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CSF insulin-like growth factor-1 in infantile neuronal ceroid lipofuscinosis
R Riikonen1, S L Vanhanen, J Tyynelä
1University Hospital of Kuopio, Helsinki, Finland. raili.riikonen@kolumbus.fi
Insights
Infantile neuronal ceroid lipofuscinosis (INCL) is linked to low insulin-like growth factor-1 (IGF-1). This finding may explain the neurodegeneration and developmental issues seen in INCL patients.
Area of Science:
- Neuroscience
- Biochemistry
- Genetics
Background:
- Infantile neuronal ceroid lipofuscinosis (INCL) is a severe, progressive neurodegenerative disorder.
- Characterized by cerebral atrophy, neuronal loss, and white matter damage, INCL typically manifests by age 3.
- INCL results from palmitoyl protein thioesterase deficiency, with potential roles for growth factors and apoptosis.
Purpose of the Study:
- To investigate the role of insulin-like growth factors (IGFs) in INCL pathogenesis.
- To measure IGF-1 and IGF binding protein 3 (IGFBP-3) levels in INCL patients.
Main Methods:
- Radioimmunoassay was used to quantify IGF-1 and IGFBP-3 in cerebrospinal fluid (CSF).
- Measurements were taken at an early disease stage, coinciding with initial myelin degradation.
- Biopsies were examined for evidence of apoptotic cell death.
Main Results:
- CSF levels of IGF-1 were significantly lower in INCL patients compared to controls.
- CSF levels of IGFBP-3 were found to be normal in INCL patients.
- Apoptotic cell death was observed in tissue samples from INCL patients.
Conclusions:
- The IGF system is crucial for neurodevelopment, myelination, and neuroprotection.
- Reduced CSF IGF-1 levels may contribute to the observed pathology in INCL.
- This suggests a potential link between IGF-1 deficiency and INCL progression.
Background:
Infantile neuronal ceroid lipofuscinosis (INCL) is a progressive encephalopathy in which the patients are severely disabled by the age of 3 years. It is characterized by cerebral atrophy, selective loss of cortical neurons, and secondary loss of axons and myelin sheaths of the white matter. INCL has been shown to result from a palmitoyl protein thioesterase deficiency. The authors suggested that insulin-like growth hormones and apoptosis might play a role in the pathogenesis of INCL.
Methods:
The authors measured insulin-like growth factor-1 (IGF-1) and IGF binding protein 3 (IGFBP-3) in the CSF of patients with INCL by radioimmunoassay at an early stage when myelin was starting to diminish.
Results:
The authors found low CSF IGF-1 but normal IGFBP-3 in patients with INCL compared with control subjects. Also, they observed apoptotic cell death in biopsies of INCL patients.
Conclusions:
Because the IGF system seems to be important for early brain development, myelination, and neuroprotection, the authors suggest that the pathology in INCL may be associated with low CSF IGF-1.