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Published on: August 14, 2013
High glucose concentrations stimulate renal papillary phosphatidylcholine biosynthesis
C P Setton-Avruj1, E H Speziale, N B Sterin-Speziale
1Departamento de Química Biológica, Química Biológica Patológica, Universidad de Buenos Aires, Argentina.
Experimental Nephrology
|September 11, 2001
Summary
High glucose concentrations reversibly increase renal phosphatidylcholine (PtdCho) biosynthesis in control rats. However, diabetes causes a permanent PtdCho accumulation, potentially linked to kidney damage.
Area of Science:
- Biochemistry
- Nephrology
- Cell Biology
Background:
- High glucose concentration (HGC) impacts cellular processes.
- Phosphatidylcholine (PtdCho) is a key phospholipid in cell membranes.
- Diabetes is associated with kidney complications.
Purpose of the Study:
- To investigate the effects of HGC on renal PtdCho biosynthesis.
- To differentiate the impact of transient HGC from chronic diabetes on PtdCho levels.
- To explore the mechanisms underlying glucose-induced PtdCho changes.
Main Methods:
- Studied PtdCho biosynthesis in control and diabetic rat models.
- Utilized deoxyglucose to probe glucose responsiveness.
- Employed neomycin to assess phospholipase C involvement.
- Measured CDP-choline: 1,2-diacylglycerol cholinephosphotransferase activity.
Main Results:
- HGC increased papillary PtdCho biosynthesis in control rats, a transient effect.
- Chronic diabetes led to a further, persistent increase in PtdCho.
- The glucose effect was dependent on extracellular glucose levels and mediated by a pathway sensitive to neomycin, but distinct from the diabetic effect.
- Diabetes increased CDP-choline: 1,2-diacylglycerol cholinephosphotransferase activity.
Conclusions:
- Transient high glucose induces a reversible PtdCho increase.
- Diabetes causes irreversible PtdCho accumulation, potentially contributing to papillary necrosis.
- Distinct mechanisms underlie glucose-responsive and diabetes-induced PtdCho changes.
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