Phototherapy in Dermatology

Phototherapy is a therapeutic procedure in dermatology. Phototherapy uses certain ultraviolet wavelengths classified into 3 types,broadband UVB (BBUVB), narrowband UVB (NBUVB), and psoralen UVA (PUVA). The most widely used is NBUVB for treating psoriasis, atopic dermatitis and vitiligo. The mechanism of action of phototherapy is to reduce epidermal proliferation, suppress the immune system, reduce the inflammatory process, and induce repigmentation. Before starting phototherapy, the dose adjustment depends on skin type and minimal erythema dose (MED). Frequency of use is recommended based on the severity of the disease, continuously administered needed. Besides of this therapeutic effect, some contraindications and side effects that need to be considered in the use of phototherapy such as drug interactions, photoallergic and risk of skin malignancy.

Bovine Papillomatosis in a One-Year-Old Kedah Kelantan Cross Cattle Calf

Bovine papillomatosis is an infectious disease, characterized by the presence of multiple benign mass that can regress spontaneously or progress into malignant neoplasia caused by bovine papillomavirus. Epidermal proliferation causes the lesion to have the keratotic surface that resembles a cauliflower. In this case report, bovine papillomatosis that was encountered in a farm at UMK Bachok, Kelantan will be discussed. A year-old male Kedah Kelantan (KK) cross cattle calf was presented with a presence of multiple, circular, around 1-2cm in diameter, wart-like lesion localized on the ventral part of the mandible and on the chin. A series of diagnostic approaches had been conducted to reach the definitive diagnosis, which includes biopsy for histopathology, polymerase chain reaction (PCR) and fecal examination.

Epidermal Proliferation and Differentiation in Ichthyosis Vulgaris

A B S T R A C TEpidermal proliferation and differentiation is a physiological process which playscrucial role in protecting human body from external environment. Ichthyosisvulgaris is a disease caused by disruption of epidermal differentiation process.Disrupted of profilaggrin conversion to filaggrin caused by mutations from thefilaggrin gene (FLG) located on chromosome 1q21. Recently, caused of ichthyosisvulgaris is mutation of the CASP14 gene on chromosome 19p13.12 which producescaspase-14, is involved in the proteolytic degradation of filaggrin. Clinicalmanifestations of ichthyosis vulgaris are hyperlinear palmar and plantar, keratosispilaris, xerosis, and localized or generalized scaling of the skin. Application ofemollients, humectants and keratolytic agents are the main treatment of ichthyosisvulgaris. Further research on caspase-14 as a therapeutic target is needed in thetreatment of ichthyosis vulgaris.

Structural description of sea turtle fibropapilloma

Fibropapillomatosis is a neoplastic disease that affects sea turtles. It is characterized by multiple papillomas, fibropapillomas and cutaneous and/or visceral fibromas. Although its etiology has not been fully elucidated, it is known that there is a strong involvement of an alpha - herpesvirus, but the influence of other factors such as parasites, genetics, chemical carcinogens, contaminants, immunosuppression and ultraviolet radiation may be important in the disease, being pointed out as one of the main causes of a reduction in the green turtle population. Thus, the objective of this article was to describe the morphology of cutaneous fibropapillomas found in specimens of the green turtle (Chelonia mydas), using light and scanning electron microscopy in order to contribute to the mechanism of tumor formation. Microscopically, it presented hyperplastic stromal proliferation and epidermal proliferation with hyperkeratosis. The bulky mass was coated with keratin, with some keratinocyte invaginations, that allowed the keratin to infiltrate from the epidermis into the dermis, forming large keratinized circular spirals. Another fact that we observed was the influence of the inflammation of the tumors caused by ectoparasites.

Dermal EZH2 simultaneously orchestrates dermal differentiation and epidermal proliferation during murine skin development

Skin development and patterning is dependent on factors that regulate the stepwise differentiation of dermal fibroblasts concomitant with dermal-epidermal reciprocal signaling, two processes that are poorly understood. Here we show that dermal EZH2, the methyltransferase enzyme of the epigenetic Polycomb Repressive Complex 2 (PRC2), is a new coordinator of both these processes. Dermal EZH2 activity is present during dermal fibroblast differentiation and is required for spatially restricting Wnt/β-catenin signaling to reinforce dermal fibroblast cell fate. Later in development, dermal EZH2 regulates the differentiation to reticular dermal fibroblasts and initiation of secondary hair follicles. Embryos lacking dermal Ezh2 have elevated epidermal proliferation and differentiation that can be rescued by small molecule inhibition of retinoic acid (RA) signaling. Together, our study reveals that dermal EZH2 acts as a rheostat to control the levels of Wnt/β-catenin and RA signaling to impact fibroblast differentiation cell autonomously and epidermal keratinocyte development non-cell autonomously, respectively.