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Adhesion Molecules in Non-Melanoma Skin Cancers: a Comprehensive Review JOANNA POGORZELSKA-DYRBUS 1 and JACEK C

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Adhesion Molecules in Non-Melanoma Skin Cancers: a Comprehensive Review JOANNA POGORZELSKA-DYRBUS 1 and JACEK C in vivo 35 : 1327-1336 (2021) doi:10.21873/invivo.12385 Review Adhesion Molecules in Non-melanoma Skin Cancers: A Comprehensive Review JOANNA POGORZELSKA-DYRBUS 1 and JACEK C. SZEPIETOWSKI 2 1“Estevita” Specialist Medical Practice, Tychy, Poland; 2Department of Dermatology, Venereology and Allergology, Wroclaw Medical University, Wroclaw, Poland Abstract. Basal cell carcinoma (BCC) and squamous cell of NMSC develops from basal epithelial cells of hair carcinoma (SCC) are the most frequently diagnosed cancers, follicles or pluripotent epidermal basal cells and has a generating significant medical and financial problems. metastatic rate of only 0.0028-0.05% (1). Depending on the Cutaneous carcinogenesis is a very complex process different features of tumor cells, there are many characterized by genetic and molecular alterations, and histological types of BCC, with different, but still low mediated by various proteins and pathways. Cell adhesion metastatic potential (2). SCC develops from the molecules (CAMs) are transmembrane proteins responsible proliferating squamous layer of the epidermis, shows a for cell-to-cell and cell-to-extracellular matrix adhesion, metastatic rate of 0,1-9,9% and contributes to engaged in all steps of tumor progression. Based on their approximately 75% of deaths due to NMSC (3, 4). structures they are divided into five major groups: cadherins, Although both skin cancers generally have a good integrins, selectins, immunoglobulins and the CD44 family. prognosis, due to their high prevalence, they generate Cadherins, integrins and CD44 are the most studied in the significant medical and financial problems worldwide. The context of non-melanoma skin cancers. The differences in most important risk factor of NMSC is exposure to the expression of adhesion molecules may be related to the ultraviolet radiation, and both ultraviolet (UV) B and UVA invasiveness of these tumors, through the loss of tissue play crucial roles in skin carcinogenesis affecting every integrity, neovascularization and alterations in intercellular stage, including direct cellular damage, production of signaling processes. In this article, each group of CAMs is reactive oxygen species, DNA alterations, and impairment briefly described and the present knowledge on their role in of cell-mediated immune response (5). the development of non-melanoma skin cancers is A wide variety of risk factors of NMSC is known, such as summarized. Fitzpatrick I and II skin phototypes, age over 50 years, family history of skin cancers, chronic immunosuppression, Non-melanoma skin cancers (NMSC) are the most long-lasting ulceration, and scars. In addition, exposure to frequently diagnosed malignancies and their prevalence has carcinogenic substances, like arsenic and tobacco, HPV increased dramatically over the last 30 years. Basal cell viruses, actinic keratosis, and chronic dermatoses, including carcinoma (BCC) and squamous cell carcinoma (SCC) lichen sclerosus, lupus erythematosus, and lichen planus, are represent 99% of all NMSC. BCC, which constitutes 70% associated with a higher risk of SCC (6). Carcinogenesis is a very complex process; it is mediated by various proteins and pathways and characterized by genetic and molecular alterations. Changes in the expression This article is freely accessible online. or function of cell adhesion molecules (CAM) are involved in all steps of the progression of the malignancy, starting Correspondence to: Prof. Jacek C. Szepietowski (ORCID: 0000-0003- from the detachment of tumor cells from the primary site, 0766-6342), Department of Dermatology, Venereology and Allergology, intravasation into the blood, extravasation into distant tissues Wroclaw Medical University, Chalubinskiego 1 50-368 Wroclaw, Poland. Tel: +48 717842286, e-mail: jacek.szepietowski@umed.wroc.pl and formation of the secondary lesions. Hence, the aim of the present review was to summarize Key Words: Cell adhesion molecules, non-melanoma skin cancer, the present knowledge on the role of CAM in the basal cell carcinoma, squamous cell carcinoma, review. development of non-melanoma skin cancers. 