Circulating Irisin Levels Are Not Regulated by Nutritional Status, Obesity, or Leptin Levels in Rodents

Irisin is a cleaved and secreted fragment of fibronectin type III domain containing 5 (FNDC5) that is mainly released by skeletal muscle and was proposed to mediate the beneficial effects of exercise on metabolism. In the present study we aim to investigate the regulation of the circulating levels of irisin in obese animal models (diet-induced obese (DIO) rats and leptin-deficient (ob/ob) mice), as well as the influence of nutritional status and leptin. Irisin levels were measured by Enzyme-Linked Immunosorbent Assay (ELISA) and Radioimmunoassay (RIA). Serum irisin levels remained unaltered in DIO rats and ob/ob mice. Moreover, its circulating levels were also unaffected by fasting, leptin deficiency, and exogenous leptin administration in rodents. In spite of these negative results we find a negative correlation between irisin and insulin in DIO animals and a positive correlation between irisin and glucose under short-term changes in nutritional status. Our findings indicate that serum irisin levels are not modulated by different physiological settings associated to alterations in energy homeostasis. These results suggest that in rodents circulating levels of irisin are not involved in the pathophysiology of obesity and could be unrelated to metabolic status; however, further studies should clarify its precise role in states of glucose homeostasis imbalance.Xunta de GaliciaIDISGobierno de España/Ministerio de Economía y CompetitividadInstituto de Salud Carlos III (ISCIII

Psychosomatic Approach to Fibromyalgia Syndrome: Medical, Psychological, and Social Aspects

Management of patients who describe chronic pain all over the body, associated with a range of symptoms as sleep disturbance, overwhelming fatigue, alteration in mood, or psychological distress that worsens the quality of life, is often complex and challenging. This syndrome has been named by terms such as “neurasthenia,” “fibrositis,” and “fibromyalgia”. At the present time, fibromyalgia is considered the most common central sensitivity syndrome, affecting over 5% of the population, being often observed in people with rheumatic conditions. While typically presenting in middle-aged women, fibromyalgia can affect both sexes at any age. The causes of fibromyalgia remain unknown. Significant research findings have focused on dysfunction of central pain processing, with defects in the ascending and descending pain pathways leading to increased pain perception. There are two methods used in the diagnosis of fibromyalgia: criteria-based diagnosis and clinical diagnosis. Although fibromyalgia defies definitively efficacious management, much evidence underlies the importance of treating the psychological factors that affect pain management process. The primary purpose of this paper is to provide a psychosomatic approach to fibromyalgia from three points of view of processing: the viewpoint of the medical profession, the position of the psychologist, and finally the way of thinking of people

Storytelling as a Therapeutic Tool for Family Support in Bulimia Nervosa

Telling stories (storytelling) is, above and beyond, a form of communication. It is a natural, universal, and well-known way of interaction among human beings. Storytelling, orally as well as in writing, is the sharing of personal narratives, a sort of story-sharing. With regard to chronic disease self-management, storytelling has been reported to be an exciting approach to patients and families. In this regard, families are considered very important in the management and treatment of eating disorders. Living with an eating disorder is an experience which deserves to be expressed in order to improve emotional support always necessary for patients’ families. Bearing in mind that eating disorders can be chronic illnesses that lead to challenging and troublesome experiences for patients and their families, this chapter aims to think over the everyday interactions that typify family life in the context of eating disorders and specifically in the case of bulimia nervosa. We propose this text as a reflection based on different experiences when working with bulimic patients

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Circulating irisin levels are not regulated by nutritional status, obesity, or leptin levels in rodents

