Correlation between genetic variability and virulence factors in clinical strains of Malassezia pachydermatis of animal origin.
Malassezia pachydermatis is a yeast belonging to the microbiota of the skin and mucous membranes of dog and cat, but it can also act as pathogen, causing dermatitis. The aim of this work was to evaluate the genetic variability of M. pachydermatis strains isolated from symptomatic dogs and cats and determine a correlation between genotype and phenotype. For this purpose eleven strains of M. pachydermatis were molecularly classified by nested-polymerase chain reaction (nested-PCR) based on ITS-1 and ITS-2 regions, specific for fungal rRNA genes. Furthermore, random amplification of polymorphic DNA (RAPD) was applied for genetic typing of M. pachydermatis isolates identifying four different genotypes. Strains belonging to genotype 1 produced the highest amount of biofilm and phospholipase activity. The inflammatory response induced by M. pachydermatis strains in immortalized human keratinocytes (HaCat cells) was significantly different when we compared the results obtained from each strain. In particular, HaCat cells infected with the strains belonging to genotypes 1 and 2 triggered the highest levels of increase in TLR-2, IL-1β, IL-6, IL-8, COX-2 and MMP-9 expression. By contrast, cells infected with the strains of genotype 3 and those of genotype 4 did not significantly induce TLR-2 and cytokines. The results obtained might suggest a possible association between genotype and virulence factors expressed by M. pachydermatis strains. This highlights the need for a more accurate identification of the yeast to improve the therapeutic approach and to monitor the onset of human infections caused by this emergent zoonotic pathogen.
Department of Experimental Medicine, Second University of Naples, Italy.
Elisabetta
E
Buommino
Department of Veterinary Medicine and Animal Production, University of Naples "Federico II", Naples, Italy.
Francesca Paola
FP
Nocera
Department of Experimental Medicine, Second University of Naples, Italy.
Annamaria
A
Parisi
Department of Experimental Medicine, Second University of Naples, Italy.
Antonietta
A
Rizzo
Department of Experimental Medicine, Second University of Naples, Italy.
Giovanna
G
Donnarumma
Department of Veterinary Medicine and Animal Production, University of Naples "Federico II", Naples, Italy.
Karina
K
Mallardo
Department of Veterinary Medicine and Animal Production, University of Naples "Federico II", Naples, Italy.
Filomena
F
Fiorito
Department of Dermatology and Venereology, Second University of Naples, Italy.
Adone
A
Baroni
Department of Veterinary Medicine and Animal Production, University of Naples "Federico II", Naples, Italy.
Luisa
L
De Martino
D000818:Animals; D002371:Cat Diseases / Q000382:microbiology*; D002415:Cats; D004271:DNA, Fungal / Q000235:genetics; D003881:Dermatomycoses / Q000382:microbiology / Q000662:veterinary*; D004283:Dog Diseases / Q000382:microbiology*; D004285:Dogs; D015966:Gene Expression Regulation, Fungal; D014644:Genetic Variation; D005838:Genotype; D008290:Malassezia / Q000235:genetics* / Q000378:metabolism*; D037521:Virulence Factors / Q000235:genetics / Q000378:metabolism*
D004271:DNA, Fungal; D037521:Virulence Factors
Biofilm; Inflammatory response; Malassezia pachydermatis; Phospholipase