Abstract：
:Levels of erythrocyte glycolytic intermediates after the phosphofructokinase (PFK) step, including 2,3-bisphosphoglycerate (2,3-DPG), were decreased at rest in patients from separate families with type VII glycogenosis. The concentration of 2,3-DPG was about half of the normal control value during a period of unrestricted daily activity but was further decreased to one third of normal after a one-day bed rest. Mild ergometric exercise rapidly increased the levels of fructose-1,6-bisphosphate, dihydroxyacetone phosphate plus glyceraldehyde-3-phosphate, and 2,3-DPG in patients' circulating erythrocytes but did not in those of normal subjects. This indicated that a crossover point at the PFK step in glycolysis disappeared after physical exercise and, consequently, the 2,3-DPG concentration, which had decreased because of blockage of the PFK step, was restored considerably. This apparently exercise-related alteration in intermediary metabolism at the beginning of glycolysis was reproduced in vitro by incubating normal erythrocytes in the presence of inosine or ammonia, both of which have increased levels in circulating blood during and after exercise in this disorder. We conclude that physical activity in addition to a genetic deficiency in erythrocyte PFK affects glycolysis in erythrocytes in type VII glycogenosis and that myogenic factors released from exercising muscles may be responsible for this change.
journal_name
Bloodjournal_title
Bloodauthors
Shimizu T,Kono N,Kiyokawa H,Yamada Y,Hara N,Mineo I,Kawachi M,Nakajima H,Wang YL,Tarui Ssubject
Has Abstractpub_date
1988-04-01 00:00:00pages
1130-4issue
4eissn
0006-4971issn
1528-0020journal_volume
71pub_type
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