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In order to get further evidence for a mandatory involvement of epidermal growth factor (EGF) in the neutrophic action of vitamin B12 (cobalamin (Cbl)) in the central nervous system (CNS) of the rat, we observed the effects of repeated intracerebroventricular (ICV) microinjections of EGF in rats made Cbl-deficient through total gastrectomy. Morphometric analysis demonstrated a significant reduction in both intramyelinic and interstitial edema in the white matter of the spinal cord (SC) of totally gastrectomized (TGX) rats after treatment. Intramyelinic and interstitial edema are characteristic of Cbl-deficient central neuropathy in the rat. Similar lesions were also present in SC white matter of rats treated with repeated ICV microinjections of specific anti-EGF antibodies without any modification in their Cbl status. These results, together with those of a previous study showing the cessation of EGF synthesis in the CNS of TGX rats, demonstrate that: a) EGF is necessarily involved in the signaling pathway of Cbl in the rat CNS; and b) the lack of a neurotrophic growth factor EGF, and not the mere withdrawal of Cbl, causes or at least contributes to neurodegenerative Cbl-deficient central neuropathy.

journal of neuropathology and experimental neurology

Further Evidence for the Involvement of Epidermal Growth Factor in the Signaling Pathway of Vitamin B<sub>12</sub>(Cobalamin) in the Rat Central Nervous System

Further Evidence for the Involvement of Epidermal Growth Factor in the Signaling Pathway of Vitamin B12(Cobalamin) in the Rat Central Nervous System

Further Evidence for the Involvement of Epidermal Growth Factor in the Signaling Pathway of Vitamin B₁₂(Cobalamin) in the Rat Central Nervous System