1327 in vivo 35 : 1327-1336 (2021) Cell Adhesion Molecules: Division, architecture. The epithelial cells may acquire a Functions, and Physiological Involvement mesenchymal-like phenotype, detach from their neighboring cells and migrate, and in case of neoplasms form metastases. Cell adhesion molecules are transmembrane proteins This process is called epithelial-mesenchymal transition responsible for cell-to-cell and cell-to extracellular matrix (EMT) and the loss of E-cadherin and expression of N- adhesion (7) playing also a crucial role in intercellular cadherin, often called the “cadherin switch”, is considered as signaling and the structure of the extracellular the most important indicator of this phenomenon (1). In this microenvironment. Moreover, they play important roles in context, E-cadherin is also known as a metastasis suppressor physiologic processes like embryogenesis and organ growth, protein (14, 15). cell migration and differentiation, and wound healing, and Several studies showed abnormal expression of E-cadherin are fundamental elements for the maintenance of tissue in various skin carcinomas. In BCC, there is an overall integrity. However, over 100 different CAM participate in a tendency for lower expression of E-cadherin, when variety of pathological processes such as inflammation, compared with normal skin, and low expression is more tumor invasion and metastasis (7). Changes in the expression frequently observed in the more aggressive histological types and function of CAMs have been recently extensively of the tumor (16-19). The observed reduction of E-cadherin studied. Based on their structures they are divided into five expression was more pronounced in the infiltrative and major groups: cadherins, integrins, selectins, morpheaphorm BCCs, while the superficial and nodular immunoglobulins and CD44 family (Table I). types generally demonstrate less reduced expression of this molecule (17, 20). Moreover, with the higher invasiveness Cadherins of the tumor, the membranous expression of E-cadherin is reduced and the cytoplasmic expression is increased (21). It Cadherins are transmembrane glycoproteins and the most is consistent with the current state of knowledge that high E- studied group of adhesion molecules, divided into classic cadherin expression in the cell cytoplasm and low expression cadherins (including E-epithelial, N-neural, P-placental), in the cell membrane may be associated with tumor which are the main mediators of calcium-dependent cell-cell aggressiveness. In support, it has been suggested that correct adhesions, and nonclassic cadherins, including desmosomal cell adhesion requires strong membranous activity of E- cadherins and newly discovered protocadherins (8). These cadherin (22, 23). adhesion molecules play a pivotal role during embryogenesis In contrast, it is noteworthy that there are reports revealing and morphogenesis and also in the maintenance of adult no difference in the expression of E-cadherin in the BCC tissue architecture (8). They are widely present in the normal specimens, regardless of their histological type (24-26). A epithelium and determine its integrity. Major cadherins in the possible explanation of such discrepancy could be the skin include E-cadherin and the desmosomal cadherin different tissue fixation methods used (25). desmoglein 1 (9). The results of the studies in SCC are more consistent. In E-cadherin mediates interactions between keratinocytes almost all analyzed SCC specimens, the expression of E- and also between keratinocytes and Langerhans cells, which cadherin was reduced compared with normal epidermis (18, are the main immune cells of the skin (10, 11). Classic 23-24, 27-32) and this reduction was more pronounced in cadherins are composed of five extracellular domains, a less differentiated and more invasive tumors (29, 33). transmembrane segment and an intracellular domain. The However, the contribution of lower levels of E-cadherin in most studied and first identified is E-cadherin, also known the metastatic process is still debatable, with conflicting as cadherin-1 or epithelial cadherin, which is expressed in results demonstrating either lower or a similar expression of almost all epithelial tissues and is responsible for epithelial this molecule in tumors with and without lymph node integrity and cell polarity (12). The cytoplasmic domain of metastases (24, 25), although once more, the different E-cadherin interacts with groups of cytoplasmic regulatory fixation method utilized in one of those studies could explain proteins called catenins, which mediate binding of the such difference (25). complex to cytoskeletal actin filaments. The E-cadherin– Many studies on E-cadherin showed its contribution in catenin complex plays a key role in cellular adhesion, both SCC and BCC, but only a few investigations have been regulates cadherin stability, and functions in cell signaling conducted on N-cadherin in NMSC. N-cadherin is not found (13). In the normal skin, E-cadherin shows homogeneous in normal squamous epithelium, although is known for membranous distribution in the whole epidermis, with the angiogenesis stimulation in some cancers (33). In BCC, N- exception of the lower pole of basal keratinocytes, which are cadherin was found to be up-regulated in the metastatic, but in contact with the basement membrane (10). not in non-metastatic tumors (34), while in SCC, the tumors Loss
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