Polymorphisms in Kallikrein7 and 10 genes and oral cancer risks in Taiwan betel quid chewers and smokers

OBJECTIVES

We investigated the association between mRNA levels, polymorphisms of Kallikrein7 (KLK7) and Kallikrein10 (KLK10), and the development of oral squamous cell carcinoma (OSCC).

MATERIALS AND METHODS

We recruited 217 OSCC patients and 138 healthy controls. All were men, betel quid chewers, cigarette smokers, and Minnan ethnicity. Genotyping was performed using a TaqMan probe genotyping assay. Gene expression levels were determined using real-time polymerase chain reactions (PCRs) for 20 pairs of cancerous and non-cancerous tissues.

RESULTS

Kallikrein10 rs3745535G>T polymorphisms were significantly associated with OSCC development [adjusted OR (AOR) = 1.62, 95% CI = 1.02-2.59], but KLK7 polymorphisms were not. The KLK7 rs10581213(wt/ins + ins/ins) genotypes were significantly associated with early-stage cancer (AOR = 0.34, 95% CI = 0.14-0.78), but KLK10 polymorphisms were not. Relative expression analysis indicated that an increase in KLK7 and KLK10 mRNA levels was found in cancerous tissues (2(-ΔΔCT) = 25.23 ± 8.85 and 10.89 ± 4.97, respectively). A significantly higher level of KLK7 was expressed in early-stage cancer with the rs10581213(wt/ins + ins/ins) genotypes, but there was no significant difference in the mRNA levels of KLK7 and KLK10 between early- and advanced-stage cancers.

CONCLUSIONS

This is the first correlation of OSCC with KLK10 rs3745535G>T polymorphisms. Early-stage OSCC and high KLK7 mRNA levels were correlated with the rs10581213(wt/ins + ins/ins) genotypes. More studies with large sample sizes are needed to verify our findings.

Effects of the dietary phytoestrogen biochanin A on cell growth in the mammary carcinoma cell line MCF-7

Studies of the dietary phytoestrogen biochanin A on cell proliferation of the cultured estrogen responsive cells human breast carcinoma MCF-7 showed that biochanin A exhibits biphasic regulation on MCF-7 cells. At concentrations of less than 10 microg/mL, cells respond to biochanin A by increasing cell growth and de novo DNA synthesis. The addition of biochanin A at concentrations of greater than 30 microg/mL significantly inhibited cell growth and DNA synthesis in a dose-dependent fashion, resulting in an IC(50) value of 40 microg/mL. The reversibility of these inhibitory effects by biochanin A appears also to be concentration dependent. Cells previously treated with high concentrations (>60 microg/mL) of biochanin A did not regain normal growth after treatment ceased. Biochanin A was cytostatic at low concentrations (<40 microg/mL) and cytotoxic at higher concentrations. Upon exposure to 100 microg/mL of biochanin A, cell morphology was severely altered, cell volume decreased, and condensation of cell components was clearly noticeable. In addition, biochanin A damaged cell membranes by increasing membrane permeability. These results suggest possible molecular and cellular mechanisms of the action of dietary phytoestrogens on estrogen target cells.

Multiple unfolding intermediates of human placental alkaline phosphatase in equilibrium urea denaturation

Alkaline phosphatase is an enzyme with a typical alpha/beta hydrolase fold. The conformational stability of the human placental alkaline phosphatase was examined with the chemical denaturant urea. The red shifts of fluorescence spectra show a complex unfolding process involving multiple equilibrium intermediates indicating differential stability of the subdomains of the enzyme. None of these unfolding intermediates were observed in the presence of 83 mM NaCl, indicating the importance of ionic interactions in the stabilization of the unfolding intermediates. Guanidinium chloride, on the other hand, could stabilize one of the unfolding intermediates, which is not a salt effect. Some of the unfolding intermediates were also observed in circular dichroism spectroscopy, which clearly indicates steady loss of helical structure during unfolding, but very little change was observed for the beta strand content until the late stage of the unfolding process. The enzyme does not lose its phosphate-binding ability after substantial tertiary structure changes, suggesting that the substrate-binding region is more resistant to chemical denaturant than the other structural domains. Global analysis of the fluorescence spectral change demonstrated the following folding-unfolding process of the enzyme: N <--> I(1) <--> I(2) <--> I(3) <--> I(4) <--> I(5) <--> D. These discrete intermediates are stable at urea concentrations of 2.6, 4.1, 4.7, 5.5, 6.6, and 7.7 M, respectively. These intermediates are further characterized by acrylamide and/or potassium iodide quenching of the intrinsic fluorescence of the enzyme and by the hydrophobic probes, 1-anilinonaphthalene-8-sulfonic acid and 4,4'-dianilino-1,1'-binaphthyl-5,5'-disulfonic acid. The stepwise unfolding process was interpreted by the folding energy landscape in terms of the unique structure of the enzyme. The rigid central beta-strand domain is surrounded by the peripheral alpha-helical and coil structures, which are marginally stable toward a chemical denaturant.

