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Topic Review
Lack of PRAME Expression in Cutaneous T-Cell Lymphomas
Cutaneous T-cell lymphomas (CTCLs) are rare tumors with no established markers that can reliably distinguish between benign and malignant lesions. Preferentially Expressed Antigen in Melanoma (PRAME) is a cancer/testis antigen that is found in many solid and hematologic malignancies. PRAME overexpression typically portends a poor prognosis and lower chemotherapeutic response. To date, no studies have established a role for PRAME in CTCL.  An analysis was performed on 47 cases definitively diagnosed as CTCL: 25 mycosis fungoides, 2 Sezary syndrome, 5 CD30+ lymphoproliferative disorder, 7 primary cutaneous anaplastic large T-cell lymphoma, 3 primary cutaneous CD4+ small/medium T-cell lymphoproliferative disorder, 1 subcutaneous panniculitis-like T-cell lymphoma, and 4 angiocentric T-cell lymphoma. PRAME immunohistochemistry was completely negative in all cases. PRAME expression was not found in any CTCL subtypes, suggesting that the pathogenesis of CTCL is not mediated by PRAME. Further study is required to identify biomarkers that might aid in the diagnosis and prognostication of CTCLs.
  • 448
  • 11 Jan 2022
Topic Review
Dermal Adipocytes
Adipocytes from the superficial layer of subcutaneous adipose tissue undergo cyclic de- and re-differentiation, which can significantly influence the development of skin inflammation under different cutaneous conditions. This inflammation can be connected with local loading of the reticular dermis with lipids released due to de-differentiation of adipocytes during the catagen phase of the hair follicle cycle. Alternatively, the inflammation parallels a widespread release of cathelicidin, which typically takes place in the anagen phase (especially in the presence of pathogens). Additionally, trans-differentiation of dermal adipocytes into myofibroblasts, which can occur under some pathological conditions, can be responsible for the development of collateral scarring in acne.
  • 447
  • 18 Apr 2022
Topic Review
Disease Burden of Atopic Dermatitis in China
Atopic dermatitis (AD) is now a global health problem and has been attracting extensive attention from both academic and public society in China. The prevalence of AD has been increasing rapidly in China, partially due to the increased recognition of the disease; there are still substantial amounts of over-diagnosed eczema and under-diagnosed AD. Chinese dermatologists see many AD patients with atypical manifestation, which poses a challenge to the diagnosis. The Chinese diagnostic criteria for adults and pediatric patients with AD have been proposed respectively and validated with high sensitivity and specificity. International and Chinese guidelines for management of AD have been popularized
  • 447
  • 18 Sep 2023
Topic Review
Cutaneous T Cell Lymphoma
Primary cutaneous lymphomas constitute a heterogeneous group of disorders characterized by monoclonal proliferations of lymphocytes with infiltration primarily involving the skin, modified skin appendages and certain mucosal sites. Primary cutaneous lymphomas are a heterogeneous group of disorders and a current area of unmet need in dermato-oncology due to the limited options available for advanced cases.
  • 444
  • 16 Mar 2023
Topic Review
Clinical Applications of Polypodium leucotomos (Fernblock®) in Oncodermatology
Exposure to sun radiation leads to higher risk of sunburn, pigmentation, immunosuppression, photoaging and skin cancer. In addition to ultraviolet radiation (UVR), recent research indicates that infrared radiation (IR) and visible light (VIS) can play an important role in the pathogenesis of some of these processes. Detrimental effects associated with sun exposure are well known, but new studies have shown that DNA damage continues to occur long after exposure to solar radiation has ended. Regarding photoprotection strategies, natural substances are emerging for topical and oral photoprotection. In this sense, Fernblock®, a standardized aqueous extract of the fern Polypodium Leucotomos (PLE), has been widely administered both topically and orally with a strong safety profile. Thus, this extract has been used extensively in clinical practice, including as a complement to photodynamic therapy (PDT) for treating actinic keratoses (AKs) and field cancerization.
  • 443
  • 21 Jul 2023
Topic Review
Psoriasis and Epithelium Derived Cytokines
Epithelium-derived cytokines (TSLP, IL-25, IL-33), show an increasing potential for use in target therapy for these patients, and demonstrate a direct link between a generalized inflammatory and oxidative stress status and the human skin. Psoriasis (Pso), characterized by erythematous, scaly patches on the skin and affecting other body districts such as bones and accessory skin structures, presents comorbidities with seemingly unrelated non-skin conditions such as a metabolic syndrome, heart disease and psychiatric disorders.
  • 442
  • 05 Jan 2022
Topic Review
Renin-Angiotensin System in Autoimmune Dermatological Diseases
Autoimmune dermatological diseases (AIDD) encompass a diverse group of disorders characterized by aberrant immune responses targeting the skin and its associated structures. In recent years, emerging evidence suggests a potential involvement of the renin–angiotensin system (RAS) in the pathogenesis and progression of these conditions. RAS is a multicomponent cascade, primarily known for its role in regulating blood pressure and fluid balance. All of the RAS components play an important role in controlling inflammation and other immune responses. Angiotensin II, the main effector, acts on two essential receptors: Angiotensin Receptor 1 and 2 (AT1R and AT2R). A disturbance in the axis can lead to many pathological processes, including autoimmune (AI) diseases. AT1R activation triggers diverse signaling cascades involved in inflammation, fibrosis and tissue remodeling.
  • 441
  • 19 Dec 2023
Topic Review
JAK/STAT Signaling Pathway Inhibitors
The JAK/STAT pathway is evolutionarily conserved, and it includes three main players: a ligand-receptor complex, for example, cytokines such as IL-2, IL-4, IL-6, IL-12, and IL-23; growth hormone (GH) growth factors (GF) and their receptors, one or two kinases belonging to the JAK family and one or two members of the STAT family.
  • 437
  • 26 Apr 2023
Topic Review
Extracellular Matrix in Skin Wound Healing
Impaired wound healing is one of the unsolved problems of modern medicine, affecting patients’ quality of life and causing serious economic losses. Impaired wound healing can manifest itself in the form of chronic skin wounds or hypertrophic scars. Research on the biology and physiology of skin wound healing disorders is actively continuing, but, unfortunately, a single understanding has not been developed. The attention of clinicians to the biological and physiological aspects of wound healing in the skin is necessary for the search for new and effective methods of prevention and treatment of its consequences. In addition, it is important to update knowledge about genetic and non-genetic factors predisposing to impaired wound healing in order to identify risk levels and develop personalized strategies for managing such patients. Wound healing is a very complex process involving several overlapping stages and involving many factors. Extracellular matrix has played a role in wound healing.
  • 436
  • 24 Dec 2021
Topic Review
Vitamin D, Sun Exposure and Skin Cancer
The current vitamin D deficiency epidemic is accompanied by an increase in endemic skin cancer. Ultraviolet (UV) exposure (neither artificial nor natural) is not the ideal source to synthesize vitamin D. There is conflicting epidemiological evidence regarding vitamin D, non-melanoma skin cancer (NMSC), and cutaneous melanoma (CMM), confounded by the effect of sun exposure and other factors. 
  • 434
  • 29 Mar 2022
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