The age-related decrease in material properties of BALB/c mouse long bones involves alterations to the extracellular matrix
Yükleniyor...
Dosyalar
Tarih
2020
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
One possibility for the disproportionate increase in fracture risk with aging relative to the decrease in bone mass is an accumulation of changes to the bone matrix which deleteriously affect fracture resistance. In order to effectively develop new targets for osteoporosis, a preclinical model of the age-related loss in fracture resistance needs to be established beyond known age-related decreases in bone mineral density and bone volume fraction. To that end, we examined long bones of male and female BALB/c mice at 6-mo. and 20-mo. of age and assessed whether material and matrix properties of cortical bone significantly differed between the age groups. The second moment of area of the diaphysis (minimum and maximum principals for femur and radius, respectively) as measured by ex vivo micro-computed tomography (mu CT) was higher at 20-mo. than at 6-mo. for both males and females, but ultimate moment as measured by three-point bending tests did not decrease with age. Cortical thickness was lower with age for males, but higher for old females. Partially accounting for differences in structure, material estimates of yield, ultimate stress, and toughness (left femur) were 12.6%, 11.1%, and 40.9% lower, respectively, with age for both sexes. The ability of the cortical bone to resist crack growth (right femur) was also 18.1% less for the old than for the young adult mice. These decreases in material properties were not due to changes in intracortical porosity as pore number decreased with age. Rather, age-related alterations in the matrix were observed for both sexes: enzymatic and non-enzymatic crosslinks by high performance liquid chromatography increased (femur), volume fraction of bound water by H-1-nuclear magnetic resonance relaxometry decreased (femur), cortical tissue mineral density by mu CT increased (femur and radius), and an Amide I sub-peak ratio I-1670/I-1640 by Raman spectroscopy increased (tibia). Overall, there are multiple matrix changes to potentially target that could prevent the age-related decrease in fracture resistance observed in BALB/c mouse.
Açıklama
WOS:000503321100030
Anahtar Kelimeler
Bone Quality, Toughness, Bound Water, Advanced Glycation End-Products, Collagen, Raman Spectroscopy
Kaynak
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
130
Sayı
Künye
Creecy, A., Uppuganti, S., Girard, M. R., Schlunk, S. G., Amah, C., Granke, M., Unal, M., ... Nyman, J. S. ( 2020). The age-related decrease in material properties of BALB/c mouse long bones involves alterations to the extracellular matrix. Bone, 130.
