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营养代谢对软骨组织形成的影响。

Effect of nutrient metabolism on cartilaginous tissue formation.

机构信息

Department of Chemical Engineering, Ryerson University, Toronto, Ontario, Canada.

Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Ontario, Canada.

出版信息

Biotechnol Bioeng. 2021 Oct;118(10):4119-4128. doi: 10.1002/bit.27888. Epub 2021 Jul 23.

Abstract

A major shortcoming in cartilage tissue engineering is the low biosynthetic response of chondrocytes. While different strategies have been investigated, a novel approach may be to control nutrient metabolism. Although known for their anaerobic metabolism, chondrocytes are more synthetically active under conditions that elicit mixed aerobic-anaerobic metabolism. Here, we postulate this metabolic switch induces HIF-1α signaling resulting in improved growth. Transition to different metabolic states can result in the pooling of metabolites, several of which can stabilize HIF-1α by interfering with PHD2. Chondrocytes cultured under increased media availability accelerated tissue deposition with the greatest effect occurring at 2 ml/10 cells. Under higher media availability, metabolism switched from anaerobic to mixed aerobic-anaerobic. Around this transition, maximal changes in PHD2 activity, HIF-1α expression, and HIF-1 target gene expression were observed. Loss-of-function studies using YC-1 confirmed the involvement of HIF-1. Lastly, targeted metabolomic studies revealed that intracellular lactate and succinate correlated with PHD2 activity. This study demonstrates that cartilaginous tissue formation can be regulated by nutrient metabolism and that this response is mediated through changes in HIF-1α signaling. By harnessing this newly identified metabolic switch, engineered cartilage implants may be developed without the need for sophisticated methods which could aid translation to the clinic.

摘要

软骨组织工程的一个主要缺点是软骨细胞的生物合成反应较低。虽然已经研究了不同的策略,但一种新的方法可能是控制营养代谢。尽管已知软骨细胞为无氧代谢,但在引发混合需氧-无氧代谢的条件下,它们具有更高的合成活性。在这里,我们假设这种代谢转换诱导 HIF-1α 信号传导,从而导致生长改善。向不同代谢状态的转变可能导致代谢物的汇集,其中几种代谢物可以通过干扰 PHD2 来稳定 HIF-1α。在增加的培养基可用性下培养的软骨细胞加速了组织沉积,最大效果发生在 10 细胞/2ml 时。在更高的培养基可用性下,代谢从无氧切换到混合需氧-无氧。在这种转变周围,观察到 PHD2 活性、HIF-1α 表达和 HIF-1 靶基因表达的最大变化。使用 YC-1 进行的功能丧失研究证实了 HIF-1 的参与。最后,靶向代谢组学研究表明细胞内的乳酸盐和琥珀酸盐与 PHD2 活性相关。这项研究表明,软骨组织的形成可以通过营养代谢来调节,并且这种反应是通过 HIF-1α 信号的变化介导的。通过利用这种新发现的代谢转换,可能开发出不需要复杂方法的工程化软骨植入物,从而有助于向临床转化。

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