Proteomics of Bone Formation in Young-Adult and Old Mice

BUFFALO, NY- October 15, 2024 – A new #research paper was #published on the #cover of Aging (listed by MEDLINE/PubMed as "Aging (Albany NY)" and "Aging-US" by Web of Science), Volume 16, Issue 19 on October 12, 2024, entitled, “A proteomics approach to study mouse long bones: examining baseline differences and mechanical loading-induced bone formation in young-adult and old mice.” As noted in the abstract, bone mass declines with age, and the anabolic effects of skeletal loading decrease. While much research has focused on gene transcription, how bone ages and loses its mechanoresponsiveness at the protein level remains unclear. In their paper, researchers Christopher J. Chermside-Scabbo, John T. Shuster, Petra Erdmann-Gilmore, Eric Tycksen, Qiang Zhang, R. Reid Townsend, and Matthew J. Silva from Washington University School of Medicine and Washington University in St. Louis, Missouri, describe how they developed a novel proteomics approach and conducted paired mass spectrometry and RNA-seq analyses on tibias from young-adult (5-month) and old (22-month) mice. The researchers report the first correlation estimate between the bone proteome and transcriptome (Spearman ρ = 0.40). While this is consistent with findings from other tissues, it suggests that only a relatively low amount of variation in protein levels is explained by variation in transcript levels. Of the 71 shared targets that differed with age, eight were associated with bone mineral density in previous GWAS, including the understudied targets Asrgl1 and Timp2. Using complementary RNA in situ hybridization, the researchers confirmed that Asrgl1 and Timp2 showed reduced expression in osteoblasts/osteocytes in aged bones. Additionally, they found evidence of reduced TGF-beta signaling with aging, particularly Tgfb2. The researchers also identified proteomic changes following mechanical loading, noting that at the protein level, bone differed more with age than with loading, and aged bone exhibited fewer loading-induced changes. "Overall, our findings underscore the need for complementary protein-level assays in skeletal biology research.” DOI - https://doi.org/10.18632/aging.206131 Corresponding author - Christopher J. Chermside-Scabbo - ccherms@wustl.edu Video short - https://www.youtube.com/watch?v=xm6o7gWH8p4 Sign up for free Altmetric alerts about this article - https://aging.altmetric.com/details/email_updates?id=10.18632%2Faging.206131 Subscribe for free publication alerts from Aging - https://www.aging-us.com/subscribe-to-toc-alerts Keywords - aging, bone, mechanical loading, proteomics, RNA-seq/transcriptomics About Aging-US The mission of the journal is to understand the mechanisms surrounding aging and age-related diseases, including cancer as the main cause of death in the modern aged population. The journal aims to promote 1) treatment of age-related diseases by slowing down aging, 2) validation of anti-aging drugs by treating age-related diseases, and 3) prevention of cancer by inhibiting aging. (Cancer and COVID-19 are age-related diseases.) Please visit our website at https://www.Aging-US.com​​ and connect with us: Facebook - https://www.facebook.com/AgingUS/ X - https://twitter.com/AgingJrnl Instagram - https://www.instagram.com/agingjrnl/ YouTube - https://www.youtube.com/@AgingJournal LinkedIn - https://www.linkedin.com/company/aging/ Pinterest - https://www.pinterest.com/AgingUS/ Spotify - https://open.spotify.com/show/1X4HQQgegjReaf6Mozn6Mc MEDIA@IMPACTJOURNALS.COM