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<p id="p1">Despite extensive research during the last couple of years, lipedema still appears enigmatic in respect to its pathogenesis. In our in vitro study, we have set out to further characterize lipedema adipocytes, concentrating on gene and protein expression, which might help to develop ideas explaining the excessive accumulation of adipose tissue in women with lipedema. Using 2D cultures we show that gene expression in lipedema and non-lipedema adipocytes differs significantly in terms of genes related to lipid droplet size determination, insulin signaling and glucose uptake. A pronounced hypertrophy, recognizable by a significantly increased average lipid droplet size, was visible in differentiated lipedema adipocytes grown in 3D cultures. In addition, gene and protein expression related to inflammation and fibrosis were upregulated in lipedema adipocytes compared to controls, supporting earlier reports. Taken together, results from our in vitro studies suggest that lipedema adipose cells are capable of retaining their hypertrophic nature under culture conditions and open new aspects focusing on insulin signaling and PDGFRA-mediated balancing of adipogenic versus fibrogenic differentiation of lipedema adipose tissue.</p>
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Lipedema is a disorder characterized by large amount of subcutaneous fat in the upper and lower legs due to both hyperplasia and hypertrophy. It occurs almost exclusively in females, although a few cases in men have been reported.(,) The condition is relatively rare and often seen in patients with a family history of the disease.(,) Lipedema does not yet have a registered diagnosis in the International Classification of Diseases (ICD-10) of the World Health Organization (WHO), making it difficult to establish its prevalence. However, lipedema is believed to affect nearly 11% of adult women, with noted significant differences in prevalence worldwide.(,)(,) The literature search for this report did not find epidemiological data for lipedema in Canada. The cause of lipedema is unknown, and it is likely that the condition is frequently misdiagnosed or wrongly diagnosed as lifestyle-induced obesity or lymphedema (i.e., localized fluid retention and tissue swelling).(,) However, although lipedema and obesity can co-occur, unlike obesity, lipedema usually targets the legs and thighs, without affecting the feet or hands, and the adipose tissue in lipedema is painful.(,)(,)(–) The lymphatic system remains unimpaired in the initial stages and can keep up with the increased amount of interstitial fluid.(,) However, patients with lipedema may develop secondary lymphedema (lipolymphoedema) if the fatty deposits compromise the lymphatic system. Lipedema targets both legs (and sometimes, also both hands) to the same extent and has a bilateral, nearly symmetrical presentation.(–) The excessive fat deposits are typically unresponsive to traditional weight loss interventions such as physical activity or dietary measures.(,)(,) Symptoms of the condition include pain in the lower extremities, particularly with pressure, loss of strength, easy bruising, and deterioration in daily activity levels that can greatly impact the health and quality of life of the individual with lipedema.(,)(,) Untreated lipedema may result in secondary problems including osteoarthritis, reduced mobility, psychological impairment, and lowered self-esteem. Over time, the weight of the excessive fat build-up can cause the knees to knock inward or droop to the side of the leg, and impair the inability to walk. As mentioned, in the later stages, secondary lymphedema can occur due to imbalance in the amount of fluid produced and drained by the lymphatic system.(–)(,)(,)(,) Lipedema poses a significant psychosocial burden for most patients, and associated effects often limit capacity for exercise. In severe cases, lipedema may lead to absence from work or occupational disability. There is no known curative therapy for lipedema. The primarily focus of treatment is to reduce its related lower extremity symptoms, disability, and functional limitations to improve patients’ quality of life, as well as preventing disease progression.(–)(,)(,) Treatment is divided into conservative therapy and surgical interventions. The conservative therapy includes promotion of individually adjusted healthy lifestyle, combined decongestive therapy (CDT), and other supportive measures, such as psychosocial therapy and orthopedic counseling. Conservative therapy can alleviate some lipedema symptoms such as heaviness, pain, and secondary swelling. However, these benefits are short-lived, usually requiring repeat treatment within days. Liposuction is the main surgical interventions for lipedema. Commonly used liposuction methods for lipedema are tumescent anesthesia (TA) liposuction, and water assisted liposuction (WAL). In TA liposuction, tumescent is infused in the subcutaneous tissues to cause the fat cells to swell and vessels to constrict; then blunt micro-cannulas are used to suction the fat.(,)(,) Water assisted liposuction uses a pressure spray of tumescent fluid to dislodge the fat from the connective tissue, rather than utilizing a cannula. Unlike traditional liposuction, both TA and WAL rely on the local anesthetics in the tumescent fluid and do not require general anesthesia. The objective of this report is to summarize the evidence regarding the clinical effectiveness of liposuction for the treatment of lipedema and the recommendations of evidence-based clinical guidelines regarding its use for this condition.
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Adipose tissue is a specialized connective tissue which, depending on type, plays different and significant roles in the human body: protects against environmental factors, stores lipids and triacylglycerol, synthesizes fatty acids and is involved in the process of thermogenesis. It is also a major secretory organ and highly active metabolic tissue. It secretes, for example, cholesterol, retinol, steroid hormones, prostaglandins and proteins known as "adipokines". Some of these molecules may be associated with pathologies such as obesity and insulin resistance. In humans, there are two main sites of adipose tissue accumulation: visceral and subcutaneous. Obesity is a worldwide health problem. This book also discusses a series of up-to-date topics about this pathology.
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