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Bone mineral metabolism in T lymphocyte-deficient and -replete strains of rat.
- Source :
-
Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research [J Bone Miner Res] 1995 Oct; Vol. 10 (10), pp. 1556-65. - Publication Year :
- 1995
-
Abstract
- The immune and skeletal systems are known to interact. We have repeatedly shown that in contrast to in vitro data, the administration of T lymphocyte immunosuppressants, such as cyclosporin A, leads to an increase in bone resorption and a high turnover osteopenia. The purpose of this study was to characterize the bone metabolism of the T lymphocyte deficient Rowett athymic homozygous (rnu/rnu) nude rat. We wished to determine whether these rats share the bone abnormalities of cyclosporin A-treated rats. Eleven 10-week-old Sprague-Dawley rats and 12 similarly aged nude rats were studied over a 4-week period. Metaphyseal cancellous bone histomorphometry was similar in the two groups of rats and only differed with regard to percentage eroded perimeter (lower in nude rats, p = 0.0008) and longitudinal growth rate (49% lower in nude rats, p < 0.001). The nude rats had less body mass (p < 0.001) but nevertheless gained the same percentage of their body weight over the study period. The athymic rats had lower levels of serum, 1,25-dihydroxyvitamin D (p < 0.014) and serum osteocalcin(p < 0.009), and at the age of 14 weeks the nude rats had lower concentrations of serum creatinine (p = 0.001) and blood ionized calcium (p = 0.0002), yet serum PTH was similar throughout. RNA isolated from the contralateral tibias revealed that the nude group had lower steady-state levels of osteocalcin mRNA despite similar rates of bone formation. In its entirety, the data suggest that T cell deficiency per se is not necessarily associated with high turnover osteopenia.
- Subjects :
- Animals
Blood Glucose analysis
Blood Urea Nitrogen
Body Weight physiology
Bone Development
Bone and Bones anatomy & histology
Calcitriol
Creatinine blood
Lymphopenia metabolism
Male
Osteocalcin blood
Parathyroid Hormone blood
Rats
Rats, Nude
Rats, Sprague-Dawley
T-Lymphocytes pathology
Bone Density
Lymphopenia physiopathology
Minerals metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 0884-0431
- Volume :
- 10
- Issue :
- 10
- Database :
- MEDLINE
- Journal :
- Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research
- Publication Type :
- Academic Journal
- Accession number :
- 8686513
- Full Text :
- https://doi.org/10.1002/jbmr.5650101018