Putative chromosomal deletions on 9P, 9Q and 22Q occur preferentially in malignant gastrointestinal stromal tumors

To characterize the type of genetic alterations in gastrointestinal stromal tumors (GISTs), we performed a comprehensive allelotype study of 14 GISTs (2 benign, 7 borderline and 5 malignant) by polymerase-chain-reaction and loss-of-heterozygosity (PCR-LOH) analysis using 102 microsatellite markers, and compared the results with comparative-genomic-hybridization (CGH) analysis. Among the 38 evaluated chromosomal arms, 16 (42.1%) showed LOH in at least one patient. Most frequent LOH was observed at chromosome 14p and 14q (9/14, 64%) and this was demonstrated in all types of GISTs (50% in benign, 71% in borderline and 80% in malignant). Additional chromosomal deletions were found in several chromosomal arms. Among them, deletions on chromosomal arms of 22q (3/14, 21.4%), 9p (2/14, 14.3%) and 9q (2/14, 14.3%) were the most frequent, and were detected only in malignant GISTs both by PCR-LOH and by CGH analysis. Additionally, 2 malignant GISTs with LOH on 9p showed homozygous deletions in the restricted area of 9p by multiplex PCR-LOH analysis. Thus, several putative chromosomal changes were preferentially present in malignant GISTs but rare in benign and borderline GISTs. These findings suggest that accumulated chromosomal changes may contribute to the progression and/or malignant transformation of GISTs.

Immunization of burn-patients with a Pseudomonas aeruginosa outer membrane protein vaccine elicits antibodies with protective efficacy

The aim of this study was to determine whether the antibodies raised in burn patients by active immunization with a Pseudomonas aeruginosa OMPs vaccine have a protective efficacy against infection with P. aeruginosa. The binding patterns with P. aeruginosa OMPs of immunized burn patient sera were similar to the sera of immunized healthy humans as determined by immunoblot and immunoprecipitation analyses. The sera pooled from immunized burn patients after three immunizations showed a significantly higher opsonophagocytic-killing activity than the corresponding pre-immune sera, while the sera from unimmunized patients collected at the same day did not. Passive immunization of mice with post-immune sera of burn patients significantly enhanced the survival rate upon a lethal challenge with P. aeruginosa compared to the pre-immune sera, indicating the protective ability of the antibodies induced in burn patients by immunization. These results suggest that anti-P. aeruginosa OMPs antibodies elicited in burn patients by active immunization are protective against infection with P. aeruginosa, and provide a rational for further development of the vaccine for prevention against P. aeruginosa infection in burn patients.

Pressure-derived fractional collateral blood flow: a primary determinant of left ventricular recovery after reperfused acute myocardial infarction

OBJECTIVES

We evaluated the relation between pressure-derived fractional collateral flow (PDCF) and left ventricular (LV) recovery after reperfused acute myocardial infarction (AMI).

BACKGROUND

The functional significance of collateral flow remains uncertain in AMI.

METHODS

The PDCF was measured in 70 patients with first AMI (pain onset <12 h) treated with primary angioplasty (PA), being determined by simultaneous measurement of mean aorta pressure (Pa), distal coronary pressure during the balloon occlusion (Poc), and central venous pressure (CVP): (Poc - CVP)/(Pa - CVP)*100. Sufficient collateral (group I) was defined as PDCF index >24% and insufficient collateral (group II) as PDCF index <24%. Echocardiography was performed before, and on day 3, day 7, and day 30 after PA. Wall-motion recovery index (RI) was obtained by dividing the number of improved wall-motion segments (>grade 1) at follow-up by the number of abnormal wall-motion segments within the infarct zone at baseline.

RESULTS

Baseline characteristics were similar between both groups. Peak levels of creatine kinase were lower in group I than in group II (2,600+/-1,900 U/liter vs. 4,100+/-3,000, p < 0.05). At one month, infarct zone wall-motion score index (1.65+/-0.54 vs. 2.31+/-0.46, p < 0.01) and LV volume indexes were smaller in group I than in group II, whereas, LV ejection fraction was higher in group I than in group II (52.8+/-8.3 vs. 45.9+/-9.0, p < 0.01). The PDCF index was the strongest predictor of RI at one month (r = 0.61, p < 0.01). Time to reperfusion was not related to RI at one month. However, it was significantly related to RI in group II (r = -0.34, p < 0.05).

