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Some glycolytic enzymes in normal cerebrospinal fluid, brain tissue and blood plasma of infants
Insights
Enzyme activities in infant cerebrospinal fluid (CSF) primarily originate from brain tissue, not blood plasma. This finding suggests CSF enzyme analysis may help detect brain tissue damage.
Area of Science:
- Biochemistry
- Neuroscience
- Pediatrics
Background:
- Glycolytic enzymes and others are crucial for brain metabolism.
- Understanding enzyme origins in cerebrospinal fluid (CSF) is important for diagnosing neurological conditions.
Purpose of the Study:
- To measure activities of key glycolytic enzymes (hexokinase, phosphofructokinase, pyruvate kinase, lactate dehydrogenase), glycerol-1-phosphate dehydrogenase, and (Mg2+)ATPase.
- To determine the origin of these enzyme activities in infant CSF and blood plasma.
- To assess the potential of CSF enzyme analysis for detecting brain tissue damage.
Main Methods:
- Enzyme activity assays were performed on CSF and blood plasma from 12 healthy infants (2-18 months).
- Supernatants from infant brain tissue slices (obtained during neurosurgery) were also analyzed.
- Activities of hexokinase, phosphofructokinase, pyruvate kinase, lactate dehydrogenase, glycerol-1-phosphate dehydrogenase, and (Mg2+)ATPase were quantified.
Main Results:
- Enzyme activities in infant CSF and blood plasma were measured.
- Enzyme activities in CSF and blood plasma were found to be independent of each other.
- Enzyme activities in CSF largely mirrored those found in brain tissue, suggesting a brain origin.
Conclusions:
- The primary source of measured enzyme activities in infant CSF is brain tissue.
- CSF enzyme levels, particularly lactate dehydrogenase (LDH), may serve as biomarkers for brain tissue damage.
Abstract:
The activities of several glycolytic enzymes (hexokinase, phosphofructokinase, pyruvate kinase, lactate dehydrogenase) as well as glycerol-1-phosphate dehydrogenase and (Mg2+)ATPase in normal cerebrospinal fluid (CSF) and blood plasma samples, from 12 healthy infants, aged 2-18 months, and in supernatants from brain tissue slices, taken during neurosurgical operations from infants of the same range of age were estimated. The values obtained confirm the high activity of the above enzymes found in animal brains, and indicate an independence of these activities in blood plasma and CSF. The origin of the activities of the investigated enzymes in CSF seems to be mainly, if not, exclusively, from brain tissue. This might be useful for detection of brain tissue damage as was earlier proven with LDH activity in CSF.