Differentiation of the slow-binding mechanism for magnesium ion activation and zinc ion inhibition of human placental alkaline phosphatase

The binding mechanism of Mg(2+) at the M3 site of human placental alkaline phosphatase was found to be a slow-binding process with a low binding affinity (K(Mg(app.)) = 3.32 mM). Quenching of the intrinsic fluorescence of the Mg(2+)-free and Mg(2+)-containing enzymes by acrylamide showed almost identical dynamic quenching constant (K(sv) = 4.44 +/- 0.09 M(-1)), indicating that there is no gross conformational difference between the M3-free and the M3-Mg(2+) enzymes. However, Zn(2+) was found to have a high affinity with the M3 site (K(Zn(app.)) = 0.11 mM) and was observed as a time-dependent inhibitor of the enzyme. The dependence of the observed transition rate from higher activity to lower activity (k(obs)) at different zinc concentrations resulted in a hyperbolic curve suggesting that zinc ion induces a slow conformational change of the enzyme, which locks the enzyme in a conformation (M3'-Zn) having an extremely high affinity for the Zn(2+) (K*(Zn(app.)) = 0.33 microM). The conformation of the M3'-Zn enzyme, however, is unfavorable for the catalysis by the enzyme. Both Mg(2+) activation and Zn(2+) inhibition of the enzyme are reversible processes. Structural information indicates that the M3 site, which is octahedrally coordinated to Mg(2+), has been converted to a distorted tetrahedral coordination when zinc ion substitutes for magnesium ion at the M3 site. This conformation of the enzyme has a small dynamic quenching constant for acrylamide (K(sv) = 3.86 +/- 0.04 M(-1)), suggesting a conformational change. Both Mg(2+) and phosphate prevent the enzyme from reaching this inactive structure. GTP plays an important role in reactivating the Zn-inhibited enzyme activity. We propose that, under physiological conditions, magnesium ion may play an important modulatory role in the cell for protecting the enzyme by retaining a favorable geometry of the active site needed for catalysis.

Slow binding of metal ions to pigeon liver malic enzyme: a general case

Pigeon liver malic enzyme was inhibited by lutetium ion through a slow-binding process, which resulted in a concave down tracing of the enzyme activity assay. The fast initial rates were independent of lutetium ion concentration, while the slow steady-state rates decreased with increasing Lu(3+) concentration. The observed rate constant for the transition from initial rate to steady-state rate, k(obs), exhibited saturation kinetics as a function of Lu(3+) concentration, suggesting the involvement of an isomerization process between two enzyme forms (R-form and T-form). The binding affinity of Lu(3+) to the R-form is weaker (K(d,Lu) = 14 microM) than that of Mn(2+) (K(m,Mn) = 1.89 microM); however, Lu(3+) has much tighter binding affinity with the T-form ( = 0.83 microM). Lu(3+) was shown to be a competitive inhibitor with respect to Mn(2+), which suggests that Lu(3+) and Mn(2+) are competing for the same metal binding site of the enzyme. These observations are in accordance with the available crystal structure information, which shows a distorted active site region of the Lu(3+)-containing enzyme. Other divalent cations, i.e., Fe(2+), Cu(2+), or Zn(2+), also act as time-dependent slow inhibitors for malic enzyme. The dynamic quenching constants of the intrinsic fluorescence for the metal-free and Lu(3+)-containing enzymes are quite different, indicating the conformational differences between the two enzyme forms. The secondary structure of these two enzyme forms, on the other hand, was not changed. The above results indicated that replacement of the catalytically essential Mn(2+) by other metal ions leads to a slow conformational change of the enzyme and consequently alters the geometry of the active site. The transformed enzyme conformation, however, is unfavorable for catalysis. Both the chemical nature of the metal ion and its correct coordination in the active site are essential for catalysis.

