Johannes Voegel

Université Côte d'Azur · Faculty of Medicine

Acne vulgaris is a chronic inflammatory skin condition. Skin biopsies are used for detecting inflammation at the cellular and molecular level by different OMICs technologies. However, biopsies are invasive procedures that can be associated with scarring, pain and risk of infection; furthermore, they are not suitable for the analysis of facial skin...

Stratum corneum collected by tape stripping from 10 and 24 subjects with Cutaneous T‐Cell Lymphomas (CTCL) or psoriasis, respectively, were compared using quantitative label‐free mass spectrometry analysis. A non‐supervised statistical analysis (Posneg NMF) based on 352 differentially expressed proteins in both CTCL and psoriasis samples was able t...

Acne vulgaris is a highly heritable common, chronic inflammatory disease of the skin for which five genetic risk loci have so far been identified. Here, we perform a genome-wide association study of 3823 cases and 16,144 controls followed by meta-analysis with summary statistics from a previous study, with a total sample size of 26,722. We identify...

Background Rosacea is a chronic inflammatory skin disease. Characteristic vascular changes in rosacea skin include enlarged, dilated vessels of the upper dermis and blood flow increase. Brimonidine is approved for symptomatic relief of the erythema of rosacea. It acts by selectively binding to α2‐adrenergic receptors present on smooth muscle in the...

Background: Onychomycosis is the most prevalent nail disease and is mainly caused by two dermatophyte species Trichophyton rubrum and Trichophyton interdigitale with a frequency in the range of 80% and 20%, respectively. The secreted protease Sub6 of the subtilisin family, which was never detected in vitro growth conditions, was found to be a robu...

Histone deacetylases (HDACs) are key enzymes involved in epigenetic modulation and were targeted by HDAC inhibitors (HDACis) for cancer treatment. The action of HDACis is not restricted to histones and also prevents deacetylation of other proteins, supporting their wide biological actions. The HuT78 cell line is recognized as a key tool to support...

Background First‐ and third‐generation retinoids are the main treatment for acne. Even though efficacious, they lack full selectivity for retinoic acid receptor (RAR) γ, expressed in the epidermis and infundibulum. Objectives To characterize the in vitro metabolism and the pharmacology of the novel retinoid trifarotene. Materials and methods In v...

Introduction Ceramides play a key role in skin barrier function in homeostatic and pathological conditions and can be sampled non-invasively through stratum corneum collection. Objectives To develop a novel UHPLC/Scheduled MRM method for the identification and relative distribution of eleven classes of ceramides, which are separated by UHPLC and d...

Skin is one of the most important organs of the human body because of its characteristics and functions. There are many alterations, either pathological or physiological, that can disturb its functioning. However, at present all methods used to investigate skin diseases, non‐invasive or invasive, are based on clinical examinations by physicians. Th...

Background: Actinic keratoses (AK) are proliferations of neoplastic keratinocytes in the epidermis resulting from cumulative exposure to ultraviolet radiation (UVR), which are liable to transform into squamous cell carcinoma (SCC). Organ Transplant Recipients (OTR) have an increased risk of developing SCC as a consequence of long-term immunosuppre...

Background Possible outcomes of acne lesions are atrophic scars which may cause serious psychological distress. Current treatments of post‐acne scarring often require invasive procedures. Pathophysiological studies on acne scarring investigated only the first week of papule life. Objectives Study the pathophysiology of atrophic scar formation to i...

Background/purpose: Following intradermal injection, hyaluronic acid (HA)-based fillers tend to spread within the reticular dermis and to distribute between the dermal fibers. This biointegration is commonly measured qualitatively using histological methods. We developed a "toolbox" consisting of a visual scoring and a semi-automatic image analysi...

Background: Protein expression is disturbed in the psoriatic stratum corneum (SC). Noninvasive methods for the description of pathophysiological changes and drug profiling in psoriasis are desirable. Objectives: Undertake large-scale noninvasive protein expression studies in psoriatic SC to identify biomarkers of pathophysiological processes and...