CONCLUSIONS

The LV recovery after reperfused AMI is primarily determined by PDCF and is less dependent on time to reperfusion in patients with sufficient collaterals.

Putative chromosomal deletions on 9P, 9Q and 22Q occur preferentially in malignant gastrointestinal stromal tumors

To characterize the type of genetic alterations in gastrointestinal stromal tumors (GISTs), we performed a comprehensive allelotype study of 14 GISTs (2 benign, 7 borderline and 5 malignant) by polymerase-chain-reaction and loss-of-heterozygosity (PCR-LOH) analysis using 102 microsatellite markers, and compared the results with comparative-genomic-hybridization (CGH) analysis. Among the 38 evaluated chromosomal arms, 16 (42.1%) showed LOH in at least one patient. Most frequent LOH was observed at chromosome 14p and 14q (9/14, 64%) and this was demonstrated in all types of GISTs (50% in benign, 71% in borderline and 80% in malignant). Additional chromosomal deletions were found in several chromosomal arms. Among them, deletions on chromosomal arms of 22q (3/14, 21.4%), 9p (2/14, 14.3%) and 9q (2/14, 14.3%) were the most frequent, and were detected only in malignant GISTs both by PCR-LOH and by CGH analysis. Additionally, 2 malignant GISTs with LOH on 9p showed homozygous deletions in the restricted area of 9p by multiplex PCR-LOH analysis. Thus, several putative chromosomal changes were preferentially present in malignant GISTs but rare in benign and borderline GISTs. These findings suggest that accumulated chromosomal changes may contribute to the progression and/or malignant transformation of GISTs.

Coimmunization with IFN-gamma or IL-2, but not IL-13 or IL-4 cDNA can enhance Th1-type DNA vaccine-induced immune responses in vivo

As we explore the potential improvements to the current DNA vaccine strategies, it may be desirable to investigate methods to improve the level of resulting immune responses. One strategy is the use of cytokine cDNA as molecular adjuvants for DNA-based vaccines. Codelivery of these molecular adjuvants consisting of expression plasmid encoding for cytokines with DNA vaccine constructs is an effective method to modulate the magnitude and direction (humoral or cellular) of the immune responses. We have previously reported on the immunomodulatory effects of codelivering cDNA for interleukin-2 (IL-2) and IL-4 as molecular adjuvants for DNA-based vaccines. In this report, we extend these finding and compare the immunomodulatory effects of IL-2 and IL-4 with those of cDNA for prototypical Thl-type cytokine interferon-y (IFN-gamma) and Th2-type cytokine IL-13. We observed that distinct antigen-specific immune modulation can be achieved by the coinjection of IFN-gamma or IL-13 genes with DNA immunogen cassettes. We observed that IFN-gamma is a strong driver of Thl immune responses. Furthermore, in contrast to previous reports on their similarities in biologic activities, IL-13 and IL-4 cDNA coimmunizations modulated vaccine-induced immune responses differently in this model. Overall, these results further support the potential utility of this strategy as an important tool for the development of vaccines and immune therapies.

Stent placement for ostial left anterior descending coronary artery stenosis: acute and long-term (2-year) results

This study was performed to assess the acute and long-term results of elective stenting for the treatment of ostial left anterior descending coronary artery (LAD) stenosis. One hundred and eleven consecutive patients with ostial LAD stenting were included for this study. Follow-up angiography was performed at 6 months and clinical evaluation at regular intervals after stenting. Procedural success rate was 97.3%. Four patients developed non-Q myocardial infarction and one patient underwent emergency bypass surgery due to a large dissection after stenting. Angiographic restenosis rate was 26.1% (18/69), and target lesion revascularization rate 11.7%. The final luminal diameter after stenting was the only predictor of angiographic restenosis. Clinical follow-up was obtained in all patients at 21.5 +/- 16.0 months. Two patients died during the follow-up. Event-free survival rate was 84.6 +/- 3.8%. In conclusions, stenting with or without debulking atherectomy may be considered as an acceptable therapeutic option for the treatment of ostial LAD stenosis.