Irisin is a cleaved and secreted fragment of fibronectin type III domain containing 5 (FNDC5) that is mainly released by skeletal muscle and was proposed to mediate the beneficial effects of exercise on metabolism. In the present study we aim to investigate the regulation of the circulating levels of irisin in obese animal models (diet-induced obese (DIO) rats and leptin-deficient (ob/ob) mice), as well as the influence of nutritional status and leptin. Irisin levels were measured by Enzyme-Linked Immunosorbent Assay (ELISA) and Radioimmunoassay (RIA). Serum irisin levels remained unaltered in DIO rats and ob/ob mice. Moreover, its circulating levels were also unaffected by fasting, leptin deficiency, and exogenous leptin administration in rodents. In spite of these negative results we find a negative correlation between irisin and insulin in DIO animals and a positive correlation between irisin and glucose under short-term changes in nutritional status. Our findings indicate that serum irisin levels are not modulated by different physiological settings associated to alterations in energy homeostasis. These results suggest that in rodents circulating levels of irisin are not involved in the pathophysiology of obesity and could be unrelated to metabolic status; however, further studies should clarify its precise role in states of glucose homeostasis imbalance.Mar Quiñones is a recipient of a Postdoctoral Fellowship from Galician Government (Xunta de Galicia ED481B2014/039-0). Cintia Folgueira is funded by IDIS. Estrella Sánchez-Rebordelo is a fellowship of the Ministerio de Economia y Competitividad (ref: BES-2013-062796). Omar Al-Massadi is funded by the ISCIII/SERGAS thought a research contract “Sara Borrell” (CD14/00091)S

Hypothalamic Actions of SIRT1 and SIRT6 on Energy Balance

Sirtuins are NAD+ dependent deacetylases that regulate a large number of physiological processes. These enzymes are highly conserved and act as energy sensors to coordinate different metabolic responses in a controlled manner. At present, seven mammalian sirtuins (SIRT 1-7) have been identified, with SIRT1 and SIRT6 shown to exert their metabolic actions in the hypothalamus, both with crucial roles in eliciting responses to dampen metabolic complications associated with obesity. Therefore, our aim is to compile the current understanding on the role of SIRT1 and SIRT6 in the hypothalamus, especially highlighting their actions on the control of energy balanceThis work is supported by grants of Xunta de Galicia (MQ:2018-PG013). Centro de Investigación Biomédica en Red (CIBER) de Fisiopatología de la Obesidad y Nutrición (CIBERobn). CIBERobn is an initiative of the Instituto de Salud Carlos III (ISCIII) of Spain which is supported by FEDER funds. Western Norway Regional Health Authority (Helse Vest RHF).M.Q. is a recipient of a Postdoctoral contract from Galician Government (Xunta de Galicia ED481B2018/004). O.A.M. was funded by a research contract Miguel Servet (CP20/00146) from the ISCIIIS

A cross population between D. kaki and D. virginiana shows high variability for saline tolerance and improved salt stress tolerance

