4-Hydroxynonenal Contributes to Fibroblast Senescence in Skin Photoaging Evoked by UV-A Radiation

Solar ultraviolet A (UV-A) radiation promotes a huge variety of damages on connective tissues and dermal fibroblasts, including cellular senescence, a major contributor of skin photoaging. The mechanisms of skin photoaging evoked by UV-A partly involve the generation of reactive oxygen species and lipid peroxidation. We previously reported that 4-hydroxynonenal (HNE), a lipid peroxidation-derived aldehyde, forms adducts on elastin in the skins of UV-A irradiated hairless mice, possibly contributing to actinic elastosis. In the present study, we investigated whether and how HNE promotes fibroblast senescence in skin photoaging. Dermal fibroblasts of skins from UV-A-exposed hairless mice exhibited an increased number of γH2AX foci characteristic of cell senescence, together with an accumulation of HNE adducts partly colocalizing with the cytoskeletal protein vimentin. Murine fibroblasts exposed to UV-A radiation (two cycles of 15 J/cm2), or HNE (30 µM, 4 h), exhibited senescence patterns characterized by an increased γH2AX foci expression, an accumulation of acetylated proteins, and a decreased expression of the sirtuin SIRT1. HNE adducts were detected on vimentin in cultured fibroblasts irradiated by UV-A or incubated with HNE. The HNE scavenger carnosine prevented both vimentin modification and fibroblast senescence evoked by HNE in vitro and in the skins of UV-A-exposed mice. Altogether, these data emphasize the role of HNE and lipid peroxidation-derived aldehydes in fibroblast senescence, and confirm the protective effect of carnosine in skin photoaging.

Geriatric dermatosis; The concerns of aging skin.

Objectives: To study the cutaneous manifestations in elderly and their association with gender. Study Design: Cross Sectional study. Setting: Sir Syed Hospital Karachi. Period: Jan 2016 to Jan 2018. Material & Methods: Total 217 geriatric cases (>60 years; both genders) were included from outdoor dermatology clinic. The previous pregnancy, lactation, severe systemic disease and drug induced skin changes were excluded. The association of skin manifestation with gender was analyzed by Chi-square test with significant p<0.05. Results: Among 217 cases, there were 126(58%) females and 91(42%) males. Mean age was 69.3+4.99 years. Wrinkling was seen in 92%, skin laxity in 54.8%, xerosis (43%), dryness (65%), sagging (46%), pigmentation (37%), eczema (25%), sparse hair (21%), skin atrophy (19%), tinea (13%) and LSC (10%). While herpes zoster, psoriasis, onychomycosis, tinea corporis ,asteotic eczema in 7%. Folliculitis 6%, scabies and bullous pemphigoid seen in 5%, while lichen planus, actinic elastosis, BCC, Prurigo nodularis in 3%. Cellulitis, pediculosis, Seborrheic Dermatitis and contact dermatitis were seen in 2% followed by 1% cases of warts, candidiasis, photodermatosis and SCC seen in our study. Folliculitis (6%) was the most frequent bacterial infection followed by impetigo (0.9%). Herpes zoster (6.5%) was frequent among viral infections followed by warts (0.9%) and HSV-1 (0.9%). Tinea (13.4%) was most frequent fungal infection followed by onychomycosis (7%) and candidiasis (0.9%). Scabies was most common parasitic infection (4.6%) followed by pediculosis (2.3%). Eczema seen in 24.8%. The benign dermatosis, Actinic elastosis was frequent (3.2%), stucco keratosis 4(1.8%), Keratoacanthoma (0.9%). Amongst malignancies, BCC was common (3.2%), followed by SCC (1.4%). 5% Bullous Pemphigoid cases were found. The psychocutaneous disorder included LSC (10%), prurigo nodularis (2.8%) and neurotic excoriation (0.9%). Wrinkling, sagging, dryness of skin, actinic keratosis, actinic elastosis was found to be associated with female gender, however cellulitis, squamous cell carcinoma and asteatotic eczema with male gender. Conclusion: Geriatric population is facing multiple dermatological concerns. Contributory factors being the natural aging process, exposure to UV radiation, pathogens, dryness, humidity, temperature and chemical irritants. Female geriatrics are prone to wrinkling, sagging, dryness of skin and male geriatrics to basal cell carcinoma. There is need to address the skin problems in elderly for better quality of life in geriatrics.