Intravascular ultrasonic predictors of angiographic restenosis after long coronary stenting

The intravascular ultrasound (IVUS) criteria for stent optimization have not been determined in stenting long lesions. We evaluated the predictors of angiographic restenosis and compared it with stent lumen cross-sectional area (CSA) and stent length between short (stent length <20 mm) and long (> or =20 mm) coronary stenting. IVUS-guided coronary stenting was successfully performed in 285 consecutive patients with 304 native coronary lesions. Six-month follow-up angiogram was performed in 236 patients (82.8%) with 246 lesions (80.9%). Results were evaluated using conventional (clinical, angiographic, and IVUS) methods. The overall angiographic restenosis rate was 22.8% (56 of 246 lesions) (short stent 17.6% vs. long stent 32.2%, p = 0.009). Using multivariate logistic regression analysis, the independent predictors of angiographic restenosis were the IVUS stent lumen CSA (odds ratio 1.51, 95% confidence intervals 1.18 to 1.92, p = 0.001) and stent length (odds ratio 0.95, 95% confidence intervals 0.91 to 1.00, p = 0.039). The angiographic restenosis rate was 54.8% for stent lumen CSA of <5.0 mm2 (short stent 37.5% vs. long stent 73.3%, p = 0.049), 27.4% for CSA between 5.0 and 7.0 mm2 (short stent 24.1% vs. long stent 31.7%, p = 0.409), 10.5% for CSA between 7.0 and 9.0 mm2 (short stent 10.0% vs. long stent 12.5%, p = 0.772), and 11.4% for stent lumen CSA of > or =9.0 mm2 (short stent 10.4% vs. long stent 13.3%, p = 0.767) (p = 0.001). Compared with short coronary stenting, long coronary stenting is effective treatment modality to cover long lesions with comparable long-term clinical outcomes in cases of stent lumen CSA of > or =7.0 mm2. Regardless of the stent length, the most important factor determining angiographic restenosis was the IVUS stent lumen CSA in relatively large coronary artery lesions.

Expression of protein kinase C genes in normal (+/+) and W mutant alleles (Wsh/Wsh, W/Wv) mice testes

In the present study, we investigated the expression of mRNA of protein kinase C (PKC) isoenzymes (alpha, beta, gamma, delta, epsilon, zeta, eta, and theta) in normal (+/+) and W mutant alleles mice testes. In +/+ mice testes, abundant expression of PKCdelta and PKCtheta was observed, while other PKCs (alpha, beta, gamma, epsilon, zeta, and eta) generally were not detected by Northern blotting. The PKCdelta and PKCtheta isoenzymes demonstrated a distinctive cellular distribution when evaluated by in situ hybridization. We have previously shown that PKCdelta gene was selectively expressed in spermatid of +/+ testes. Here we show that PKCdelta gene is also present in spermatid of Wsh/Wsh mice testes and PKCtheta gene was present in interstitial cells of +/+, Wsh/Wsh, and W/Wv mice testes. These studies provide the evidence of selective cell distributions of the PKC isoenzymes and suggest that PKC has the functional significance in testes.

All-trans-retinoic acid attenuates neointima formation with acceleration of reendothelialization in balloon-injured rat aorta

