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Do Malassezia species play a role in exacerbation of scalp psoriasis?

Clinical expression of psoriasis is in part dependent on external factors, such as drugs, microorganisms or stress. However convincing evidence of the role of Malassezia species in the pathogenesis of the psoriasis is still lacking. Samples taken from scalp skin of 40 psoriatic patients and the same...

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Published in:Journal de mycologie médicale 2014-06, Vol.24 (2), p.87-92
Main Authors: Gomez-Moyano, E., Crespo-Erchiga, V., Martínez-Pilar, L., Godoy Diaz, D., Martínez-García, S., Lova Navarro, M., Vera Casaño, A.
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description Clinical expression of psoriasis is in part dependent on external factors, such as drugs, microorganisms or stress. However convincing evidence of the role of Malassezia species in the pathogenesis of the psoriasis is still lacking. Samples taken from scalp skin of 40 psoriatic patients and the same number of healthy individuals were observed under direct microsocopic examination and cultured on modified Dixon agar. Direct microscopy examination of psoriatic scalp scales was positive in 30 (75%) patients; while it was positive in only 12 (30%) healthy subjects (P=0.003). Half of the cultures from healthy subjects showed no growth of colonies, but only 8 (15%) of psoriatic patients were negative. When an exacerbation has occurred in the previous weeks, pseudohyphaes were observed in 12 (40%) patients, Malassezia globosa was isolated in 18 (45%) patients and Malassezia restricta was isolated in 12 (30%) patients. In the group of patients having stable lesion, without any exacerbation in the previous weeks, no pseudohypahes were observed, M. globosa was not isolated, M. restricta was isolated in 4 (10%), and cultures were negative in 6 of them (15%). Malassezia species form an integral part of normal cutaneous microflora in humans, however we found that during the episodes of exacerbation of the disease the presence of these yeasts, and particularly M. globosa, was increased. L’expression clinique du psoriasis dépend partiellement de facteurs externes, comme les médicaments, certains microorganismes ou même le stress. Jusqu’à présent, le rôle des levures Malassezia dans la pathogenèse du psoriasis n’était pas bien établi. Des échantillons ont été obtenus par grattage de la peau du cuir chevelu chez 40 malades de psoriasis, ainsi que de 40 sujets témoins sains. Dans tous les cas, on a pratiqué un examen direct avec du KOH et des cultures sur milieu de Dixon modifié. L’examen direct des lésions de psoriasis a été positif chez 30 (75 %) des malades, n’étant positif que chez 12 (30 %) des sujets témoins (p=0,003). Jusqu’à la moitié des cultures des échantillons de sujets témoins restèrent négatives, n’étant négatives par contre que pour 8 (15 %) de celles des malades de psoriasis. Chez les malades ayant eu une poussée dans les semaines précédentes, on observait du pseudomycélium dans 12 (40 %) des cas, et on a isolé Malassezia globosa dans 18 (45 %) et Malassezia restricta dans 12 cas (30 %). Par contre, chez les malades ayant des lésions stables, n’ayant subi au
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However convincing evidence of the role of Malassezia species in the pathogenesis of the psoriasis is still lacking. Samples taken from scalp skin of 40 psoriatic patients and the same number of healthy individuals were observed under direct microsocopic examination and cultured on modified Dixon agar. Direct microscopy examination of psoriatic scalp scales was positive in 30 (75%) patients; while it was positive in only 12 (30%) healthy subjects (P=0.003). Half of the cultures from healthy subjects showed no growth of colonies, but only 8 (15%) of psoriatic patients were negative. When an exacerbation has occurred in the previous weeks, pseudohyphaes were observed in 12 (40%) patients, Malassezia globosa was isolated in 18 (45%) patients and Malassezia restricta was isolated in 12 (30%) patients. In the group of patients having stable lesion, without any exacerbation in the previous weeks, no pseudohypahes were observed, M. globosa was not isolated, M. restricta was isolated in 4 (10%), and cultures were negative in 6 of them (15%). Malassezia species form an integral part of normal cutaneous microflora in humans, however we found that during the episodes of exacerbation of the disease the presence of these yeasts, and particularly M. globosa, was increased. L’expression clinique du psoriasis dépend partiellement de facteurs externes, comme les médicaments, certains microorganismes ou même le stress. Jusqu’à présent, le rôle des levures Malassezia dans la pathogenèse du psoriasis n’était pas bien établi. Des échantillons ont été obtenus par grattage de la peau du cuir chevelu chez 40 malades de psoriasis, ainsi que de 40 sujets témoins sains. Dans tous les cas, on a pratiqué un examen direct avec du KOH et des cultures sur milieu de Dixon modifié. L’examen direct des lésions de psoriasis a été positif chez 30 (75 %) des malades, n’étant positif que chez 12 (30 %) des sujets témoins (p=0,003). Jusqu’à la moitié des cultures des échantillons de sujets témoins restèrent négatives, n’étant négatives par contre que pour 8 (15 %) de celles des malades de psoriasis. Chez les malades ayant eu une poussée dans les semaines précédentes, on observait du pseudomycélium dans 12 (40 %) des cas, et on a isolé Malassezia globosa dans 18 (45 %) et Malassezia restricta dans 12 cas (30 %). Par contre, chez les malades ayant des lésions stables, n’ayant subi aucune poussée, on n’a pas observé de pseudomycélium à l’examen, et on n’a pas isolé M. globosa, et seulement restricta dans 4 (10 %). Les cultures restèrent négatives dans 6 (15 %) de ces malades. Les levures Malassezia font partie de la microflore cutanée normale chez les humains. Dans certaines maladies cutanées elles peuvent jouer un rôle plus ou moins établi. 