[EN] Persimmon (Diospyros kaki Thunb.) production is facing important problems related to climate change in the Mediterranean areas. One of them is soil salinization caused by the decrease and change of the rainfall distribution. In this context, there is a need to develop cultivars adapted to the increasingly challenging soil conditions. In this study, a backcross between (D. kaki x D. virginiana) x D. kaki was conducted, to unravel the mechanism involved in salinity tolerance of persimmon. The backcross involved the two species most used as rootstock for persimmon production. Both species are clearly distinct in their level of tolerance to salinity. Variables related to growth, leaf gas exchange, leaf water relations and content of nutrients were significantly affected by saline stress in the backcross population. Water flow regulation appears as a mechanism of salt tolerance in persimmon via differences in water potential and transpiration rate, which reduces ion entrance in the plant. Genetic expression of eight putative orthologous genes involved in different mechanisms leading to salt tolerance was analyzed. Differences in expression levels among populations under saline or control treatment were found. The 'High affinity potassium transporter' (HKT1-like) reduced its expression levels in the roots in all studied populations. Results obtained allowed selection of tolerant rootstocks genotypes and describe the hypothesis about the mechanisms involved in salt tolerance in persimmon that will be useful for breeding salinity tolerant rootstocks.This study was funded by the IVIA and the European Funds for Regional Development. F. G.M.was funded by a PhD fellowship from the European Social Fund and the Generalitat Valenciana (ACIF/2016/115). The funders had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript.Gil Muñoz, F.; Pérez-Pérez, JG.; Quiñones, A.; Primo-Capella, A.; Cebolla Cornejo, J.; Forner Giner, MA.; Badenes Catala, M.... (2020). A cross population between D. kaki and D. virginiana shows high variability for saline tolerance and improved salt stress tolerance. PLoS ONE. 15(2):1-27. https://doi.org/10.1371/journal.pone.0229023S127152Visconti, F., de Paz, J. M., Bonet, L., Jordà, M., Quiñones, A., & Intrigliolo, D. S. (2015). Effects of a commercial calcium protein hydrolysate on the salt tolerance of Diospyros kaki L. cv. «Rojo Brillante» grafted on Diospyros lotus L. Scientia Horticulturae, 185, 129-138. doi:10.1016/j.scienta.2015.01.028Forner-Giner, M. A., & Ancillo, G. (2013). Breeding Salinity Tolerance in Citrus Using Rootstocks. Salt Stress in Plants, 355-376. doi:10.1007/978-1-4614-6108-1_14Visconti, F., Intrigliolo, D. S., Quiñones, A., Tudela, L., Bonet, L., & de Paz, J. M. (2017). Differences in specific chloride toxicity to Diospyros kaki cv. «Rojo Brillante» grafted on D. lotus and D. virginiana. Scientia Horticulturae, 214, 83-90. doi:10.1016/j.scienta.2016.11.025INCESU, M., CIMEN, B., YESILOGLU, T., & YILMAZ, B. (2014). Growth and Photosynthetic Response of Two Persimmon Rootstocks (Diospyros kaki and D. virginiana) under Different Salinity Levels. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 42(2), 386-391. doi:10.15835/nbha4229471De Paz, J. M., Visconti, F., Chiaravalle, M., & Quiñones, A. (2016). Determination of persimmon leaf chloride contents using near-infrared spectroscopy (NIRS). Analytical and Bioanalytical Chemistry, 408(13), 3537-3545. doi:10.1007/s00216-016-9430-2Gil-Muñoz, F., Peche, P. M., Climent, J., Forner, M. A., Naval, M. M., & Badenes, M. L. (2018). Breeding and screening persimmon rootstocks for saline stress tolerance. 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MCH regulates SIRT1/FoxO1 and reduces POMC neuronal activity to induce hyperphagia, adiposity and glucose intolerance

Melanin concentrating hormone (MCH) is an important regulator of food intake, glucose metabolism and adiposity. However, the mechanisms mediating these actions remain largely unknown. We used pharmacological and genetic approaches to show that the SIRT1/FoxO1 signaling pathway in the hypothalamic arcuate nucleus (ARC) mediates MCH-induced feeding, adiposity and glucose intolerance. MCH reduces POMC neuronal activity and the SIRT1/FoxO1 pathway regulates the inhibitory effect of MCH on POMC expression. Remarkably, the metabolic actions of MCH are compromised in mice lacking SIRT1 specifically in POMC neurons. Of note, the actions of MCH are independent of AgRP neurons because inhibition of GABA-R in the ARC did not prevent the orexigenic action of MCH; and the hypophagic effect of MCH silencing was maintained after chemogenetic stimulation of AgRP neurons. Central SIRT1 is required for MCH-induced weight gain through its actions on the sympathetic nervous system. The central MCH knockdown causes hypophagia and weight loss in diet-induced obese wild type mice, however, these effects were abolished in mice over-expressing SIRT1 fed a high fat diet. These data reveal the neuronal basis for the effects of MCH on food intake, body weight and glucose metabolism and highlight the relevance of SIRT1/FoxO1 pathway in obesity