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Biomedical subjects

M Wasa

Publications and source records attributed to M Wasa.

At least 19 recordsLinked to original sources

Successful laparoscopic fundoplication in children with ventriculoperitoneal shunts.

We reported successful laparoscopic fundoplication in 2 pediatric cases with VPS and discuss the safety and feasibility of the procedure. Case 1: A 13-year-old girl with VPS underwent laparoscopic fundoplication. Case 2: a 9-year-old boy with VPS underwent laparoscopic fundoplication. In both cases, laparoscopic Nissen fundoplication was performed with a standard five-port technique with a low pressure of a pneumoperitoneum. The VPS system had no effect on port layout and intraabdominal manipulation and no adverse complications were observed in either case. The effect of a pneumoperitoneum in the VPS system remains controversial, however, the author emphasized that advanced laparoscopic surgery can be performed safely with creating a low pressure of a pneumoperitoneum.

Adolescent↗

Regulation of glutamine transport by the type I insulin-like growth factor receptor in a human neuroblastoma cell line.

We examined the effects of the monoclonal antibody against the type I insulin-like growth factor receptor (IGF-IR), alphaIR3, on cell growth and membrane glutamine (Gln) transport in a human neuroblastoma cell line, SK-N-SH. In the presence of alphaIR3 (2 microg/ml), the cell proliferation rate was significantly attenuated. Gln transport was decreased in the alphaIR3-treated group with the mechanism of decreasing maximum transport velocity without affecting transport affinity. The addition of alphaIR3 significantly decreased DNA and protein biosynthesis. Our results support the concept that the activation of IGF-IR partially mediates neuroblastoma cell proliferation by regulating membrane Gln transport.

Apoptosis↗

Insulin-like growth factor-I stimulates amino acid transport in a glutamine-deprived human neuroblastoma cell line.

It is still unknown how insulin-like growth factor-I (IGF-I) regulates cancer cell growth in the condition of the limited availability of key nutrients, such as glutamine. We investigated the effects of IGF-I on cell growth and amino acid transport in a glutamine-deprived human neuroblastoma cell line, SK-N-SH. Cell growth was measured, and 3H-labeled amino acid transport was assayed after treatment with or without IGF-I (50 ng/ml) in 2 mM (control) and 100 microM glutamine concentrations. Cell growth rates were dependent on glutamine concentrations. IGF-I stimulated cell growth in both 2 mM and 100 microM glutamine. IGF-I stimulated glutamine transport in 100 microM glutamine with the mechanism of increasing carrier Vmax, but had no effect in 2 mM glutamine. IGF-I also stimulated leucine, glutamate and 2-(methylamino)isobutyric acid transport in 100 microM glutamine. There were significant increases in [3H]thymidine and [3H]leucine incorporation in IGF-I-treated cells in both 2 mM and 100 microM glutamine. These data suggest that IGF-I stimulates cell growth by increasing amino acid transport in the condition of low glutamine levels in a human neuroblastoma cell line. This mechanism may allow to maintain cell growth even in nutrient-deprived tumor tissues.

Amino Acids↗

Three-dimensional pressure imaging: a novel method for intraoperative manometry during laparoscopic esophagomyotomy for esophageal achalasia.

With the introduction of computerized manometry, the creation of the three-dimensional (3-D) pressure image with measurement of pressure vector volume (PVV) has become available to assess the pressure structure of the high-pressure zone (HPZ) of the distal esophagus. We have applied this technique to intraoperative manometry during laparoscopic surgery for esophageal achalasia (EA). A laparoscopic esophagomyotomy with anterior fundoplication was performed in a 12-year-old boy with EA. Computerized 3-D images were obtained by a stepwise pullback of a manometric assembly with eight radial side-holes to quantitate the PVV of the HPZ of the distal esophagus in each stage of the operation for EA. Virtual abolishment of the peak pressure image and a marked reduction in the PVV after esophagomyotomy suggested appropriate decompression of the HPZ. Intraoperative manometry using computerized 3-D pressure imaging with measurement of the PVV is thus useful to assess the HPZ during laparoscopic surgery for EA.

