Porcine low-density lipoprotein receptor plays an important role in classical swine fever virus infection

Several cellular factors have been reported to be required for replication of classical swine fever virus (CSFV), a member of the genus Pestivirus within the family Flaviviridae. However, many steps of its replication cycle are still poorly understood. The low-density lipoprotein receptor (LDLR) is involved in cell entry and post-entry processes of different viruses including other members of the Flaviviridae. In this study, the relevance of LDLR in replication of CSFV and another porcine pestivirus, Bungowannah pestivirus (BuPV), was investigated by antibody-mediated blocking of LDLR and genetically engineered porcine cell lines providing altered LDLR expression levels. An LDLR-specific antibody largely blocked infection with CSFV, but had only a minor impact on BuPV. Infections of the genetically modified cells confirmed an LDLR-dependent replication of CSFV. Compared to wild type cells, lower and higher expression of LDLR resulted in a 3.5-fold decrease or increase in viral titers already 20 h post infection. Viral titers were 25-fold increased in LDLR-overexpressing cells compared to cells with reduced LDLR expression at 72 h post infection. The varying LDLR expression levels had no clear effect on permissivity to BuPV. A decoy receptor assay using recombinant soluble LDLR provided no evidence that LDLR may function as a receptor for CSFV or BuPV. Differences in their dependency on LDLR suggest that CSFV and BuPV likely use different mechanisms to interact with their host cells. Moreover, this study reveals similarities in the replication cycles of CSFV and other members of the family Flaviviridae that are dependent on LDLR.

[Rituximab therapy for relapsing IgG4-autoimmune pancreatitis and cholangitis - a case report]

We report a patient with autoimmune pancreatitis and cholangitis. During a period of 3 years and despite therapy with steroids and immunmodulatory drugs such as azathioprine and mycophenolate mofetil he suffered from multiple relapse episodes including bile duct stenoses requiring endoscopic interventions. After initiation of therapy with the monoclonal CD20 antibody Rituximab, steroids could be stopped completely and the patient remains in remission. Rituximab should be considered in therapy of relapsing autoimmune pancreatitis and cholangitis.

Clinical value of sentinel node mapping in carcinoma of the colon

AIM

Sentinel lymph node mapping has been used in colon cancer to improve prognosis. This study aimed to determine the accuracy of in vivo SLNM in patients with colon carcinoma undergoing surgery with curative intent.

METHOD

Thirty-one patients operated for colon carcinoma underwent in vivo sentinel lymph node mapping using patent blue dye. Each sentinel lymph node (SLN) was marked intraoperatively, and histological examination was performed after en bloc resection. If no metastasis was found, step sectioning with immunohistochemistry was performed.

RESULTS

The SLN was successfully identified in 28 (90%) of 31 patients. The false-negative rate to identify stage III disease was 66% (eight of 12), the negative predictive value was 46% (19 of 27) and the accuracy was 14% (four of 28). One patient negative on routine histopathology had micrometastasis on step sectioning of the SLN.

CONCLUSION

Sentinel lymph node mapping in colon carcinoma cannot accurately predict nodal status.

Ultrasound-guided thoracic paravertebral puncture and placement of catheters in human cadavers: where do catheters go?

BACKGROUND

Paravertebral regional anaesthesia is used to treat pain after several surgical procedures. This study aimed to improve on our first published ultrasound-guided approach to the paravertebral space (PVS) and to investigate a possible discrepancy between the needle, catheter, and contrast dye position.

METHODS

In 10 cadavers, we conducted 26 ultrasound-guided paravertebral approaches combined with loss of resistance (LOR) and after an interim analysis performed 36 novel, pure ultrasound-guided (PUSG) paravertebral approaches. Needle-tip position was controlled by a first computed tomography (CT) scan. After placement of the catheters, the tips were assessed by a second CT and the spread of injected contrast dye was assessed by further CT scans. The part of the PVS near the intervertebral foramen was defined as the primary target to reach.

RESULTS

The first CT scans assessing 62 needle tips revealed that: 13 (50%) of LOR and 34 (94%) of PUSG approaches were at the target; and two (8%) LOR and no PUSG approaches were outside the PVS. With the second CT scans 60 catheter-tip positions were analysed: three (12%) of LOR and five (14%) of PUSG approaches were at the target, three (12%) of LOR and two (6%) of PUSG approaches were outside the PVS. No catheters were detected in the epidural space. In two cases, insertion of the catheter was not possible. In cases with major epidural contrast, the widest contrast dye spread was 7.7 (3.5) [mean (sd)] vertebral segments.

