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J. Biochem, 1988, Vol. 103, No. 6 903-904
© 1988 Japanese Biochemical Society

other

Fructose 2,6-Bisphosphate in Human Erythrocytes1

Matsuko Moriyasu, Masaaki Yamamoto and Naotaka Hamasaki2

Department of Biochemistry, Fukuoka University School of Medicine, Jonan-ku, Fukuoka, Fukuoka 814-01

2To whom correspondence should be addressed.

The fructose 2,6-bisphosphate concentrations in unwashed, washed, and leukocyte-free erythrocytes were compared. The concentration in washed red cells was 31ą15 pmol per ml of cells (meanąS.D., n=6). The concentration in unwashed erythrocytes was at least twofold higher, but the value in washed red cells was not due to leukocyte contamination because it did not decrease further when washed cells were passed through an Imgard column, which would have removed any remaining leukocytes. No platelets were detected among the washed erythrocytes. Thus, the concentration in erythrocytes after washing was ascribed solely to these cells. The fructose 2,6-bisphosphate concentration did not change when the glycolytic activity varied with pH, indicating that this compound is not involved in the regulation of carbohydrate metabolism in erythrocytes under these conditions.

1This study was supported in part by grants from the Ministry of Education, Science and Culture of Japan, the Ministry of Health and Welfare of Japan, the Central Research Institute of Fukuoka University, the Ryoichi Naito Foundation for Medical Research, the Naito Foundation, and the Fukuoka University Hospital Clinical Research Fund.


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