Alteration in surface ion composition of cultured bone during metabolic, but not respiratory, acidosis.

Alteration in surface ion composition of cultured bone during metabolic, but not respiratory, acidosis.
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代谢期间培养骨的表面离子组成发生变化,但呼吸、酸中毒期间不发生变化。

DOI:
10.1152/ajprenal.1991.261.1.f76
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发表时间:
1991
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Bushinsky,DA
Bushinsky,DA
中科院分区:
--
文献类型:
--
作者:
Chabala,JM;Levi-Setti,R;Bushinsky,DA

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由[HCO 3-]下降产生的酸中毒(代谢性酸中毒,Met)比由PCO 2升高产生的酸中毒(呼吸性酸中毒,Resp)从培养骨中产生更大的Ca流出。为了比较Met和Resp对骨表面离子组成的影响,我们用扫描离子微探针利用二次离子质谱法测量了培养骨中40 Ca,23 Na和39 K的表面丰度。新生小鼠颅骨在模拟Met或Met的培养基中孵育24小时。(pH = 7.193 +/- 0.034,[HCO 3-] = 15.1 +/- 1.4 meq/l),呼吸(pH = 7.153 +/- 0.014,PCO 2 = 85.4 +/- 1.2 mmHg)或正常生理条件(Ctl; pH = 7.484 +/- 0.009,[HCO 3-] = 29.7 +/- 0.7,PCO 2 = 39.6 +/- 0.3)。在2nm深度处的Ctl表面相对于Ca富含Na和K(Na/Ca = 25.6,K/Ca = 12.0,二次离子的计数/秒的比率)。与对照组相比,Met使Na/Ca(6.5,P <0.01)和K/Ca(4.6,P <0.01)急剧下降,而Resp对Na/Ca(23.8)和K/Ca(15.0)无影响。Met(873 +/- 54 nmol.骨-1.24 h-1)中的Ca流出量大于Resp(546 +/- 71 nmol.骨-1.24 h-1,P <0.01),后者大于Ctl(315 +/- 49 nmol.骨-1.24 h-1,P <0.01,与Met和Resp相比)。(250字处删节)
Acidosis produced by a fall in [HCO3-] (metabolic acidosis, Met) produces greater Ca efflux from cultured bone than that produced by a rise in PCO2 (respiratory acidosis, Resp). To compare the effects of Met and Resp on bone surface ion composition we measured the surface abundance of 40Ca, 23Na, and 39K in cultured bone with a scanning ion microprobe utilizing secondary-ion mass spectrometry. Neonatal mouse calvariae were incubated for 24 h in medium simulating either Met (pH = 7.193 +/- 0.034, [HCO3-] = 15.1 +/- 1.4 meq/l), Resp (pH = 7.153 +/- 0.014, PCO2 = 85.4 +/- 1.2 mmHg) or normal physiological (Ctl; pH = 7.484 +/- 0.009, [HCO3-] = 29.7 +/- 0.7, PCO2 = 39.6 +/- 0.3) conditions. The surface of Ctl at 2-nm depth is rich in Na and K relative to Ca (Na/Ca = 25.6, K/Ca = 12.0, ratios of counts/s of secondary ions). Compared with Ctl, Met produced a sharp fall in both Na/Ca (6.5, P less than 0.01) and K/Ca (4.6, P less than 0.01), whereas Resp did not alter Na/Ca (23.8) or K/Ca (15.0). Ca efflux was greater in Met (873 +/- 54 nmol.bone-1.24 h-1) than in Resp (546 +/- 71 nmol.bone-1.24 h-1, P less than 0.01), which was greater than that in Ctl (315 +/- 49 nmol.bone-1.24 h-1, P less than 0.01 vs. Met and vs. Resp).(ABSTRACT TRUNCATED AT 250 WORDS)
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