CONCLUSIONS

Our new PUSG technique has a high success rate for paravertebral needle placement. Although needles were correctly positioned, catheters were usually found distant from the needle-tip position.

Hydrodissection for subperichondrial septoplasty - an experimental anatomical study

OBJECTIVES

The effect of hydrostatic infiltrations for subperichondrial dissection is controversial. Classical textbooks promote it as the "key step in elevating the flaps" or consider its practicability "a mere fable". Moreover, case reports describe fatal side effects. Up to now, experimental tests are missing.

DESIGN

Experimental study.

MATERIALS AND METHODS

Three surgeons simulated subperichondrial hydrodissection with 20 mineral salt fixed human cadaver heads. One ml lidocaine 5% with 1:105 adrenaline and India ink was infiltrated. Each septum was examined histologically using serial 3 microm sections in 150 microm intervals. Tissue cleavage containing the ink deposits with minimal distance to the proposed subperichondrial zone, intravasal spread and tissue deposition were analyzed.

RESULTS

Every injection produced a physical dissection (n = 20). However, dissected planes were localized mostly in the supra-perichondrial connective tissue (n = 8) or within the perichondrium (n = 4). Only five cases showed the propagated correct dissection in a subperichondrial zone. Three anomalous septa were excluded from quantitative analysis. Infiltrated matter did not only accumulate within the dissection plane but also penetrated the surrounding vessels of the septal intumescentia (n = 8).

CONCLUSION

Hydrostatic infiltrations represent an unreliable surgical technique for dissection of an anatomical correct subperichondrial plane but can be useful for anesthesia and hemostasis, however, using high pressure and high volume infiltrations might foster serious side effects.

Relationship between therapeutic time intervals and intermediate term left ventricular systolic function in patients treated with facilitated percutaneous coronary intervention for acute myocardial infarction

BACKGROUND

The concept of initiating fibrinolytic therapy in patients who cannot undergo immediate percutaneous coronary intervention (PCI) in the setting of acute ST-segment-elevation myocardial infarction (STEMI) has been proposed as a strategy to improve outcomes. However, evidence supporting the use of this strategy is not conclusive, and the results of recent randomized controlled trials are apparently contradictory. Probably, the time points of administration of the adjunctive thrombolytics and antiplatelet agents and the time loss until coronary intervention have a major influence on the discrepancy of outcomes in different trials. Therefore, the relationship between therapeutic time intervals and outcome in patients treated with facilitated PCI has been analyzed.

METHODS

In this single center retrospective study, 131 patients with STEMI were treated with a combined pharmaco-mechanical reperfusion strategy using half-dose r-tPA combined with a glycoprotein (GP) IIb/IIIa antagonist prior to PCI. Specific time points were recorded for each patient, including the time of symptom onset, the time of first medical contact, the start of intravenous thrombolysis, the time of administration of the GP IIb/IIIa antagonist and the start of coronary intervention. We then examined the relationship between the time delay from symptom onset to the initiation of various steps of treatment and the residual myocardial damage as expressed by the severity of both global and regional myocardial dysfunction calculated from a left ventriculography study performed 3 months later.

RESULTS

The median time from symptom onset to the first medical contact, with 25th and 75th percentiles in parentheses, was 1.25 h (0.75, 3), from symptom onset to initiation of thrombolytic therapy 2.25 h (1.25, 3), to initiation of GP IIb/ IIIa inhibitor therapy 3.5 h (2, 5.69), and to the start of coronary intervention 4.81 h (2.85, 7.91). The time between symptom onset and initiation of both thrombolytic therapy and coronary intervention was significantly related to the global ejection fraction and to the extent of regional hypokinesia at the 3-month follow-up (p<0.05). The time to the initiation of GP IIb/IIIa inhibitors was only significantly related to the global ejection fraction (p<0.05), while the time to the first medical contact did not show a similar relationship (p>0.05). Furthermore, we observed a significant relationship between the infarct-related artery (IRA) patency at the initial angiogram and the residual regional myocardial damage at follow-up; normokinesia at follow-up was found in 61.3% of patients with an initially patent IRA and in 41.2% of patients with an initially occluded IRA, whereas severe hypokinesia was found in 13.8% and 37.3%, respectively (p<0.05).

