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The adipose tissue stroma is a rich source of molecularly distinct stem and progenitor cell populations with diverse functions in metabolic regulation, adipogenesis, and inflammation. The ontology of these populations and the mechanisms that govern their behaviors in response to stimuli, such as overfeeding, however, are unclear. Here, we show that the developmental fates and functional properties of adipose platelet-derived growth factor receptor beta (PDGFRβ)+ progenitor subpopulations are tightly regulated by mitochondrial metabolism. Reducing the mitochondrial β-oxidative capacity of PDGFRβ+ cells via inducible expression of MitoNEET drives a pro-inflammatory phenotype in adipose progenitors and alters lineage commitment. Furthermore, disrupting mitochondrial function in PDGFRβ+ cells rapidly induces alterations in immune cell composition in lean mice and impacts expansion of adipose tissue in diet-induced obesity. The adverse effects on adipose tissue remodeling can be reversed by restoring mitochondrial activity in progenitors, suggesting therapeutic potential for targeting energy metabolism in these cells.

It has now been *20 years since the original Lymphatic Continuum conference was convened, and this continuum has transitioned from a compelling concept to a reality. The explosive growth in our comprehension of lymphatic genetics, development, and function has expanded and modified our traditional views regarding what is, and is not, lymphatic disease. Groundbreaking investigations over the past decade have now defined a large and growing list of pathological conditions in which morphological or function lymphatic alterations can be identified. This list includes atherosclerosis and dyslipidemia, hypertension and other cardiovascular diseases, inflammation and inflammatory bowel disease, obesity, narrow angle glaucoma, and, most recently and compellingly, neurodegenerative disease. The sometimes overlapping but largely disparate nature of these various aforementioned disease categories suggests that the presence, or absence, of structural or functional lymphatic derangements may represent a previously unrecognized unifying influence in the maintenance of health and the promotion of disease. Future investigation of lymphatic mechanisms in disease will likely continue to elucidate the influences of lymphatic dysfunction, perhaps subtle, that can invest other, seemingly unrelated, diseases. In future, such discoveries will provide mechanistic insights and may potentiate the development of a new lymphatic-based approach to human disease diagnosis and therapeutics.

PURPOSE OF REVIEW: Williams syndrome is a multisystem disorder caused by a microdeletion on chromosome 7q. Throughout infancy, childhood, and adulthood, abnormalities in body composition and in multiple endocrine axes may arise for individuals with Williams syndrome. This review describes the current literature regarding growth, body composition, and endocrine issues in Williams syndrome with recommendations for surveillance and management by the endocrinologist, geneticist, or primary care physician. RECENT FINDINGS: In addition to known abnormalities in stature, calcium metabolism, and thyroid function, individuals with Williams syndrome are increasingly recognized to have low bone mineral density, increased body fat, and decreased muscle mass. Furthermore, recent literature identifies a high prevalence of diabetes and obesity starting in adolescence, and, less commonly, a lipedema phenotype in both male and female individuals. Understanding of the mechanisms by which haploinsufficiency of genes in the Williams syndrome-deleted region contributes to the multisystem phenotype of Williams syndrome continues to evolve. SUMMARY: Multiple abnormalities in growth, body composition, and endocrine axes may manifest in individuals with Williams syndrome. Individuals with Williams syndrome should have routine surveillance for these issues in either the primary care setting or by an endocrinologist or geneticist.

Background: Lack of diagnostic awareness of lipedema and frequent confusion with obesity or lymphedema may be an obstacle for treatment. The clinical effects of conservative treatment methods are not clearly known. This study investigated the effects of exercise-based rehabilitation combined with complete decongestive therapy (CDT) or intermittent pneumatic compression therapy (IPCT) or alone in patients with severe lipedema. Methods: Thirty-three women with severe (type 3, stage III or IV) lipedema diagnosed according to the revised-Wold criteria were randomized into three groups: Group 1 (CDT plus exercises), Group 2 (IPCT plus exercises), and Group 3 (control-exercises alone). All groups received 30 sessions of combined (aerobic, strengthening, and stretching) exercise program. In addition, there were CDT in Group 1 and IPCT in Group 2 five times a week for 6 weeks. The primary outcome measure was the limb volume measurements. The secondary outcome measures were anthropometric measurements (body weight, body mass index, waist-to-height ratio, waist-to-hip ratio), 6-minute walk test, visual analog scale for pain, fatigue severity scale, Beck Depression Inventory, and Short Form Health Survey-36 (SF-36). Results: Thirty-one participants completed the interventions. Limb volumes (p = 0.017, ηp2 = 0.562 for right; p < 0.001, ηp2 = 0.775 for left), pain (p = 0.045, ηp2 = 0.199), and physical functioning subscore of SF-36 (p = 0.040, ηp2 = 0.465) differed significantly between treatments originating from Group 1. Conclusions: All programs improved outcome measurements after the intervention. However, when the difference between treatments was investigated, CDT administered in addition to the exercises has been shown to provide significant improvements in reducing limb volumes, pain, and physical function. Clinical trial registration number: The study was registered at the US National Institutes of Health (ClinicalTrials.gov) (NCT03924999) and available at https://clinicaltrials.gov/ct2/show/NCT03924999?term=lipedema&draw=2&rank=6.

