Lower bone cellular activities in male and female mature C3H/HeJ mice are associated with higher bone mass and different pyridinium crosslink profiles compared to C57BL/6J mice.
The female inbred strains of C3H/HeJ (C3H) and C57BL/6J mice (B6), having high and low femoral peak bone mass, respectively, were proposed as models for studying the genetic regulation of bone mass. Here, we compared the known bone phenotype, in 4.5-month-old C3H versus B6 mice, in both genders. Femoral bone mineral content, trabecular bone mass, and thickness at the distal metaphysis were higher in C3H mice. In the long bones, deoxypyridinoline content was lower and pyridinoline/deoxypyridinoline ratios were greater in C3H. Intrafibrillar collagen packing is different not only within strains but also within sexes. Bone resorption activity, evaluated by urinary pyridinium crosslinks and active resorption surfaces in the femoral metaphysis, was lower in C3H. Bone formation activity, evaluated by serum osteocalcin and alkaline phosphatase (ALP) levels, as well as histomorphometric indices of bone formation in the femoral metaphysis and the cortical tibia, was lower in C3H. Conversely, the ALP- and Von Kossa-positive colony-forming units were more numerous in bone marrow cell cultures originating from male C3H. In both strains, resorption and formation activities were lower in males than in females. In C3H, males had lower bone mass than females whereas the opposite was seen in B6. In conclusion, we found that the lower cellular activities in C3H were associated with high cancellous bone mass and pyridinium crosslink levels, which might account for the more mineralized bone in C3H mice compared to that in B6 mice.
Laboratoire de Biologie du Tissu Osseux (LBTO), GIP E2S, INSERM E0366, Faculté de Médecine, 15, rue Ambroise Paré, 42023 St. Etienne 2, France.
Daniel
D
Amblard
Marie-Hélène
MH
Lafage-Proust
Annette
A
Chamson
Aline
A
Rattner
Philippe
P
Collet
Christian
C
Alexandre
Laurence
L
Vico
D000596:Amino Acids / Q000032:analysis* / Q000652:urine; D000818:Animals; D015415:Biomarkers / Q000097:blood; D015519:Bone Density; D001854:Bone Marrow Cells / Q000166:cytology; D001842:Bone and Bones / Q000033:anatomy & histology* / Q000737:chemistry; D005260:Female; D005269:Femur / Q000166:cytology; D008297:Male; D051379:Mice; D008809:Mice, Inbred C3H / Q000033:anatomy & histology; D008810:Mice, Inbred C57BL / Q000033:anatomy & histology; D008817:Mice, Mutant Strains; D023421:Models, Animal; D010006:Osteoblasts / Q000166:cytology; D013977:Tibia / Q000166:cytology
D000596:Amino Acids; D015415:Biomarkers; C015484:pyridinoline