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Zinc can activate cellular acidic alpha-D-glucosidase activity.
1Department of Medical Research, Veterans General Hospital, Taipei, Taiwan, Republic of China.
Biochemical Genetics
|June 1, 1988
Summary
Metallic ions like silver, mercury, and iron inhibit acidic alpha-D-glucosidase enzyme activity in cell homogenates. However, zinc ions enhance this enzyme activity in intact cells, crucial for treating Pompe disease.
Area of Science:
- Biochemistry
- Enzymology
- Cell Biology
Background:
- Acidic alpha-D-glucosidase is vital for glycogen metabolism.
- Deficiency in this enzyme leads to type II glycogen storage disease (Pompe disease).
- Understanding enzyme characteristics is key for developing effective enzymatic therapies.
Purpose of the Study:
- To investigate the impact of metallic ions on acidic alpha-D-glucosidase activity.
- To compare the effects in both tissue homogenates and intact cells.
- To explore potential modulators for enzymatic therapy.
Main Methods:
- Assaying acidic alpha-D-glucosidase activity in lymphocyte and muscle tissue homogenates and intact cells.
- Incubating samples with various metallic ions (Ag+, Hg2+, Fe3+, Zn2+, Cu2+, Cd2+).
- Observing changes in enzyme activity following metallic ion exposure.
Main Results:
- Strong inhibition of enzyme activity by Ag+, Hg2+, and Fe3+ in homogenates.
- No significant effect from Zn2+, Cu2+, and Cd2+ in homogenates.
- Zn2+ significantly enhanced enzyme activity in intact lymphocytes and muscle cells, while Ag+, Hg2+, and Fe3+ showed suppression.
Conclusions:
- Metallic ions differentially affect acidic alpha-D-glucosidase activity depending on the cellular context (homogenate vs. intact cells).
- Zinc ions show potential as activators for this enzyme in intact cells.
- Findings contribute to a better understanding of the enzyme for improved Pompe disease treatment.