The group directed by Prof. Guinovart is involved in several projects on glycogen metabolism and its dysfunctions in diabetes and Lafora disease. Studies on glycogen metabolism have allowed the identification of many enzymes and intermediate metabolites involved in the synthesis and degradation of this polysaccharide. However, new factors and processes that participate in glycogen regulation are constantly being discovered. Moreover, data on the mechanisms of control in distinct organs and in diverse physiological conditions are incomplete. The alteration of one of these mechanisms may lead to serious pathologies such as diabetes mellitus and Lafora disease. The discovery of compounds that counteract the alterations of glucose metabolism is of potential interest for the treatment of diabetes mellitus.
- To study the mechanisms of glucose storage in the form of glycogen in liver, muscle and brain and its alterations in diabetes and neurological disorders.
- To identify and characterize novel compounds with anti-diabetic action.
- To identify novel potential molecular targets for the design of anti-diabetic compounds.
1) To characterise the physiological role of glycogen in the CNS and in particular in neurons.
a) To study the molecular changes associated with the lack of glycogen in the brain.
b) To further demonstrate the presence of glycogen in neurons and analyse its role in the normal functioning of this cell type.
2) To study the pathological consequences of neuronal glycogen accumulation in pathological conditions and aging.
a) To further examine the molecular mechanism(s) of neurodegeneration induced by the accumulation of glycogen.
b) To address the reversibility of abnormal glycogen accumulation in Lafora disease.
c) To study the role of neuronal glycogen accumulation in the etiopathogeny of ALS, diabetic complications, and aging.
3) To analyse the consequences of abnormal accumulation of glycogen in muscular glycogenoses.
a) To study the consequences of the over-accumulation of glycogen in skeletal muscle.
b) To examine the contribution of glycogen accumulation in neurons to the physiopathology of Pompe disease.
4) To analyse the role of hepatic glycogen in feeding behaviour.
a) To study how the amount of liver glycogen regulates food intake.
b) To determine hepatic ATP involvement in food intake.
5) To revisit the role of glycogenin in glycogen synthesis.
a) To characterise an animal model lacking glycogenin (GYG).
b) To study other possible functions of GYG besides glycogen initiation.