The expression of TNF-α and ICAM-1 in lesions of lichen planus and its implication

Causal association of the skin microbiome with human infertility: insights from a bidirectional two-sample Mendelian randomization

Infertility is a disorder characterized by the inability to achieve a clinical pregnancy after 12 months of regular and unprotected sexual activity. Affecting 8-12% of the global population, with the continuous progress of microbial research in recent years, a variety of microorganisms may be associated with the onset of infertility. We therefore used a two-sample MR Analysis to investigate the association between skin microbes and infertility. we used preprocessed exposure data to correlate infertility measures (infertility in women, associated with anovulation; Female infertility, cervical infertility, vaginal infertility, other infertility or unknown causes; Female infertility, fallopian tube origin; ED; Based on this, the positive results were subjected to horizontal pleiotropy analysis and heterogeneity analysis. Finally, Steiger test was performed to confirm the absence of reverse causality. The data used in this study were obtained from the published GWAS data sets. skin microbiota from the study conducted by Moitinho-Silva et al., and the exposure from the Finn. In this study, we found a positive causal association between Lactobacillales, Clostridiales, Pseudomonadales, and Moraxellaceae and female infertility and anovulation by MR Analysis of two samples. Enhydrobacter, Betaproteobacteria have a negative causal association with female infertility and anovulation. Lactobacillales and Alphaproteobacteria had positive causal association with female infertility, cervical infertility, vaginal infertility, other infertility or unknown causes. There was a negative causal association between Haemophilus and female infertility, cervical infertility, vaginal infertility, other infertility or unknown causes. Alphaproteobacteria are positively correlated with female infertility and fallopian tube origin. Bacteroidetes is negatively correlated with female infertility and fallopian tube origin. Rhodobacteraceae, Clostridiales and Flavobacteriaceae had a negative causal association with male infertility. Corynebacterium had a positive causal association with ED, and Micrococcus had a negative causal association with ED. Our study reveals a causal association between skin microbiota and infertility, and provides a theoretical basis for the inclusion of skin microbiota in the prevention and treatment of infertility. To the best of our knowledge, our study is the first MR Analysis to explore the potential causal association between skin microbiota and infertility. On this basis, we make a reasonable hypothesis that skin microbes cause infertility, and propose possible mechanisms. Our research contributes to the prevention and treatment of clinical infertility.

The role of skin microbiota in lichen planus from a Mendelian randomization perspective

Lichen planus is a chronic skin lesion characterized by pruritic violaceous papules, which has a high risk of morbidity. Skin microbiota plays an important role in the maintenance of cutaneous mucosal barrier and human health and immune homeostasis. Studies have shown that skin microbiota may play a role in the pathogenesis of lichen planus, but it is not yet clear. MR studies have been performed to determine causal associations. Lichen planus samples from Finn database were extracted from published GWAS data, including 6,411 cases and 405,770 controls; skin microbiota samples were gathered from a meta-analysis of German population-based GWAS, which included 1,656 skin samples from two cohorts: KORA FF4 (n = 353) and PopGen (n = 294), comprising 4,685,714 SNPs. The IVW method was used as the main statistical method, supplemented by three methods: MR-Egger, weighted median and weighted mode. FDR correction and MR Steiger test were used to reduce false positives. IVW method revealed a negative correlation between Burkholderia in the moist anterior elbow and lichen planus (OR: 0.934, 95% CI: 0.910-0.986, P = 0.017). These associations remained stable following false discovery rate correction (P < 1e-5). Our study highlights a possible causal role of Burkholderia in the development of lichen planus and suggests that Burkholderia may reduce the occurrence of lichen planus by affecting macrophages.

Demystifying Esophageal Lichen Planus: A Comprehensive Review of a Rare Disease You Will See in Practice

Lichen planus (LP) is a chronic inflammatory disorder that often affects the skin, hair, nails, and mucus membranes. Although esophageal involvement has traditionally been felt to be rare, recent reports suggest that it is often unrecognized or misdiagnosed. The diagnoses of esophageal lichen planus can be challenging and is suspected based on patients' endoscopic and histologic findings and in the context of their clinical history and physical examination. Physicians must have an index of suspicion, particularly in older white women and in those patients with an atypical esophagitis or stricturing disease, which do not respond to traditional treatment. Currently, there are limited data on esophageal lichen planus patients, and no formal management guidelines for this disease, which all gastroenterologists will see in practice. This article reviews the etiology and histopathology of LP and provides a comprehensive discussion of the clinical features, diagnosis, and management of esophageal disease from the gastroenterologist's perspective. Finally, we address the esophageal complications of LP.