CONCLUSION

In patients with STEMI treated with a facilitated PCI strategy using half dose r-tPA in combination with a glycoprotein IIb/IIIa receptor blocker, the 3-month global and regional residual myocardial dysfunction is significantly related to the time elapsed between the onset of symptoms and the start of both fibrinolytic therapy and coronary intervention.

Acetic acid-guided biopsies after magnifying endoscopy compared with random biopsies in the detection of Barrett's esophagus: a prospective randomized trial with crossover design

BACKGROUND

In contrast to standard video endoscopy, magnifying endoscopy after local acetic acid application enables recognition of mucosal surface architecture.

OBJECTIVE

To investigate the diagnostic yield of magnifying endoscopy with acetic acid-targeted biopsies compared to random, 4-quadrant biopsies.

DESIGN

Prospective randomized trial (ratio 1:1) with crossover design.

SETTING

Two referral hospitals in Germany.

PATIENTS

Thirty-one patients with Barrett's esophagus or visible columnar-lined lower esophagus.

INTERVENTIONS

Patients were randomized to undergo either standard video endoscopy with 4-quadrant biopsies or magnifying endoscopy in conjunction with acetic acid application. All patients were re-examined 14 days after the initial endoscopy with the corresponding procedure.

MAIN OUTCOME MEASUREMENTS

Primary outcome analysis (per protocol and per biopsy) was the histological proof of Barrett's epithelium. Secondary outcome analysis was the correlation between the surface architecture and the presence of Barrett's epithelium and the needed number of biopsies to confirm Barrett's epithelium for the 2 different procedures.

RESULTS

Magnifying endoscopy enabled the prediction of Barrett's epithelium with a sensitivity of 100% and a specificity of 66%, respectively (accuracy 83.8%). Acetic acid-guided biopsies obtained a significantly higher percentage of tissues containing SCE (78%; 188/241) compared to random biopsies (57%; 159/280).

LIMITATIONS

No data on the diagnosis of Barrett's dysplasia.

CONCLUSION

Magnifying endoscopy with acetic acid-guided biopsies is superior to standard video endoscopy with random biopsies, and the number of biopsies needed to confirm Barrett's epithelium is half as much when compared to random biopsies.

Effect of an exercise training program on endothelial dysfunction in diabetic and non-diabetic patients with severe chronic heart failure

BACKGROUND

Endothelial dysfunction is found both in patients with chronic heart failure and in patients with insulin-treated type 2 diabetes mellitus. This endothelial dysfunction leads to a significant reduction in endothelium-derived vasodilation. Physical exercise can have a positive effect on endothelial dysfunction in patients with coronary artery disease, chronic heart failure and diabetes mellitus. It is not clear, however, whether an exercise program influences endothelial function in diabetics with chronic heart failure. Our study was thus aimed at investigating whether a special exercise program would affect endothelial function. Comparisons were made with insulin-treated type 2 diabetics and with non-diabetics suffering from chronic heart failure.

METHODS

42 patients with severe chronic heart failure (LVEF < or = 30%), insulin-dependent diabetics (n=20, mean age 67+/-6 yrs, 16 male, 4 female), non-diabetics (n=22, mean age 68+/-10 yrs, 20 male, 2 female) participated in a 4-week exercise program consisting of ergometer and special muscle strength training. Before (T1) and at the end (T2) of the training program endothelium-dependent and endothelium-independent vasodilatory capacity were assessed by brachial artery diameter measurement.

