Medindia

X

Diabetes - New Treatment Approach At John Hopkins

by Medindia Content Team on  June 8, 2006 at 5:36 PM Diabetes News   - G J E 4
Diabetes - New Treatment Approach At John Hopkins
Diabetes, a modern disease, can be now treated by a new approach involving release of sugar by liver cells. Initial experiment were made with mice by scientists at John Hopkins Institute of Basic Biomedical Sciences and McKusick-Nathans Institute for Genetic Medicine.
Advertisement

The discovery by researchers in Hopkins' Institute of Basic Biomedical Sciences and McKusick-Nathans Institute for Genetic Medicine reveals that a protein called GCN5 is critical for controlling a domino-like cascade of molecular events that lead to the release of sugar from liver cells into the bloodstream. Understanding the role of GCN5 in maintaining blood sugar levels is leading to a clearer picture of how the body uses sugar and other nutrients to make, store and spend energy.

Advertisement
'Understanding the ways that energy production and use are controlled is crucial to developing new drugs and therapies,' says the report's senior author, Pere Puigserver, Ph.D., an assistant professor of cell biology at Hopkins.

The inability to properly regulate blood sugar levels leads to conditions like obesity and diabetes. Both type 1 and type 2 diabetes cause blood sugar levels to stay too high, which can lead to complications like blindness, kidney failure and nerve damage.

'Diabetes is a really big problem, even when patients are given insulin and stay on strict diets,' says Carles Lerin, Ph.D., a postdoctoral fellow in cell biology at Hopkins and an author of the report. 'In the absence of a cure for the disease, we are really trying to focus on finding better treatment because currently available methods just don't work that efficiently,' he says.

The body keeps blood sugar - known as glucose - within a narrow range. Extra glucose floating through the bloodstream, which is common after eating a meal, is captured and kept in the liver. When blood glucose runs low, the liver releases its stores back into the bloodstream. When those reserves are tapped out, liver cells turn on genes to make more glucose to fuel the body.

The research team found that GCN5 chemically alters another protein called PGC-1alpha that normally turns on a set of genes to manufacture enzymes required for glucose release. When GCN5 is fully functional in liver cells, this cascade is turned off and glucose is not released from those cells. Removal of functional GCN5 from liver cells restores the cells' ability to release glucose.

The researchers showed that GCN5 alters its target, sabotaging it by adding a chemical tag called an acetyl group. By using molecules that glow fluorescently, the researchers saw under high-power microscopes that GCN5 carries its tagged target to a different location in the cell's nucleus - sequestering it away from the genes it's normally meant to turn on.

'GCN5 has been generally shown to turn on genes. No one knew that GCN5 could be used to turn off pathways' says Lerin. 'It was a bit of a surprise.'

When the researchers put GCN5 into live mice, they found that it can in fact decrease blood glucose levels. Liver cells in mice that were given no food for 16 hours actively release glucose into the bloodstream. Introducing GCN5 into their livers, however, causes blood glucose levels in these mice to be reduced.

'These results show that changing GCN5 is sufficient to control the sugar balance in mice,' says Puigserver. 'Therefore, GCN5 has the potential to be a target for therapeutic drug design in the future.'

Source: Eurekalert
Advertisement

Post your Comments

Comments should be on the topic and should not be abusive. The editorial team reserves the right to review and moderate the comments posted on the site.
User Avatar
* Your comment can be maximum of 2500 characters
Notify me when reply is posted I agree to the terms and conditions
Just speculation, but I think what they're saying is that the glucose in blood may not be the result of direct digestion, but rather is extracted from food and stored, then released? At least some or all of it anyways, so by reducing or eliminating glucose produced by the liver you can reduce a diabetic's blood sugar to acceptable levels without insulin? It sounds more like this would prevent hyperglycemia than treat diabetes, since we'd still need insulin regardless.
guest Wednesday, June 21, 2006
Diabetes is increased blood sugar level.How come release of sugar from liver be a treatment for diabetes it is going to add on to sugar level.Please i request you to send me a mail clarifying my doubt Thanking you
guest Sunday, June 11, 2006

You May Also Like

Advertisement
View All