Faculty Advisor

Hobey, William D.


Chloride dependent K cotransport channel in human erythrocytes was investigated, in attempts to further elucidate the mechanism of control in regulatory volume decrease activated by Ca? and propranolol. The effects of a phosphotyrosine phosphatase inhibitor, sodium orthovanadate and the protein kinase inhibitors, staurosporine and chelerythrine chloride were tested. Tests were conducted by mixing the inhibitor with washed erythrocytes, and buffered salline solution. A specialized computer program and apparatus measured the K efflux. Sodium orthovanadate inhibited K efflux at 1mM and 5mM; effects at higher concentrations were obscured by vanadate induced flux. Staurosporine and chelerythrine also inhibited K efflux. It was concluded that there is a protein kinase, possibly PKC, in the Ca?/propranolol pathway, and a phosphotyrosine further downstream.


Worcester Polytechnic Institute

Date Accepted

January 2002



Project Type

Major Qualifying Project


Restricted-WPI community only

Advisor Department

Chemistry and Biochemistry