Child↗

Nitric oxide synthase inhibitor attenuates inflammatory lesions in the skin of zinc-deficient rats.

Skin lesions are common manifestations of zinc deficiency in humans and animals, but the pathogenic mechanisms have not been fully clarified. In the present study, a nitric oxide synthase inhibitor, NG-nitro-L-arginine methyl ester (L-NAME), was given to zinc-deficient (ZD) rats to see whether it prevents or delays the occurrence of skin lesions. Weanling male rats were given free access to a ZD diet (2 mg zinc/kg) for 4 wk to induce zinc deficiency. Control rats, including pair-fed (PF) and ad libitum (AL) groups, were given a diet supplemented with zinc (50.8 mg zinc/kg. L-NAME (0.3 g/L in drinking water) was given to some ZD rats for 3 wk, starting at the second week of their ZD dieting. Dermatitis of the extremities, balanitis, stomatitis, and alopecia appeared in ZD but not in AL and PF rats. Administration of L-NAME significantly reduced the frequency of cutaneous and mucocutaneous inflammatory lesions but did not prevent alopecia in the ZD rats. Reverse transcription polymerase chain reaction showed that inducible nitric oxide synthase mRNA was expressed in the paw skin of ZD but not of AL and PF rats. Evaluation of skin microvascular permeability by the Evans blue leakage technique indicated that L-NAME administration significantly attenuated extravasation of Evans blue in the paw skin of ZD rats. Furthermore, stains positive for terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labeling were condensed and diffusely distributed over the epidermis, dermis, and subcutaneous tissue of paws in ZD rats. ZD rats had intense cell infiltration and parakeratosis in the paw skin. L-NAME administration effectively prevented these morphologic changes. These results demonstrate that nitric oxide synthase inhibitor ameliorates inflammatory lesions of the skin in ZD rats.

Animals↗

Diagnostic significance of pancreas divisum in early life.

Pancreas divisum (PD) is a congenital anomaly in which the ventral and dorsal pancreatic ducts fails to fuse in the early fetal period. This anomaly has been known to rarely cause recurrent pancreatitis and to require surgical intervention. With the recent advances in image diagnostic procedures, an increasing incidence of this anomaly has been recognized in the pediatric age group. Seven cases of PD were encountered in our institution between 1978 and 1998. Six were female and one was male, with a mean age of 8 years. All cases were diagnosed to have PD by endoscopic retrograde pancreatography (ERCP) or operative pancreatography. One case (14.3%) had PD associated with a bout of pancreatitis and was operated on by transduodenal papilloplasty, but recurrent bouts of pancreatitis led to the performance of longitudinal pancreaticojejunostomy (Puestow procedure). Six cases (85.7%) were found to have PD as an incidental finding during operation for congenital dilatation of the bile ducts (CDBD), however, 2 cases (33.3%) out of the 6 developed pancreatitis in a later stage and ERCP was effective in their follow-up assessment. One benefited from conservative treatment while the other needed transduodenal papilloplasty along with pancreatoductoplasty. Imaging procedures (ERCP or operative pancreatography) revealed complete PD in 3 cases (42.9%), and incomplete PD in 4 cases (57.1%), however, there was no clinically significant difference between the groups.

Bile Ducts↗

Laparoscopic esophagomyotomy with dor anterior fundoplication in a child with achalasia.

Laparoscopic myotomy with anterior fundoplication was successfully performed on a 12-year-old boy with esophageal achalasia. After completion of a longitudinal esophagocardiomyotomy approximately 6 cm in length, a 180 degrees fundic patch was sutured anteriorly to the myotomized esophagus according to the Dor-Gavriliu technique. The patient showed a rapid and uneventful recovery with complete resolution of his preoperative symptoms. The nonobstructive antireflux procedure can be safely performed concomitantly with another surgery, even in a pediatric patient.

Child↗

Intestinal adaptation in pediatric patients with short-bowel syndrome.