Potent and competitive inhibition of malic enzymes by lanthanide ions

The catalytic activity of malic enzyme (ME), a member of a new class of oxidative decarboxylases, requires the presence of divalent cations (Mn(2+), Mg(2+), and others). The crystal structure at 2.9 A resolution of human mitochondrial NAD(+)-dependent malic enzyme in a ternary complex with NAD(+) and the lanthanide ion Lu(3+), which has similar radius as Mn(2+), reveals a new conformation of the enzyme. The active site in this ternary complex is in an open form, while the organization of the tetramer of the enzyme actually resembles that with a closed active site. The Lu(3+) ion is bound to the enzyme at the same site as Mn(2+). Kinetic studies showed that Lu(3+) is a potent inhibitor of both the human NAD(P)(+)-dependent ME and the NADP(+)-dependent ME from pigeon liver, and is competitive with respect to the divalent cation, consistent with the structural information.

Reverse micelles as life-mimicking systems

In this review, we attempt to demonstrate that reverse micelles are simple artificial systems that mimic many life systems from cell division to the creation of an enzyme catalytic mechanism. For a membranous enzyme like placental alkaline phosphatase, the kinetic properties observed in reverse micelles might represent those found under physiological conditions. The reverse micellar system, consisting of a positively charged surfactant, mimics a detoxification enzyme glutathione transferase. We propose a novel island-in-oil-lake reverse micellar model for the glutathione transferase that can account for almost all the catalytic properties of this enzyme. Reverse micelles may provide an excellent model system in investigating the reaction mechanism of other detoxification enzymes.

Successful initial treatment with weekly etoposide, epirubicin, cisplatin, 5-fluorouracil and leucovorin chemotherapy in advanced gastric cancer patients with disseminated intravascular coagulation

BACKGROUND

Acute disseminated intravascular coagulation (DIC) is a rare but severe complication of gastric adenocarcinoma. Conventional treatments, such as fresh frozen plasma, platelet replacement and heparin injections, are disappointing. The only way to correct this fatal condition is to control the underlying cancer promptly by effective chemotherapy. Here the successful initial control of acute DIC in gastric cancer patients with weekly EEPFL chemotherapy is reported.

METHODS

Advanced gastric cancer patients complicated with acute DIC were eligible. Patients were treated with weekly EEPFL therapy (etoposide 40, epirubicin 10, cisplatin 25, 5-fluorouracil 2200 and leucovorin 120 mg/m2 ). Response, survival and toxicity were evaluated.

RESULTS

From April 1997 to April 1999, six patients were included in this study. All patients received EEPFL chemotherapy. Clinical and laboratory evidence of acute DIC stabilized quickly after starting chemotherapy. Four patients showed a partial response, one stable disease and one progressive disease. The toxicity was mild and well tolerated. Median survival was 28 weeks (12, 14, 26, 30, 30 and 32 weeks). All patients suffered from a relapse of DIC after initial successful control and died within 30 days of clinical and laboratory evidence of acute DIC relapse.

CONCLUSION

EEPFL therapy is an effective chemotherapy regimen for patients with advanced gastric cancer associated with acute DIC. The prognosis is poor if the DIC relapses after the initial successful control.

Proximal arterioportal shunting associated with hepatocellular carcinoma: features revealed by dynamic helical CT

OBJECTIVE

This study investigated the findings revealed by dynamic helical CT of proximal arterioportal shunting associated with hepatocellular carcinoma. We also evaluated the diagnostic capability of this imaging technique to reveal the mass in patients with hepatocellular carcinoma.

CONCLUSION

On dynamic helical CT, proximal arterioportal shunting altered liver perfusion and tumor enhancement. Heterogeneous enhancement of liver parenchyma and decreased enhancement of hepatomas diminished diagnostic capability on the arterial dominant phase image. However, with the addition of imaging in the arterial portal phase, lesion conspicuity improved.

Klebsiella pneumoniae panophthalmitis: a possible complication of endoscopic variceal injection sclerotherapy

Complication of endoscopic variceal injection sclerotherapy for esophageal variceal hemorrhage is not unusual. However, sclerotherapy complicated panophthalmitis was never reported before. We report such an unusual complication and discuss its possible mechanism and treatment.

