Homophilic Interaction of CD99 via Its Extracellular Domain / 대한면역학회지

No abstract available.

Clinicopathologic study of Castleman's disease in Korea

Castleman's disease represents an atypical lymphoproliferative disorder, infrequently associated with various immunologic abnormalities or subsequent development of malignancy such as Kaposi sarcoma, malignant lymphoma and plasmacytoma. Its clinicopathologic features depend on various etiologic factors such as Kaposi sarcoma herpesvirus (KSHV), oversecretion of IL-6, adhesion molecule and follicular dendritic cell dysplasia, etc. To investigate the relationship of Castleman's disease (CD) and the above factors, we reviewed 22 cases of CD. Four cases of KSHV positive CD were detected, all multicentric, plasma cell type, and these cases displayed prominent vascular proliferation, characteristic 'Kaposi-like lesion'. IL-6 and CD54 positive mononuclear cells were scattered in interfollicular areas of KSHV positive cases. Follicular dendritic cell hyperplasia, vascular proliferation, expression of IL-6 and CD54 did not show any significant difference between solitary vs multicentric type, and plasma cell type vs hyaline vascular type. Our study suggests that KSHV positive CD reveals unique pathologic features, and the probable relationship of KSHV and IL-6 and CD54 is discussed.

Congenital Esophageal Stenosis: with Special Reference to Diagnosis and Postoperative Complications

PURPOSE: Congenital esophageal stenosis(CES) is one of the rare causes of recurrent vomiting during infancy and childhood. We studied the diagnostic and therapeutic tools and postoperative complications for early diagnosis and adequate management of CES. METHODS: Fourteen cases of CES were evaluated for clinical manifestations, findings of esophagogram and esophagoscopy, classification of pathologic findings and postoperative complications. RESULTS: Most common clinical manifestations at onset were non-projectile vomiting(14), dysphagia to solids(13). Age at onset of symptoms corresponded with the introduction of solids in 11 cases. Esophagogram showed segmental stenosis of variable length in the lower portion of the esophagus in all cases with marked proximal dilatation in 11 cases. Esophagoscopy revealed no signs of esophagitis or ulcer at the area of stenosis. Segmental resection and primary anastomosis were performed as a definitive treatment modality in all cases except one with fibromuscular stenosis. Bronchial cartilage were present in all cases of tracheobronchial remnants(10). Abnormal arrangement and thickening of muscularis mucosae and inner circular muscle were found in all cases of fibromuscular stenosis(4). Postoperative complications were gastroesophageal reflux(5), stricture of anastomotic sites, reflux esophagitis, and so on. CONCLUSION: CES is rare but should be considered as a cause of recurrent vomiting and dysphagia to solid food beginning in infancy and childhood especially in the weaning period. Esophagogram and esophagoscopy are useful tools for diagnosis and differential diagnosis. The stricture of anastomosis site, gastroesophageal reflux and esophagitis need to be evaluated in the follow-up postoperative periods.

Solid and Papillary Epithelial Neoplasm of the Pancreas in Children

Six children with solid and papillary epithelial neoplasm of the pancreas were studied retrospective manner. There were 2 boys and 4 girls in this series. The mean age at operation was 11 years (range, 8 to 13 years). There were three incidental abdominal masses, two nontender abdominal masses and one tender abdominal mass. The size ranged from 6.5x6.0cm to 10.5x8.0cm. Five tumors were located in the head of pancreas, whereas one tumor was in the tail of pancreas. On exploration, all patients had no local invasion or metastasis. All patients underwent complete resection, which included three pylorus-preserving pancreaticoduodenectomy, two Whipple's operation and one distal pancreatectomy. All patients had the characteristic histologic pattern of a solid and papillary epithelial neoplasm of the pancreas. All patients are alive with a mean follow up of 5.0 years (range, 0.5 to 12.0 years) without recurrence. Compare to the adult, solid and papillary epithelial neoplasm of the pancreas in children had a slight higher incidence in male. We speculate that this tumor have the characteristic of low-grade malignancy. So complete resection is the treatment of choice for the neoplasm arising anywhere in the pancreas.

Overexpression of tissue inhibitors of metalloproteinase-1 and -2 in the stroma of gastric cancer