The purpose of this study is to evaluate 12 pediatric short-bowel syndrome (SBS) patients experienced at Osaka University Hospital and its affiliated hospitals and to study the intestinal length for achieving intestinal adaptation and the metabolic characteristics. The length of the residual small intestine ranged from 0 to 75 cm with an average of 47 cm and an ileocecal valve had been resected in five cases. Total parenteral nutrition (TPN) was started immediately after operation and was gradually substituted by enteral nutrition. No patient died during the follow-up period. Eight of 12 patients could be weaned from TPN with residual intestinal length of 27 to 75 cm (mean 57 cm). Four patients with the residual intestine of 0 to 45 cm (mean 22 cm) were unable to achieve intestinal adaptation. The rate of catheter-related sepsis per 1000 catheter days was 0.63. Fatty liver was detected in two cases, but no patient developed progressive liver failure. Plasma arginine and citrulline were decreased in patients who were unable to achieve intestinal adaptation. Our nutritional support program provided excellent survival for pediatric SBS patients primarily due to the low incidence of catheter-related sepsis and no episode of severe liver disease. Patients with more than 16 cm of residual intestinal length can be expected to be weaned from TPN.

Adaptation, Physiological↗

Nitric oxide synthase inhibitor attenuates intestinal damage induced by zinc deficiency in rats.

A nitric oxide synthase (NOS) inhibitor, NG-nitro-L -arginine methyl ester (L-NAME), was given to zinc-deficient (ZD) rats to determine whether it prevents the intestinal damage usually observed under these conditions. Weanling male rats were given free access to a ZD diet (2 mg zinc/kg), whereas control rats including pair-fed (PF) and ad libitum consumption (AL) groups were given a zinc-supplemented (50.8 mg zinc/kg) diet for 4 wk. Half of the ZD rats received L-NAME (0.3 g/L in drinking water) for 3 wk starting at the wk 2 of the deficient period. Plasma zinc concentration in ZD rats was significantly lower (P < 0.05) than that of AL and PF rats. Administration of L-NAME did not alter this concentration. Intestinal zinc concentration did not differ among groups. However, metallothionein-1 (MT-1) mRNA level was significantly lower in the intestine of ZD rats than in AL or PF rats. Treatment of ZD rats with L-NAME did not affect this level. Intestinal microvascular permeability evaluated by Evans blue showed significantly higher extravasation in ZD rats than in AL rats, whereas L-NAME administration inhibited the extravasation. Expression of inducible NOS mRNA was observed in intestine of ZD but not of AL or PF rats, and there was no significant difference between ZD rats, regardless of L-NAME treatment. The activity ratio of inducible NOS to total NOS in ZD rats not receiving L-NAME was significantly higher than that in AL rats or ZD rats treated with L-NAME (P < 0.05). The number of apoptotic-positive and goblet cells in intestinal villi was significantly higher in ZD rats compared with AL or PF rats. L-NAME administration in ZD rats reversed this effect. These results indicate that inhibition of NOS ameliorates zinc deficiency-induced intestinal damage in rats.

Animals↗

The importance of the plasma amino acid molar ratio in patients with biliary atresia.

BACKGROUND: Plasma amino acid patterns and the therapeutic benefits of amino acid supplements are not examined well in postoperative patients with biliary atresia (BA). This study aimed to investigate profiles of the amino acid molar ratio, the Fischer molar ratio (FR, valine + leucine + isoleucine/phenylalanine + tyrosine), and relationships with other nutritional parameters and to assess the efficacy of enteral nutrient preparations for hepatic failure in patients with BA. METHODS: In study 1 profiles of FR were analyzed in 24 patients with BA (aged 3 to 12 years) in the postoperative period and compared with liver function tests and anthropometric measures. In study 2 10 patients with BA with a FR < 2.0 were begun on a dietary regimen consisting of an ordinary diet supplemented with a branched-chain amino acid-enriched elemental diet. RESULTS: Study 1: In jaundiced patients with total bilirubin levels > 2.0 mg/dL the FR remained below 2.0 throughout the period of observation, in contrast with nonjaundiced patients. The FR was closely related to the levels of serum albumin and plasma rapid turnover proteins and anthropometric measures as well as biochemical data reflecting intrinsic liver function. Study 2: A significant increase in rapid turnover proteins and improvement of general status were noted concurrently with an increase of the FR. CONCLUSIONS: The FR indicates a combination of nutritional status and intrinsic liver function in post-operative BA patients. The FR is a useful parameter in conducting nutritive therapy with a branched-chain amino acid-enriched elemental diet in those patients.