Radiotherapy in the treatment of duodenal bleeding due to hepatocellular carcinoma invasion

Haemorrhage from an hepatocellular carcinoma (HCC) directly invading the gastrointestinal (GI) tract is uncommon. A 58-year-old man was admitted with upper gastrointestinal (UGI) bleeding and panendoscopy on examination revealed a large duodenal ulcerative bleeding mass. The mass was eventually diagnosed as HCC by pathological examination. The bleeding failed to respond to conventional management of haemostasis, but resolved with an external beam of radiotherapy with a total dose of 6000 cGy over a 5 week period. This unusual presentation of UGI bleeding, due to HCC invading the duodenum and treated by radiotherapy, has not been previously reported.

Biphasic denaturation of human placental alkaline phosphatase in guanidinium chloride

Human placental alkaline phosphatase is a membrane-anchored dimeric protein. Unfolding of the enzyme by guanidinium chloride (GdmCl) caused a decrease of the fluorescence intensity and a large red-shifting of the protein fluorescence maximum wavelength from 332 to 346 nm. The fluorescence changes were completely reversible upon dilution. GdmCl induced a clear biphasic fluorescence spectrum change, suggesting that a three-state unfolding mechanism with an intermediate state was involved in the denaturation process. The half unfolding GdmCl concentrations, [GdmCl]0.5, corresponding to the two phases were 1.45 M and 2.50 M, respectively. NaCl did not cause the same effect as GdmCl, indicating that the GdmCl-induced biphasic denaturation is not a salt effect. The decrease in fluorescence intensity was monophasic, corresponding to the first phase of the denaturation process with [GdmCl]0.5 = 1.37 M and reached a minimum at 1.5 M GdmCl, where the enzyme remained completely active. The enzymatic activity lost started at 2.0 M GdmCl and was monophasic but coincided with the second-phase denaturation with [GdmCl]0.5 = 2.46 M. Inorganic phosphate provides substantial protection of the enzyme against GdmCl inactivation. Determining the molecular weight by sucrose-density gradient ultracentrifugation revealed that the enzyme gradually dissociates in both phases. Complete dissociation occurred at [GdmCl] > 3 M. The dissociated monomers reassociated to dimers after dilution of the GdmCl concentration. Refolding kinetics for the first-phase denaturation is first-order but not second-order. The biphasic phenomenon thereby was a mixed dissociation-denaturation process. A completely folded monomer never existed during the GdmCl denaturation. The biphasic denaturation curve thereby clearly demonstrates an enzymatically fully active intermediate state, which could represent an active-site structure intact and other structure domains partially melted intermediate state.

Solvent kinetic isotope effects of human placental alkaline phosphatase in reverse micelles

Human placental alkaline phosphatase was embedded in a reverse micellar system prepared by dissolving the surfactant sodium bis(2-ethylhexyl) sulphosuccinate (Aerosol-OT) in 2,2, 4-trimethylpentane. This microemulsion system provides a convenient instrumental tool to study the possible kinetic properties of the membranous enzyme in an immobilized form. The pL (pH/p2H) dependence of hydrolysis of 4-nitrophenyl phosphate has been examined over a pL range of 8.5-12.5 in both aqueous and reverse micellar systems. Profiles of log V versus pL were Ha-bell shaped in the acidic region but reached a plateau in the basic region in which two pKa values of 9.01-9.71 and 9.86-10.48, respectively, were observed in reverse micelles. However, only one pKa value of 9.78-10.27 in aqueous solution was detected. Profiles of log V/K versus pL were bell-shaped in the acidic region. However, they were wave-shaped in the basic region in which a residue of pKa 9.10-9.44 in aqueous solution and 8.07-8.78 in reverse micelles must be dehydronated for the reaction to reach an optimum. The V/K value shifted to a lower value upon dehydronation of a pKa value of 9.80-10.62 in aqueous solution and 11.23-12.17 in reverse micelles. Solvent kinetic isotope effects were measured at three pL values. At pL 9.5, the observed isotope effect was a product of equilibrium isotope effect and a kinetic isotope effect; at pL 10.4, the log V/K value was identical in water and deuterium. The deuterium kinetic isotope effect on V/K was 1.14 in an aqueous solution and 1.16 in reverse micelles. At pL 11.0 at which the log V values reached a plateau in either solvent system, the deuterium kinetic isotope effect on V was 2.08 in an aqueous solution and 0.62 in reverse micelles. Results from a proton inventory experiment suggested that a hydron transfer step is involved in the transition state of the catalytic reaction. The isotopic fractionation factor (pi) for deuterium for the transition state (piT) increased when the pH of the solution was raised. At pL 11.0, the piT was 1.07 in reverse micelles, which corresponds to the inverse-isotope effect of the reaction in this solvent system. Normal viscosity effects on kcat and kcat/Km were observed in aqueous solution, corresponding to a diffusional controlled physical step as the rate-limiting step. We propose that the rate-limiting step of the hydrolytic reaction changes from phosphate releasing in aqueous solution to a covalent phosphorylation or dephosphorylation step in reverse micelles.