Rosacea is a common, chronic inflammatory skin disease that can present with a variety of signs and symptoms. The potentially simultaneous occurrence of different signs and symptoms is due to different underlying inflammatory pathways, emphasizing the need for complementary treatment approaches. Topical ivermectin cream (10 mg/g) and systemic, oral...

Introduction Le vitiligo touche environ 1 % de la population mondiale. Stopper l’évolutivité de la maladie et repigmenter les zones lésionnelles sont les deux challenges thérapeutiques. La physiopathologie du vitiligo est complexe et fait intervenir de nombreux acteurs cellulaires. Nous avons réalisé une étude transcriptomique des peaux de patients...

Vitiligo affects 1% of the worldwide population. Halting disease progression and repigmenting the lesional skin represent the two faces of therapeutic challenge in vitiligo. We performed transcriptome analysis on lesional, perilesional, and non-depigmented skin from vitiligo patients and on matched skin from healthy subjects. We found a significant...

Rosacea is a common chronic inflammatory skin disease of unknown etiology. Our knowledge about an involvement of the adaptive immune system is very limited. We performed detailed transcriptome analysis, qRT-PCR, and quantitative immunohistochemistry on facial biopsies of rosacea patients, classified according to their clinical subtype. As controls,...

Travoprost medicament compositions for non-daily topical application are useful for simulating or inducing the growth and/or decreasing the loss and/or increasing the density and/or reducing the heterogeneity in the diameter of human hair shafts/follicles, e.g., for the treatment of androgenic alopecia, such medicament compositions being at least t...

The mechanisms of inflammation in acne are currently subject of intense investigation. This study focused on the activation of adaptive and innate immunity in clinically early visible inflamed acne lesions and was performed in two independent patient populations. Biopsies were collected from lesional and non-lesional skin of acne patients. Using Af...

Combination comprising pyrrolidone-5-carboxylic acid and at least one compound from citrulline, arginine and asparagine, and use thereof in the treatment of atopic dermatitis The present invention relates to a composition comprising, in a physiologically acceptable carrier, pyrrolidone-5-carboxylic acid and at least one compound from citrulline, ar...

Acne vulgaris (acne) is a common inflammatory disorder of the cutaneous pilo-sebaceous unit. Here we perform a genome-wide association analysis in the United Kingdom, comparing severe cases of acne (n=1,893) with controls (n=5,132). In a second stage, we genotype putative-associated loci in a further 2,063 acne cases and 1,970 controls. We identify...

Acne vulgaris (acne) is a common inflammatory disorder of the cutaneous pilo-sebaceous unit. Here we perform a genome-wide association analysis in the United Kingdom, comparing severe cases of acne (n=1,893) with controls (n=5,132). In a second stage, we genotype putative-associated loci in a further 2,063 acne cases and 1,970 controls. We identify...

Despite scarce evidence, use of calcium channel blockers is discouraged in rosacea patients, whereas beta-blockers are recommended as an off-label treatment for erythematotelangiectatic rosacea. To study the association between use of calcium channel blockers, beta-blockers, and other antihypertensive drugs and incident rosacea. We conducted a matc...

Psychological conditions, such as traumatic events or stress, have been discussed controversially as aetiologic factors for rosacea. To assess the association between diagnosed depression, other affective disorders or schizophrenia and subsequent incident rosacea. We further aimed at evaluating a possible role of various psychotropic drugs within t...

Abbreviations: ACE, angiotensin-converting enzyme; BMI, body mass index; CI, confidence interval; DM, diabetes mellitus; GPRD, General Practice Research Database; HbA1c, hemoglobin A1c; ISAC, Independent Scientific Advisory Committee; MHRA, Medicines and Healthcare Products Regulatory Agency; NSAID, nonsteroidal anti-inflammatory drug; OAD, oral an...

