Serum inorganic phosphate (Pi) levels are higher in children than in adults; however, the underlying mechanisms remain unclear. Therefore, we herein attempted to elucidate the mechanisms altering Pi metabolism from youth to adulthood using 4-week-old (young) and 12-week-old (adult) mice. Despite higher serum Pi levels, serum fibroblast growth factor 23 (FGF23) levels were lower in young mice, and the amount of FGF23 in bone tended to increase from youth to adulthood. Increases in serum FGF23 levels during growth were associated with the up- and down-regulation of the renal expression of Cyp24a1 encoding vitamin D-24-hydroxylase and Slc34a3 encoding the type IIc sodium/phosphate (Na/Pi) co-transporter, respectively, suggesting an enhancement in the FGF23-mediated bone-kidney axis from youth to adulthood. We then isolated osteoblasts and osteocytes from young and adult mice and compared the expression of genes involved in Pi metabolism and/or mineralization. In contrast to the growth-related increase in Fgf23 expression, the expression of some genes, including the dentin matrix protein 1 (Dmp1) and phosphate-regulating gene with homologies to endopeptidases on the X chromosome (Phex) markedly decreased from youth to adulthood. The down-regulation of Dmp1 and Phex may contribute to growth-related increases in FGF23. The responses of isolated osteoblasts and osteocytes to high Pi levels also markedly differed between young and adult mice. Treatment of isolated osteocytes with high Pi increased the production of FGF23 in adult mice but not in young mice. These results indicate a close relationship between skeletal changes from youth to adulthood and an alteration in Pi metabolism, and provide insights into the mechanisms by which osteoblasts and osteocytes maintain Pi homeostasis.
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http://dx.doi.org/10.1016/j.bone.2022.116430 | DOI Listing |
Trials
January 2025
INSERM, Regenerative Medicine and Skeleton, RMeS, CHU Nantes, Nantes Université, UMR 1229, Nantes, 44000, France.
Background: Cleft lip and/or palate is the most common congenital orofacial deformity, affecting 1/800 births. A thorough review of the literature has shown that children with cleft have poorer oral hygiene and dental health than other children, with higher levels of caries in both temporary and permanent teeth and poorer periodontal health. Cleft patients are treated by a multidisciplinary team that aims to provide comprehensive care from pre- or post-natal diagnosis to early adulthood and the end of growth.
View Article and Find Full Text PDFPsychoneuroendocrinology
December 2024
Laboratory of Psychiatric Neuroscience, Australian Institute of Tropical Health and Medicine, James Cook University, Townsville, Queensland, Australia; College of Medicine and Dentistry, James Cook University, Queensland, Australia. Electronic address:
Background: It has been well-established that the allostatic load (AL) index, a cumulative score of multi-system dysregulation in response to chronic stress, is significantly increased at the time of a psychiatric diagnosis. However, no studies have investigated if there is an association between the AL index in childhood and the later development of mental health symptoms in young adults.
Methods: Using data from the Avon Longitudinal Study of Parents and Children (ALSPAC), a population cohort from Bristol, United Kingdom, we investigated the AL index at age 9 years and the risks for mental health symptoms at age 24 years.
PLoS One
January 2025
Department of Acupuncture and Moxibustion, The Third Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, China.
Introduction: Generalized anxiety disorder (GAD) is the most common type of anxiety disorders. GAD usually occurs in adolescence or early adulthood, and the prevalence of GAD is higher among college-enrolled young adults than in the general adult population. However, there is a lack of evidence regarding the effectiveness of acupuncture in the treatment of GAD.
View Article and Find Full Text PDFJ Exp Psychol Hum Percept Perform
January 2025
Department of Psychology, Rutgers University, Newark.
Growing evidence highlights the predictive power of cross-notation magnitude comparison (e.g., 2/5 vs.
View Article and Find Full Text PDFBackground: Neurodevelopmental origins of functional variation through the lifespan are acknowledged, but pathways need to be identified. The objectives of the project Set-to-change is to test whether and how early life environmental factors and genetic makeup regulate brain and cognition and its change, as well as neurocognitive plasticity in response to training through the lifespan.
Method: Preliminary analyses for the first months are presented.
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