Relations of glioma pathological grades with amyloid precursor protein content in brain glioma tissues and cerebrospinal fluid of these patients / 中华神经医学杂志

ABSTRACT

Objective:To investigate the amyloid precursor protein (APP) expression in brain glioma tissues and cerebrospinal fluid of glioma patients and their significances.Methods:(1) Fifty-six brain glioma specimens surgically resected and pathologically confirmed in our hospital from January 2015 to December 2020 were collected, including 9 with WHO grading I, 14 with WHO grading II, 18 with WHO grading III, and 15 with WHO grading IV. In addition, the necrotic brain tissues of 4 patients with hypertensive intracerebral hemorrhage during hematoma removal at the same time period were collected as controls. Western blotting and real-time quantitative PCR (RT-qPCR) were used to detect the APP protein and mRNA expressions in glioma tissues and control brain tissues, respectively. (2) The cerebrospinal fluid of above 56 patients with glioma, 4 patients with viral meningitis, 4 patients with bacterial meningitis, 4 patients with autoimmune encephalitis, 5 patients with epilepsy, 3 patients with migraine and 3 normal subjects were collected at the same time period, and the APP content in the cerebrospinal fluid of all subjects were detected by ELISA.Results:(1) Western blotting and RT-qPCR showed that the APP protein and mRNA expressions in glioma tissues of WHO grading I, II, III and IV were significantly higher than those in control brain tissues, and the APP protein and mRNA expressions in glioma tissues of WHO grading I, II, III and IV increased successively, with statistical differences ( P<0.05). There were no significant differences in APP protein and mRNA expressions between first-onset glioma and recurrent glioma in glioma tissues of WHO grading I and II ( P>0.05); while in glioma tissues of WHO grading III and IV, APP mRNA expression in recurrent glioma was statistically higher than that in first-onset glioma ( P<0.05). (2) ELISA results showed that APP content in patients with viral meningitis, bacterial meningitis, autoimmune encephalitis, epilepsy or migraine was not significantly different as compared with that in normal controls ( P>0.05). The APP content in cerebrospinal fluid of patients with WHO grading I, II, III and IV gliomas was significantly higher than that in normal controls, and the APP content in cerebrospinal fluid of patients with WHO grading I, II, III and IV gliomas increased successively, with statistical differences ( P<0.05). Conclusion:APP is highly expressed in glioma tissues and cerebrospinal fluid of patients with glioma, and its expression is significantly correlated with the pathological grades of glioma; the detection of APP expression in cerebrospinal fluid can be used as a new screening method for glioma patients.