RESULTS

At the end of the training program, there were no significant results within the two groups. The endothelium-dependent vasodilation changed between T1 and T2 as follows: In the diabetic group, the endothelium-dependent vasodilation at T1 and T2 was 5.1+/-3.6 and 4.9+/-2.5%, respectively. For the non-diabetics, the endothelium-dependent vasodilation was 6.8+/-4.5 and 7.6+/-4.0% at T1 and T2, respectively. The endothelium-independent vasodilation in the diabetics was 10.5+/-5.6 at T1 and dropped to 8.7+/-4.1% at T2. The results for the non-diabetics were 13.2+/-5.8 and 12.3+/-6.3% at T1 and T2, respectively. The LVEF in the diabetics was 24.2+/-3.4% at T1, increasing to 27.8+/-5.8% at T2. In the non-diabetics, the LVEF was 22.9+/-3.8 at T1 vs. 28.6+/-6.9% at T2. In the groups of diabetics, the maximum oxygen uptake (VO2-max) was 10.3+/-3.9 at T1 vs. 11.4+/-2.8 ml/kg/min at T2 and in the group of non-diabetics 10.0+/-3.1 vs. 13.5+/-5.0 ml/kg/min. No correlations were found between the change in endothelium-dependent vasodilation and the increase in oxygen uptake.

CONCLUSION

In our study, a program of physical exercise had no influence on endothelium-dependent or endothelium-independent vasodilation in insulin-treated type 2 diabetics or in non-diabetics with considerably reduced ejection fraction. In both groups, however, an exercise-related influence on medical parameters and physical performance could be observed.

[Acute coronary syndrome after diclofenac induced coronary spasm]

We report about a 67-year old man, who was submitted to our clinic with acute coronary syndrome. The cardiac catheterization showed a proximal thrombus in the left anterior descending (LAD). The other coronary arteries did not have significant lesions. After percutaneous transluminal coronary angioplasty with stent-implantation into the proximal LAD the patient remained clinically stable. Cardiac enzymes confirmed no myocardial necrosis. Three days after the acute coronary syndrome the patient developed a podagra, which was treated with colchicinum, diclofenac and local cooling. Five hours after initial therapy the patient developed severe symptoms of angina pectoris and electrocardiographical signs of an acute posterior and anterior myocardial infarction. Immediate coronary angiography demonstrated extended vasospasm of the right coronary artery. Intracoronary application of verapamil and nitroglycerin resolved the coronary spasm. The patient reported about a self-indicated application of diclofenac six hours before hospital admission. This case demonstrates that oral application of diclofenac can provoke coronary vasospasm.

Biliary infarction mimicking liver metastasis

A 38-year-old man with a history of chronic alcohol abuse had suffered from numerous acute episodes of chronic pancreatitis in the last 7 years. Those episodes were complicated by the formation of a pseudocyst in the pancreatic head. He presented himself with vomiting and abdominal pain as well as diarrhoea for 10 days. In the ultrasound examination of the liver numerous circumscribed hypoechoic formations in both lobes of the liver were found. A subsequent computerised tomography scan confirmed multiple hypodense liver lesions. Because of suspected metastasis or abscesses in the liver, sonographically guided fine needle biopsies of these liver structures were carried out. The histological examination of the liver specimens showed bile infarcts and proliferated bile ducts; there were no signs of a malignant or infectious process. The bacteriological cultures of the biopsy specimens were negative.

Effects of education, self-care instruction and physical exercise on patients with chronic heart failure

BACKGROUND

Evidence is now evolving of the importance of team management for patients with chronic heart failure. This includes education, patient self-care and physical exercise training. How such programs should be implemented is still under discussion.

AIM

To assess the efficacy of an in-hospital rehabilitation clinic-based program, we studied its influence on cardiopulmonary parameters and quality of life in an outpatient setting.

METHODS AND RESULTS

75 patients (62 male, 13 female, mean age 65+/-8 years) underwent an exercise program including education, bicycle ergometer, muscle strength training and the 6-min walk test as a training unit for 4 weeks. Patients were studied at baseline (T1), before discharge (T2) and after a follow-up period of 29.9+/-5.5 weeks (T3). Baseline data (T1): left ventricular ejection fraction (LVEF): 33.8+/-7.6%, left ventricular end-diastolic volume (LVEDV): 130+/-51 ml, peak VO(2): 12.3+/-4.3 ml/kg, maximum work load (Watt max): 71+/-27 W. At discharge (T2) and follow-up (T3) LVEF increased to 36.8+/-8% and 41.8+/-9.2%, LVEDV decreased to 127+/-43 ml and 114+/-40 ml, peak VO(2) increased to 14.1+/-5.1 ml/kg and 15.2+/-5 ml/kg, and Watt max increased to 84+/-28 Wand 98+/-42 W (all p<0.01). Quality of life improved significantly at discharge and follow-up in nearly all domains and in the summary score for physical health. There were no significant changes for anxiety and depression at T2 and T3.