Inhibitory effect of magnesium ion on the human placental alkaline phosphatase-catalyzed reaction in a reverse micellar system

Human placental alkaline phosphatase is a membrane-anchored protein. Entrapping the enzyme into a reverse micellar vesicle mimics the in vivo conditions and allows examination of the properties of the enzyme. Placental alkaline phosphatase is enzymatically active in Aerosol-OT/isooctane reverse micelles. Substantially different kinetic behavior of the enzyme has been observed in aqueous or reverse micellar systems. In aqueous solution, Mg2+ is a nonessential activator of the enzyme. In the experiments described in the present report Mg2+ was found to be an inhibitor for the enzyme in reverse micelles. This inhibition is presumably due to a time-dependent conformational change of the enzyme molecule, which resulted in a curvature in the recorder tracings of the enzyme assays. The Mg2+-induced conformational change of the enzyme was completely prevented by phosphate and partially reserved by EDTA. High concentrations of Zn2+ also strongly inhibited enzyme activity in both aqueous and reverse micellar solvent systems, presumably by occupying the Mg2+ (M3) site of the enzyme. However, binding of Zn2+ at the M3 site did not cause conformational change of the enzyme and the enzyme assay tracing was linear. The M3 site of the enzyme is proposed to have a modulatory role in vivo using magnesium ion as the modulator.

MPTP produces differential oxidative stress and antioxidative responses in the nigrostriatal and mesolimbic dopaminergic pathways

1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) is known to produce a differential toxicity in the nigrostriatal and mesolimbic dopaminergic pathways with the nigrostriatal pathway being more vulnerable. We, therefore, investigated whether oxidative stress and the antioxidant system play a role in this phenomenon. Balb/c mice were treated with either saline or MPTP (30 mg/kg/d) for 7 d, and were sacrificed on the next day. Results revealed that MPTP increased lipid peroxidation in the striatum (ST) and decreased glutathione concentration in the substantia nigra (SN) without markedly affecting these measures in the nucleus accumbens (NAc) and ventral tegmental area (VTA). Further, MPTP produced approximately twofold increases in both manganese superoxide dismutase (MnSOD) and copper-zinc superoxide dismutase (CuZnSOD) activities in the VTA while it only increased MnSOD activity in the SN. Both catalase and glutathione peroxidase (GPx) activities were not markedly altered by MPTP in both systems. However, the basal levels of catalase and GPx activities were higher in the VTA and NAc than in the SN and ST. These results together suggest that a lesser degree of oxidative damage and a more inducible CuZnSOD activity observed in the mesolimbic dopaminergic pathway may partially explain the differential toxicity MPTP produced in these two dopaminergic systems.

Genetic polymorphisms of CYP2E1, GSTM1, and GSTT1; environmental factors and risk of oral cancer