Lichen Planus

Lichen planus (LP) is a T cell-mediated disease affecting the stratified squamous epithelia of the skin and/or mucus membrane. Histologically, the disease is characterized by a lichenoid inflammatory infiltrate and vacuolar degeneration of the basal layer of the epidermis. LP has three major subtypes: Cutaneous, mucosal and appendageal LP. Rarely, it may affect the nails in the absence of skin and/or mucosal changes. LP may also be induced by several drugs, typically anti-hypertensive medication or be associated with infections, particularly viral hepatitis. The diagnosis is based on the clinical presentation and characteristic histological findings. Although the disease is often self-limiting, the intractable pruritus and painful mucosal erosions result in significant morbidity. The current first-line treatment are topical and/or systemic corticosteroids. In addition, immunosuppressants may be used as corticosteroid-sparing agents. These, however are often not sufficient to control disease. Janus kinase inhibitors and biologics (anti-IL-12/23, anti-IL17) have emerged as novel future treatment options. Thus, one may expect a dramatic change of the treatment landscape of LP in the near future.

Lichen planus and lichenoid dermatoses: Clinical overview and molecular basis

Deriving from the Greek word λειχήν for "tree moss" and the Latin word planus for "planar," lichen planus is a relatively uncommon and heterogeneous cutaneous disorder that typically develops in middle-aged adults. Despite the significant clinical burden associated with the disorder, little well-conducted molecular research has been undertaken, possibly because of heterogeneity impeding consistent and confident phenotyping. The multiple variants of lichenoid disease bear overlapping clinical and pathologic features despite manifesting as distinct clinical disorders. The first article in this 2-part continuing medical education series provides a comprehensive overview of the clinical and pathologic characteristics of cutaneous lichenoid dermatoses and links these manifestations to recent advances in our understanding of the underlying pathobiology of such diseases.

The Measurement of Serum Tumor Necrosis Factor-alpha Levels in Patients with Lichen Planus

Background:

Lichen planus is a common mucocutaneous inflammatory skin disease with a multifactorial etiology. Cytokines have a key role in its pathogenesis. In our study, we aimed to investigate the relationship between the disease severity and levels of the tumor necrosis factor alpha (TNF-α) cytokine which was considered as a primary cytokine that initiates the cytotoxicity.

Materials and Methods:

A total of 34 patients with lichen planus who were 18 year or older and gender-matched healthy controls were included in the study. Serum TNF-α levels were measured by human TNF-α enzyme-linked immunosorbent assay test kits and the values in the two groups were statistically compared.

Results:

The mean serum TNF-α levels were higher in the patient group than that in the control group. Serum TNF-α levels were not associated with oral mucosal involvement and gender. However, it was observed that the level of TNF-α was higher in older ages, both in patient and in control groups.

Conclusion:

It is thought that TNF-α, a proinflammatory cytokine, may have an important role in the pathogenesis of lichen planus.

The measurement of serum TNF-α levels in patients with lichen planus

BACKGROUND

Lichen planus is a common mucocutaneous inflammatory skin disease with a multifactorial etiology. Cytokines play a key role in lichen planus pathogenesis. This study investigates the relationship between disease severity and levels of tumor necrosis factor-α (TNF-α), which is considered a primary cytokine that initiates cytotoxicity.

MATERIAL AND METHODS

Serum TNF-α levels were compared between a patient group (n = 34) and a control group (n = 20). TNF-α serum levels were measured using human TNF-α Enzyme-Linked Immunosorbent Assay (ELISA) test kits, and the two groups were statistically compared to each other.

RESULTS

Mean serum TNF-α levels were found to be significantly higher in the patient group than in the control group (p < 0.005). However, no significant association was observed between TNF-α levels and oral mucosal involvement (p > 0.005). No relationship was detected between TNF-α levels and patients' sex.

CONCLUSION

It is thought that TNF-α, a proinflammatory cytokine, may play an important role in the pathogenesis of lichen planus. TNF-α may be a simple and effective predictor to illustrate the inflammatory status in patients with lichen planus.

Assessment of systemic inflammation with neutrophil-lymphocyte ratio in lichen planus

Introduction

Lichen planus (LP) is a papulosquamous eruption of the skin and mucous membranes. Although the exact pathogenesis of the disease remains unclear, it is believed that LP represents an inflammatory disorder. Neutrophil-lymphocyte (N/L) ratio is considered a systemic inflammatory marker that correlated with severity of the diseases.

Aim

To investigate whether N/L ratio increases in LP and may be an independent severity marker for LP lesions.

Material and methods

White blood cell (WBC), neutrophil and lymphocyte counts, N/L ratio, erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) were statistically compared between the patient (n = 55) and the control group (n = 48). The relationship of N/L ratio and the body surface area (BSA) was assessed.