CONCLUSION

A specialized in hospital rehabilitation program including education, patient self management and training has a sustained positive effect on cardiopulmonary parameters and physical well-being.

[Bland-White-Garland syndrome in an adult]

We report about a 47-year-old woman, who presented with a history of cardiac failure. Echocardiography showed an impaired left ventricular function, clinically significant mitral regurgitation and pulmonary hypertension. Diagnosis of a Bland- White-Garland syndrome was made by coronary angiography. Subsequent therapy consisted of ligation of the anomalus origin of the left coronary artery, implantation of a Mammaria interna graft to the left coronary artery and replacement of the mitral valve by a mechanical prosthesis. One year after operation, left ventricular function was still impaired. At a 3-year follow-up, left ventricular function improved continuously.

A rapid microbiopsy system to improve the preservation of biological samples prior to high-pressure freezing

A microbiopsy system for fast excision and transfer of biological specimens from donor to high-pressure freezer was developed. With a modified, commercially available, Promag 1.2 biopsy gun, tissue samples can be excised with a size small enough (0.6 mm x 1.2 mm x 0.3 mm) to be easily transferred into a newly designed specimen platelet. A self-made transfer unit allows fast transfer of the specimen from the needle into the specimen platelet. The platelet is then fixed in a commercially available specimen holder of a high-pressure freezing machine (EM PACT, Leica Microsystems, Vienna, Austria) and frozen therein. The time required by a well-instructed (but not experienced) person to execute all steps is in the range of half a minute. This period is considered short enough to maintain the excised tissue pieces close to their native state. We show that a range of animal tissues (liver, brain, kidney and muscle) are well preserved. To prove the quality of freezing achieved with the system, we show vitrified ivy leaves high-pressure frozen in the new specimen platelet.

[Endoscopic Therapy of Early Colorectal Cancer (pT1) - A Prospective Study]

INTRODUCTION

In a prospective study initiated in 1982, we have been investigating the question as to whether - and if so, which - pT1 carcinomas of the colorectum can be treated exclusively via the endoscope.

METHOD

In the period between February 1, 1982 and April 30, 2001, a total of 5,470 polyps were removed endoscopically at the Medical Department I of the Klinikum Ludwigsburg. Among these lesions, a total of 144 (2.6 %) pT1 carcinomas were found in 141 patients. We were able to follow 120 patients with 123 pT1 carcinomas over a mean follow-up period of 46 months (range: 1-60). In low-risk situations (definitive removal in healthy tissue, G1-G2, no lymphatic involvement), endoscopic treatment alone usually represented sufficient treatment. In high-risk cases (removal in healthy tissue uncertain or negative, and/or lymphatic vessel involvement, and/or G3/G4), subsequent surgical resection was carried out.

RESULTS

64 cases were classified as high-risk, 59 as low-risk. Nevertheless, 9 patients with 10 low-risk carcinomas were submitted to surgery (young age, patient's own request). In none of these 10 cases was residual tumour or lymph node metastasis detected in the surgical specimen. 47 patients with 49 low-risk carcinomas were treated solely by endoscopic polypectomy using the diathermy snare, and 45 patients with 47 carcinomas remained recurrence-free during the follow-up period. In a single case, a local recurrence was detected 2 months after polypectomy and underwent curative resection. In another case, peritoneal carcinosis with tumour infiltrating into the colon developed 8 months after initial treatment; this, however, was most probably a recurrence of a previously operated carcinoma of the uterus. Among the high-risk cases, 10 were not submitted to surgery on account of advanced age and/or rejection of an operation by the patient; all remained recurrence-free. Among the surgically treated high-risk carcinomas, 3 surgical specimens contained residual tumour, while 2 revealed a lymph node metastasis. In our group of patients, no tumour-related mortality was seen among endoscopically treated patients.

DISCUSSION

In the light of the fact that the reported mortality rate associated with open surgery for colorectal carcinoma is 3 % as compared with about 1 % risk of lymph node metastasis and 0,1 % mortality rate for the endoscopic modality, endoscopic removal of a pT1 tumour in a low-risk situation followed by appropriate surveillance can be considered as adequate treatment.

