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Premium Parathyroid hormone sensitizes long bones to the stimulation of bone resorption by 1,25‐dihydroxyvitamin D 3
van Leeuwen J. P. T. M.,
Birkenhäger J. C.,
Bos M. P.,
van der Bemd G. J. C. M.,
HerrmannErlee M. P. M.,
Pols H. A. P.
Publication year1992
Publication title
journal of bone and mineral research
Resource typeJournals
PublisherJohn Wiley and Sons and The American Society for Bone and Mineral Research (ASBMR)
Abstract In response to hypocalcemia the serum PTH level increases rapidly followed by a PTH‐induced rise in 1,25‐dihydroxyvitamin D 3 [1,25‐(OH) 2 D 3 ] production. Therefore, bone is first exposed to increased PTH levels before increased 1,25‐(OH) 2 D 3 levels. In the present study the effect of pretreatment with PTH on 1,25‐(OH) 2 D 3 ‐induced bone resorption was examined. Bone resorption was measured as release of prelabeled 45 Ca during culture from 17‐day‐old fetal mice radii/ulnae and metatarsals. Radii/ulnae and metatarsals are characterized by differences in development. In radii/ulnae mature osteoclasts are present, whereas in metatarsals only different stages of preosteoclasts can be found. Preincubation for 24 h but not 4 h with PTH increases the stimulation of bone resorption by 1,25‐(OH) 2 D 3 in fetal radii/ulnae but not in metatarsals. Coincubation of PTH and 1,25‐(OH) 2 D 3 did not result in a significant change in bone resorption compared to 1,25‐(OH) 2 D 3 alone. The observed difference in the effect of pretreatment with PTH between radii/ulnae and metatarsals indicates that PTH does not stimulate the development of early osteoclast precursors but that a certain level of differentiation of the osteoclast precursor is required. Pretreatment with prostaglandin E 2 resulted in an effect similar to that of PTH. Inhibition of prostaglandin synthesis by indomethacin prevented the potentiation of 1,25‐(OH) 2 D 3 ‐induced bone resorption by pretreatment with PTH. Thus, the present study demonstrates that PTH sensitizes responses to 1,25‐(OH) 2 D 3 . PTH must be present before 1,25‐(OH) 2 D 3 to observe a potentiation of 1,25‐(OH) 2 D 3 ‐induced bone resorption. Local production of prostaglandins seems to be involved in this action of PTH. Taken together, these data suggest that besides increased renal production of 1,25‐(OH) 2 D 3 PTH also sensitizes bone for the 1,25‐(OH) 2 D 3 ‐induced bone resorption.
Subject(s)bone resorption , calcitriol , calcium , chemistry , endocrinology , medicine , osteoclast , parathyroid hormone , prostaglandin e , prostaglandin e2 , receptor , resorption , stimulation , vitamin d and neurology
SCImago Journal Rank1.882

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