Retinoic acids may inhibit vascular smooth muscle cell proliferation, but may promote endothelial cell proliferation in cell culture. However, little data are available about the effects of all-trans-retinoic acid (ATRA) on endothelial regeneration and functional recovery in an experimental model of vascular injury. Accordingly, we investigated whether ATRA may attenuate neointima formation and accelerate endothelial regeneration with functional recovery in balloon-injured rat aorta. Twelve-week-old male Sprague-Dawley rats underwent endothelial denudation of the thoracic aorta by balloon injury. Fourteen rats were fed a standard rat pellet diet. Another 14 rats were fed ATRA (1.5 mg/day) for 2 weeks. The animals were killed on day 14 for organ chamber study and morphometric analysis. Rats in the ATRA group had a significantly improved acetylcholine-induced relaxation response than those in control group. However, endothelial independent response was not significantly different between the two groups. The extent of reendothelialization was markedly superior in the ATRA group compared with control group (p<0.05). Furthermore, neointima area and the ratio of neointima to medial area were significantly less in ATRA group than in control group (p<0.05). In conclusion, ATRA may accelerate endothelial regeneration with functional recovery, and attenuate neointima formation in balloon-injured rat aorta.

Microsatellite instability in gastric intestinal metaplasia in patients with and without gastric cancer

The role and significance of microsatellite instability (MSI) in gastric carcinogenesis remain unknown. This study determined the chronology of MSI in gastric carcinogenesis by examining intestinal metaplasia (IM) from patients with and without gastric cancer. DNA was obtained from gastric specimens of 75 patients with gastric IM (30 cancer, 26 peptic ulcer, and 19 chronic gastritis patients) and was amplified with a set of eight microsatellite markers. Eight (26. 7%) tumors and seven (9.3%) IM samples (three from cancer-free patients) displayed high-level MSI (three or more loci altered). Low-level MSI (one or two loci altered) was detected in 50% of the tumors, in 40% of IM samples coexisting with cancer, and in 38% of IM tissues of cancer-free individuals. Among the 30 cancer patients, microsatellites were more frequently altered in IM coexisting with tumors that showed MSI (P = 0.003). In addition, patients with low-level MSI in the tumor tissues were more likely to have active Helicobacter pylori infection than those with stable tumors (P = 0.02). In conclusion, this study indicates that MSI occurs not only in gastric IM of patients with gastric carcinoma, but also in IM of cancer-free individuals. These data suggest that the progressive accumulation of MSI in areas of IM may contribute to gastric cancer development, representing an important molecular event in the multistep gastric carcinogenesis cascade.

Macrophage colony-stimulating factor can modulate immune responses and attract dendritic cells in vivo

Studies have indicated that professional APCs in the periphery, such as dendritic cells and macrophages, play an important role in initiating DNA vaccine-specific immune responses. To engineer the immune response induced by DNA vaccines in vivo we investigated the modulatory effects of codelivering growth factor genes for the hematopoietic APCs along with DNA vaccines. Specifically, we examined the effects on the antigen-specific immune responses following the codelivery of the gene expression cassettes for M-CSF, G-CSF, and GM-CSF along with HIV-1 DNA immunogen constructs. We observed that coimmunization with GM-CSF increased the antibody response and resulted in a significant enhancement of lymphoproliferative response. Furthermore, among all coinjection combinations, we found that M-CSF coinjections resulted in a high level of CTL enhancement. This enhancement of CTL responses observed from the coinjection with M-CSF was CD8+ T cell dependent and was associated with the presence of CD11c+ cells at the site of injection and with the antigen-specific induction of the beta-chemokine MIP-1beta, suggesting a role for this chemokine in CTL induction. These results suggest that hematopoietic growth factors should be further studied as potential adjuvants for in vivo modulators of immune responses.

Long-term clinical and echocardiographic outcome of percutaneous mitral valvuloplasty: randomized comparison of Inoue and double-balloon techniques

OBJECTIVES

The purpose of the present study was to compare the long-term clinical and echocardiographic results of the Inoue and the double-balloon techniques.

BACKGROUND

The large randomized trial comparing the extent of commissurotomy and the long-term results between the double-balloon and Inoue balloon techniques has not been reported.

METHODS

We conducted a prospective, randomized trial comparing two procedures in 302 consecutive patients who underwent percutaneous mitral valvuloplasty (PMV) using Inoue (n = 152; group I) or double-balloon technique (n = 150, group D) between 1989 and 1995. The sample size was planned to provide the study with approximately 80% power for the detection of a 10% difference between the two groups.