Chlamydia pneumoniae infection and restenosis in patients with coronary heart disease

BACKGROUND

The aim of this study was to establish whether Chlamydia pneumoniae is implicated in the development of restenosis in patients with coronary heart disease (CHD) after percutaneous transluminal coronary angioplasty (PTCA).

PATIENTS AND METHODS

67 patients were selected for study after they underwent control angiography after PTCA. Sera were tested for anti-chlamydial antibodies with a genus specific ELISA and a species-specific microimmunofluorescence test (MIFT). Oropharyngeal specimens were examined for the presence of antigen with a Chlamydia immunofluorescence test (IFT), C. pneumoniae IFT and semi-nested PCR. In addition, anamnestic findings were also included. To determine the general level of antibodies, an age- and sex matched control group of 180 persons was also examined for Chlamydia and C. pneumoniae serology.

RESULTS

Coronary angiography revealed that 31 of the 67 patients had developed a restenosis. There was no significant correlation between serological and angiographic findings. However, the MIFT showed a higher positive rate, especially in IgA, in the restenosis group. C. pneumoniae was detected in the oropharynx by PCR and/or IFT in 20.8% and 16.0% of the cases in patients with and without a restenosis. PCR found more C. pneumoniae-positive cases in the restenosis patients than IFT. No association was found between the detection of Chlamydia antigen and serology. The women with restenosis were more frequently smokers (p = 0.012). Men with restenosis were significantly older (p = 0.015). C. pneumoniae serology based on the rELISA or the MIFT did not show any correlation with restenosis.

CONCLUSION

No evidence was found to suggest that positive C. pneumoniae serology is a risk factor for the development of restenosis. However, whether the species-specific serological test, especially for IgA-antibodies, and the detection of C. pneumoniae in oropharyngeal specimens by PCR might be reliable diagnostic markers in these cases remains to be determined.

[A severe traffic accident--250 years ago. Medical history presentation]

During a scientific examination in July 1999 both crypts below the St. Martin's Church in Grünstadt, Germany, were opened and 9 coffins from the county family of Leiningen examined. This paper is concentrating on one of these persons: Georg Hermann (1679-1751), count of Leiningen-Westerburg-Altleiningen, who gave during the 18. century the city its barock character. He was also responsible for the rebuilding of the church. His skeleton revealed interesting pathological changes. Few years before his death the count had the accident to get run over by a heavy wagon which crushed the distal part of his legs. The fractures healed, but gave him an ancylotic and shortened left leg, which must have caused him a lot of suffering in his last years.

Prognostic relevance of Ki-67 antigen expression in 329 cases of oral squamous cell carcinoma

Prognostic relevance of Ki-67 staining in oral squamous cell carcinomas was investigated by immunohistochemical expression in 329 cases of squamous cell carcinoma of the oral cavity due to a formamide pretreatment. The growth fraction (Ki-67 labelling index, LI) was correlated to histopathological grading, lymphocytic reaction, stroma/tumour proportion, pattern of invasion, mitotic rate, degree of keratinisation, tumour size, thickness of tumor, depth of invasion, lymph node involvement and five-year survival rate. Highly significant inverse correlation was found between the Ki-67 LI, the stroma/tumour proportion and the degree of keratinisation whereas no correlation could be established between the Ki-67 LI and all the other histological and clinical paramters. Ki-67 staining alone has no prognostic relevance in oral cancer.

[Pullback atherectomy. An alternative procedure in the treatment of coronary stenosis and in-stent restenosis]

Optimized directional coronary atherectomy (DCA) has shown significantly superior acute and long-term results compared to conventional balloon angioplasty (BA). Nevertheless DCA has remained a niche application due to specific procedural aspects. The pullback atherectomy catheter (PAC), developed to retrieve atheromatous plaque material, is an alternative debulking device. We report on clinical and angiographic experience in 55 consecutive patients, in whom de novo lesions (35 pts) as well as instent restenoses (17 pts) were treated. The minimal luminal diameter (MLD, mm) rose after PAC and additional BA from 1.06 +/- 0.53 to 2.68 +/- 0.48 and from 1.10 +/- 0.48 to 2.55 +/- 0.49 mm, respectively. A stenosis reduction from 69 +/- 13 to 19 +/- 16 and from 64 +/- 15 to 16 +/- 10%, resp., could be documented. After 3-6 months a complete angiographic follow-up showed MLD values of 2.01 +/- 0.69 and 1.88 +/- 0.61 mm. Nine of 35 (26%) vs. 5 of 17 (29%) pts developed significant restenosis at the treated site (diameter stenoses > 50%). Stent implantation was necessary to achieve an optimal acute angiographic result or due to dissection in 17 vs. 5 pts. Major cardiac events did not occur; however, two restenosed coilstents were removed by PAC. With the pullback atherectomy catheter, a safe and effective alternative device is available for the treatment of coronary lesions and also of in-stent restenosis. Promising short and acceptable long-term results are comparable to those of other debulking procedures.

