Integrated Skin Microbiome-Metabolome Analysis Reveals Altered Bacterial Community Composition and Metabolites in Psoriasis

Objective:Current theories highlight the role of the microbiome in the pathogenesis of psoriasis.Additionally,abnormal metabolism can alter disease processes in terms of occurrence,progression,and prognosis.Therefore,an integrative microbiome and metabolome analysis of the skin may aid in understanding the disease pathogenesis and identify therapeutic targets for psoriasis.Methods:We recruited 22 patients with psoriasis and 22 age-and sex-matched healthy controls.Skin swabs were collected from the participants’scalps.All samples underwent amplicon sequencing of the internal transcribed spacer 1 and V3V416S rRNA regions and metabolome analysis.For amplicon data,analysis of the alpha diversities,microbial community structures and principal coordinate analysis were performed.Differential metabolites and pathway enrichment were analyzed for metabolome data.Studentt test and Wilcoxon rank sum test were used for statistical analysis.Results:The psoriatic lesions were characterized by higher bacterial diversity,significantly higher abundances ofCorynebacterium(P<0.001)andStaphylococcus(P=0.012),and a lower abundance ofCutibacterium(P<0.001)compared with healthy controls.However,no significant alterations in the fungal diversity or fungal taxonomies were detected.Metabolome analysis revealed that prostaglandin-related metabolites,nucleotides,and cysteine-and methionine-related metabolites were significantly enriched in patients with psoriasis,and these metabolites were positively correlated with the disease-associated bacteriaStaphylococcus andCorynebacterium.Conclusions:We demonstrated significant alterations in the skin microbiome and metabolome in patients with psoriasis compared with healthy controls.

Skin Microbiome： An Actor in the Pathogenesis of Psoriasis

INTRODUCTION Psoriasis is characterized by raised, scaly, well-demarcated, erythematous oval plaques. Although studies have revealed that disruption of immune tolerance and excessive production of inflammatory factors play important roles in the pathogenesis of psoriasis, the exact mechanism is still not clear Previous studies have shown that the concordance rate of monozygotic twins with psoriasis is greater than that of dizygotic twins, with genetic thctors underpinning 66-90% of the variation in risk of developing psoriasis.

Skin Microbiome,Metabolome and Skin Phenome,from the Perspectives of Skin as an Ecosystem

Skin is a complex ecosystem colonized by millions of microorganisms,including bacteria,fungi,and viruses.Skin microbiota is believed to exert critical functions in maintaining host skin health.Profiling the structure of skin microbial community is the first step to overview the ecosystem.However,the community composition is highly individualized and extremely complex.To explore the fundamental factors driving the complexity of the ecosystem,namely the selection pressures,we review the present studies on skin microbiome from the perspectives of ecology.This review summarizes the following:(1)the composition of substances/nutrients in the cutaneous ecological environment that are derived from the host and the environment,highlighting their proposed function on skin microbiota;(2)the features of dominant skin commensals to occupy ecological niches,through self-adaptation and microbe–microbe interactions;(3)how skin microbes,by their structures or bioactive molecules,reshape host skin phenotypes,including skin immunity,maintenance of skin physiology such as pH and hydration,ultraviolet(UV)protection,odor production,and wound healing.This review aims to re-examine the host–microbe interactions from the ecological perspectives and hopefully to give new inspiration to this field.

Effects of full replacement of dietary fishmeal with insect meal from Tenebrio molitor on rainbow trout gut and skin microbiota

Background:Aquaculture must continue to reduce dependence on fishmeal(FM)and fishoil in feeds to ensure sustainable sector growth.Therefore,the use of novel aquaculture feed ingredients is growing.In this regard,insects can represent a new world of sustainable and protein-rich ingredients for farmed fish feeds.Accordingly,we investigated the effects of full replacement of FM with Tenebrio molitor(TM)larvae meal in the diet of rainbow trout(Oncorhynchus mykiss)on fish gut and skin microbiota.Methods:A feeding trial was conducted with 126 trout of about 80 g mean initial weight that were fed for 22 weeks with two isonitrogenous,isolipidic,and isoenergetic extruded experimental diets.Partially defatted TM meal was included in one of the diets to replace 100%(TM 100)of FM,whereas the other diet(TM 0)was without TM.To analyse the microbial communities,the Illumina MiSeq platform for sequencing of 16S rRNA gene and Qiime pipeline were used to identify bacteria in the gut and skin mucosa,and in the diets.Results:The data showed no major effects of full FM substitution with TM meal on bacterial species richness and diversity in both,gut mucosa-and skin mucus-associated microbiome.Skin microbiome was dominated by phylum Proteobacteria and especially by Gammaproteobacteria class that constituted approximately half of the bacterial taxa found.The two dietary fish groups did not display distinctive features,except for a decrease in the relative abundance of Deefgea genus(family Neisseriaceae)in trout fed with insect meal.The metagenomic analysis of the gut mucosa indicated that Tenericutes was the most abundant phylum,regardless of the diet.Specifically,within this phylum,the Mollicutes,mainly represented by Mycoplasmataceae family,were the dominant class.However,we observed only a weak dietary modulation of intestinal bacterial communities.The only changes due to full FM replacement with TM meal were a decreased number of Proteobacteria and a reduced number of taxa assigned to Ruminococcaceae and Neisseriaceae families.Conclusions:The data demonstrated that TM larvae meal is a valid alternative animal protein to replace FM in the aquafeeds.Only slight gut and skin microbiota changes occurred in rainbow trout after total FM replacement with insect meal.The mapping of the trout skin microbiota represents a novel contribution of the present study.Indeed,in contrast to the increasing knowledge on gut microbiota,the skin microbiota of major farmed fish species remains largely unmapped but it deserves thorough consideration.

