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DIABETOLOGIA:通过胰岛素和胰岛素类似物X10激活COLO-205结肠癌异种移植物中的胰岛素受体和IGF-1受体不会在正常或低血糖条件下促进生长

2018-12-23 MedSci MedSci原创

最近对正常大鼠和小鼠同种异体移植模型的研究表明,胰岛素和胰岛素类似物在体内不会激活IGF-1受体,因此,用Sprague Dawley大鼠进行毒性研究这一特征不能导致慢性胰岛素类似物X10的乳腺肿瘤发生率增加。这与体外胰岛素和胰岛素类似物的报道形成鲜明对比。因此阐明这对于理解胰岛素类似物可能促进生长促进作用的机制是重要的,并且将对新型胰岛素类似物的开发具有重要意义。 研究人员在人类结肠癌细胞

最近对正常大鼠和小鼠同种异体移植模型的研究表明,胰岛素和胰岛素类似物在体内不会激活IGF-1受体,因此,用Sprague Dawley大鼠进行毒性研究这一特征不能导致慢性胰岛素类似物X10的乳腺肿瘤发生率增加。这与体外胰岛素和胰岛素类似物的报道形成鲜明对比。因此阐明这对于理解胰岛素类似物可能促进生长促进作用的机制是重要的,并且将对新型胰岛素类似物的开发具有重要意义。

研究人员在人类结肠癌细胞系COLO-205中建立了BALB / c裸鼠的异种移植模型,该细胞系表达人胰岛素和IGF-1受体,并探讨了超药理剂量的人胰岛素、胰岛素类似物X10和人IGF-1。使用新型抗体治疗的急性和慢性效应。利用一种新型抗体,还检测了人胰岛素、胰岛素类似物X10或人IGF-1处理的正常大鼠各组织中急性IGF-1受体的激活情况。最后,在具有四氧嘧啶诱导的高血糖的BALB / c裸鼠中研究了药理学相关剂量的人胰岛素和胰岛素类似物X10对受体激活和COLO-205异种移植物生长的影响。

结果显示,在携带COLO-205细胞异种移植物的正常大鼠和BALB / c裸鼠中,用超药物剂量的人胰岛素,胰岛素类似物X10或人IGF-1处理会导致胰岛素受体以及IGF-1受体的活化。用药理学相关剂量的人胰岛素或胰岛素类似物X10治疗糖尿病裸鼠,将血糖从高血糖水平降低至正常血糖范围,但不增加IGF-1受体活化。此外,用超药理学和药理学剂量的人胰岛素或胰岛素类似物X10重复治疗不影响COLO-205异种移植物的生长。

该研究表明,胰岛素和胰岛素类似物对癌细胞中IGF-1受体的激活不能被认为是纯粹的体外现象。它确实在动物模型中体内发生,尽管仅发生在用超药物剂量治疗后。此外,用胰岛素或胰岛素类似物X10治疗不影响COLO-205异种移植物在正常或低血糖条件下的生长。在明确胰岛素类似物对IGF-1受体激活是否与体内生长增加相关的结论之前,还需要进一步的研究。

 原始出处:

Henning Hvid, Mikkel S. Jørgensen, Niels Blume, Rita Slaaby,Activation of insulin receptors and IGF-1 receptors in COLO-205 colon cancer xenografts by insulin and insulin analogue X10 does not enhance growth under normo- or hypoglycaemic conditions

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    2019-01-19 qingrejiedu
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    2019-11-08 baoya
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    2019-05-15 xxxx1049
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    2019-01-18 xuyong535
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    2018-12-23 天地飞扬

    了解一下,谢谢分享!

    0

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