Results

Erythrocyte sedimentation rate and CRP were statistically higher in patients with LP than in controls (p < 0.0001). Our analysis revealed a significantly higher level of N/L ratio in patients with LP compared with controls, respectively (2.5 ±1.1 (1.2–7.3) vs. 1.4 ±0.4 (0.8–2.7), p < 0.0001). Body surface area (p = 0.001), CRP (p = 0.006), and ESR (p = 0.003) were identified as possible predictors of N/L ratio, but only BSA (p = 0.002) and ESR (p = 0.003) were found as significant independent predictors in a multiple linear regression model.

Conclusions

The inflammatory process in LP was supported by our results. N/L ratio may have an impact to show the inflammatory status in patients with LP as an inexpensive, simple and effective predictor. It may be used for the severity and treatment option of LP. But, N/L ratio and LP relationship could be confirmed by other large prospective studies.

Anti-angiogenic therapy (bevacizumab) in the management of oral lichen planus

Oral lichen planus (OLP), a mucocutaneous chronic inflammatory disease, is conventionally managed using topical corticosteroid therapy. Given the fact that OLP is strongly linked to angiogenesis, anti-angiogenic drugs, such as bevacizumab, might be introduced as an alternative treatment for contraindicated, non-responsive patients. The aim of the present study was to report the short-term effectiveness and safety of intralesional bevacizumab injection in the management of atrophic/erosive OLP. A case series study was conducted in patients with atrophic/erosive OLP in the buccal mucosa, assigned to receive either 2.5 mg of bevacizumab, by intralesional injection (n = 20, test), or topical 0.1% triamcinolone acetonide ointment (n = 20, control). The size, score, and pain intensity of the lesions were assessed pre- and post-treatment. Tissue biopsies were collected for histopathologic, immunohistochemical, and ultrastructural examination. After 1 wk, the test group had significant reductions both in lesion seize and in pain scores compared with controls. A marked decrease in vascular endothelial growth factor (VEGF) and interleukin-8 immunoexpression was noted in tissue biopsies from bevacizumab-treated lesions compared with control lesions. Furthermore, ultrastructural examination of OLP tissue specimens revealed significant healing signs associated with bevacizumab treatment. Short-term data suggest that intralesional bevacizumab injection effectively and safely achieved resolution of atrophic/erosive OLP lesions without disease exacerbations during a 3-month follow-up period.

Degranulated mast cells and TNF-α in oral lichen planus and oral lichenoid reactions diseases

Background:

The objective of this study was to assess mast cells and TNF-α in oral lichen planus (OLP) and oral lichenoid reactions (OLR) patients as diagnostic marker to the differential diagnosis of OLP and OLR diseases.

Materials and Methods:

In this cross-sectional study, samples were obtained from 30 OLP and 30 OLR patients, between June 2010 and March 2011 in Dental clinic of the University of Isfahan, Iran. Mast cells in the reticular layer of the lamina propria for samples were evaluated using toluidine blue method and immunohistochemical technique. The clinical relevant data taken into account were: demographical data, total number and degranulated mast cells, ratio of degranulated mast cells and TNF-α positive degranulated mast cells.

Results:

In OLP and OLR, the total mast cells were 21.2 ± 7.9 and 20.3 ± 6.8, degranulated mast cells were 15.5 ± 6.9 and 19.2 ± 6.9, ratio of degranulated mast cells to total mast cells were 0.716 ± 0.067 and 0.946 ± 0.081, and TNF-α positive degranulated mast cells were 13.6 ± 6.3 and 17.1 ± 6.04, respectively. There was no significant difference for the total mast cells. But degranulated mast cells, ratio of degranulated mast cells and TNF-α positive degranulated mast cells in OLR were significantly higher than OLP patients.

Conclusions:

Our results showed that the degranulated mast cells, ratio of degranulated mast cells and TNF-α in OLR was significantly more than OLP patients and these may be able to be used as diagnostic markers to the differential diagnosis of OLP and OLR.

An open-label pilot study of apremilast for the treatment of moderate to severe lichen planus: a case series

BACKGROUND

Current treatments for chronic lichen planus (LP) are often ineffective and may have significant adverse side effects. An alternative safe and effective treatment for recalcitrant LP is needed.

OBJECTIVES

We sought to study the safety and efficacy of apremilast in the treatment of moderate to severe LP.

METHODS

Ten patients with biopsy-proven LP received 20 mg of apremilast orally twice daily for 12 weeks with 4 weeks of treatment-free follow-up. The primary efficacy end point was the proportion of patients achieving a 2-grade or more improvement in the Physician Global Assessment (PGA) after 12 weeks of treatment.

