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. 1989 May;86(9):3361–3365. doi: 10.1073/pnas.86.9.3361

Direct and sex-specific stimulation by sex steroids of creatine kinase activity and DNA synthesis in rat bone.

D Sömjen 1, Y Weisman 1, A Harell 1, E Berger 1, A M Kaye 1
PMCID: PMC287132  PMID: 2717619

Abstract

A direct in vitro effect of 17 beta-estradiol (E2) was demonstrated on bone and cartilage cell energy metabolism. Sex-specific stimulation by E2 and testosterone was shown in diaphyseal bone of weanling rats. E2 (30 nM) caused, within 24 hr, a 70-200% increase in creatine kinase (CK; ATP:creatine N-phosphotransferase, EC 2.7.3.2) specific activity in ROS 17/2.8 rat osteogenic sarcoma cells, MC3T3-E1 mouse calvaria-derived cells, and rat fetal calvaria cells, and a 40% increase in rat epiphyseal cartilage cells. Stimulation of CK activity by E2 was dose and time dependent: in ROS 17/2.8 cells, a highly significant increase was found at 3 nM E2 and a greater than 100% increase in CK activity was found 1 hr after E2 administration. In female 20-day-old Wistar-derived rats, E2 (5 micrograms per rat) increased CK activity in diaphyseal bone by 82% within 1 hr of i.p. injection, with a maximal increase of 200% after 24 hr; neither the weakly estrogenic agonist 17 alpha-estradiol, testosterone, nor progesterone showed this effect. Conversely, in male rat diaphyseal bone, testosterone or dihydrotestosterone increased CK activity after 24 hr by approximately 100%, while E2 was ineffective. In epiphyseal cartilage, both E2 and testosterone increased CK activity. Stimulation of CK activity by sex hormones was paralleled by significant increases in [3H]thymidine incorporation into DNA. Therefore, it is possible that direct sex-specific actions of gonadal steroids may contribute to stimulating bone growth and maintaining balanced bone turnover.

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Selected References

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