Background: Rosacea is a common skin disease, involving neurogenic inflammation and neurovascular dysregulation. Migraine has been associated with vascular changes and sterile inflammation. The 2 diseases have been associated over decades, but evidence is scarce. Triptans have vasoconstricting and antiinflammatory properties, but a potential impac...

Rosacea is a chronic facial skin disease of unclear origin. Epidemiological data are scarce and controversial, with reported prevalences ranging from 0·09% to 22%. To our knowledge, incidence rates have not been quantified before. In this observational study we quantified incidence rates of diagnosed rosacea in the U.K. and described demographic ch...

Rosacea is a frequent chronic inflammatory skin disease of unknown etiology. Because early rosacea reveals all characteristics of neurogenic inflammation, a central role of sensory nerves in its pathophysiology has been discussed. Neuroinflammatory mediators and their receptors involved in rosacea are poorly defined. Good candidates may be transien...

Rosacea is a common skin disease with a high impact on quality of life. Characterized by erythema, edema, burning pain, immune infiltration, and facial skin fibrosis, rosacea has all the characteristics of neurogenic inflammation, a condition induced by sensory nerves via antidromically released neuromediators. To investigate the hypothesis of a ce...

Rosacea is a chronic inflammatory skin disease of unknown etiology. Although described centuries ago, the pathophysiology of this disease is still poorly understood. Epidemiological studies indicate a genetic component, but a rosacea gene has not been identified yet. Four subtypes and several variants of rosacea have been described. It is still unc...

Rosacea is a common skin disease with a high impact on quality of life. Characterized by erythema, edema, burning pain, immune infiltration, and facial skin fibrosis, rosacea has all the characteristics of neurogenic inflammation, a condition induced by sensory nerves via antidromically released neuromediators. To investigate the hypothesis of a ce...

Recognition between the base pairs in complementary oligonucleotide strands is a model for efforts to understand intermolecular complexation and to design intermolecular recognition systems generally. We have asked whether synthetic organic chemistry, enzymology, and molecular biology can be applied together to obtain an expanded molecular recognit...

Melasma is a commonly acquired hyperpigmentary disorder of the face, but its pathogenesis is poorly understood and its treatment remains challenging. We conducted a comparative histological study on lesional and perilesional normal skin to clarify the histological nature of melasma. Significantly, higher amounts of melanin and of melanogenesis-asso...

A new synthesis is reported for 4-aminoimidazo[1,2-a]-1,3,5-triazin-2(1H)-one ( =5-aza-7-deaza-isoguanosine; 8), a purine analog that, when incorporated into an oligonucleotide chain, presents a H-bond donor-acceptor-acceptor pattern to a complementary pyrimidine analog. A protected ribose derivative was coupled to 8 to yield 4-amino-8-(β-D-ribofur...

Pituitary adenylate cyclase-activating peptide (PACAP) is an important neuropeptide and immunomodulator in various tissues. Although this peptide and its receptors (ie, VPAC1R, VPAC2R, and PAC1R) are expressed in human skin, their biological roles are unknown. Therefore, we tested whether PACAP regulates vascular responses in human skin in vivo. Wh...

Clobetasol propionate shampoo is effective and safe in treatment of scalp psoriasis (SP). Gene expression profiling of psoriatic skin biopsies led to the identification of numerous disease-related genes. However, it remained unknown whether the gene expression profile of hair follicles of SP patients was also affected. To determine whether psoriasi...

6-Aminopyrazin-2(1H)-one, when incorporated as a pyrimidine-base analog into an oligonucleotide chain, presents a H-bond acceptor-donor-donor pattern to a complementary purine analog. When paired with the corresponding donor-acceptor-acceptor purine in oligonucleotides, the heterocycle selectively contributes to the stability of the duplex, presuma...

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RAR and RXR agonists: A collection of pyrazine-based RAR/RXR ligands were prepared by a series of palladium catalyzed cross-coupling reactions and characterized. Structure–activity relationships were elucidated. Retinoic acid receptor (RAR) α/β-subtype-selective and retinoid X receptor (RXR) inverse agonist activities are described for pyrazine acr...