RESULTS

There were no significant differences in baseline characteristics between the two groups. Immediately after PMV, mitral valve area (MVA) increased from 0.9 +/- 0.2 to 1.8 +/- 0.3 cm2 in group I and from 0.9 +/- 0.2 to 1.9 +/- 0.3 cm2 in group D. No significant differences existed between the two groups in terms of development of commissural splitting, commissural mitral regurgitation (CMR), moderate to severe mitral regurgitation (MR) and MVA after PMV. The successful immediate results (MVA > or =1.5 cm2 and MR < or =2) were achieved in 127 (84%) patients of group I and 122 (81%) patients of group D (p = NS). Annual clinical and echocardiographic evaluation was completed for 290 (96%) patients with mean follow-up of 51 +/- 27 months. Adverse events occurred in 19 (13%) patients of group I (3 deaths, 7 mitral valve replacements, 5 repeat PMV, 2 NYHA class > or =3, 2 technical failures) and 16 (11%) patients of group D (2 deaths, 10 mitral valve replacements, 3 repeat PMV, 1 NYHA class > or =3). Estimated actuarial seven-year event-free survival was 75 +/- 7% in group I and 82 +/- 6% in group D (p = NS). Estimated actuarial seven-year restenosis-free survival was 67 +/- 7% in group I and 76 +/- 6% in group D (p = NS). On multivariate analysis, unsuccessful immediate result (p < 0.001) and absence of CMR (p < 0.01) were independently related with events. Absence of CMR and smaller mitral valve area after PMV were independently related with restenosis (p < 0.001).

CONCLUSIONS

The Inoue and double-balloon techniques were equally effective in commissurotomy and produced similar, excellent long-term results. The achievement of complete commissurotomy with development of CMR or larger post-PMV mitral valve area is important to optimize the long-term results of PMV.

MR findings of desmoplastic fibroma of the spine. A case report

We report on the MR imaging findings in a case of spinal desmoplastic fibroma (DF). DF of the bone is a rare, locally aggressive tumor. It is commonly located in long bones, pelvis or mandible. DF involving the spine is extremely rare and difficult to distinguish from other bony lesions such as giant cell tumor, chordoma and fibrous dysplasia of the spine. This case of DF of the spine showed MR findings similar to those of DF arising in the metaphysis of a long bone.

Mutational analysis of the binding site residues of the bovine cation-dependent mannose 6-phosphate receptor

Mannose 6-phosphate receptors (MPRs) deliver soluble acid hydrolases to the lysosome in higher eukaryotic cells. The two MPRs, the cation-dependent MPR (CD-MPR) and the insulin-like growth factor II/cation-independent MPR, carry out this process by binding with high affinity to mannose 6-phosphate residues found on the N-linked oligosaccharides of their ligands. To elucidate the key amino acids involved in conveying this carbohydrate specificity, site-directed mutagenesis studies were conducted on the extracytoplasmic domain of the bovine CD-MPR. Single amino acid substitutions of the residues that form the binding pocket were generated, and the mutant constructs were expressed in transiently transfected COS-1 cells. Following metabolic labeling, mutant CD-MPRs were tested for their ability to bind pentamannosyl phosphate-containing affinity columns. Of the eight amino acids mutated, four (Gln-66, Arg-111, Glu-133, and Tyr-143) were found to be essential for ligand binding. In addition, mutation of the single histidine residue, His-105, within the binding site diminished the binding of the receptor to ligand, but did not eliminate the ability of the CD-MPR to release ligand under acidic conditions.

Evaluation of the photosensitive patient

Evaluation of photosensitivity involves the following sequential steps. A history is useful to evaluate possible exposure to know photosensitizers, characteristics of the light-induced eruption, family history, and possible involvement of other organ systems. Distribution and morphology of the cutaneous lesions should help to delineate the disorder. Phototesting is helpful in documenting decrease in the minimal erythema doses. Photopatch testing is indicated when history and physical examination suggest the possibility of photoallergic dermatitis. Other useful investigations include skin biopsy, antinuclear antibody panel, and when appropriate, plasma porphyrin.

