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Impaired glucose transport in polymorphonuclear leukocytes in glycogen storage disease Ib
N Bashan1, R Potashnik, Y Hagay
1Pediatric Research Laboratory, Soroka Medical Center, Beer Sheva, Israel.
Abstract:
A study of 2-deoxyglucose transport into polymorphonuclear leukocytes (PMN) was performed in three patients with glycogen storage disease (GSD) type Ib. The rate of 2-deoxyglucose transport into GSD Ib PMN was 30% of that of cells of normal controls. In GSD Ib lymphocytes, transport was normal. Km for 2-deoxyglucose in the PMN of one patient was within the normal range. The reduced transport was not due to the elevation in Km for 2-deoxyglucose nor to the decreased rate of phosphorylation of 2-deoxyglucose. The striking limitation of glucose transport across the cell membrane may account for the impairment of leukocyte function which is characteristic of GSD Ib.
Insights
Patients with glycogen storage disease (GSD) type Ib exhibit impaired 2-deoxyglucose transport in polymorphonuclear leukocytes (PMN). This cellular defect in glucose uptake may explain the characteristic leukocyte dysfunction seen in GSD Ib.
Area of Science:
- Biochemistry
- Cell Biology
- Immunology
Background:
- Glycogen storage disease (GSD) type Ib is a rare metabolic disorder.
- Leukocyte dysfunction is a hallmark of GSD Ib, but its underlying mechanisms are not fully understood.
- Glucose transport is crucial for cellular energy metabolism and immune cell function.
Purpose of the Study:
- To investigate the rate of 2-deoxyglucose transport in polymorphonuclear leukocytes (PMN) from patients with GSD type Ib.
- To determine if impaired glucose transport contributes to the leukocyte dysfunction observed in GSD Ib.
- To explore the kinetic parameters of glucose transport in GSD Ib PMN.
Main Methods:
- Studied 2-deoxyglucose transport in PMN and lymphocytes from three GSD Ib patients.
- Compared glucose transport rates and Michaelis constant (Km) with normal controls.
- Assessed 2-deoxyglucose phosphorylation rates.
Main Results:
- PMN from GSD Ib patients showed a 70% reduction in 2-deoxyglucose transport compared to normal controls.
- Glucose transport in GSD Ib lymphocytes was found to be normal.
- The reduced transport rate was not attributed to altered Km or phosphorylation of 2-deoxyglucose.
Conclusions:
- A significant impairment in glucose transport across the cell membrane exists in PMN of GSD Ib patients.
- This defect in glucose uptake is a likely cause of the impaired leukocyte function characteristic of GSD Ib.
- Further research into glucose transporter function in GSD Ib is warranted.