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- W2034165346 abstract "There are several reports indicating that parathyroid hormone (PTH), besides inducing the formation of cyclic adenosine monophosphate (cAMP), also causes an increase in cytoplasmic free Ca2+ ([Ca2+]i) in osteoblasts, and it has been speculated that both of these second messengers are necessary to mediate PTH-induced bone resorption. In the osteoblastic cell line MC3T3-E1, bovine PTH 1-34 (10 nmol/l-1 mumol/l) stimulated cAMP formation but did not cause an increase in [Ca2+]i in adherent single cells (basal [Ca2+]i = 151 +/- 5 nmol/l, mean +/- SEM; N = 98). In contrast, subsequent addition of bradykinin (1 mumol/l) resulted in a transient increase in [Ca2+]i from a basal level of 155 +/- 11 nmol/l to a peak value of 351 +/- 60 nmol/l (N = 14). When the PTH challenge was followed by the addition of thrombin (10 U/ml), the latter induced a transient rise in [Ca2+]i from a basal level of 173 +/- 12 nmol/l to a peak at 341 +/- 33 nmol/l (N = 20). Primary cultures of human osteoblasts were obtained from trabecular bone. These cells were also PTH-responsive in terms of cAMP formation. On the other hand, human PTH 1-34 (100 nmol/l) did not affect [Ca2+]i in the isolated human osteoblasts, while bradykinin (1 mumol/l) caused a transient increase in [Ca2+]i (from a basal value of [Ca2+]i at 154 +/- 10 nmol/l to a peak value of 757 +/- 147 nmol/l within 30 s; N = 16).(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2034165346 date "1993-08-01" @default.
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- W2034165346 title "Parathyroid hormone is able to enhance cyclic adenosine monophosphate formation without causing an increase in cytoplasmic Ca2+ in osteoblasts" @default.
- W2034165346 doi "https://doi.org/10.1530/acta.0.1290178" @default.
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