Differential regulation of MAP kinase cascade in human colorectal tumorigenesis

Hyper-activation of mitogen-activated protein kinase (MAPK) has recently been reported in several human cancers and activation of MAPK in those cancers may be associated with carcinogenesis through aberrant cell proliferation. To understand the roles of the MAPK pathway in colorectal tumorigenesis, we examined the status of extracellular signal-regulated protein kinases (ERK1/2) in 21 colorectal tumour specimens and compared it with that of paired normals. The specific MAPK activities were two- to tenfold lower in 71% (15 out of 21 cases) of colorectal tumours compared to those in paired normals. The individual MAPK kinase (MEK) correlated with MAPK activities (P = 0.006). Reduction of the MAPK and MEK activities in colorectal tumours was also observed in adenomas. These results suggested that down-regulation of the MAPK cascade may be caused by early genetic event(s) and that it may be related to the loss of normal growth control. Although MAPK activities were down-regulated both in adenomas and carcinomas, activities of the MAPKs in carcinomas were higher than those of paired adenomas. These results suggested that MAPK activities may be increased in the adenoma-to-carcinoma sequence and that it may play a role in the tumour progression. Observation of the differential regulation of MAPK activities in colorectal tumorigeneis suggested roles for the MAPK pathway in both positive and negative controls of cell growth.

The etiologic role of gastric hypersensitivity in functional dyspepsia in Korea

To evaluate the role of gastric hypersensitivity and the relationship between gastric hypersensitivity and delayed gastric emptying in Korean functional dyspepsia (FD) patients, the authors performed gastric barostat and gastric emptying scintigraphy in 64 FD patients and compared these results with those of control subjects. Basal tones and gastric compliance were similar in control subjects and patients. However, threshold of abdominal discomfort was lower in FD patients than in control subjects (8.9 +/- 3.6 mmHg and 14.5 +/- 3.7 mmHg respectively; p < 0.05). Twenty-four of 64 patients (37.5%) experienced abdominal discomfort at a pressure less than 7 mmHg above minimal distending pressure (corresponding to the 95th percentile of normal values). Half time of solid-phase gastric emptying in patients and control subjects was not significantly different. Twenty-three of 64 patients (35.9%) had delayed gastric emptying compared with control subjects (normal ranges were mean +/- two standard deviations in control subjects). Thresholds of abdominal discomfort were not significantly different in patients with and without delayed gastric emptying (9.3 +/- 4.0 mL/mmHg vs. 8.6 +/- 3.3 mL/mmHg). There were also no significant differences in the proportion of patients with delayed gastric emptying between patients with and without gastric hypersensitivity. In conclusion, gastric hypersensitivity plays an important role in FD, and the presence of gastric hypersensitivity was not related to the presence of delayed gastric emptying.

Blastocyst invasion and the stromal response in primates

One of the most remarkable processes associated with the establishment of pregnancy in the primate is the process of decidualization. This transformation of a stromal fibroblast to a fully differentiated decidual cell is required for implantation and embryo survival in early pregnancy. Although the morphological and biochemical characteristics of the primate decidual cell have been extensively studied, the precise cellular, biochemical and molecular signals required for this transformation have yet to be elucidated. During decidualization, stromal cells first proliferate and then differentiate. Based on our extensive in-vivo and ongoing in-vitro studies, we have suggested that the process of decidualization in the baboon can be divided into two distinct phases. The initial proliferative phase is characterized by the expression of the cytoskeletal protein alpha smooth muscle actin (alphaSMA) in the stromal fibroblasts and is independent of the presence of the conceptus. The second phase of differentiation is characterized by the expression of insulin-like growth factor binding protein-1 (IGFBP-1) and the down-regulation of alphaSMA in the decidualized stromal fibroblast. The expression of IGFBP-1 is dependent on the presence of the conceptus in vivo and is regulated by hormones and cAMP in vitro. We have postulated that, during the initial phase of stromal cell differentiation, alphaSMA expression is regulated by the interaction between stromal cell integrins with the secreted extracellular matrix proteins (ECM). In response to pregnancy a trophoblast 'factor', mediated by cAMP signal transduction, induces IGFBP-1 expression in decidualizing stromal fibroblasts. This induction of IGFBP-1 is associated with the disappearance of alphaSMA and de-novo protein synthesis. Our comparative studies suggest that the process of decidualization in the human and baboon involve similar mechanisms. However, the metabolic pathways required for decidualization in the two species appear to differ in their degree of sensitivity to external stimuli. This review focuses on the cellular events that may potentially regulate decidualization in the primate and its role in regulating trophoblast migration.