RESULTS

Three (30%) of the 10 patients achieved a 2-grade or more improvement in the PGA after 12 weeks of treatment; however, all patients demonstrated statistically significant clinical improvement with respect to secondary parameters between baseline and the end of treatment.

LIMITATIONS

It may be difficult to generalize the results of this study to a larger patient population with LP because of our small sample size and lack of a control group. In addition, a longer treatment period or higher dose may have been needed for therapeutic efficacy. The safety and efficacy of long-term apremilast therapy is currently unknown.

CONCLUSION

Apremilast may be efficacious in the treatment of LP, but double-blinded, controlled trials are necessary to thoroughly evaluate its safety and efficacy.

The prevalence of hepatitis C Virus (HCV) among lichen planus patients and its clinical pattern at the University of Abuja Teaching Hospital, Gwagwalada, Abuja, Nigeria

OBJECTIVE

The relationship between hepatitis C virus and Lichen Planus have been widely reported in the literature; although there are wide geographical variations in the reported prevalence of hepatitis C virus infection in patients with lichen planus. This study seeks to determine the prevalence of hepatitis C virus among lichen planus patients and its clinical morphological type in the University of Abuja Teaching Hospital, Gwagwalada Abuja, Nigeria.

MATERIALS/METHODS

This study was conducted between January 2010 and December, 2011 at the out patients Dermatological unit of the department of medicine at the University of Abuja Teaching Hospital Gwagwalada Abuja, Nigeria. Consecutive patients who had body eruptions suspected to be lichen planus were recruited and histology done for confirmation. The control group included patients' relations and some dermatology patients known to have low risk of hepatitis C virus infection and liver function tests done for both subjects and control after obtaining oral consent from them to participate in the study.

RESULT

Anti- HCV antibodies were detected in nine cases (21.4%) and one case (3.3%) in the control group. This was statistically significant difference between the HCV antibody among the subject and control group (P<0.038). Hypertrophic lichen planus was the most frequent clinical type. Liver function test was not statistically significant among the subject and control group.

CONCLUSION

Lichen planus and Hepatitis C virus appear to have a relationship and the prevalence rate was higher among the subject as compared to the control group in our environment.

Lichen planus and hepatitis virus infections: causal association?

BACKGROUND

The causal association between hepatitis virus infections and lichen planus (LP) remains a matter of controversy. Reliable figures for German patients are still lacking.

PATIENTS AND METHODS

We analyzed the prevalence of serum antibodies against hepatitis B and C viruses (HBV, HCV) in 265 LP patients and compared the results to 257 patients with chronic urticaria (URT) and 222 patients with malignant melanoma (MM). Additionally, we analyzed age- and sex-specific differences.

RESULTS

The prevalence of HBV (13.2 % or 14.7 %) antibodies was significantly higher in patients with LP and URT patients than in the MM control group (HBV: 5.4 %, p < 0.001). The prevalence of HCV antibodies among LP and URT patients (2.6 % or 0.8 %) was not significantly greater (p > 0.05) than in MM patients (0.4 %). The prevalences of HBV and HCV in the MM control group were comparable to those in the general German population (HBV: 5-8 %, HCV: 0.4-0.7 %). An analysis by sub-groups showed that these differences resulted from sex- and age-dependent prevalences. HBV antibodies were significantly more common only in male LP patients (16.1 %) and in male (20.0 %) and female URT patients (15.6 %) aged 31-60 years. The greater prevalence of HCV in female LP patients older than 60 years of age was not significant.

CONCLUSIONS

LP is not specifically associated with hepatitis B or C antibodies in the Caucasian population of Germany. The higher prevalences of HBV antibodies found in LP and URT patients may be a reflection of age- and sex-related factors rather than disease-specific exposure to HBV infections. The increased prevalences seen in patients with LP or URT compared to MM patients may suggest that HBV infection serves as an unspecific trigger for a specific immune reaction of another origin.

Expression of apoptosis related protein in skin lesions of lichen planus and its implication

In order to investigate the role of Caspase-3 and Bax in the pathogenesis of lichen planus, immunohistochemistry was used to detect the expression of Caspase-3 and Bax in skin lesions of the patients with lichen planus and skin tissues of normal subjects. The results showed that positive rate of Caspase-3 and Bax expression in lichen planus were significantly higher than that in normal skins (both P<0.05). Meanwhile, there was a obvious correlation between the increase of Caspase-3 and that of Bax in lichen planus. The expression of Caspase-3 and Bax might play an important role in the development of lichen planus.