Background: The aim of this study is to investigate the effect of complex decongestive physiotherapy (CDP) plus intermittent pneumatic compression (IPC) applications on lower extremity limb circumference and volume in patients with lipedema. Methods and Results: In measurement of limb volume and circumference measurement, the Perometer 400 NT was used before and after treatment. The perometer measurements in this study were performed in the certain five reference points (cB, cC, cD, cE, and CF). All participants included in the study were included in a treatment protocol consisting of CDP and IPC. It was seen that statistically significant reduction was found in the circumference of 3 of the 5 points of measurements performed in the left limb, whereas statistically significant reduction was found in the circumference of 4 of the 5 points of measurements performed in the right limb. When the assessments of limb volume performed with the perometer were compared before and after CDP, it was seen that statistically significant reduction was found in the volume of both limbs. Conclusion: This reduction indicates that CDP is effective in the treatment of lower extremity lipedema. Clinicaltrials.gov with an ID of NCT04492046.

Many drugs are responsible, through different mechanisms, for peripheral edema. Severity is highly variable ranging from slight edema of the lower limbs to anasarca pictures as in the capillary leak syndrome. Although most often non-inflammatory and bilateral, some drugs are associated with peripheral edema that is readily erythematous (e.g., pemetrexed) or unilateral (e.g., sirolimus). Thus, drug-induced peripheral edema is underrecognized and misdiagnosed, frequently leading to a prescribing cascade. Four main mechanisms are involved, namely precapillary arteriolar vasodilation (vasodilatory edema), sodium/water retention (renal edema), lymphatic insufficiency (lymphedema) and increased capillary permeability (permeability edema). The underlying mechanism has significant impact on treatment efficacy. The purpose of this review is to provide a comprehensive analysis of the main causative drugs by illustrating each pathophysiological mechanism and their management through an example of drug.

Significance: Primary lymphedema is a chronic condition without a cure. The lower extremities are more commonly affected than the arms or genitalia. The disease can be syndromic. Morbidity includes decreased self-esteem, infections, and reduced function of the area. Recent Advances: Several mutations can cause lymphedema, and new variants continue to be elucidated. A critical determinant that predicts the natural history and morbidity of lymphedema is the patient's body mass index (BMI). Individuals who maintain an active lifestyle with a normal BMI generally have less severe disease compared to subjects who are obese. Because other causes of lower extremity enlargement can be confused with lymphedema, definitive diagnosis requires lymphoscintigraphy. Critical Issues: Most patients with primary lymphedema are satisfactorily managed with compression regimens, exercise, and maintenance of a normal body weight. Suction-assisted lipectomy is our preferred operative intervention for symptomatic patients who have failed conservative therapy. Suction-assisted lipectomy effectively removes excess subcutaneous fibro-adipose tissue and can improve underlying lymphatic function. Future Directions: Many patients with primary lymphedema do not have an identifiable mutation and thus novel variants will be identified. The mechanisms by which mutations cause lymphedema continue to be studied. In the future, drug therapy for the disease may be developed.

Lipoedema is a subcutaneous adipose tissue disease characterized by the increase in the amount and structure of fat mass (FM) in specific areas, causing pain and discomfort. 95% of patients fail to lose weight in the lipoedema areas. The study was conducted to evaluate body composition and general health status modification in a group of lipoedema patients (LIPPY) and a control group (CTRL) after four weeks of a modified Mediterranean diet therapy (mMeD). A total of 29 subjects were included in the data analysis, divided in two groups: 14 LIPPY and 15 CTRL. After the mMeD, both groups significantly decreased their weight and body mass index; the CTRL also showed a reduction of all the circumferences and all FM's compartments. LIPPY showed a decrease of FM in upper and lower limbs. No significant differences in Δ% between the groups were observed for the lean mass (LM). In LIPPY, an increase in the patients' ability to perform various daily physical activities related to the loss of arms' and legs' fat was observed. According to the European Quality of Life scale, the possibility for LIPPY subjects to perform simple daily activities with less fatigue, pain and anxiety is highlighted. Further long-term studies are recommended to confirm the mMeD as a good strategy for Lipoedema treatment.