Intravascular ultrasound comparison of chronic recoil among different stent designs

Intravascular ultrasound studies were acquired in 70 native coronary artery lesions after implantation and at follow-up of Palmaz-Schatz, GFX, NIR, and CrossFlex stents. Chronic stent recoil was minimal in the Palmaz-Schatz, GFX, and NIR stents; however, there was small, but significant chronic recoil of the CrossFlex stent.

Lack of association of Helicobacter pylori infection with gastric hypersensitivity or delayed gastric emptying in functional dyspepsia

OBJECTIVE

We evaluated the relationship between Helicobacter pylori (H. pylori) infection and gastric sensitivity to distention or gastric emptying rate to define the role of H. pylori in the pathogenesis of functional dyspepsia.

METHODS

Gastric barostat, gastric emptying scintigraphy, and 13C urea breath test were performed in 34 consecutive patients with functional dyspepsia.

RESULTS

Between H. pylori-positive and -negative patients with functional dyspepsia, there were no significant differences in basal tone (57.2 +/- 15.0 ml vs 66.8 +/- 18.3 ml), compliance (41.0 +/- 11.2 ml/mm Hg vs 38.2 +/- 11.8 ml/mm Hg), threshold of first sense (3.6 +/- 2.7 mm Hg vs 2.3 +/- 1.5 mm Hg), threshold of abdominal discomfort (9.4 +/- 4.0 mm Hg vs 7.3 +/- 1.9 mm Hg), and postprandial receptive relaxation (115.4 +/- 89.7 ml vs 99.0 +/- 88.7 ml), measured by gastric barostat. Half gastric emptying time (88.6 +/- 24.5 min vs 91.4 +/- 21.6 min) and retention rate at 120 min (32.8 +/- 17.8% vs 41.9 +/- 20.1%) were also similar between the two groups.

CONCLUSION

H. pylori infection was not associated with gastric hypersensitivity to distention or delayed gastric emptying.

Human frontal cortex: an MRI-based parcellation method

The frontal lobe is not a single anatomical and functional brain region. Several lines of research have demonstrated that particular subregions within the frontal lobe are associated with specific motor and cognitive functions in the human being. Our main purpose is to develop a magnetic resonance image (MRI)-based parcellation method of the frontal lobe that permits us to explore plausible abnormalities in functionally relevant frontal subregions in brain illnesses. We describe a procedure using MRI for subdividing the entire frontal cortex into 11 subregions: supplementary motor area (SMA), rostral anterior cingulate gyrus (r-ACiG), caudal anterior cingulate gyrus (c-ACiG), superior cingulate gyrus (SCiG), medial frontal cortex (MFC), straight gyrus (SG), orbitofrontal cortex (OFC), precentral gyrus (PCG), superior frontal gyrus (SFG), inferior frontal gyrus (IFG), and middle frontal gyrus (MFG). Our method posits to conserve the topographic uniqueness of individual brains and is based on our ability to visualize both the three-dimensional (3D) rendered brain and the three orthogonal planes simultaneously. The reliability study for gray matter volume and surface area of each subregion was performed on a set of 10 MR scans by two raters. The intraclass R coefficients for gray matter volume of each subregion ranged between 0.86 and 0.99. We describe here a reproducible and reliable topography-based parcellation method of the frontal lobe that will allow us to use new approaches to understand the role of particular frontal cortical subregions in schizophrenia and other brain illnesses.

