Amylin inhibits ovariectomy-induced bone loss in rats

Amylin (AMY), a peptide co-secreted with insulin by pancreatic beta-cells, inhibits bone resorption and stimulates osteoblastic activity. The ovariect omized (OVX) rat is an established animal model for human osteoporosis. Thu s, the present experiment was performed to study the effects of AMY on estr ogen deficiency-induced bone loss in rats. Thirty-one 6-month-old Wistar ra ts were randomized by body weight (BW) into two groups. The first underwent surgical OVX (n = 21). The second was sham-operated (SH; n = 10). Sixty da ys after surgery, 11 OVX rats were s.c. injected with rat AMY (3 mu g/100 g BW/day, for 30 days; OVX+AMY), and 10 with solvent alone in the: same way (0.15 ml/100 g BW; OVX). Each rat, housed in an individual cage, was fed da ily the mean quantity of diet consumed the day before by SH rats. This diet contained 0.24% calcium and 0.16% phosphorus. The 31 animals were killed o n day 90. No difference in daily weight gain and BW was observed between gr oups. Neither AMY treatment nor OVX had any significant effect upon femoral morphology, femoral failure load, diaphyseal femoral density (representati ve of cortical bone) and total femoral calcium content. Nevertheless, both distal meta physeal (representative of cancellous bone) and total femoral b one densities were higher in SH and OVX+AMY than in OVX rats. The highest p lasma osteocalcin concentration was measured in OVX+AMY rats. Simultaneousl y, urinary deoxypyridinoline excretion was lower in OVX+AMY than in OVX rat s. These results indicate that in OVX rats, AMY treatment inhibited trabecu lar bone loss both by inhibiting resorption and by stimulating osteoblastic activity.