Pre-adipocytes are the precursors with the potential to make new fat cells during adipose tissue expansion. Nevertheless, the pre-adipocytes behaviors, and their possible roles in energy homeostasis have long been overlooked. Our previous study implicates that interleukin-4 (IL-4) plays a positive metabolic role by promoting insulin sensitivity and inhibiting lipid accumulation. Besides, abundant evidence shows the involvement of matrix metalloproteinase-2 (MMP-2) in the process of adipose tissue expansion. The present study aimed at examining the cross talk among glucose, insulin and IL-4 on regulating MMP-2 expression and activity in 3T3-L1 pre-adipocytes. Effects of insulin and/or IL-4 on MMP-2 expression and activity were examined in pre-adipocytes under euglycemic or hyperglycemic environment by RT-PCR and gelatin zymography, respectively. Our results revealed that glucose level is a pre-requisite for pre-adipocytes responding to insulin and/or IL-4 treatment. In high glucose-containing environment, short-term acute insulin treatment (AI) and long-term chronic insulin exposure (CI) showed opposite regulation to MMP-2 expression and activity. Interestingly, the dominant MMPs regulatory role of CI under euglycemic condition was attenuated in cells exposed to high glucose concentration. Our results suggest pre-adipocytes may participate in the process of increasing adiposity, diabetic onset and diabetic complications through ECM alterations resulted from the insulin- and/or glucose- mediated changes of MMP-2 activity. The present study uncovers novel observations regarding pre-adipocytes behaviors.  Show less

Orthorexia Nervosa (ON) describes a pathological, unhealthy fixation with eating healthy food. This study intends to further understand ON and its possible link to the use of social media, and specifically, to test the prevalence of ON in an opportunity sample with the use of two ON measures – the ORTO-15 and the Tereul Orthorexia Scale (TOS); to use and validate a new ON measure (TOS); to examine the relationship between ON and social media use, with a focus on Instagram users; and to further understand the participants’ interpretations of the possible link between eating patterns and social media use. This study uses a convergent design and a mixed methods approach, which employs both statistical and thematic analysis (TA). Data from 201 participants suggested a high prevalence of ON across the sample, and the results also reinforced the validity of the TOS measure (α = .86). ORTO-15 scores showed significant differences between age groups, genders, and Instagram users and non-Instagram users. The TA generated three overall themes: ‘The Importance of Belonging’, ‘Health as Art’ and ‘Craving’. The high prevalence in the sample may have been a result of the researcher’s recruitment method, and the ON measures may have categorised individuals on non-medically prescribed diets as ‘orthorexic’. Both the quantitative and qualitative results offer evidence to support a possible link between ON and social media use, specifically Instagram. Further research should be done to establish official criteria and measures for ON and the effect of social media on eating patterns. Show less

Background Osteoarthritis, a serious and increasingly prevalent disabling global health condition found largely among older adults, has been linked to the presence of excess body weight. But what contributes to this growing health epidemic of excess weight, which is increasingly observed in children? Moreover, can a case be made for predicting a possible negative linkage between the pervasive use of social media from the earliest point in time and possible subsequent childhood overweight or obesity and late life osteoarthritis that may be amenable to intervention? Methods To examine the most probable answers to these questions, the EBSCO, Scopus and PUBMED data bases were sourced for relevant data. The extracted data were carefully reviewed, categorized and documented in narrative format. Results While one cannot readily carry out research to answer the above questions, prevailing data imply that there is more risk of being overweight in childhood, as well as acquiring possible later life disabling osteoarthritis, or a more serious manifestation of this disease, through the prolonged, unfettered and frequent use of social media in early and middle childhood. Conclusion Those in the realm of developing preventive strategies against childhood overweight or obesity as well as osteoarthritis are strongly encouraged to examine the role of the media environment and messages children are exposed early on in this regard. Alternately, children who already have disabilities, joint pain due to arthritis or other health conditions, and who may have to rely more on social media than others who are active- may suffer more readily from an energy imbalance and become overweight if due precautions against this are not taken. Show less