Adolescent↗

Expression of NOS II and its role in experimental small bowel ulceration in rats.

BACKGROUND: Overproduction of nitric oxide (NO) has been implicated in the pathogenesis of experimental and clinical inflammatory bowel disease (IBD). METHODS: We observed the expression and localization of inducible NO synthase (NOS-II) in small intestinal ulceration induced by indomethacin in rats. The role of NO was investigated by using NO synthase inhibitors. RESULTS: The small intestine was affected by longitudinal ulcers after indomethacin administration and ulceration was associated with distinctive expression of NOS-II protein and mRNA. The amount of its expression was found to correlate with the extent of inflammation. Histologically, both immunohistochemistry and in situ hybridization revealed a similar localization of NOS-II to inflammatory and epithelial cells. The possible amelioration of the inflammation was modulated by aminoguanidine (AG) and NG-nitro-L-arginine methyl ester (L-NAME) treatment for 10 days. Both AG and L-NAME attenuated intestinal myeloperoxidase activity and gross inflammation, only AG was found to decrease intestinal permeability with a significant amelioration of body weight loss. CONCLUSION: These findings indicate that NO derived mainly from inflammatory cells may play an important role in the pathophysiology of intestinal ulceration and offer the potential for future treatment directed at blocking neutrophils recruitment and NO overproduction in IBD.

Animals↗

Revision laparoscopy for incarcerated hernia at a 5-mm trocar site following pediatric laparoscopic surgery.

We report the case of a 6-month-old female infant who developed post-operative bowel obstruction due to an incarcerated hernia through a 5-mm laparoscopic wound. The patient underwent laparoscopic Nissen fundoplication for gastroesophageal reflux. On day 6, she showed symptoms of ileus, and the diagnosis of a trocar wound hernia was made on day 13. The herniated intestine was reduced and the defective peritoneum and fascia were closed under relaparoscopic guidance, thus avoiding full-scale laparotomy. A trocar wound hernia causing early postoperative bowel obstruction is a rare complication, especially at 5-mm trocar puncture sites. Intraoperative dislodgment and reinsertion of working trocars may create fascial defects larger than the actual size of the trocar. All laparoscopic puncture wounds, even those <10 mm in size, should be closed at the fascial level in infants. Revision laparoscopy is considered preferable to manage trocar site complications in children.

Female↗

Determinants of glutamine dependence and utilization by normal and tumor-derived breast cell lines.

A continual supply of the amino acid glutamine (GLN) may be necessary for cancerous cell growth. GLN plays a central role in multiple metabolic pathways and has long been considered an essential component of tissue culture media. However, the GLN requirements of tumor cell lines and the factors that determine a cell's need for GLN have not been comprehensively studied. Also, it remains unclear how various metabolic pathways contribute to GLN consumption. In the present study, possible determinants of GLN metabolism were examined in seven breast cell lines, two derived from immortalized normal tissue and five of tumor origin. These cells exhibited different dependencies on media GLN concentration for growth and a wide range of GLN utilization rates. GLN uptake was facilitated by a single, common transporter functionally defined as System ASC. However, the affinities for GLN exhibited by this transporter differed appreciably between cell lines. Furthermore, the concentration at which media GLN became a limiting factor for cellular proliferation correlated with transporter affinity. The origin of the cell lines was not a determinant of GLN metabolism because immortalized cells of nontumor origin exhibited GLN dependence and utilization rates comparable to those of tumor-derived cells. The rates of CO2 production from GLN were similar for each cell lines. Rates of GLN disappearance and glutamate appearance in media were strongly correlated, with 32-80% of media GLN converted to glutamate. Both rates were directly affected by media cystine concentration, suggesting that a large portion of glutamate efflux was coupled with cystine import through the amino acid transport system x(c)-. These results demonstrated that cell growth is a function of GLN influx and suggest that GLN is used to supply glutamate and cystine, perhaps for glutathione synthesis.

