Human embryonic stem cells (hESCs) have been a useful tool in the study of the embryo development and could be used by drug developing companies to create disease models and assist in the production of new medicines. One of the models that has been studied before, is the development of the pancreas. Scientists have obtained mixed results so far in the generation of functional pancreatic  cells from hESCs. We studied the differentiation potential of hESCs. As purinergic signalling is involved in may physiological processes, including cell proliferation and differentiation, a study of purinergic signalling in hESCs would help us deeper understand the hESC physiology. In order to study the purinergic profile of hESCs we established a culture system that allowed the transfer and attachment of pluripotent hESC colonies on glass coverslips. We then studied the functional purinergic profile of hESCs and found that they do not express functional P2X1 receptors, but they do express functional P2Y6 receptors, which might be implicated in the hESC differentiation. In parallel to these studies, we developed a reporter gene lentivirus, where the mouse Pdx-1 promoter area controlled the expression of a reporter fluorochrome, eGFP. We managed to generate a functional lentivirus, however, further analysis is needed in order to be able to use it in developmental studies. Finally, we tested the hypothesis that glucose affects the differentiation of hESCs towards pancreatic endoderm. Our preliminary results suggested that glucose does affect the differentiation potential of hESCs.