幻肢痛大鼠脊髓背角神经元和突触数量的变化

目的 探讨幻肢痛大鼠脊髓背角神经元和突触数量的变化.方法 健康成年SD大鼠11只,雄雌不拘,体重290～300 g,随机分为2组:假手术组(S组,n=5)和单侧坐骨神经横断组(P组,n=6).术后持续观察P组大鼠自噬情况,并进行自噬评分.术后28 d时,取L3～6节段脊髓组织,分别进行尼氏染色(显示神经元)和突触素免疫组织化学染色(显示突触数量),计数手术侧和非手术侧脊髓背角神经元和突触的数量.结果 P组自术后2 d开始陆续发生自噬,自噬评分9～11分.与S组比较,P组各节段双侧脊髓背角神经元数量及L3.6节段脊髓背角突触数量差异无统计学意义(P＞0.05),手术侧L4.5节段脊髓背角突触数量增加(P＜0.05).结论 幻肢痛大鼠脊髓背角突触数量增加,神经元数量未发生变化;突触数量增加可诱发幻肢痛.     

幻肢痛大鼠脊髓背角小胶质细胞和星形胶质细胞数量的变化

目的 探讨幻肢痛大鼠脊髓背角小胶质细胞和星形胶质细胞数量的变化.方法 健康成年SD大鼠11只,雌雄不拘,体重290～300 g,采用随机数字表法,将其随机分为2组:假手术组(S组,n=5)和单侧坐骨神经横断组(SNT组,n=6).术后持续观察SNT组大鼠自噬情况,并进行自噬评分.术后28d时取L5节段脊髓组织,分别进行iba-1(标记小胶质细胞)及胶质纤维酸性蛋白(标记星形胶质细胞)免疫组化染色,进行手术侧和非手术侧脊髓背角小胶质细胞和星形胶质细胞的计数.结果 S组无一只大鼠发生自噬,SNT组术后2d开始陆续发生自噬,最高自噬评分9～11分.与S组比较,SNT组手术侧脊髓背角小胶质细胞和星形胶质细胞数量均减少(P＜0.05).结论 幻肢痛大鼠脊髓背角小胶质细胞和星形胶质细胞数量减少.     

Mercury intoxication in a 2-year-old girl: a diagnostic challenge for the physician

A 2-year-old girl presented with hypertension, anorexia and vomiting, restlessness, insomnia and acrodynia. Her blood pressure upon arrival was 145/98 mmHg. Ultrasound of the abdomen, CT scan of chest, abdomen and pelvis, and echocardiogram, were normal. Urinary levels of catecholamines were elevated, urine level of mercury was found to be high (33.2 μg/g creatinine), although blood level was normal (>0.5 μg/dl, reference value 0–4 μg/dl). Following a 1-month course of oral treatment with dimercaptosuccinic acid (DMSA) the child’s symptoms and signs resolved, and urinary mercury and catecholamines levels normalized. Mercury intoxication should be suspected in a patient with severe hypertension, personality changes and acrodynia. Normal blood levels of mercury do not exclude this diagnosis, and catecholamine levels may serve as a surrogate marker for confirmation of the diagnosis and to evaluate response to treatment.