A series of arotinoids with a central benzofuran or naphthofuran ring structure were synthesized by an efficient three‐step process. Most of these 3‐substituted naphthofuran arotinoids are potent agonists of the retinoic acid receptor (RAR) subtypes, with activities in the nanomolar range. magnified image A collection of arotinoids with a central b...

Psoriasis is characterized by symmetry of plaques and modulation of multiple genes within those plaques. We compared gene expression profiles of plaques of psoriasis at different anatomical sites for both symmetrical and asymmetrical disease to ascertain whether the same genes were expressed. Gene expression profiles were analysed in biopsies from...

A 6-aminopyrazin-2(1H)-one (pyADD), when incorporated as a pyrimidine-base analog into an oligonucleotide chain, presents a H-bond acceptor-donor-donor pattern to 5-aza-7-deazaisoguanine (puDAA), the complementrary donor-acceptor-acceptor purine analog. Reported here are the syntheses of the phosphoramidite of the 2′-deoxyribonucleoside bearing the...

A new synthesis is reported for 4-aminoimidazo[1,2-a]-1,3,5-triazin-2(1H)-one ( =5-aza-7-deaza-isoguanosine; 8), a purine analog that, when incorporated into an oligonucleotide chain, presents a H-bond donor-acceptor-acceptor pattern to a complementary pyrimidine analog. A protected ribose derivative was coupled to 8 to yield 4-amino-8-(β-D-ribofur...

Activation function 2 in the ligand binding domain of nuclear receptors forms a hydrophobic cleft that binds the LXXLL motif of p160 transcriptional coactivators. Here we provide evidence that activation function 2 in the androgen receptor serves as the contact site for the androgen dependent NH2- and carboxyl-terminal interaction of the androgen r...

The nuclear receptor (NR) coactivator TIF2 possesses a single NR interaction domain (NID) and two autonomous activation domains, AD1 and AD2. The TIF2 NID is composed of three NR-interacting modules each containing the NR box motif LxxLL. Mutation of boxes I, II and III abrogates TIF2-NR interaction and stimulation, in transfected cells, of the lig...

6-Aminopyrazin-2(1H)-one, when incorporated as a pyrimidine-base analog into an oligonucleotide chain, presents a H-bond acceptor-donor-donor pattern to a complementary purine analog. When paired with the corresponding donor-acceptor-acceptor purine in oligonucleotides, the heterocycle selectively contributes to the stability of the duplex, presuma...

Nuclear receptors (NRs) act as ligand-inducible transcription factors which regulate the expression of target genes upon binding to cognate response elements. The ligand-dependent activity of the NR activation function AF-2 is believed to be mediated to the transcription machinery through transcriptional mediators/intermediary factors (TIFs). We re...

Nuclear receptors (NRs) act as ligand‐inducible transcription factors which regulate the expression of target genes upon binding to cognate response elements. The ligand‐dependent activity of the NR activation function AF‐2 is believed to be mediated to the transcription machinery through transcriptional mediators/intermediary factors (TIFs). We re...

In its most general form, the Watson-Crick base pair joins a six-membered heterocyclic ring (in natural oligonucleotides, a pyrimidine) with a five-six fused ring system (in natural oligonucleotides, a purine) via three hydrogen bonds, one that joins the two central ring nitrogens of the paired heterocycles, and two that join flanking exocyclic fun...

6-Aminopyrazin-2-one, when incorporated as pyrimidine base analog into an oligonucleotide, might participate in a nonstandard base pair that retains a Watson-Crick geometry but is joined by a nonstandard hydrogen bonding pattern. Such base pairs can, at least in principle, be recognized independently in duplex nucleic acids. To explore the tautomer...

Mikrofiche-Ausg.: 4 Mikrofiches : 24x. Zürich, Eidgenössische Techn. Hochsch., Diss., 1994.