Thrombin and parathyroid hormone mobilize intracellular calcium in rat osteosarcoma cells by distinct pathways

Michael Babich, Hester Choi, Randolph M. Johnson, Kathleen L. King, Gay E. Alford, Robert A. Nissenson

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Abstract

The mechanisms by which PTH and thrombin mobilize intracellular Ca2+ (Cai 2+) were examined in UMR 106-H5 rat osteosarcoma cells. Bovine PTH-(1-34) (24 pM to 240 nM) produced a dose-dependent increase in Cai 2+ (EC50, 3 nM), which returned to baseline within 75 sec. Human α-thrombin produced an increase in Cai 2+ (ECmax, 10 U/ml) which was similar to that of PTH with respect to both magnitude and time course. Chelation of extracellular calcium with 5.0 mM EGTA did not alter the Cai 2+ response to either PTH or thrombin. When added together at maximally effective concentrations, PTH and thrombin produced additive effects on Cai 2+ in the presence and absence of EGTA. The additive effects of PTH and thrombin on Cai 2+. were confirmed at the single cell level, using laser-based image analysis. Bradykinin (1 μM) produced a significant increase in Cai 2+ in UMR 106-H5 cells which was of lesser magnitude than the peak 2- to 3-fold increase elicited by PTH or thrombin. Preexposure of cells to 10 U/ml thrombin for 2 min abolished the Cai 2+ response to bredykinin, whereas preexposure to 240 nM PTH had no effect on the Cai 2+ response to bradykinin. Thrombin elicited a rapid increase in the accumulation of 3H-labeled inositol phosphates (IP2 and IP3) in UMR 106-H5 cells, with increases in [3H]1,4,5-IP3 detectable as early as 15 sec after the addition of thrombin. Bradykinin increased [3H]IP production to a lesser extent than thrombin, whereas PTH neither increased [3H]IP accumulation nor potentiated the [3H]IP response to thrombin. The results suggest that thrombin and bradykinin mobilize Cai 2+ from a shared IP3-responsive calcium pool, whereas PTH may use signals in addition to 1,4,5-IP3 to mobilize calcium from a distinct cellular calcium pool. Alternatively, specific calcium compartmentalization exists, and there is differential coupling of these agonists to the 1,4,5-IPa/Cai 2+. pathway.

Original languageEnglish (US)
Pages (from-to)1463-1470
Number of pages8
JournalEndocrinology
Volume129
Issue number3
StatePublished - Sep 1991

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Osteosarcoma
Parathyroid Hormone
Thrombin
Calcium
Bradykinin
Inositol 1,4,5-Trisphosphate
Egtazic Acid
Inositol Phosphates
Lasers

ASJC Scopus subject areas

  • Endocrinology
  • Endocrinology, Diabetes and Metabolism

Cite this

Babich, M., Choi, H., Johnson, R. M., King, K. L., Alford, G. E., & Nissenson, R. A. (1991). Thrombin and parathyroid hormone mobilize intracellular calcium in rat osteosarcoma cells by distinct pathways. Endocrinology, 129(3), 1463-1470.

Thrombin and parathyroid hormone mobilize intracellular calcium in rat osteosarcoma cells by distinct pathways. / Babich, Michael; Choi, Hester; Johnson, Randolph M.; King, Kathleen L.; Alford, Gay E.; Nissenson, Robert A.

In: Endocrinology, Vol. 129, No. 3, 09.1991, p. 1463-1470.

Research output: Contribution to journalArticle

Babich, M, Choi, H, Johnson, RM, King, KL, Alford, GE & Nissenson, RA 1991, 'Thrombin and parathyroid hormone mobilize intracellular calcium in rat osteosarcoma cells by distinct pathways', Endocrinology, vol. 129, no. 3, pp. 1463-1470.
Babich M, Choi H, Johnson RM, King KL, Alford GE, Nissenson RA. Thrombin and parathyroid hormone mobilize intracellular calcium in rat osteosarcoma cells by distinct pathways. Endocrinology. 1991 Sep;129(3):1463-1470.
Babich, Michael ; Choi, Hester ; Johnson, Randolph M. ; King, Kathleen L. ; Alford, Gay E. ; Nissenson, Robert A. / Thrombin and parathyroid hormone mobilize intracellular calcium in rat osteosarcoma cells by distinct pathways. In: Endocrinology. 1991 ; Vol. 129, No. 3. pp. 1463-1470.
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abstract = "The mechanisms by which PTH and thrombin mobilize intracellular Ca2+ (Cai 2+) were examined in UMR 106-H5 rat osteosarcoma cells. Bovine PTH-(1-34) (24 pM to 240 nM) produced a dose-dependent increase in Cai 2+ (EC50, 3 nM), which returned to baseline within 75 sec. Human α-thrombin produced an increase in Cai 2+ (ECmax, 10 U/ml) which was similar to that of PTH with respect to both magnitude and time course. Chelation of extracellular calcium with 5.0 mM EGTA did not alter the Cai 2+ response to either PTH or thrombin. When added together at maximally effective concentrations, PTH and thrombin produced additive effects on Cai 2+ in the presence and absence of EGTA. The additive effects of PTH and thrombin on Cai 2+. were confirmed at the single cell level, using laser-based image analysis. Bradykinin (1 μM) produced a significant increase in Cai 2+ in UMR 106-H5 cells which was of lesser magnitude than the peak 2- to 3-fold increase elicited by PTH or thrombin. Preexposure of cells to 10 U/ml thrombin for 2 min abolished the Cai 2+ response to bredykinin, whereas preexposure to 240 nM PTH had no effect on the Cai 2+ response to bradykinin. Thrombin elicited a rapid increase in the accumulation of 3H-labeled inositol phosphates (IP2 and IP3) in UMR 106-H5 cells, with increases in [3H]1,4,5-IP3 detectable as early as 15 sec after the addition of thrombin. Bradykinin increased [3H]IP production to a lesser extent than thrombin, whereas PTH neither increased [3H]IP accumulation nor potentiated the [3H]IP response to thrombin. The results suggest that thrombin and bradykinin mobilize Cai 2+ from a shared IP3-responsive calcium pool, whereas PTH may use signals in addition to 1,4,5-IP3 to mobilize calcium from a distinct cellular calcium pool. Alternatively, specific calcium compartmentalization exists, and there is differential coupling of these agonists to the 1,4,5-IPa/Cai 2+. pathway.",
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