Biological Transport↗

Characteristics of infantile cases of congenital dilatation of the bile duct.

PURPOSE: This study was performed to clarify whether infants with congenital dilatation of the bile duct (CDBD) have any specific characteristics in comparison with older children. METHODS: Of 153 cases with CDBD treated at our institution between 1959 and 1997, 34 (22.2%) were infants less than 1 year of age. The control group consisted of 46 children between 1 and 4 years of age. Symptoms, laboratory data, and histological findings were compared between these two groups. RESULTS: As the initial symptoms, abdominal pain was not present in infantile cases, with a significant difference from the older children, and a significantly higher incidence of abdominal mass and acholic stools was noted in infantile cases. Laboratory data of serum aspartate transaminase and amylase level and amylase concentration in the bile of the common bile duct were significantly lower in the infant group than in the older children. The ratio of morphological type of cystic to cylindrical dilatation was 33 to 1 in infants with a significant difference from the control group. CONCLUSION: Infantile cases of CDBD, which mostly have cystic type dilatation, in contrast to older children, are likely to present with abdominal mass. Pancreatitis with abdominal pain related to reflux of pancreatic juice into the biliary duct appears to be uncommon in infantile cases.

Amylases↗

Endoscopic variceal ligation in the management of gastroesophageal varices in postoperative biliary atresia.

BACKGROUND/PURPOSE: Gastroesophageal variceal bleeding is a serious and difficult problem in the long-term management of biliary atresia (BA). Recently, endoscopic approaches have been attempted to manage this problem. The authors have attempted endoscopic variceal ligation (EVL), a less invasive procedure than endoscopic sclerotherapy. METHODS: In the past 5 years, 66 EVL procedures using standard flexible endoscope with a diameter of 9 mm (type p-30, XQ200, or XQ240; Olympus, Tokyo, Japan) were performed in 30 separate sessions on 11 postoperative BA patients. The mean age of the children was 7.8 (range, 3 to 15) years. The EVL device was a small elastic O-ring or a loop ligator. RESULTS: EVL was performed for emergency hemostasis in two patients and prophylaxis for impending rupture in nine with large, blue varices, or with red spots on the variceal surface. During the initial procedure, all varices were ligated successfully, and reduction in size was noted. Of eight patients who were examined 7 to 14 days after treatment, seven (87.5%) had improved. Eight of 11 patients (72.7%) were finally cured or at least had improved after one to seven sessions of EVL. However, three patients did not show improvement after four to seven sessions because of the reappearance of the varices, development of distal lesions such as gastric varices, and acute gastric mucosal lesions. A technical complication encountered was a slippage of the O-ring in one patient. A technical difficulty was seen in ligating the giant gastric varix in one patient. There was no deterioration of liver function induced by EVL in this entire series. CONCLUSIONS: EVL is an effective and feasible treatment of gastroesophageal varices in postoperative BA patients. However, reappearance or reactivation of the varices or emergence of the more distal lesions is likely to occur even after repeated EVL.

Adolescent↗

Zinc deficiency enhances interleukin-1alpha-induced metallothionein-1 expression in rats.

