再生医学的新方向:多肽

2022-04-17 Allan MedSci原创

一种称为 PEDF 衍生的短肽 (PDSP),可以促进角膜缘上皮干细胞以及睑板腺干细胞的生长和扩增。

再生医学是一个快速发展的领域,有可能为难以治疗的疾病提供创新疗法。许多治疗依赖于使用干细胞或细胞疗法,但这些手段在技术上都具有挑战性并且生产成本很高。为了解决这个问题,许多生物技术公司正在寻找替代方法来提高再生医学治疗的功效,同时降低成本,并提高可及性。

使用多肽等新疗法提供了一种不同的方法,这些多肽可以刺激身体自身的细胞在损伤部位进行修复和再生,同时避免体外细胞培养所涉及的不确定性。开发再生肽提供了一个令人兴奋的机会,可以以负担得起的、可获得的和可预测的方式帮助患者。

干细胞治疗面临挑战:

干细胞疗法已用于广泛的生物医学应用,从用皮肤移植治疗烧伤患者,到通过将间充质干细胞注射到受影响的关节中来改善骨关节炎症状。然而,迄今为止,成功的案例并不多见。治疗结果通常不一致,患者之间的差异很大,部分原因是干细胞的脆弱性。尽管随着时间的推移,对它们的特性和培养条件的了解有所改善,但干细胞仍可能会改变其表面标志物,并在细胞生长和分裂过程中失去自我更新和分化的能力,从而降低治疗效果。

干细胞的来源也面临伦理争议。如今,最常见的是诱导多能干细胞或造血干细胞(从脐带血中提取和衍生的干细胞),但这些细胞很难生产。此外,只有专业的医疗中心或设施才能满足细胞生长所需的高度特殊的条件。这意味着为一个疗程产生和维持足够的干细胞的成本往往很高,从而降低了患者的可及性。

为了应对干细胞研究所面临的挑战,许多生物技术公司正在研究可以诱导组织再生以修复损伤和恢复身体功能的其他药物或治疗方法。

再生医学的另一种方法是使用新型肽来刺激和再生患者自身的干细胞,以加速愈合过程并修复受损组织。例如,色素上皮衍生因子 (PEDF) 是一种多功能蛋白质,已知具有抗炎和抗血管生成功能,这意味着它可以抑制新血管的生长。此外,PEDF具有支持神经元生长、存活的能力。许多研究表明,一种称为 PEDF 衍生的短肽 (PDSP),可以促进角膜缘上皮干细胞以及睑板腺干细胞的生长和扩增。因此,它可以通过刺激角膜干细胞增殖和分化、抗炎和睑板腺恢复来加速角膜修复过程,从而用于治疗干眼症。

PDSP 还被证明可以促进间充质干细胞的生长,这些干细胞可以分化成多种组织类型,包括骨骼、软骨、肌肉和脂肪细胞以及结缔组织。因此,它有可能通过促进软骨再生、修复损伤和缓解关节疼痛来治疗其他疾病,例如骨关节炎。

 

原始出处:

https://www.pharmatimes.com/magazine/2022/januaryfebruary_2022/a_peptide_approach_to_regenerative_medicine

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分化路径远比我们想象的复杂和脆弱,更好地了解分化的途径还可以帮助我们理解先天性心脏和其他方面的缺陷,这些缺陷部分是由有缺陷的分化引起的。

诺奖10年,干细胞领域再突破!首次获得受精卵分裂仅3天的胚胎细胞

研究者们开发了一种非转基因、快速且可控的“鸡尾酒”细胞重编程方法,能够将人的多能干细胞转化为全能性的8细胞期胚胎样细胞,即相当于受精卵发育3天状态的全能干细胞。

全身性DKK1中和作用增强人类脂肪来源的干细胞介导的骨修复

全世界每年有数以百万计的外科手术都在解决骨不愈合的问题,这些骨科包括神经颅骨科、整形、口腔手术。

干细胞治疗早产儿支气管肺发育不良(BPD):具有治疗潜力

支气管肺发育不良(BPD)是一种慢性肺疾病,发生在接受长期呼吸机和氧气治疗的早产儿中。尽管最近在新生儿重症监护医学领域取得了进步,但BPD仍然是导致早产儿死亡以及长期呼吸道和神经系统疾病的主要原因。

世界首例:干细胞成功治疗糖尿病患者,让其重新产生胰岛素

1922年,班廷等人发现并提纯了胰岛素,将其成功应用于糖尿病的治疗,这一发现拯救了千千万万的糖尿病患者,尤其是1型糖尿病患者。

拓展阅读

南京大学曹毅/王炜/蒋青/薛斌团队《自然·通讯》:力信号时空可控水凝胶用于干细胞辅助骨再生

干细胞在组织工程有前景但临床推广遇阻,南京大学团队开发可编程时空力学性能大孔水凝胶,实现干细胞高效骨再生,突破传统瓶颈,应用前景广。

中山大学冯敏/海南大学郭羚团队《ACS Nano》:干细胞安装便携式微环境净化器,助力瘫痪小鼠重获运动能力

中山大学冯敏教授团队和海南大学郭羚教授团队合作研发出 “安装便携式微环境净化器的干细胞” 增效修复体系,能提升间充质干细胞治疗效果,促进脊髓损伤小鼠运动功能恢复,具有广泛应用前景。

Cell子刊:我国学者发文母体肠道微生物群影响子代干细胞的功能

母体肠道微生物群对后代的发育过程有至关重要的作用,可通过影响后代干细胞特性,进而对后代的生理和长期健康产生深远影响,这一发现为基于微生物群对后代早期生命发育的干预策略提供了重要靶点。

Nature子刊:国家纳米科学中心赵瑞芳等利用肿瘤细胞和诱导多能干细胞共有的表面抗原开发出了有效预防性癌症疫苗!

该研究利用诱导多能干细胞(iPSC)与肿瘤细胞之间的共同抗原特性,开发了一种新型疫苗。

长寿的秘诀,被针对“百岁老人”的干细胞研究揭开

本研究揭示了通过研究百岁老人的干细胞来探索健康长寿的生物学基础。未来,这些发现可能有助于开发新的治疗策略,以改善老年人的生活质量和健康寿命。

JNNP:北京协和医院发文人神经干细胞鼻内移植治疗帕金森病的安全性和初步疗效的一期研究

鼻内移植神经干细胞代表了治疗 PD 的新途径,并且具有更大的应用前景。