CN110227080A - 甘露葡萄糖醛酸多(寡)糖及其衍生物在制备治疗和/或预防2型糖尿病药物中的应用 - Google Patents
甘露葡萄糖醛酸多(寡)糖及其衍生物在制备治疗和/或预防2型糖尿病药物中的应用 Download PDFInfo
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Abstract
本发明提供了甘露葡萄糖醛酸多(寡)糖及其衍生物在制备治疗和/或预防2型糖尿病药物或保健品中的应用,所述甘露葡萄糖醛酸多(寡)糖及其衍生物的结构式如式(I)或(II)所示,其毒副作用小,安全有效;
Description
(一)技术领域
本发明属于生物医药领域,涉及甘露葡萄糖醛酸多(寡)糖及其衍生物在制备治疗和/或预防2型糖尿病药物或保健品中的应用。
(二)背景技术
糖尿病是当今严重影响人类生命健康的疾病之一。世卫组织报告指出,2014年全球成人糖尿病患者约4.22亿,患病率达到8.5%;并且现在患病率呈逐年递增的趋势。尽管目前已经具有多种用于降糖的药物,但糖尿病的控制现状依然十分严峻。63%的2型糖尿病患者仍然得不到有效的治疗,体内糖化血红蛋白水平(HBA1c)大于美国糖尿病协会所提出7%的标准水平。因此,需要进一步揭示糖尿病的发病机制,研发一系列各具特点的降糖药物,满足不同糖尿病患者的需求。因此,阐明糖尿病发病机制,开发新糖尿病治疗药物,为未来糖尿病患者个体化治疗提供更多的选择,具有重要现实的意义。
糖尿病是一种由于胰岛素分泌缺陷或胰岛素作用障碍所致的以高血糖为特征的代谢性疾病。持续高血糖与长期代谢紊乱等可导致全身组织器官(例如:肝、眼、肾、心血管及神经系统)的损害及其功能障碍和衰竭。在发病早期,胰岛素抵抗较轻,胰岛β细胞可通过提高单细胞工作负荷和/或代偿性增生增加细胞的数量增加胰岛素分泌,以满足机体相对较高的胰岛素需求,维持血糖浓度的相对稳定。随着2型糖尿病的进展,胰岛素抵抗愈发严重,机体慢性炎症也不断加重,血脂血糖水平不断升高,对胰岛β细胞产生不可逆转的损伤,最终发展成为2型糖尿病。
近年来,糖类药物从其药效和安全性方面考虑,其发展趋势逐渐从对多糖的研究转到对低聚糖和寡糖的研究。寡糖在医疗保健领域具有巨大的需求空间。寡糖类药物结构均一,质量可控,作用机制明确,已经成为糖类药物的主攻方向之一。
甘露葡萄糖醛酸多(寡)糖及其衍生物是一类酸性多(寡)糖,研究发现甘露葡萄糖醛酸多(寡)糖及其衍生物对2型糖尿病具有显著疗效,可以应用于2型糖尿病的预防和治疗。
(三)发明内容
本发明的目的是提供甘露葡萄糖醛酸多(寡)糖及其衍生物在制备治疗和/或预防2型糖尿病药物或保健品中的应用。
本发明的技术方案如下:
甘露葡萄糖醛酸多(寡)糖及其衍生物在制备治疗和/或预防2型糖尿病药物或保健品中的应用,所述甘露葡萄糖醛酸多(寡)糖具有如下特征:
(1)组成糖:甘露糖和葡糖糖醛酸或其盐;
(2)2-连接的甘露糖和4-连接的葡萄糖醛酸或其盐交替连接;
所述甘露葡萄糖醛酸多(寡)糖及其衍生物的结构式如式(I)或(II)所示:
式(I)中,R为H、Na、K或NH4 +,n为0~40之间的整数;
式(II)中,R为H、Na、K或NH4 +,n为0~40之间的整数。
进一步,所述药物为含有甘露葡萄糖醛酸多(寡)糖及其衍生物和药学可接受的载体和/或赋形剂的药物组合物;
所述载体例如:海藻酸钠微球、脂质体等;
所述赋形剂例如:甘露醇、硬脂酸镁、淀粉、环糊精等;
所述药物的剂型为注射剂、口服制剂或局部给药制剂。
本发明具有如下优点:
甘露葡萄糖醛酸多(寡)糖及其衍生物对2型糖尿病具有预防和治疗作用,毒副作用小,安全有效,可以用于制备治疗和预防2型糖尿病的药物和保健品。
(四)附图说明
图1寡糖的制备过程中酒精洗脱液的凝胶色谱图。
图2甘露葡萄糖醛酸寡糖G1-G4的ESI-MS和HPLC图;a为GM2;b为GM4;c为GM6;d为GM8。
图3 GMn的氢谱。
图4 GMn的碳谱。
图5 GMn的二维HMBC谱图。
图6 GMn的二维HSQC谱图。
图7 GMn的二维HHCOSY谱图。
图8 GMn的GPC-HPLC谱图。
图9甘露葡萄糖醛酸多(寡)糖促进葡萄糖消耗。
图10甘露葡萄糖醛酸多(寡)糖促进胰岛素分泌。
(五)具体实施方式