Differences in tumor cell proliferation, HLA DR expression and lymphocytic infiltration in various types of thyroid carcinoma

The proliferative activity of various thyroid carcinoma forms (papillary, follicular, medullary, anaplastic) was investigated using two second generation antibodies against Ki-67 that can be used on paraffin-embedded sections. Poorly-differentiated carcinomas had a higher proliferation than well-differentiated forms. Papillary carcinoma stained significantly more often with either antibody than follicular carcinoma. A solid growth pattern correlated with high Ki-67 expression while an increase in follicular elements and a high amount of psammoma bodies coincided with lower proliferation.HLA class II expression and infiltrating lymphocytes are prerequisites for an immune defense against cancer. In this study, HLA DR was increased in poorly-differentiated carcinomas, especially in the anaplastic type. The increase in HLA DR was correlated with Ki-67 positivity. On tumor-infiltrating lymphocytes, HLA DR was well expressed in papillary carcinoma and relatively poorly expressed in follicular carcinoma, but there was no significant correlation with carcinoma type or morphological parameters. CD 45 R0, which might recognize memory cells, was found mostly in anaplastic and papillary carcinomas, and correlated well with HLA DR expression. These findings imply that an active but variable immune response is present in thyroid carcinoma.

NEJ1 controls non-homologous end joining in Saccharomyces cerevisiae

Broken DNA ends are rejoined by non-homologous end-joining (NHEJ) pathways requiring the Ku proteins (Ku70, Ku80), DNA ligase IV and its associated protein Lif1/Xrcc4 (ref. 1). In mammalian meiotic cells, Ku protein levels are much lower than in somatic cells, apparently reducing the capacity of meiotic cells to carry out NHEJ and thereby promoting homologous recombination. In Saccharomyces cerevisiae, NHEJ is also downregulated in meiosis-competent MATa/MAT alpha diploid cells in comparison with diploids or haploids expressing only MATa or MAT alpha. Diploids expressing both MATa and MAT alpha show enhanced mitotic homologous recombination. Here we report that mating-type-dependent regulation of NHEJ in budding yeast is caused in part by transcriptional repression of both LIF1 and the gene NEJ1 (YLR265C)--identified from microarray screening of messenger RNAs. Deleting NEJ1 reduces NHEJ 100-fold in MATa or MAT alpha haploids. Constitutive expression of NEJ1, but not expression of LIF1, restores NHEJ in MATa/MAT alpha cells. Nej1 regulates the subcellular distribution of Lif1. A green fluorescent protein (GFP)-Lif1 fusion protein accumulates in the nucleus in cells expressing NEJ1 but is largely cytoplasmic when NEJ1 is repressed.

Persistent adenoviral infection and chronic obstructive bronchitis in children: is there a link?

Chronic obstructive bronchitis with inadequate response to inhaled steroid and bronchodilator therapy is a rather rare disorder in children. Persistence of an adenoviral infection has been described as a possible cause of unremitting airway obstruction. We studied a group of 11 children with the clinical feature of chronic bronchial obstruction. A high-resolution computed tomography (HR-CT) scan was performed and typically showed hyperinflation and ground-glass-like opacities. All children underwent either bronchoscopic transbronchial or open lung biopsy. Biopsy specimens were stained with monoclonal antibodies detecting adenoviral antigen and analyzed by light-microscopy. Bronchoalveolar lavage (BAL) fluid was cultured for adenovirus, and antigen detection tests were performed. While some children had a history of proven adenoviral infection at the onset of their disease, in none of the cases could a persistence of adenovirus be shown. We conclude that adenoviral infection might act as a starter of chronic obstructive bronchitis in children, but that pathogenetic mechanisms other than persistent infection must be responsible for the chronicity of the disease.