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首页> 外文期刊>Cell biology international. >DEMONSTRATION OF ENDOTHELIN (ET) RECEPTORS ON CULTURED RABBIT CHONDROCYTES AND STIMULATION OF DNA SYNTHESIS AND CALCIUM INFLUX BY ET-1 VIA ITS RECEPTORS
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DEMONSTRATION OF ENDOTHELIN (ET) RECEPTORS ON CULTURED RABBIT CHONDROCYTES AND STIMULATION OF DNA SYNTHESIS AND CALCIUM INFLUX BY ET-1 VIA ITS RECEPTORS

机译:内皮素(ET)受体在培养的兔软骨细胞上的演示以及通过其受体刺激ET-1促进DNA合成和钙离子流入

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摘要

Endothelin (ET) receptors on chondrocytes were demonstrated using cultured rabbit costal chondrocytes. After crosslinking the receptors on the cells with I-125-ET-1, two major bands of 43 kDa and 46 kDa were separated by SDS-PAGE. Scatchard analysis demonstrated two classes of ET receptors with K-d values of 1 x 10(-10) M and 5 x 10(-9) M. The numbers of high- and low- affinity receptors were 1 x 10(4) and 2 x 10(5) per cell, respectively. The binding of ET-1 to chondrocytes was increased by treatment with PTH, DBcAMP, TGF-beta 1, IL-1 beta RA and EGF. ET-1 stimulated DNA synthesis in cultured rabbit chondrocytes. ET-1 also stimulated calcium incorporation through the cell membrane of chondrocytes. These findings indicate that ET-1 has a physiological effect on chondrocytes via its receptors on the cells.
机译:使用培养的兔肋软骨细胞证明了软骨细胞上的内皮素(ET)受体。用I-125-ET-1交联细胞上的受体后,通过SDS-PAGE分离了43 kDa和46 kDa的两个主要条带。 Scatchard分析表明,两类ET受体的Kd值分别为1 x 10(-10)M和5 x 10(-9)M。高和低亲和力受体的数量分别为1 x 10(4)和2 x每个单元格分别为10(5)。通过用PTH,DBcAMP,TGF-beta 1,IL-1 beta RA和EGF处理,ET-1与软骨细胞的结合增加。 ET-1刺激了培养的兔软骨细胞中的DNA合成。 ET-1还刺激钙通过软骨细胞的细胞膜掺入。这些发现表明ET-1通过其在细胞上的受体对软骨细胞具有生理作用。

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