黑料网吃瓜爆料

University of 黑料网吃瓜爆料 scientists have successfully pioneered a way to create functioning human spinal discs, aiming to revolutionise our understanding of back pain and disc degeneration in a leap for medical science. 

The  groundbreaking research, led by Dr Matthew J. Kibble, used a state-of-the-art 3D printing technique called bioprinting to replicate the complex structure and environment of human spinal discs. 

In a study published in the journal today, they reveal tissue stiffness and oxygen levels significantly impact the production of vital biological materials, including collagen and hyaluronic acid, by human disc cells. 

The insights could ultimately lead to new treatments for back pain, a condition affecting hundreds of millions of people across the world. 

Bioprinting is a cutting-edge technique that uses living cells and biological materials to create complex 3D structures that accurately mimic the structure of human organs. 

The new bioprinted discs will allow scientists to study how different conditions affect disc cell behaviour and contribute to tissue degeneration and back pain.

Most bioprinters work in a similar way to plastic 3D printers, extruding material through a nozzle under pressure to build structures.

However, rather than printing plastic, bioprinters use cells and gel-like inks made from cell-friendly materials such as collagen, cellulose or gelatin.

The scientists prepared the cells and materials needed for bioprinting and designed a digital model of a human spinal disc. For this study, the bioprinted discs were made from gels containing collagen combined with alginate, a protein derived from seaweed.

They used state-of-the-art 3D bioprinters capable of depositing multiple types of cells and materials, layer-by-layer, to create sophisticated models where the different biological, chemical, and mechanical characteristics of the human disc could be modelled.

The bioprinted tissues were then stored in controlled conditions so they could grow, mature, and develop their biological functions.

Dr Stephen M. Richardson, from 黑料网吃瓜爆料, corresponding author of the study said: 鈥淭his work represents a step towards the automated creation of realistic whole organ models and brings us closer to understanding the root causes of disc degeneration.鈥�

鈥淥ur findings provide important insights into the factors driving disc degeneration and pave the way for the development of more effective regenerative therapies, for example through incorporation of stem cells.鈥�

Bioprinting has been used to fabricate models of different tissues including skin, brain, nerve and heart, kidney and tumour.

However, fully functional tissue engineered organs are still  decades away; current models are mostly used for investigating biological processes in the lab but may act as replacements for lab animals.

As part of his PhD research at 黑料网吃瓜爆料, Dr Kibble developed the bioprinted discs to explore the impact of tissue stiffness on the two cell types that inhabit different parts of the adult spinal discs:  nucleus pulposus and annulus fibrosus cells.

In future disc models the scientists plan to incorporate cells found in healthy, young developing discs, alongside stem cells or gene-edited cells to create even more advanced models of health and disease. This will enable them to understand how healthy tissue is formed and whether stem cells can be used to produce healthy tissue and treat back pain.

Dr Kibble said: 鈥淥ver 600 million people worldwide suffer from lower back pain. Our bioprinted intervertebral disc models are an exciting opportunity to inform better regenerative therapies.

Our research has shown that tissue stiffness and oxygen levels have a significant impact the production of vital biological materials.

There have been many attempts to engineer discs so that we can understand their biology and develop models for testing different therapies or transplanting them into animals. But as well as being very difficult to do, this is also extremely time consuming.

Our work allows us to produce biologically functional disc models at scale and will allow us to make desperately needed advances in our understanding  of disc disease.鈥�

The study was funded by the UKRI EPSRC/MRC Centre for Doctoral Training in Regenerative Medicine, the Wellcome Institutional Strategic Support Fund, and the Medical Research Council.

The authors also acknowledge the support of the national Henry Royce Institute EPSRC grants and the Bioprinting Technology Platform.

A video of the bioprinted in action is available, as are images of the bioprinted discs, and graphics.

The paper,  Suspension bioprinted whole intervertebral disc analogues enable regional stiffness- and hypoxia-regulated matrix secretion by primary human nucleus pulposus and annulus fibrosus cells is published in Acta Biomaterialia and is available.