The fundamental event of cancer invasion and metastasis is the complicated interaction of cancer cells with host cells, in which event, a number of proteases and their inhibitors are involved. Matrix metalloproteinases are the potent proteases in degrading the basement membrane and extra cellular matrix and are inhibited by specific endogeneous inhibitors, tissue inhibitors of metalloproteinases-1(TIMP-1) and TIMP-2. The expression of mRNA for TIMP-1 and -2 was investigated by Northern blot analysis in specimens taken from 27 patients with primary gastric adenocarcinoma; 25 samples from the primary site, six from the metastatic lymph nodes and two from the peritoneal fluids. The expression for TIMP-1 and -2 was compared in primary gastric cancer tissues, metastatic lymph nodes and normal gastric mucosae. TIMP-1 mRNA was overexpressed in 24 (96%) out of 25 primary cancer tissues compared with the paired normal mucosae, while TIMP-2 was in 10 (40%). In six specimens of metastatic lymph nodes, TIMP-1 and -2 were overexpressed in 6 (100%) and 4 (67%) specimens, respectively. Of two specimens prepared from the peritoneal fluids, all specimens overexpressed TIMP-1 compared with the those of primary cancer tissues, while one (50%) specimen overexpressed TIMP-2. Immunohistochemical staining was done to investigate the localization of TIMP-1 and -2, demonstrating that the immunoreactivity for TIMP-1 and -2 was clearly detected in the cytoplasm of the stromal cells. These results suggest that both TIMP-1 and -2 are overexpressed by stromal cells in most of primary and some metastatic gastric cancer tissues and that TIMP-1 and TIMP-2, produced by stromal cells, may play an important role in inhibiting the proteolytic activity of matrix metalloproteinases originated from cancer cells, in gastric cancer.

Overexpression of tissue inhibitors of metalloproteinase-1 and -2 in the stroma of gastric cancer

The fundamental event of cancer invasion and metastasis is the complicated interaction of cancer cells with host cells, in which event, a number of proteases and their inhibitors are involved. Matrix metalloproteinases are the potent proteases in degrading the basement membrane and extra cellular matrix and are inhibited by specific endogeneous inhibitors, tissue inhibitors of metalloproteinases-1(TIMP-1) and TIMP-2. The expression of mRNA for TIMP-1 and -2 was investigated by Northern blot analysis in specimens taken from 27 patients with primary gastric adenocarcinoma; 25 samples from the primary site, six from the metastatic lymph nodes and two from the peritoneal fluids. The expression for TIMP-1 and -2 was compared in primary gastric cancer tissues, metastatic lymph nodes and normal gastric mucosae. TIMP-1 mRNA was overexpressed in 24 (96%) out of 25 primary cancer tissues compared with the paired normal mucosae, while TIMP-2 was in 10 (40%). In six specimens of metastatic lymph nodes, TIMP-1 and -2 were overexpressed in 6 (100%) and 4 (67%) specimens, respectively. Of two specimens prepared from the peritoneal fluids, all specimens overexpressed TIMP-1 compared with the those of primary cancer tissues, while one (50%) specimen overexpressed TIMP-2. Immunohistochemical staining was done to investigate the localization of TIMP-1 and -2, demonstrating that the immunoreactivity for TIMP-1 and -2 was clearly detected in the cytoplasm of the stromal cells. These results suggest that both TIMP-1 and -2 are overexpressed by stromal cells in most of primary and some metastatic gastric cancer tissues and that TIMP-1 and TIMP-2, produced by stromal cells, may play an important role in inhibiting the proteolytic activity of matrix metalloproteinases originated from cancer cells, in gastric cancer.

Enhanced expression of the c-myc protooncogene in human intracranial meningiomas

We examined the alteration and expression of c-myc protooncogene in 11 human intracranial meningiomas using Southern blot, Northern blot and immunohistochemical techniques. Southern blot showed neither amplification nor rearrangement but Northern blot and immunohistochemical study revealed enhanced expression of the c-myc gene. Immunohistochemically, c-myc product was found in all of the 11 cases and seven of these cases showed an above moderate degree of immunoreaction in semiquantitative analysis. Loss of heterozygosity at IGLC2 locus on chromosome 22 was detected in four of the 8 informative cases. But extent and intensity of immunoreactivity did not correlated with loss of heterozygosity on chromosome 22. These genetic changes may play important roles in the pathogenesis of human intracranial meningioma.

Uranyl Nitrate Induced Polyuric Acute Tubular Necrosis in Rats

We investigated the pathobiological course of uranyl nitrate (UN) induced polyuric acute tubular necrosis (ATN) in male Sprague Dawley rats. UN (5mg/kg 15mg/kg and 3Omg/kg) in 5% NaHCO3 induced weight loss, polydipsia, and polyuria 24 hrs after injection when compared to the controls which were treated with 5% NaHCO3 only. Twenty four hours following the injection of UN, serum creatinine and blood urea nitrogen levels had increased. These changes continued for at least 72 hours, although the concentration of uranium had decreased. Light microscopic studies conducted 24 hours after injection, revealed partial degeneration and necrosis of the proximal tubules and many casts m the distal convoluted tubules. These changes progressed for 72 hours. Despite this tubular damage, the glomeruli were relatively intact. 5 days after injection, the epithelial cells lining the proximal tubules displayed regenerative activities; these findings were more prominent after 10 days. Through electron microscopic examination, we observed the destruction of mitochondria in the proximal tubular cells, a possible cause of polyuria. Ten days post injection regenerative activities in the proximal tubular cells showed that the maturation of intracellular organelles followed the proliferation of the premature cells.