Structural basis for recognition of phosphorylated high mannose oligosaccharides by the cation-dependent mannose 6-phosphate receptor

Mannose 6-phosphate receptors (MPRs) play an important role in the targeting of newly synthesized soluble acid hydrolases to the lysosome in higher eukaryotic cells. These acid hydrolases carry mannose 6-phosphate recognition markers on their N-linked oligosaccharides that are recognized by two distinct MPRs: the cation-dependent mannose 6-phosphate receptor and the insulin-like growth factor II/cation-independent mannose 6-phosphate receptor. Although much has been learned about the MPRs, it is unclear how these receptors interact with the highly diverse population of lysosomal enzymes. It is known that the terminal mannose 6-phosphate is essential for receptor binding. However, the results from several studies using synthetic oligosaccharides indicate that the binding site encompasses at least two sugars of the oligosaccharide. We now report the structure of the soluble extracytoplasmic domain of a glycosylation-deficient form of the bovine cation-dependent mannose 6-phosphate receptor complexed to pentamannosyl phosphate. This construct consists of the amino-terminal 154 amino acids (excluding the signal sequence) with glutamine substituted for asparagine at positions 31, 57, 68, and 87. The binding site of the receptor encompasses the phosphate group plus three of the five mannose rings of pentamannosyl phosphate. Receptor specificity for mannose arises from protein contacts with the 2-hydroxyl on the terminal mannose ring adjacent to the phosphate group. Glycosidic linkage preference originates from the minimization of unfavorable interactions between the ligand and receptor.

Altered contractile response of penis under hypoxia with metabolic acidosis

Previous studies concerning ischemic priapism revealed that hypoxia alters the erectile and contractile responses of penis. But the effects of accompanying acidosis on those responses have not been fully evaluated or understood yet. We performed this study to elucidate the role of acidosis on the trabecular smooth muscle contractility like in ischemic priapism. Under the general anesthesia, 55 mature male cats were conditioned to systemic metabolic acidosis by hypoventilation by animal ventilator. The changes of intracavernous pressure (ICP) to erectogenic agents (acetylcholine, L-arginine, prostaglandin E1: PGE1), erectolytic agents (epinephrine, thromboxane A2; TXA2), K channel-related drugs (pinacidil, 4-aminopyridine, tetraethylammonium; TEA, glibenclamide) and calcium ionophore were monitored at Set 1 (PO2 > 60 mmHg, pH > 7.25), Set 2 (PO2 < 30 mmHg, 7.25 > pH > 7.0), Set 3 (PO2 < 30 mmHg, pH < 7.0), and Set 4 (PO2 > 60 mmHg, pH < 7.0) in vivo. At Set 1 and Set 2, epinephrine, TXA2, and ionomycin decreased the ICP by acetylcholine or PGE1 (n = 9, P < 0.01). The decrease of ICP was in order of epinephrine, TXA2 and ionomycin. Acidosis reduced the increase of ICP to acetylcholine or PGE1 (n = 8, P < 0.01), TXA2 or ionomycin did not affect ICP under severe acidosis but epinephrine decreased ICP even under severe acidosis (n = 7, P < 0.05). Pretreatment of potassium channel blockers did not suppress the increase of ICP by erectogenic agents under acidosis (n = 6, P < 0.05). Pinacidil did not affect ICP under acidosis (n = 6, P < 0.01). These results suggest that acidosis impairs the contractile response of cavernous smooth muscle to erectolytic agents. It may be the results of the interference by [H+] with the intra and extracellular mechanisms that regulate the homeostasis of [Ca2]. Conclusively, besides hypoxia, acidosis is another limiting factor of trabecular smooth muscle contractility like in ischemic priapism.

Prenatal detection of de novo inversion of chromosome 9 with duplicated heterochromatic region and postnatal follow-up

We report the first de novo case of a heterochromatic duplication on the long arm of the chromosome 9, which then was pericentrically inverted at p11q13. This condition was detected prenatally and carry to term. We then performed the follow up for over 1 year. So far, there seems to be no phenotypical abnormalities.