Lipedema is a type of subcutaneous adipose tissue disorder that affects mainly women. Its main symptom is bilateral fat accumulation on the extremities with associated pain in the affected areas. Despite growing interest in lipedema among patients and medical health professionals, lipedema is still often misdiagnosed, misunderstood, and mistreated. To promote better understanding of lipedema, we aimed to investigate factors related to the quality of life and describe selected sociodemographic and clinical characteristics of women with lipedema in Poland.

Resumen Introducción El lipedema es el depósito de tejido graso doloroso fundamentalmente en miembros inferiores. Afecta casi siempre a mujeres, y está infradiagnosticado e infratratado. El objetivo del estudio es describir las características del diagnóstico y los tipos de tratamientos realizados por los pacientes con lipedema en España. Material y métodos Estudio descriptivo transversal mediante encuesta online anónima realizada entre noviembre-diciembre 2019. Se calculó el tamaño muestral mínimo para un nivel de confianza del 95% y margen de error del 5%. Se recogieron las variables sociodemográficas (edad, sexo y comunidad de residencia), aspectos diagnósticos y la mejoría percibida con diferentes opciones de tratamiento. Resultados Se obtuvieron 463 respuestas válidas. La edad media de inicio de la sintomatología fue de 18,2 años (DE: 9,0). El 69% de los pacientes comenzaron con clínica entre los 10-19 años. Transcurrieron 19,9 años (DE: 10,1) desde el inicio de la clínica, y se necesitaron 4,9 visitas médicas (DE: 3,3) para obtener un diagnóstico. El diagnóstico se realizó con más frecuencia en la medicina privada por cirujanos. El 78,4% de los pacientes probaron, al menos, 3 tipos diferentes de tratamientos. La pérdida de peso fue el tratamiento más utilizado y las prendas de compresión la opción percibida como más efectiva. Un 34% de los pacientes tienen acceso a la prescripción de prendas de compresión. Conclusiones Actualmente el lipedema carece de un tratamiento estandarizado, y las diferentes terapias realizadas no son percibidas como satisfactorias por los pacientes. Es necesario mejorar su conocimiento para obtener un diagnóstico temprano y proporcionar a los pacientes tratamientos adecuados. Introduction Lipedema is a chronic and progressive disease. Most studies agree that it is underdiagnosed and undertreated. The aim of this study was to identify the diagnostic characteristics and types of treatment for lipedema in the Spanish population. Material and methods A cross-sectional descriptive study was carried out through an anonymous 10-item online survey in November- December 2019. The minimum sample size was calculated for a 95% confidence level and 5% margin of error. Information was collected on sociodemographic variables (age, sex, place of residence), diagnostic characteristics and perceived improvement with distinct treatment options. Results A total of 463 valid responses were obtained. The mean age at first manifestation was 18.2 (SD: 9.0) years. Onset occurred between the ages of 10 and 19 years in 69% of the patients. It took an average of 19.9 (SD: 10.1) years to receive a diagnosis and 4.9 medical visits. Diagnosis was most frequently made in private clinics by surgeons. Most patients (78.4%) had tried at least three different types of treatment. Weight loss was the most frequent treatment (92%) and compression garments were perceived to be the most effective. Only 34% of respondents had access to financing for compression garments. Conclusions Currently, there is no standard treatment for lipedema and patients perceive current treatments to be unsatisfactory. Better knowledge of this entity is needed to allow early diagnosis and provide adequate treatment.

Primary lymphedema is a rare chronic pathology associated with constitutional abnormalities of the lymphatic system. The objective of this French National Diagnosis and Care Protocol (Protocole National de Diagnostic et de Soins; PNDS), based on a critical literature review and multidisciplinary expert consensus, is to provide health professionals with an explanation of the optimal management and care of patients with primary lymphedema. This PNDS, written by consultants at the French National Referral Center for Primary Lymphedema, was published in 2019 (https://has-sante.fr/upload/docs/application/pdf/2019-02/pnds_lymphoedeme_primaire_final_has.pdf). Primary lymphedema can be isolated or syndromic (whose manifestations are more complex with a group of symptoms) and mainly affects the lower limbs, or, much more rarely, upper limbs or external genitalia. Women are more frequently affected than men, preferentially young. The diagnosis is clinical, associating mild or non-pitting edema and skin thickening, as confirmed by the Stemmer’s sign (impossibility to pinch the skin on the dorsal side or the base of the second toe), which is pathognomonic of lymphedema. Limb lymphoscintigraphy is useful to confirm the diagnosis. Other causes of swelling or edema of the lower limbs must be ruled out, such as lipedema. The main acute lymphedema complication is cellulitis (erysipelas). Functional and psychological repercussions can be major, deteriorating the patient’s quality of life. Treatment aims to prevent those complications, reduce the volume with low-stretch bandages, then stabilize it over the long term by exercises and wearing a compression garment. Patient education (or parents of a child) is essential to improve observance.

