All subjects were pubertal stage 3, as determined by a pediatrician according to the method of Marshall and Tanner (breast/genital development and pubic hair)24. == The drastic rise in pediatric obesity, combined with recent evidence suggesting that excessive fat accumulation may be associated with increased fractures in childhood13, indicates a need to understand the interplay between bone and excess fat compartments. This is particularly salient during puberty, as suboptimal bone growth coupled with excessive fat accumulation during this period has been postulated to increase osteoporosis and obesity risk later in life35. Previous research has primarily focused on dietary intake and engagement in daily physical activity as the major contributors to bone health and body fat trajectories. However, diet and physical activity have not consistently been shown to be single contributors to either the increased prevalence of obesity6,7or the increased incidence of fracture risk in the pediatric populace5,8. As such, other factors are important to explore. A growing body of evidence suggests that excessive fat accumulation leads to abnormal activation of pro-inflammatory pathways911. This is of particular interest in the growing child, as the growth process itself is usually associated with some degree of inflammation12. The additional insult of increased inflammation due to obesity may compromise other aspects of growth (i.e. bone mass accrual). Accordingly, obesity may exacerbate inflammatory pathways Cambinol and inhibit bone mineralization, thereby leading to increased incidence of skeletal fractures in childhood. Adipose tissue is usually a well-established source of various markers of inflammation (MOI) such as interleukin-6 (IL-6) and tumor necrosis factor (TNF), and increased adiposity has been shown to be associated with both systemic inflammation and bone integrity in adults5,10,11,13,14. Further, elevated inflammation stimulates osteoclastic activity15and is usually associated with lower bone mineral density in adults9,16. Indeed, many inflammatory markers have catabolic properties, and a reduction in osteoblast differentiation due to increased inflammation has been reportedin vitro13. We17and others12,13,18,19have also reported a positive relationship between adiposity and circulating MOI in children. However, the relation between inflammation and bone mass in children has not been thoroughly defined. The dynamic growth and development occurring throughout the pubertal transition is usually met with crucial interactions of physiologic and behavioral underlying factors. These factors may act independently or synergistically to affect body tissue partitioning (i.e. increased excess fat mass at the expense of bone mass). There is limited research regarding the secretion of MOI as mediators in the context of the interplay between excess fat and bone, particularly in the pediatric populace. The complexity of these interactions is usually augmented when considering diverse populations, as population-based differences have been consistently documented in excess fat mass and distribution as well as bone mineral content (BMC)20,21,2123. Taken together, further investigation around the mediation of the relationship between excess fat and bone by MOI is usually warranted, particularly in the pediatric populace. The main objective of the study was to evaluate the relationship among circulating MOI (i.e. CRP, TNF receptor 2/TNFR2, IL-6) and BMC and to determine if the relationship between MOI and BMC is usually moderated by excess fat deposition/distribution. We also wanted to determine if these associations differed by race/ethnicity and/or sex. Because both excess fat deposition and bone mineralization are affected by metabolic parameters (e.g. glucose/insulin homeostasis), a secondary objective was to evaluate Emr1 if insulin sensitivity mediates the relationship between MOI and BMC. == METHODS == == Subjects == Participants were 54 healthy children aged 712 y (59% males and 69% African Americans) recruited as Cambinol part of a larger cross-sectional study6. All subjects were pubertal stage 3, as determined by a pediatrician according to the method of Marshall and Tanner (breast/genital development and Cambinol pubic hair)24. Participants were recruited during 2005 via newspaper advertisements, flyers, and word-of-mouth. Participants were excluded if they had a current diagnosis of diabetes, genetic disorders known to affect body composition or excess fat distribution, glucose or lipid metabolism disturbances, and/or use of medications known to affect body composition or physical activity.. Cambinol