-Reza; Amirrajab, Nasrin; Moghadasi, Behnaz; Ghajari, Ali; Zeini, Farideh; Sadeghi, Golnar; Razzaghi-Abyaneh, Mehdi (June 2006). "In vitro antifungal activities of Allium cepa, Allium sativum and ketoconazole against some pathogenic yeasts and dermatophytes". Fitoterapia. 77 (4): 321–323. doi:10.1016/j.fitote.2006.03.014. PMID 16690223.
Retrieved from "https://en.wikipedia.org/w/index.php?title=Malassezia&oldid=1013860554"