Actinic Cheilitis: Report of Three Cases and Review of Literature

Actinic cheilitis (AC) is a potentially malignant lip disorder induced by chronic exposure to ultraviolet light, which mainly affects the vermilion of the lower lip of adults and fair skin. If it is not treated in a timely manner it can become a squamous cell carcinoma of the lip. Histologically, AC presents a series of alterations at the epithelial level ranging from hyperplasia to dysplasia; Connective tissue presents different degrees of actinic elastosis accompanied by inflammatory infiltrate. The objective of this work is to present three cases of patients with AC and analyze their clinical and histopathological characteristics.

Elastosis in Actinic Cheilitis. Literature Review

The extracellular matrix (ECM) plays an important role in the regulation of biological events, such as cell migration, proliferation and differentiation. Chronic exposure to ultraviolet (UV) light causes elastosis (to varying degrees), which corresponds to a basophilic degeneration of the ECM. Actinic cheilitis (AC) is a potentially malignant lip lesion induced by regular and prolonged exposure to UV light, which mainly affects the vermilion. AC lesions have a complex stroma characterized by the presence of elastosis, chronic inflammatory infiltrate of different intensity and the appearance of telangiectatic blood vessels. Within this inflammatory infiltrate a significant increase of mast cells (MCs) has been described, located especially around areas of elastosis and at the subepithelial zone. It has been proposed that actinic elastosis is produced both, by degenerative processes and by abnormal synthesis of elastic fibers by photodamaged fibroblasts, which is accompanied by morphological changes in collagen. Although the fibroblast would play a major role in actinic elastosis formation, several studies suggest that other cell types such as MCs also contribute significantly to actinic ECM damage. The purpose of this review is to discuss the characteristics of elastosis in AC.

FACTORS ASSOCIATED WITH BASALIOMA IN INHABITANTS OF THE MOSCOW REGION

There were studied the factors associated with basalioma in inhabitants of the Moscow region. 169 patients with solitary and multiple basiolioma and 130 controls were examined. 48 factors were assessed. Among the high-importance factors there were I skin phototype, actinic keratosis, solar cheilitis, actinic elastosis, rhomboid wrinkles, weighed heredity in oncological skin diseases, radiation therapy in the anamnesis. Less important factors were as follows: sunburn in childhood, living in regions with radiation pollution, the presence of occupational hazards. Multiple basalioma more often developed in persons who had various occupational hazards.

Immunohistochemical Patterns in the Interfollicular Caucasian Scalps: Influences of Age, Gender, and Alopecia

Skin ageing and gender influences on the scalp have been seldom studied. We revisited the changes in the interfollicular scalp. The study was performed on a population of 650 volunteers (300 women and 350 men) for over 7 years. Three age groups were selected in both genders, namely, subjects aged 20–35, 50–60, and 60–70 years. The hair status was further considered according to nonalopecic and alopecic patterns and severity (discrete, moderate, and severe). Biopsies from the parietal area were processed for immunohistochemistry. Stromal cells were distinguished according to the presence of vimentin, Factor XIIIa, CD117, and versican. Blood and lymphatic vessels were highlighted by Ulex europaeus agglutinin-1 and human podoplanin immunoreactivities, respectively. Actinic elastosis was identified by the lysozyme coating of elastic fibres. The epidermis was explored using the CD44 variant 3 and Ki67 immunolabellings. Biplot analyses were performed. Immunohistochemistry revealed a prominent gender effect in young adults. Both Factor XIIIa+ dermal dendrocytes and the microvasculature size decreased with scalp ageing. Alopecia changes mimicked stress-induced premature senescence.