imaizumi kazuyoshi

Background: T-helper (Th)-2 background in the lungs may flavor the development of pulmonary fibrosis. We hypothesized that usual interstitial pneumonia (UIP) and nonspecific interstitial pneumonia (NSIP), major pathologic patterns of chronic interstitial pneumonia, Would have different expression profiles of T(H)1 and T(H)2 chemokines. Methods: Total RNA was isolated from lung tissues obtained by surgical biopsy (18 cases of UIP and 29 cases of NSIP). The expression of ligands for CXCR3 [T-H] cells chemoattractant: monokine induced by interferon (IFN)-gamma (MIG), IFN-gamma-inducible protein of 10 kD, and IFN-inducible T cell alpha chemoattractant] and ligands for CCR4 [T(H)2 cells chemoattractant: thymus- and activation-regulated chemokine and macrophage-derived chemokine (MDC)] were analyzed by real-time reverse transcriptase polymerase chain reaction. Results: MIG and IFN gamma-inducible protein of 10 kD expression were significantly higher in NSIP compared with UIP. MDC expression was increased in UIP compared with NSIP, although the difference was not significant. MIG/MDC is significantly elevated in NSIP but not UIP. Interestingly, MIG/MDC was significantly higher in NSIP group 3 (NSIP with extensive fibrosis) compared with UIP. Conclusions: These results may indicate that these 2 diseases have a different pathophysiology. MIG/MDC may be a Useful marker to distinguish these 2 diseases.

Exposure of healthcare workers to patients with rapidly fatal infections invariably raises concerns regarding the risk of occupational acquisition. We describe acquisition of Streptococcus pyogenes by 2 nurses from a patient with fatal pneumonia and review previously reported cases of transmission of bacterial pathogens from patients with pneumonia to healthcare workers.

Takagi Y, Hashimoto N, Phan SH, Imaizumi K, Matsuo M, Nakashima H, Hashimoto I, Hayashi Y, Kawabe T, Shimokata K, Hasegawa Y. Erythromycin-induced CXCR4 expression on microvascular endothelial cells. Am J Physiol Lung Cell Mol Physiol 297: L420-L431, 2009. First published June 5, 2009; doi: 10.1152/ajplung.90477.2008.-Although stromal-derived factor-1 (SDF-1) via its cognate receptor CXCR4 is assumed to play a critical role in migration of endothelial cells during new vessel formation after tissue injury, CXCR4 expression on endothelial cells is strictly regulated. Erythromycin (EM), a 14-membered ring macrolide, has an anti-inflammatory effect that may account for its clinical benefit in the treatment of chronic inflammatory diseases. However, the effects of EM on endothelial cells and especially their expression of CXCR4 have not been fully evaluated. In this study, we demonstrated that EM markedly induced CXCR4 surface expression on microvascular endothelial cells in vitro and lung capillary endothelial cells in vivo. This ability to induce CXCR4 surface expression on endothelial cells was restricted to 14-membered ring macrolides and was not observed in other antibiotics including a 16-membered ring macrolide, josamycin. Furthermore, this EM-induced expression of CXCR4 on endothelial cells was functionally significant as demonstrated by chemotaxis assays in vitro. These findings suggest that EM-induced CXCR4 surface expression on endothelial cells may promote migration of CXCR4-expressing endothelial cells into sites of tissue injury, which may be associated with the known antiinflammatory activity of this macrolide.