Both genetic and environmental factors are involved in the development of cancer; some phase I and II enzymes involved in the metabolism of carcinogens are polymorphic in genotypes. This case-control study focused on the interactions between oral cancer risk factors and genetic polymorphisms of cytochrome P-450 (CYP) 2E1 and glutathione S-transferase (GST) M1 and GSTT1. A total of 41 male oral cancer cases was recruited from National Taiwan University Hospital, and 123 healthy controls frequency-matched on ethnicity, sex, and age were recruited from residents living in Taipei City and Taipei County. History of cigarette smoking, alcohol drinking, and betel quid chewing was obtained through a standardized questionnaire interview, and genotypes of CYP2E1, GSTM1, and GSTT1 were determined by PCR. Cigarette smoking, alcohol drinking, and betel quid chewing were significantly associated with the risk of oral cancer in a dose-response relationship. All betel quid chewers smoked cigarettes in both the case and control groups. In the multiple logistic regression analysis, those who had null genotypes of GSTM1 and/or GSTT1 had an increased oral cancer risk compared with those who had non-null genotypes of both GSTM1 and GSTT1, showing a multivariate-adjusted odds ratio (OR) of 4.6 with a 95% confidence interval (CI) of 0.9-23.7 (P = 0.08). The CYP2E1 c1/c2 and c2/c2 genotypes were associated with a significantly increased oral cancer risk compared with the c1/c1 genotype among those who did not chew betel quid (OR, 4.7; 95% CI, 1.1-20.2), but not among betel quid chewers. Habitual alcohol drinking was associated with a significantly increased oral cancer risk, showing an OR of 3.0 (95% CI, 1.1-8.8). These results implied that there are gene-gene and gene-environment interactions in the development of oral cancer.

The mesolimbic dopaminergic pathway is more resistant than the nigrostriatal dopaminergic pathway to MPTP and MPP+ toxicity: role of BDNF gene expression

In the present study we examined the role of BDNF gene expression involved in the differential vulnerability of the nigrostriatal and mesolimbic dopaminergic pathways to environmental damage. The toxins for dopamine (DA) neurons 1-methyl-4-phenyl-1,2,3,6,-tetrahydropyridine (MPTP) and 1-methyl-4-phenylpyridinium (MPP+) were used as pharmacological tools. Results revealed that chronic MPTP treatment produced a significant and irreversible DA depletion in the striatum (ST) as well as a marked decrease in tyrosine-hydroxylase (TH) mRNA level in the substantia nigra (SN). Under these conditions, the endogenous brain-derived neurotrophic factor (BDNF) mRNA level was increased in the SN. Only acute DA reduction was found in the nucleus accumbens (NAc) and TH mRNA level was not affected in the ventral tegmental area (VTA) by MPTP treatment. Further, when MPP+ produced a similar extent of DA depletion in the ST and NAc, the TH mRNA level was also decreased while BDNF mRNA level was increased in the SN. The same alterations were not observed in the VTA. Results from the BDNF mRNA regional distribution study revealed that structures in the mesolimbic dopaminergic pathway expressed a more than 2-fold higher basal BDNF mRNA level than structures in the nigrostriatal dopaminergic pathway. Presumably, enhanced BDNF gene expression would help the survival of DA neurons and these findings suggest a better protective mechanism in the mesolimbic pathway. Lastly, direct BDNF infusions to the SN partially protected against MPTP's toxicity on DA neurons in the ST in mice. These results together suggest that a more abundant BDNF mRNA level along the mesolimbic pathway than the nigrostriatal pathway may, at least partially, explain the differential vulnerability of different DA neurons to MPTP and MPP+ toxicity.

1-Methyl-4-phenyl-pyridinium (MPP+) uptake does not explain the differential toxicity of MPP+ in the nigrostriatal and mesolimbic dopaminergic pathways

The present study examined the possible differential toxicity of 1-methyl-4-phenyl-pyridinium (MPP+) in the nigrostriatal and mesolimbic dopaminergic pathways in BALB/c mice, and investigated whether MPP+ uptake may account for this differential toxicity. Results indicated that chronic MPP+ infusions to the striatum (ST) and nucleus accumbens (NAc) both produced a toxicity on dopamine (DA) neurons. However, MPP+ produced a more severe DA depletion in the ST than in the NAc. Kinetic analyses from MPP+ uptake studies revealed a similar Km value in both the ST and NAc, suggesting that the affinity for MPP+ uptake is not different. The Vmax was approximately 1.6-fold higher in the ST than in the NAc. These results together suggest that chronic MPP+ infusions produce a differential toxicity on DA neurons in the nigrostriatal and mesolimbic dopaminergic pathways and that the ability of MPP+ uptake in DA terminals probably does not account for this differential toxicity.