下面通过具体实施例对本发明作进一步的描述,但本发明的保护范围并不仅限于此。
实施例1甘露葡萄糖醛酸寡糖的制备
将干海带采用30倍质量的蒸馏水100℃下提取3小时,提取液经过过滤,浓缩后,加乙醇至终浓度为75%沉淀,静置12小时后收集沉淀,沉淀经真空干燥得到海带多糖。将海带多糖样品溶于质量浓度为4%的硫酸溶液中(料液比为60mg/mL)加热回流5小时,用氢氧化钡中和至pH=6-7,离心,上清液浓缩至原始体积的五分之一,浓缩液上活性炭柱层析,首先用蒸馏水平衡,然后用体积分数50%乙醇(500mL)和90%乙醇(500mL)的水溶液梯度洗脱,合并洗脱液,浓缩至原始体积的五分之一,蒸去乙醇,直接上Bio-gel P4柱层析,分离得到五个组分(图1所示),对上面收集得到的样品进行ESI-MS和HPLC分析(图2所示)。结果进一步确认寡糖的结构。结果显示,G1-G4分别为甘露葡萄糖醛酸八糖(GM8),六糖(GM6),四糖(GM4)和二糖(GM2)。其结构均符合下图所示的结构式:
其中G1为甘露葡萄糖醛酸八糖(GM8),式中n1=3,R1为H或者NH4 +;
G2为甘露葡萄糖醛酸六糖(GM6),式中n1=2,R1为H或者NH4 +;
G3为甘露葡萄糖醛酸四糖(GM4),式中n1=1,R1为H或者NH4 +;
G4为甘露葡萄糖醛酸二糖(GM2),式中n1=0,R1为H或者NH4 +。
实施例2甘露葡萄糖醛酸多糖的制备
将实施例1中的得到海带多糖溶于质量浓度为4%的硫酸溶液中(料液比为60mg/mL)加热回流4小时,用氢氧化钡中和至pH=6-7,离心,上清液浓缩至原始体积的五分之一,浓缩液上DEAESepharose Fast Flow分离,分别采用水洗(5L),0.2M氯化钠(5L)和2M氯化钠(5L)洗脱,2M洗脱液通过500Da透析袋透析制备得到甘露葡萄糖醛酸多糖GMn(7.0kDa),对样品进行1H-NMR,13C-NMR,二维NMR和GPC-HPLC等(图3-图8所示)。结果进一步确认甘露葡萄糖醛酸多糖的结构。其结构均符合下图所示的结构式:
其中GMn为甘露葡萄糖醛酸多糖,式中n1≈20,R1为H,K或者Na。
实施例3:甘露葡萄糖醛酸多(寡)糖能促进HepG2细胞的葡萄糖消耗
HepG2是人源肝癌细胞系,生长迅速,性状稳定,是研究肝脏保护作用的常用细胞系。促进外周组织的葡萄糖代谢,提高肝细胞对胰岛素的敏感性。用二甲双胍和实施例1和2的甘露葡萄糖醛酸多(寡)糖进行药物处理24h,采用葡萄糖氧化酶法测定培养液中葡萄糖的变化。在葡萄糖消耗实验24h孵育结束后,每孔加入MTT,进行细胞活力的测定。结果显示甘露葡萄糖醛酸多(寡)糖组的葡萄糖消耗呈聚合度和剂量增加(图9)。此外,甘露葡萄糖醛酸多(寡)糖组对HepG2细胞没有抑制,二甲双胍组抑制率达到4.76%±3.46。
实施例4:甘露葡萄糖醛酸多(寡)糖能增强胰岛β细胞的胰岛素分泌
实验采用正常小鼠的胰岛,用棕榈酸处理得到胰岛细胞损伤模型。用GSIS进行胰岛素分泌功能的测定。实施例1和2中的甘露葡萄糖醛酸多(寡)糖能明显增强胰岛的胰岛素分泌功能(图10)。同时,甘露葡萄糖醛酸多(寡)糖对胰岛没有抑制作用,胰岛的形态,结构完整。
以上描述了本发明的具体实施例,然并非用以限定本发明,本领域技术人员对在此公开的实施方案可进行并不偏离本发明范畴和精神的改进和变化。
Claims (5)
1.甘露葡萄糖醛酸多(寡)糖及其衍生物在制备治疗和/或预防2型糖尿病药物或保健品中的应用,所述甘露葡萄糖醛酸多(寡)糖及其衍生物的结构式如式(I)或(II)所示:
式(I)中,R为H、Na、K或NH4 +,n为0~40之间的整数;
式(II)中,R为H、Na、K或NH4 +,n为0~40之间的整数。
2.如权利要求1所述的应用,其特征在于,所述药物为含有甘露葡萄糖醛酸多(寡)糖及其衍生物和药学可接受的载体和/或赋形剂的药物组合物。
3.如权利要求2所述的应用,其特征在于,所述载体为:海藻酸钠微球或脂质体。
4.如权利要求2所述的应用,其特征在于,所述赋形剂为:甘露醇、硬脂酸镁、淀粉或环糊精。
5.如权利要求2所述的应用,其特征在于,所述药物的剂型为注射剂、口服制剂或局部给药制剂。
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