Lipedema is a painful, underdiagnosed adipose tissue disorder, characterized by symmetrical swelling of the extremities due to subcutaneous fat deposition in the buttocks, thighs, legs, and arms, sparing the most distal part of the extremities. Although etiology and pathogenesis of lipedema is unclear, possible role of hormonal and genetic factors have been proposed previously. Patients with lipedema suffer from pain, easy bruising, tenderness, and disfigurement. Pain is the leading symptom in lipedema. Since the pain is associated with depression and impaired quality of life, reduction of pain is the major therapeutic approach. Pain in lipedema is attributed to allodynia, exaggerated sympathetic signaling, and estrogens. Although the mechanism of pain in lipedema is uncertain, effective treatment of lipedema should provide a satisfactory pain reduction. Efficacy of the conservative treatment is a matter of debate. Microcannular tumescent liposuction is the most effective therapeutic option for lipedema. There is a large body of evidence that this procedure significantly reduces pain in patients with lipedema.

Lipedema is an adipose tissue disorder characterized by the disproportionate increase of subcutaneous fat tissue in the lower and/or upper extremities. The underlying pathomechanism remains unclear and no molecular biomarkers to distinguish the disease exist, leading to a large number of undiagnosed and misdiagnosed patients. To unravel the distinct molecular characteristic of lipedema we performed lipidomic analysis of the adipose tissue and serum of lipedema versus anatomically- and body mass index (BMI)-matched control patients. Both tissue groups showed no significant changes regarding lipid composition. As hyperplastic adipose tissue represents low-grade inflammation, the potential systemic effects on circulating cytokines were evaluated in lipedema and control patients using the Multiplex immunoassay system. Interestingly, increased systemic levels of interleukin 11 (p = 0.03), interleukin 28A (p = 0.04) and interleukin 29 (p = 0.04) were observed. As cytokines can influence metabolic activity, the metabolic phenotype of the stromal vascular fraction was examined, revealing significantly increased mitochondrial respiration in lipedema. In conclusion, despite sharing a comparable lipid profile with healthy adipose tissue, lipedema is characterized by a distinct systemic cytokine profile and metabolic activity of the stromal vascular fraction.

Objective: To examine the common and specific characteristics of fibromyalgia and lipe­ dema, two chronic soft-tissue pain syndromes without curative therapy options. Methods: Diseases’ characteristics were compared using the findings of extensive literature and the empiric data from two cohorts, both fulfilling standardized diagnostic criteria. Outcome was measured by various socio-demographics, the generic Short Form 36 (SF36), the Fibromyalgia Severity Questionnaire (FSQ), and the 6-minute walk distance (6MWD). Empiric SF-36 data were compared to specific population-based norms and between the diagnostic groups, using standardized mean differences (SMD). Results: Female participants with fibromyalgia (n = 77) and lipedema (n = 112) showed comparable education levels and living situations. Lipedema cases were, on average, 3.9 years younger and BMI 6.3kg/m2 more obese. Women with fibromyalgia smoked more, did less sport, had more comorbidities, and worked less. Compared to the norms, health in fibromyalgia was worse than expected by SMD = –1.60 to –2.35 and in lipedema by –0.44 to –0.82 on the SF-36. The score differences between the two conditions ranged from SMD = –0.96 to –1.34 (all p < 0.001) on the SF-36 and the FSQ. For the inpatients (n = 77 fibromyalgia, n = 38 lipedema), the 6MWD was comparable (SMD = –0.09, p = 0.640). These findings were consistent with detailed data from the literature reviewed. Discussion: Fibromyalgia and lipedema share characteristics of clinical phenomenology and comorbid conditions. Disease perception is more pronounced in fibromyalgia than in lipe­dema, especially in social and role dysfunction, whereas the walking distance was similar for both syndromes. This difference may be explicable by limited coping skills in fibromyalgia.