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邻苯二甲酸酯、双酚A在血液中的环境类激素效应研究
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摘要
环境类激素是一类外源性干扰生物和人体正常内分泌机能的化学物质,也被称为内分泌干扰物质。它对生物体内分泌系统的复合干扰损害作用,主要包括对生物的生殖与发育系统的干扰或致畸影响,内分泌系统紊乱或免疫功能改变,致突变或致癌性影响,神经系统失调等现象。性激素作为类固醇激素,在体内的作用途径可分为血液—细胞质—细胞核三个环节,任何一个环节中类固醇激素的作用受到干扰,都将影响到类固醇激素在体内的正常调节作用。
     目前,环境当中存在的能够证明或间接证明属于环境激素类的物质有70种。本文选取了两种已被确认的环境激素—邻苯二甲酸二丁酯(DBP)和双酚A(BPA)为研究对象,采用荧光光谱分析法,测定了DBP和BPA在水溶液中与雌激素(E_2)/雄激素(睾酮)和血清蛋白组分间的二元、三元体系结合常数,分析了二者在血液中引起的雌、雄激素平衡比例的变化。
     荧光分析结果表明:DBP(BPA)血清蛋白组分和E_2(睾酮)之间能两两结合。当E_2、DBP和血清蛋白组分处于同一体系中,随着DBP浓度的增加,E_2与血清蛋白组分—DBP二元体系间的结合常数也逐渐增大,其最大值约为正常E_2与血清蛋白组分结合常数的3倍;在睾酮、DBP和血清蛋白组分的体系中,随着DBP浓度的增加,睾酮与血清蛋白组分—DBP二元体系的结合常数也呈现上升趋势,其最大值约为正常睾酮与血清蛋白组分结合常数的4倍。这表明DBP的存在可能不会与E_2和睾酮对血清蛋白组分进行竞争结合,但由于本身的结合特点,会减少血液中游离E_2和睾酮的含量,进而减少进入细胞内E_2和睾酮的量,同时DBP还会引起血液中雌、雄激素平衡比例的失调。雌、雄个体分组实验结果表明:DBP使雌性个体血液中游离E_2和睾酮的平衡比例降低,而对雄性个体作用不显著。
     实验结果还表明:当E_2、BPA和血清蛋白组分处于同一体系中,随着BPA浓度的增加,E_2与血清蛋白组分—BPA二元体系间的结合常数也逐渐增加,其最大值高出正常E_2与血清蛋白组分结合常数约一个数量级;在睾酮、BPA和血清蛋白组分的体系中,随着BPA浓度的增加,睾酮与血清蛋白组分—BPA二元体系的结合常数明显上升,其最大值高出正常睾酮与血清蛋白组分结合常数近一个数量级。雌、雄个体分组实验结果表明:BPA使雄性个体血液中游离E_2和睾酮的平衡比例升高,而对雌性个体作用不显著。
     本文研究结果表明:BPA在血液中的环境类激素效应明显强于DBP,而且二者在血液中对E_2和睾酮有着相似的干扰作用,它们会使血液中E_2和睾酮的结合量增大,从而限制血液内游离E_2和睾酮的浓度,减少进入细胞内E_2和睾酮的量,进而使细胞内E_2和睾酮的平衡受到影响。
In this dissertation, the combination of estradiol (E2), testosterone (T), dibutyl phathalate (DBP), bisphenol-A (BPA) and serum components had been determined in the binary and ternary systems by fluorescence method.
    The results of fluorimetry showed that DBF (BPA), serum components and estradiol (testosterone) can combinate one another. In the E2-DBP-semm components ternary system, the combination constants of estradiol and binary system (DBP-serum components) would increase gradually with increasing the concentration of DBP, the maximum of combination constant is about three times of ordinary combination constant of binary system (E2-serum components). In the system of testosterone, DBP and serum components, with the increase of DBP concentration, the combination constants of testosterone and DBP-serum components showed a increase trend, the maximum can be four times of the combination constant of T-semm components. The result indicates that DBP may not compete with estradiol and testosterone for binding to serum components. On the contrary, because of the binding characteristic of DBP, it can decrease the free content of estradiol and testosterone in blood, and influence the balance of sex hormone in blood. The experiment showed that DBP make the balance proportion lower in female blood. But it has little effect on male.
    In the E2-BPA-serum components ternary system, the maximum of combination constant is about ten times higher than ordinary combination constant of binary system (Ej-serum components). In the system of testosterone, BPA and serum components, with the increase of BPA concentration, the combination constants of testosterone and BPA-serum components would increase apparently, and the maximum can also be ten times higher than the combination constant of T-serum components. The result also indicates that BPA make the balance proportion higher in male blood. But it has little effect on female.
    The paper showed that the hormone mimic effect of BPA is stronger than the effect of DBF. Moreover, both of them have same disturb function on estradiol and testosterone in blood. They can make the binding content of estradiol and testosterone increase in blood. Then they restricted the free concentration of estradiol and testosterone in blood and reduce the content of estradiol and testosterone which entered the cell. Finally, the balance of estradiol and testosterone is affected in cell.
引文
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