Gastrointestinal bleeding due to whipworm (Trichuris trichiura) infestation: a case report

Severe whipworm infestation, an exceedingly uncommon cause of gastrointestinal bleeding, has not been reported in Taiwan. The reported case concerns a 59-year-old female who had suffered from abdominal pain and passage of tarry stool for several days. Esophagogastroduodenoscopy was performed, and several roundworms were seen in the second portion of duodenum. After removal, the characteristic appearance of Trichuris trichiura was apparent. After exploratory laparotomy for intractable bloody stool, the result of operative findings and pathological reports also confirmed our diagnosis. This is a case presented of massive gastrointestinal bleeding in which the cause of bleeding was diagnosed before operation to be whipworm infestation by endoscopic examination. The clinical and pathologic characteristics of the trichuriasis are described, with a brief review and discussion.

Protein synthesis in the hippocampus associated with memory facilitation by corticotropin-releasing factor in rats

The present study used pharmacological, biochemical, and behavioral methods to examine the role of protein synthesis in the hippocampus in memory processes of a passive avoidance learning in rats. Results indicated that corticotropin-releasing factor (CRF) significantly improved memory retention in rats. Both cycloheximide (CHX) and actinomycin-D (ACT-D) impaired memory at high doses. At doses of CHX and ACT-D that did not affect memory alone, they both antagonized the memory-enhancing effect of CRF. Biochemically, there were specific increases in the optical density of three protein bands in the cytosolic fraction of hippocampal cells in rats showing good memory. There were also marked increases in the optical density of two protein bands in the nucleus fraction of the same animals. Similar results were observed in animals injected with CRF. However, no significant protein alteration was observed in animals receiving stress. These results together suggest that there are new protein syntheses in the hippocampus that are specifically associated with passive avoidance learning in rats.

CRF increases protein phosphorylation and enhances retention performance in rats

This study examines the roles of PKC and protein phosphorylation in the retention performance of a passive avoidance learning (PAL) task in rats. Results revealed that H7 injected into the dentate gyrus (DG) of the hippocampus impaired retention in a dose-dependent manner. Corticotropin-releasing factor (CRF) injected into the DG improved retention and this facilitation was antagonized by H7 pretreatment. CRF increased phosphorylation of five proteins, whereas H7 decreased phosphorylation in three of these proteins in both the cytosol and the membrane fractions of hippocampus. These effects were shown not to be associated with stress. These results demonstrate that CRF increased protein phosphorylation associated with enhanced retention of PAL task in rats.

The reversible behavior of locally invasive endometrial carcinoma in a chromosomally mosaic (45,X/46,Xr(X)) young woman treated with Clomid

A 22 year-old phenotypic female with a 45,x/46,x, r(x) mosaic complement had anovulatory cycles, histologically normal ovaries, and atypical endometrial hyperplasia which, when clinically followed by repeated biopsies, was found to progress to locally invasive endometrial carcinoma. This was successfully managed by the induction of ovulation with Clomid, which resulted in conversion of the endometrium to a normal secretory pattern for two subsequent years.

Plasma estrogen in patients with endometrial hyperplasia and carcinoma

In a total of 53 patients, most of whom were over 40 years of age and who presented symptoms of vaginal bleeding, total plasma estrogens were measured with gas liquid chromatography, and the clinical correlates were studied. The results revealed that total plasma estrogen levels in the endometrial hyperplasia and endometrial carcinoma groups were significantly higher than those measured in the control group. In addition, a positive, significant correlation was found between the plasma estrogen levels and obesity in the patients with endometrial carcinoma. The study provides objective data that document the clinical impressions that hyperestrogenism and obesity are significant findings in endometrial carcinoma.

The effect of prostaglandin F2alpha on the placental progesterone level in midtrimester abortion

A gas chromatograph method has been used for the determination of placental progesterone levels in 14 patients aborted at midtrimester by intra-amniotic instillation of prostaglandin F1alpha, also from a control group (five patients) aborted surgically by dilatation and suction. The results showed that the mean %/- S.E. of placental progesterone in the prostaglandin group was 1.45 mug +/- 0.09 per 1 Gm. of placental tissue, whereas the mean +/- S.E. of the placental progesterone in the surgically aborted group was 5.22 +/- 0.31 mug per 1 Gm. of placental tissue. The difference between the two groups was significant: P EQUALS 0.0001. This low level of placental progesterone in the prostaglandin abortion group could explain the sharp decline of the progesterone levels in the peripheral blood during abortion by intra-amniotic instillation of prostaglandin F2alpha, as observed by our group1, 2 and others.3(-5)