This study investigated whether interleukin-1alpha-induced metallothionein gene expression is affected by zinc deficiency. Weaning male rats were fed a zinc-deficient (ZD) diet (2 mg zinc/kg) or a zinc-supplemented diet [50.8 mg zinc/kg; controls for the diet included pair-fed (PF) and ad libitum consumption groups (AL)] for 4 wk. All rats except those that served as controls for interleukin-1alpha administration, (injected with vehicle and killed at 0 h) were then injected subcutaneously with interleukin-1alpha (2 x 10(7) units/kg body wt) and killed at 3, 6, 12, 24 and 72 h after the injection. Compared with AL and/or PF rats, zinc depletion significantly reduced zinc concentrations in plasma and liver but not in kidney or intestine, and significantly reduced hepatic, renal, and intestinal metallothionein-1 mRNA levels analyzed by competitive reverse transcription-polymerase chain reaction (RT-PCR). Interleukin-1alpha injection reduced plasma zinc concentration and enhanced liver zinc concentration, but did not affect zinc levels in kidney or intestine. Metallothionein-1 mRNA was significantly elevated by interleukin-1alpha in liver, kidney and intestine of all groups; the levels in liver and kidney of ZD rats 6 h after the injection were significantly higher than those of AL or PF rats. Liver metallothionein protein levels were enhanced after interleukin-1alpha injection in both AL and ZD rats. Semiquantitative RT-PCR revealed significantly higher hepatic levels of interleukin-1 receptor type-I mRNA in ZD rats than in AL and PF rats but no differences in renal or intestinal tissues among groups before interleukin-1alpha challenge. In conclusion, zinc deficiency induces upregulation of metallothionein-1 gene expression in response to interleukin-1alpha challenge in rats.

Animals↗

Characterization of glutamine and glutamate transport in rat lung plasma membrane vesicles.

Insufficient glutamine for the lungs during sepsis may contribute to an impairment in lung function. Lung glutamine metabolism is supported by both blood glutamine uptake and de novo biosynthesis using circulating glutamate as a precursor. Information regarding the specific plasma membrane carriers involved in this uptake is lacking. Furthermore, the effect of sepsis on amino acid transport in whole lung has not been studied. We isolated lung plasma membrane vesicles (LPMVs) from control and LPS-treated rats and assayed glutamine and glutamate transport activity in LPMVs. Vesicle purity and functionality were confirmed by time-dependent concentrative amino acid uptake in the presence of Na+, impoverishment of microsomal enzymes, and a 25-fold enrichment in the plasma membrane marker 5'-nucleotidase. Eighty percent of glutamine uptake in lung vesicles was mediated via the high affinity Na(+)-dependent carrier System ASC (Vmax = 80 +/- 10 pmole/mg protein/15 sec; Km = 224 +/- 30 microM) while 19% occurred via the Na(+)-independent System ASC (Vmax = 11 +/- 2 pmole/mg/15 sec; Km = 141 +/- 23 microM). Ninety percent of glutamate transport was mediated by the Na(+)-independent System XAG-. Treatment of rats with LPS resulted in a decrease in both glutamine and glutamate transport in LPMVs. LPMVs offer a novel method for characterizing lung amino acid transport and studying the effects of catabolic states on this activity. The effects of endotoxin on System ASC and XAG- activity may contribute to reduced lung glutamine availability during septic states which may impair cellular metabolism and function.

5'-Nucleotidase↗

Expression of endothelial constitutive nitric oxide synthase mRNA in gastrointestinal mucosa and its downregulation by endotoxin.

Endothelial nitric oxide exerts local vasodilatory actions in the gastrointestinal (GI) microvasculature and is proposed to play a role in enteric vasomotor regulation. The aims of this study were to characterize the tissue distribution of mRNA for endothelial nitric oxide synthase (NOS-III) and to examine its response to endotoxin challenge in vivo. We demonstrate the expression of NOS-III mRNA and protein in mucosa throughout the gastrointestinal tract and show for the first time that NOS-III mRNA expression in the GI mucosa was down-regulated in the rats treated with endotoxin. The ubiquitous expression of NOS-III mRNA in digestive tissues is consistent with the proposed role of NOS-III in the physiology of the gastrointestinal tract. The decreased NOS-III mRNA, in parallel to induction of inducible NOS (NOS-II) mRNA, may contribute to the impaired endothelium-dependent relaxation and damaged mucosal integrity during sepsis.

Animals↗