Pseudomonas aeruginosa and a proteomic approach to bacterial pathogenesis.

Pseudomonas aeruginosa is a Gram-negative bacterium that is ubiquitous in the environment and can cause a variety of diseases in compromised patients. The genome of P. aeruginosa strain PAO1 has been reported to contain 5570 potential proteins. The value of this genomic database is that new proteins can be recognized to use as diagnostic markers, novel drug targets, and to better understand the physiology of this organism. However, similar to what has been observed in other sequenced bacterial genomes, approximately one third of the potential proteins have no known function. This is somewhat surprising given the long-standing interest in P. aeruginosa as an opportunistic pathogen. Obviously new tools, in addition to sequence similarity analysis, are needed to determine the role of these proteins. Proteomics using two-dimensional gel electrophoresis followed by mass spectrometry to detect and identify P. aeruginosa proteins represents a novel approach to address this gap.

Angiotensin-converting enzyme gene I/D polymorphism in malignant hypertension.

BACKGROUND: The mechanism of the rapid transition of a stable benign hypertensive disease to a severe and devastating malignant hypertension is not fully understood. However, the renin angiotensin system, which is highly activated in malignant hypertension, is established as an important pathogenetic factor in different cardiovascular and renal diseases. Over the last decade, a polymorphism in genes regulating this system has been found. This includes the 287 bp sequence deletion (D)/insertion (I) polymorphism in the angiotensin-converting enzyme (ACE) gene and the methionine (M) to threonine (T) point mutation polymorphism in the angiotensinogen (AGT) gene. These gene polymorphisms have been associated with various cardiovascular and renal diseases and the aim of this study was to investigate whether they were linked to malignant hypertension. METHODS: Forty-two patients with malignant hypertension (mean age 55 years), 42 patients with non-malignant hypertension (mean age 57 years) and 85 normotensive control subjects (mean age 42 years) were investigated with respect to ACE I/D and AGT M/T genotypes. DNA was prepared by standard methods from isolated white blood cells and analysed by the PCR technique. The PCR reaction used in the detection of the ACE I/D polymorphism was optimized for an equal amplification of the I and D alleles. RESULTS: The frequency of the DD genotype was significantly increased in patients with malignant hypertension (43%) compared with patients with non-malignant hypertension (14%) and normotensive control subjects (18%) (p <0.01) for both. The frequency distribution of AGT M/T genotype did not differ between patients with malignant and non-malignant hypertension. CONCLUSION: The DD genotype of the ACE gene occurred more than twice as often in malignant hypertension than in non-malignant hypertension and indicates that ACE gene polymorphism is a significant risk factor for initiation of malignant hypertension.

[Endoscopic retrograde cholangio- pancreatography. An overview of procedures at the Natinal University Hospital in Reykjavik 1983-1992.].

INTRODUCTION: In this retrospective study we analysed all ERCP procedures performed at the National University Hospital in Reykjavik, Iceland, for the period 1983-1992. MATERIAL: A total of 644 procedures were performed on 477 patients. RESULTS: The main indication for a diagnostic ERCP was suspected choledocholithiasis in 58.8% of cases. Cannulation of the papilla of Vater was successfully achived in 94% of patients and in 82% the desired duct was visualised. Juxtapapillary diverticula were found in 14.5% of patients. The success at cannulation was significally less in that group. Choledocholithiasis was found in 19.4% more often in the patients with diverticula, 29.5 vs. 18.8%. The number of therapeutic interventions was 158 performed on 84 patients (24.5% of all ERCP). The most common procedure was sphincterotomy, performed in 84% of cases. Stone extraction was successfully achived in 58% of all attempts. The overall complications rate was 7%, most frequently acute pancreatitis (4.7%) followed by cholangitis (1.9%) and bleeding (0.3%). The complications were mild in the majority of cases but serious ones did occur and were fatal in three (0.5%) patients related to severe pancreatitis. CONCLUSION: The results of this retrospective study in Iceland are comparable to what others have reported previously.