The Prebiotic Effect of Triple Biotic Technology on Skin Health

Objective: Pre-, pro- and postbiotics are becoming more prevalent as ingredients in cosmetic and personal care products. A novel triple biotic technology has been developed and investigated for its impact on skin flora and skin barrier properties. Methods: Growth inhibition/promotion assay was performed to determine the effect on skin bacteria growth, using Escherichia coli, Corynebacterium striatum, Staphylococcus aureus, and Staphylococcus epidermidis. A skin penetration assay and skin barrier biomarker measurements were performed using an ex vivo human skin explant model. The triple-biotic complex of inulin, 2-butyloctanol, and a biomimic blend of postbiotics was tested individually as well as part of cosmetic formulations. Results: The triple-biotic technology, either as individual components or in a cosmetic formulation, inhibited the growth of undesirable bacteria, in most cases. On the other hand, the growth of desirable bacteria was either promoted or maintained. The cosmetic formulations with the triple-biotic technology demonstrated an enhanced skin barrier and an increase in skin barrier biomarkers. Conclusion: A novel triple-biotic technology has been developed and shown to deliver a strong prebiotic effect with demonstrable benefits on bacterial growth, skin barrier properties, and the production of skin barrier biomarkers. This study indicates that triple-biotic technology can be used as a desirable prebiotic ingredient in personal care products to provide skin health benefits.

Fermented Lysate of Lactiplantibacillus Isolated From Green Tea Leaves Protects Keratinocytes Against Stress Hormone and Staphylococcus Aureus

Psychological stress can impair epidermal barrier function by inhibiting the proliferation and differentiation of keratinocytes.In this study,the effect of stress hormone on skin microorganisms was confirmed through an in vitro experiment.Cortisol,a typical stress hormone,inhibited the growth of skin microbes,especially Staphylococcus epidermidis,which is a commensal skin microbe.And cortisol enhanced the adhesion of the pathogenic bacterium Staphylococcus aureus to keratinocytes.The fermented lysate of Lactiplantibacillus isolated from green tea leaves(LFL)affected the growth of skin microbes in the opposite manner to cortisol,and increased the expression of a keratinocyte differentiation marker that was suppressed by cortisol and S.aureus.Moreover,LFL inhibited the adhesion of S.aureus to keratinocytes.The modulating effect of LFL on the growth and adhesion of skin microbes was unaffected by the presence of cortisol.LFL also alleviated cell damage in reconstructed human epidermis caused by S.aureus.These results suggest that LFL may be useful as a cosmetic ingredient capable of controlling skin microbiome balance and protecting skin health against psychological stress.

Microbiome in the setting of burn patients:implications for infections and clinical outcomes

Burn damage can lead to a state of immune dysregulation that facilitates the development of infections in patients.The most deleterious impact of this dysfunction is the loss of the skin’s natural protective barrier.Furthermore,the risk of infection is exacerbated by protracted hospitalization,urinary catheters,endotracheal intubation,inhalation injury,arterial lines and central venous access,among other mainstays of burn care.Currently,infections comprise the leading cause of mortality after major burn injuries,which highlights the improvements observed over the last 50 years in the care provided to burn victims.The need to implement the empirical selection of antibiotic therapy to treat multidrug-resistant bacteria may concomitantly lead to an overall pervasiveness of difficult-to-treat pathogens in burn centres,as well as the propagation of antimicrobial resistance and the ultimate dysregulation of a healthy microbiome.While preliminary studies are examining the variability and evolution of human and mice microbiota,both during the early and late phase burn injury,one must consider that abnormal microbiome conditions could influence the systemic inflammatory response.A better understanding of the changes in the postburn microbiome might be useful to interpret the provenance and subsequent development of infections,as well as to come up with inferences on the prognosis of burn patients.This review aims to summarise the current findings describing the microbiological changes in different organs and systems of burn patients and how these alterations affect the risks of infections,complications,and,ultimately,healing.

Challenges and innovations in treating chronic and acute wound infections:from basic science to clinical practice

Acute and chronic wound infection has become a major worldwide healthcare burden leading to significantly high morbidity and mortality.The underlying mechanism of infections has been widely investigated by scientist,while standard wound management is routinely been used in general practice.However,strategies for the diagnosis and treatment of wound infections remain a great challenge due to the occurrence of biofilm colonization,delayed healing and drug resistance.In the present review,we summarize the common microorganisms found in acute and chronic wound infections and discuss the challenges from the aspects of clinical diagnosis,non-surgical methods and surgical methods.Moreover,we highlight emerging innovations in the development of antimicrobial peptides,phages,controlled drug delivery,wound dressing materials and herbal medicine,and find that sensitive diagnostics,combined treatment and skin microbiome regulation could be future directions in the treatment of wound infection.