The Pityrosporum Ovale

Martin‐Scott, Ian

doi:10.1111/j.1365-2133.1952.tb15805.x

Cited by 44 publications

(4 citation statements)

References 26 publications

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“…The varying results of the Gram stain suggest a variable composition. High amounts of carbohydrates were found chemically [26] and represented the main portion of an antigen preparation of the microorganism [45]. A newly developed polyclonal, monospecific Malassesia &$r-antibody, however, mainly reacts with proteins, the antigens are of 72 KD and 58 KD [46].…”

Section: Discussionmentioning

confidence: 99%

Fine structural investigation of Malassezia furfur. II. The envelope of the yeast cells

Mittag

1995

Mycoses

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The general ultrastructure of the Malassezia furfur cell envelope is shown in a schematic model. Distinct layers such as the outer lamella, the cell wall and the plasma membrane and special structural elements of the cell wall are described and presented in electronmicrographs. Special attention was paid to the outer lamellar layer that seems to be equivalent to a capsule. It probably contains lipids as well as the cell wall, and it seems to participate in attachment processes.

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Section: Discussionmentioning

confidence: 99%

Fine structural investigation of Malassezia furfur. II. The envelope of the yeast cells

Mittag

1995

Mycoses

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“…In several early papers there was debate about whether Malassezia was really able to cause disease (273,369). It is now thought, however, that it is the etiological agent of both cutaneous and systemic diseases.…”

Section: Diseases Associated With Malasseziamentioning

confidence: 99%

Immunology of Diseases Associated withMalasseziaSpecies

2002

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SUMMARY Malassezia species are members of the human cutaneous commensal flora, in addition to causing a wide range of cutaneous and systemic diseases in suitably predisposed individuals. Studies examining cellular and humoral immune responses specific to Malassezia species in patients with Malassezia-associated diseases and healthy controls have generally been unable to define significant differences in their immune response. The use of varied antigenic preparations and strains from different Malassezia classifications may partly be responsible for this, although these problems can now be overcome by using techniques based on recent work defining some important antigens and also a new taxonomy for the genus. The finding that the genus Malassezia is immunomodulatory is important in understanding its ability to cause disease. Stimulation of the reticuloendothelial system and activation of the complement cascade contrasts with its ability to suppress cytokine release and downregulate phagocytic uptake and killing. The lipid-rich layer around the yeast appears to be pivotal in this alteration of phenotype. Defining the nonspecific immune response to Malassezia species and the way in which the organisms modulate it may well be the key to understanding how Malassezia species can exist as both commensals and pathogens.

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“…On the basis of data available for nutrition and culture media of Pityrosporum (2,3,5,6,13,15,17,19,20,22), we designed culture media which enabled lux-uriant growth of each species of Pityrosporum, and also selective and differential media by the addition of appropriate selective agents.…”

mentioning

confidence: 99%

Selective and Differential Media for Isolation and Tentative Identification of Each Species of Pityrosporum Residing on Normal or Diseased Human Skin

Ushijima

Takahashi

Ozaki

1981

Microbiology and Immunology

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Selective and differential media were designed for each species of Pityrosporum ; P. pachydermatis, P. ouale, and P. orbiculare in order to make feasible a quantitative cultivation.Medium for P. pachydermatis (medium A) was composed of 1% trypticase peptone (BBL), 0.5% yeast extract (BBL), 0.3% glucose, 0.2% NaCl, 1.2% KH2 P04 (anhydrous), 1.5% agar, 0.01% ampicillin, and 0.025% cycloheximide with a pH of 5.5. Medium for P. ouale (medium B) was medium A supplemented with 0.05% sodium acetate (anhydrous), 0.2% Tween 80, and 0.025% (selective medium) or 0.075% (differential medium) sodium laurate. Medium for P. orbiculare was medium B (devoid of laurate) supplemented with 2% olive oil, 0.25% glycerol, 0.25% gall powder, 0.05% sodium palmitate, 0.05% sodium stearate, 0.05% sodium oleate and 8% (selective medium) or 10% (differential medium) sodium lactate and an increase in Tween to 1%.For isolation of Pityrosporum, specimens were suspended in 0.1% Tween 80 solution and inoculated onto agar plates of three selective media. The plates were incubated aerobically at 37 C for 8-10 days under conditions of prevention of water loss from the media. The plating efficiency of each selective medium, expressed as a ratio of cultural counts to microscopic counts was generally over 70%. Species of Pityrosporum could also be identified when we inoculated the cell suspension onto differential agar plates and incubated the preparations at 37 C for 7 days.

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The Pityrosporum Ovale

Cited by 44 publications

References 26 publications

Fine structural investigation of Malassezia furfur. II. The envelope of the yeast cells

Fine structural investigation of Malassezia furfur. II. The envelope of the yeast cells

Immunology of Diseases Associated withMalasseziaSpecies

Selective and Differential Media for Isolation and Tentative Identification of Each Species of Pityrosporum Residing on Normal or Diseased Human Skin

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