Singapore scientists create unlimited source of human kidney cells

February 22, 2013

SINGAPORE – Researchers at the Institute of Bioengineering and Nanotechnology (IBN) have successfully generated human kidney cells under artificial conditions in the lab without using animals or organs.

Specifically, they have produced renal cells. This has not been possible until now.

This discovery has wide-reaching implications for in vitro toxicology, drug screening, disease models and regenerative medicine, said IBN Executive Director Professor Jackie Y. Ying.

“In particular, we are interested in applying our technology to develop predictive in vitro drug testing and renal toxicity models as alternatives to animal testing,” he said.

IBN Team Leader and Principal Research Scientist Dr Daniele Zink elaborated: “The kidney is a major target organ for drug-induced toxic effects. Therefore, it is important for pharmaceutical companies to find out early in the development phase whether their drugs would cause nephrotoxicity in humans.

“However, animal models are of limited predictability, and there is currently no regulatory accepted in vitro assay based on renal cells to predict nephrotoxic effects. A major problem is the lack of suitable renal cells, which may now be resolved through our discovery.”

At present, human kidney cells are extracted directly from human kidney samples. However, this method is not efficient because such samples are limited, and the extracted cells die after a few cell divisions in the petri dish.

Also, cells obtained from different samples would display variable features, depending on age, gender, health status and other conditions of the donor. Therefore, cells that have been isolated from human samples are of limited suitability for research and industry applications, which require large cell numbers.

An alternative approach is to use human renal cell lines that can be reproduced indefinitely in the lab. However, such cells may not be used in many applications due to safety issues, and their functional features have usually been changed so profoundly that they may no longer be useful toward predicting cell behaviour in the human body.

IBN’s technique, on the other hand, enables human embryonic stem cells to differentiate into renal proximal tubular-like cells. This particular kidney cell type plays an important role in kidney disease-related processes and drug clearance.

Results showed that the renal proximal tubular-like cells generated by IBN were similar to the renal proximal tubular cells isolated from fresh human kidney samples. For example, they displayed very similar gene and protein expression patterns.

Also, since human embryonic stem cells may grow indefinitely in cell culture, the IBN researchers have discovered a potentially unlimited source of human kidney cells.

The IBN researchers said they welcome industry partners to collaborate with IBN on commercialising this technology.

IBN has recently received a grant from A*STAR’s Joint Council Office Development Program to further develop predictive in vitro models for liver- and kidney-specific toxicity. This project will be conducted in collaboration with the Experimental Therapeutics Centre, the Bioinformatics Institute and the National University Health System.

Source: YourHealth, AsiaOne

Category: Education

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