Postnatal changes in serum osteocalcin and parathyroid hormone concentrations.

Postnatal changes in serum osteocalcin and parathyroid hormone concentrations.
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产后血清骨钙素和甲状旁腺激素浓度的变化。

DOI:
10.1080/07315724.1990.10720393
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发表时间:
1990
影响因子:
3.5
通讯作者:
Tsang,RC
Tsang,RC
中科院分区:
医学4区
文献类型:
--
作者:
Loughead,JL;Mimouni,F;Ross,R;Tsang,RC

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出生时夹紧脐带会导致胎儿钙 (Ca) 供应中断。出生后,新生儿甲状旁腺激素(PTH)的分泌似乎受到低钙血症的刺激,血清PTH在出生后增加,并在24小时内达到峰值。 PTH 的升高可能会导致骨吸收和钙释放。我们推测骨形成也可能受到影响,并且骨形成的血清标志物、血清骨钙素(OC)浓度将在出生后降低。 OC 由成骨细胞合成,其血清浓度被认为反映了骨形成。我们测量了 26 名无并发症妊娠、临产和分娩后出生的新生儿的脐带血以及 2 小时和 24 小时的血清离子钙 (iCa)、PTH 和 OC。血清 iCa (mg/dl) 从 5.79 +/- 0.06(绳索,平均值 +/- SEM)下降至 5.31 +/- 0.05(2 小时),然后降至 4.89 +/- 0.05(24 小时)(p 小于 0.05)。血清 PTH(微升 Eq/ml)从 35.9 +/- 4.3(脐带)增加至 41.7 +/- 4.0(2 小时)(p = 0.1),并增加至 50.3 +/- 4.6(24 小时)(p 小于 0.01)。血清 OC (ng/ml) 从 55.1 +/- 10.6(脐带)下降至 12.4 +/- 4.3(2 小时)(p 小于 0.01),然后稳定在 12.7 +/- 1.9(24 小时)。 OC 的变化(脐带减去 24 小时)与出生后 24 小时内 PTH 的变化呈反比(r = -0.42。p = 0.03)。因此,在生命的最初 24 小时内,骨形成指数(即血清 OC)会突然下降,其中血清 PTH 上升可能会产生影响。(摘要截断为 250 字)
Cord clamping at birth leads to interruption of calcium (Ca) supply to the fetus. After birth, neonatal parathyroid hormone (PTH) secretion appears stimulated by hypocalcemia, with serum PTH increasing after birth and peaking at 24 hours of age. This rise in PTH presumably leads to bone resorption and Ca release. We theorize that bone formation may also be affected and that a serum marker of bone formation, serum osteocalcin (OC) concentrations, will decrease postnatally. OC is synthesized by osteoblasts and its serum concentrations are believed to reflect bone formation. We measured serum ionized Ca (iCa), PTH, and OC in cord blood and at 2 and 24 hours in 26 neonates born after uncomplicated pregnancies, labors, and deliveries. Serum iCa (mg/dl) decreased from 5.79 +/− 0.06 (cord, means +/− SEM) to 5.31 +/− 0.05 (2 hr), then to 4.89 +/− 0.05 (24 hr) (p less than 0.05). Serum PTH (microliter Eq/ml) increased from 35.9 +/− 4.3 (cord) to 41.7 +/− 4.0 (2 hr) (p = 0.1), and to 50.3 +/− 4.6 (24 hr) (p less than 0.01). Serum OC (ng/ml) decreased from 55.1 +/− 10.6 (cord), to 12.4 +/− 4.3 (2 hr) (p less than 0.01), then remained stable at 12.7 +/− 1.9 (24 hr). The change (cord minus 24 hr) in OC correlated inversely with the change in PTH over the first 24 hours of age (r = -0.42. p = 0.03). Therefore, there is a sudden decrease in an index of bone formation (i.e., serum OC) in the first 24 hours of life in which rising serum PTH may have had an impact.(ABSTRACT TRUNCATED AT 250 WORDS)
围产期维生素 D 稳态:母体、脐带和新生儿血液中的 1,25-二羟基维生素 D。
DOI: --
发表时间: 1980
影响因子: 158.5
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DOI: --
发表时间: 1985
影响因子: 15.9
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DOI: 10.1016/0221-8747(84)90064-x
发表时间: 1984-01-01
期刊: METABOLIC BONE DISEASE & RELATED RESEARCH
影响因子: --
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发表时间: 1981-12
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血清中人甲状旁腺激素的放射免疫测定。
DOI: 10.1172/jci106476
发表时间: 1971
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影响因子: --
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