Injectable `smart sponges` may revolutionise diabetes treatment

 A new drug delivery technique for diabetes treatment has been developed, in which a sponge-like material surrounds an insulin core. 

The sponge expands and contracts in response to blood sugar levels to release insulin as needed. 

The technique could also be used for targeted drug delivery to cancer cells.

"We wanted to mimic the function of health beta-cells, which produce insulin and control its release in a healthy body," Dr. Zhen Gu, lead author of the paper.

"But what we`ve found also holds promise for smart drug delivery targeting cancer or other diseases," the researcher said. 

The researchers created a spherical, sponge-like matrix out of chitosan, a material found in shrimp and crab shells. 

Scattered throughout this matrix are smaller nano-capsules made of a porous polymer that contain glucose oxidase or catalyse enzymes. 

The sponge-like matrix surrounds a reservoir that contains insulin. 

The entire matrix sphere is approximately 250 micrometers in diameter and can be injected into a patient.

When a diabetic patient`s blood sugar rises, the glucose triggers a reaction that causes the nano-capsules  enzymes to release hydrogen ions. 

Those ions bind to the molecular strands of the chitosan sponge, giving them a positive charge. 

The positively charged chitosan strands then push away from each other, creating larger gaps in the sponge`s pores that allow into the bloodstream. 

As the insulin is released, the body`s glucose levels begin to drop. This causes the chitosan to lose its positive charge, and the strands begin to come back together. 

This shrinks the size of the pores in the sponge, trapping the remaining insulin.


ps- this is only for information, always consult you physician before having any particular food/ medication/exercise/other remedies.


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