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      Diabetes mellitus and the skin*

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          Abstract

          Several dermatoses are routinely associated with diabetes mellitus, especially in patients with chronic disease. This relationship can be easily proven in some skin disorders, but it is not so clear in others. Dermatoses such necrobiosis lipoidica, granuloma annulare, acanthosis nigricans and others are discussed in this text, with an emphasis on proven link with the diabetes or not, disease identification and treatment strategy used to control those dermatoses and diabetes.

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          Most cited references141

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          Psoriasis and systemic inflammatory diseases: potential mechanistic links between skin disease and co-morbid conditions.

          Psoriasis is now classified as an immune-mediated inflammatory disease (IMID) of the skin. It is being recognized that patients with various IMIDs, including psoriasis, are at higher risk of developing "systemic" co-morbidities, e.g., cardiovascular disease (CVD), metabolic syndrome, and overt diabetes. In non-psoriatic individuals, the pathophysiology of obesity, aberrant adipocyte metabolism, diabetes, and CVDs involves immune-mediated or inflammatory pathways. IMIDs may impact these co-morbid conditions through shared genetic risks, common environmental factors, or common inflammatory pathways that are co-expressed in IMIDs and target organs. Given that pathogenic immune pathways in psoriasis are now well worked out and a large number of inflammatory mediators have been identified in skin lesions, in this review we will consider possible mechanistic links between skin inflammation and increased risks of (1) obesity or metabolic alterations and (2) CVD. In particular, we will discuss how well-established risk factors for CVD can originate from inflammation in other tissues.
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            Immune dysfunction in patients with diabetes mellitus (DM).

            Patients with diabetes mellitus (DM) have infections more often than those without DM. The course of the infections is also more complicated in this patient group. One of the possible causes of this increased prevalence of infections is defects in immunity. Besides some decreased cellular responses in vitro, no disturbances in adaptive immunity in diabetic patients have been described. Different disturbances (low complement factor 4, decreased cytokine response after stimulation) in humoral innate immunity have been described in diabetic patients. However, the clinical relevance of these findings is not clear. Concerning cellular innate immunity most studies show decreased functions (chemotaxis, phagocytosis, killing) of diabetic polymorphonuclear cells and diabetic monocytes/macrophages compared to cells of controls. In general, a better regulation of the DM leads to an improvement of these cellular functions. Furthermore, some microorganisms become more virulent in a high glucose environment. Another mechanism which can lead to the increased prevalence of infections in diabetic patients is an increased adherence of microorganisms to diabetic compared to nondiabetic cells. This has been described for Candida albicans. Possibly the carbohydrate composition of the receptor plays a role in this phenomenon.
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              The 'psoriatic march': a concept of how severe psoriasis may drive cardiovascular comorbidity.

              There is increasing awareness that psoriasis is more than 'skin deep'. Several recent reviews focussed on biomarkers indicating the systemic dimension of psoriasis and the aspect of comorbidity psoriasis shares with other chronic inflammatory diseases, such as Crohn's disease and rheumatoid arthritis. Of emerging significance is the relationship to cardiovascular disease, as this contributes substantially to the patients' increased mortality. In this viewpoint, we examine currently available evidence favouring the concept of a causal link between psoriasis and cardiovascular disease: systemic inflammation may cause insulin resistance, which in turn triggers endothelial cell dysfunction, leading to atherosclerosis and finally myocardial infarction or stroke. While this 'psoriatic march' is not yet formally proven, it raises clinically and academically relevant questions, and gains support by recent observations of numerous investigators. © 2011 John Wiley & Sons A/S.
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                Author and article information

                Journal
                An Bras Dermatol
                An Bras Dermatol
                abd
                Anais Brasileiros de Dermatologia
                Sociedade Brasileira de Dermatologia
                0365-0596
                1806-4841
                Jan-Feb 2017
                Jan-Feb 2017
                : 92
                : 1
                : 8-20
                Affiliations
                [1 ]Department of Clinical Medicine - Faculdade de Medicina de Botucatu - Universidade Estadual Paulista "Júlio de Mesquita Filho" (UNESP) - Botucatu (SP), Brazil.
                [2 ]Department of Dermatology and Radiotherapy - Faculdade de Medicina de Botucatu - Universidade Estadual Paulista "Júlio de Mesquita Filho" (UNESP) -Botucatu (SP), Brazil.
                Author notes
                Mailing address: Vidal Haddad Junior, Departamento de Dermatologia, Caixa Postal 557, 18618970 Botucatu, SP, Tel: 14 3880 1259. Email: haddadjr@ 123456fmb.unesp.br
                Article
                10.1590/abd1806-4841.20175514
                5312172
                c4c3039e-7e8e-48b6-91a0-958ad342a3b7
                ©2017 by Anais Brasileiros de Dermatologia

                This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License which permits unrestricted non-commercial use, distribution, and reproduction in any medium provided the original work is properly cited.

                History
                : 17 December 2015
                : 29 June 2016
                Categories
                Continuing Medical Education

                dermatology,diabetes mellitus,skin manifestations
                dermatology, diabetes mellitus, skin manifestations

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