Although Pneumocystis infection might be one of the causes of secondary pulmonary alveolar proteinosis (PAP), the mechanism of its pathogenesis is uncertain. We analyzed a mouse model of secondary PAP resulting from Pneumocystis infection using mice deficient in CD40 (CD40KO), and evaluated the mechanism of the pathogenesis of secondary PAP from the viewpoint of surfactant-associated protein (SP) homeostasis, the overproduction of SP by type II alveolar epithelial cells, and the phagocytic function of alveolar macrophages (AMs). The effect of CD40 on SP production was also investigated in vitro using the H441 cell line, which has a phenotype similar to type II alveolar epithelial cells and primary alveolar epithelial cells. After long-term exposure to ovalbumin, CD40KO mice showed Pneumocystis infection and accumulation of surfactants in the alveoli (ApCD40KO). The amounts of SP production were up-regulated in ApCD40KO mice compared with wildtype mice treated using the same procedure. On the other hand, AMs from ApCD40KO mice did not show either phagocytic dysfunction or down-regulation of PU.1 expression. Furthermore, the stimulation of CD40-CD40 ligand (CD154) pathway regulated the production of SPs in H441 cells or primary alveolar epithelial cells. These results suggested that CD40KO mice could be one of the models useful for developing secondary PAP resulting from Pneumocystis infection. Surfactant accumulation was due to the overproduction in our model of secondary PAP. The CD40-CD154 interaction plays an important role in the regulation of surfactant-associated protein production.

Background: Cyclooxygenase (COX-2) overexpression is seen in many malignancies including lung cancer. Recent pre-clinical studies have shown that selective COX-2 inhibitors have demonstrated promising results when used with chemotherapy. Based on these observations, we assessed the efficacy and tolerability of the combination chemotherapy consisting of carboplatin and paclitaxel with meloxicam, a selective COX-2 inhibitor. Methods: Forty-four patients with stage IIIB or IV non-small cell lung cancer (NSCLC), Eastern Cooperative Oncology Group performance status (PS) 0 or 1, who had adequate organ function, were eligible. Patients received paclitaxel 70 mg/m(2) weekly for 3 of 4 weeks with carbopltin (AUC 6) on day 1, as well as daily meloxicam (10 mg/day). The response rate was the primary endpoint. Secondary endpoints were overall survival, toxicity profile and quality of life (using European Organization for Research and Treatment of Cancer (EORTC) QLC-C30 and LC73). Results: From March 2005 to September 2006, 44 patients were evaluated in this study. Gender M/F, 31/13; median age, 64 years (range. 34-75); stage IIIB/IV, 11/33; PS0/1, 22/22; histology Ad/Sq/Other, 29/6/9. Partial response was observed in 19 patients (43%) with stable disease, and there was no complete response, for an overall response rate of 43% (95% confidence interval, 28.5-57.8%). Ten patients (23%) had grade (G) 3 and three (7%) had G4 neutropenia. Three patients (7%) had G3 thrombocytopenia. As for non-hematological toxicities, one case of G4 toxicity (perforation of jejunum) was observed, but other toxicities were mild (one muscle pain, two liver dysfunction, one fatigue and one nausea G3). Grade 2 peripheral neuropathy was observed in only one patient. Using the EORTC QLQquestionnaire, the global health status did not change significantly during this therapy (before and 4 and 8 weeks later). Median follow-up was 13.6 months (range, 1.8-31.3 months). By the time of the final analysis (October 2007), 26 of the initial 44 patients had died. The 1-year survival rate was 64% and median survival time was 15.9 months. Conclusions: Meloxicam in combination with carboplatin and weekly paclitaxel chemotherapy showed promising activity with encouraging survival. This therapy is relatively well tolerated in advanced NSCLC. (c) 2008 Elsevier Ireland Ltd. All rights reserved.

We report a case of idiopathic pulmonary veno-occlusive disease (PVOD). The patient experienced progressively worsening dyspnea. Heart catheterization revealed severe pulmonary hypertension. High-resolution computed tomography (HRCT) showed diffuse, poorly identified centrilobular ground-glass opacities. Surgical lung biopsy led to the diagnosis of PVOD. A microscopic examination revealed occlusions of pulmonary veins and venules over a wide area with prominent loop-like capillary dilatations. These pathological findings may be correlated with the radiological characteristics of HRCT in this case.

(一般演題(口演)9 癌性胸膜炎・心膜炎,第48回日本肺癌学会総会号)

(第90回 日本肺癌学会中部支部会,支部活動)