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Psychology ; Humans ; Infectious diseases ; Les maladies de la peau ; Malassezia ; Malassezia - physiology ; Male ; Medical sciences ; Microbiology ; Middle Aged ; Miscellaneous ; Mycology ; Mycoses ; Psoriasis ; Psoriasis - epidemiology ; Psoriasis - microbiology ; Psoriasis - pathology ; Scalp - microbiology ; Scalp - pathology ; Skin disease ; Young Adult</subject><ispartof>Journal de mycologie médicale, 2014-06, Vol.24 (2), p.87-92</ispartof><rights>2013 Elsevier Masson SAS</rights><rights>2015 INIST-CNRS</rights><rights>Copyright © 2013 Elsevier Masson SAS. 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However convincing evidence of the role of Malassezia species in the pathogenesis of the psoriasis is still lacking. Samples taken from scalp skin of 40 psoriatic patients and the same number of healthy individuals were observed under direct microsocopic examination and cultured on modified Dixon agar. Direct microscopy examination of psoriatic scalp scales was positive in 30 (75%) patients; while it was positive in only 12 (30%) healthy subjects (P=0.003). Half of the cultures from healthy subjects showed no growth of colonies, but only 8 (15%) of psoriatic patients were negative. When an exacerbation has occurred in the previous weeks, pseudohyphaes were observed in 12 (40%) patients, Malassezia globosa was isolated in 18 (45%) patients and Malassezia restricta was isolated in 12 (30%) patients. 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However convincing evidence of the role of Malassezia species in the pathogenesis of the psoriasis is still lacking. Samples taken from scalp skin of 40 psoriatic patients and the same number of healthy individuals were observed under direct microsocopic examination and cultured on modified Dixon agar. Direct microscopy examination of psoriatic scalp scales was positive in 30 (75%) patients; while it was positive in only 12 (30%) healthy subjects (P=0.003). Half of the cultures from healthy subjects showed no growth of colonies, but only 8 (15%) of psoriatic patients were negative. When an exacerbation has occurred in the previous weeks, pseudohyphaes were observed in 12 (40%) patients, Malassezia globosa was isolated in 18 (45%) patients and Malassezia restricta was isolated in 12 (30%) patients. In the group of patients having stable lesion, without any exacerbation in the previous weeks, no pseudohypahes were observed, M. globosa was not isolated, M. restricta was isolated in 4 (10%), and cultures were negative in 6 of them (15%). Malassezia species form an integral part of normal cutaneous microflora in humans, however we found that during the episodes of exacerbation of the disease the presence of these yeasts, and particularly M. globosa, was increased. L’expression clinique du psoriasis dépend partiellement de facteurs externes, comme les médicaments, certains microorganismes ou même le stress. Jusqu’à présent, le rôle des levures Malassezia dans la pathogenèse du psoriasis n’était pas bien établi. Des échantillons ont été obtenus par grattage de la peau du cuir chevelu chez 40 malades de psoriasis, ainsi que de 40 sujets témoins sains. Dans tous les cas, on a pratiqué un examen direct avec du KOH et des cultures sur milieu de Dixon modifié. L’examen direct des lésions de psoriasis a été positif chez 30 (75 %) des malades, n’étant positif que chez 12 (30 %) des sujets témoins (p=0,003). Jusqu’à la moitié des cultures des échantillons de sujets témoins restèrent négatives, n’étant négatives par contre que pour 8 (15 %) de celles des malades de psoriasis. Chez les malades ayant eu une poussée dans les semaines précédentes, on observait du pseudomycélium dans 12 (40 %) des cas, et on a isolé Malassezia globosa dans 18 (45 %) et Malassezia restricta dans 12 cas (30 %). Par contre, chez les malades ayant des lésions stables, n’ayant subi aucune poussée, on n’a pas observé de pseudomycélium à l’examen, et on n’a pas isolé M. globosa, et seulement restricta dans 4 (10 %). Les cultures restèrent négatives dans 6 (15 %) de ces malades. Les levures Malassezia font partie de la microflore cutanée normale chez les humains. Dans certaines maladies cutanées elles peuvent jouer un rôle plus ou moins établi. Dans le psoriasis du cuir chevelu, nous avons remarqué une augmentation de la présence de ces levures, et en particulier de M. globosa, en relation avec les poussées de la maladie.</abstract><cop>Paris</cop><pub>Elsevier Masson SAS</pub><pmid>24411177</pmid><doi>10.1016/j.mycmed.2013.10.007</doi><tpages>6</tpages><orcidid>https://orcid.org/0000-0003-0072-0764</orcidid></addata></record>
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ispartof Journal de mycologie médicale, 2014-06, Vol.24 (2), p.87-92
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subjects Adolescent
Adult
Aged
Biological and medical sciences
Dermatomycoses - complications
Dermatomycoses - epidemiology
Dermatomycoses - microbiology
Disease Progression
Détérioration
Exacerbations
Female
Fundamental and applied biological sciences. Psychology
Humans
Infectious diseases
Les maladies de la peau
Malassezia
Malassezia - physiology
Male
Medical sciences
Microbiology
Middle Aged
Miscellaneous
Mycology
Mycoses
Psoriasis
Psoriasis - epidemiology
Psoriasis - microbiology
Psoriasis - pathology
Scalp - microbiology
Scalp - pathology
Skin disease
Young Adult
title Do Malassezia species play a role in exacerbation of scalp psoriasis?
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