Factors related to post-liver transplantation acute renal failure

Acute renal failure (ARF) after liver transplantation (OLT) is a common complication with severe impact on early and late prognosis of recipients. Factors predicting its incidence have not been fully identified due to the lack of a universal standard as well as the variance of data between transplant centers. To identify factors related to post-OLT ARF, we retrospectively collected materials on 89 patients, who underwent OLT from 1999 to 2001 in our center. Factors associated with post-OLT ARF were identified using univariate logistic regression. Significant factors were then entered into a multivariate logistic regression to identify factors independently associated with post-OLT ARF. Upon univariate analysis, intraoperative volume of blood transfusion (P = .041) and duration of operation (P = .005) were significant. ARF was associated with a poor prognosis (P < .001). Only duration of operation (P = .026) was an independent factor predicting the development of ARF. In conclusion, intraoperative volume of blood transfusion and duration of operation were factors contributing to post-OLT ARF in which the duration of the operation was an independent risk factor. The incidence of post-OLT ARF greatly increased recipient mortality in the early postoperative period.

A fiber-optic powered wireless sensor module made on elastomeric substrate for wearable sensors

We demonstrate an integrated sensor module that combines a photonic nano-porous sensor and a bias-free optical powered RF transducer. The sensor signal is encoded in the RF frequency ready for transmission. The entire sensor module does not include battery and is constructed with the flexible and biocompatible elastomeric polymer, PDMS. This technology holds promise for wearable sensors.

Identification of Lenke spine deformity classification by simplified 3D spine model

The 3D Bezier Curve is used to model the simplified 3D human spine for analyzing and classifying the scoliotic deformity. This 3D spine model is based on two orthogonal spinal radiographic images taken from coronal and sagittal planes. Superimposed on these two images, the 3D Bezier curves are fitted interactively onto the center of the spine from coronal and sagittal images. After the 3D Bezier Curve fitting, a series of simplified 3D vertebrae are implemented onto the 3D Bezier Curve proportional in size to its axis. The Lenke Classification system is applied to this 3D spine model. In order to identify the Lenke Classification for each individual spine model, the left side bending and right side bending images are added. Bending the 3D spine model interactively to the left and right determines the stiffness of the spinal deformity and whether the curves are structural. Thus the Lenke Classification could be determined.

Altered development and protein metabolism in skeletal muscles of broiler chickens (Gallus gallus domesticus) by corticosterone

Two trials were conducted to investigate the effect of corticosterone (CORT) on protein metabolism and the amino acid composition in muscle tissues of broiler chickens (Gallus gallus domesticus). In Trial 1, two groups of 30 broiler chickens were subjected to control or CORT treatment (30 mg/kg diet) from 28 to 39 days of age. In Trial 2, three groups of chickens of 28 days of age were randomly subjected to one of the following treatments for 7 days: CORT (30 mg/kg diet), pair-fed (maintaining the same feed intake as CORT treatment) and control treatments. The body mass gain and feed efficiency was significantly decreased by CORT treatment, while the food intake was decreased. The breast and thigh masses (% body mass) were significantly suppressed by CORT treatment, while the abdominal fat and liver masses (%) were obviously increased. The plasma levels of glucose, urate and total amino acid were significantly elevated by CORT treatment. The capacity for protein synthesis, estimated by RNA:protein ratio, were significantly suppressed by CORT in M. pectoralis major and M. biceps femoris. The 3-methylhistidine concentrations were significantly increased in both M. pectoralis major and M. biceps femoris of CORT chickens, compared to control but not the pair-fed chickens. The amino acid composition of M. pectoralis major and M. biceps femoris was not significantly affected by CORT treatment. In conclusion, the arrested growth in skeletal muscles induced by CORT administration has tissue specificity. The CORT treatment retards the growth of skeletal muscle by suppressed protein synthesis and augmented protein catabolism.

Expression of immune responsive genes in cell lines from two different Anopheline species

Malaria infection results in increased expression of immune responsive genes, including those encoding antimicrobial peptides such as Gambicin (Gam1) and Cecropin A (Cec1). Understanding how these genes are regulated will provide insights how the mosquito immune system is activated by Plasmodium. We previously have shown that Cec1 was primarily regulated by the Imd-Relish (REL2) pathway in the Anopheles gambiae Sua1B cell line. We show here that expression of Defensin A (Def1) and Gam1 was reduced after RNA interference against components of the Imd-REL2 pathway in An. gambiae cell lines. Interestingly, promoter reporters of these antimicrobial peptides were expressed at very low level in the cell line MSQ43 from Anopheles stephensi. Surprisingly, over-expression of either NF-kappaB transcription factor REL1 or REL2 alone is sufficient to induce the expression of Cec1, Gam1 and Def1. These results suggest that expression of these antimicrobial peptides (AMP) in vivo may be regulated by both the Toll and Imd pathways. We also show here for the first time that Tep4, a gene encoding a thioester containing protein, is regulated by REL2. Taken together, these results suggest that there are significant overlaps of genes regulated by the Toll-Rel1 and Imd-Rel2 pathways. Further, the different expression patterns in two different Anopheline cell lines provide a platform to identify other key positive and negative regulators of the antimicrobial peptide genes.

Comparison of clinical outcomes and spectral Doppler indices of uterine and ovarian stromal arteries in women undergoing myomectomy with or without hypogastric arterial ligation

OBJECTIVE

To compare clinical outcomes and hemodynamic alterations of uterine and ovarian stromal arteries between patients with symptomatic myomas undergoing myomectomy preceded by arterial ligation and those undergoing myomectomy alone.

METHODS

In this prospective, non-randomized comparative study, myomectomy was performed on 69 women with symptomatic myomas. Myomectomy alone was performed in 31 patients (Group I) and myomectomy with concomitant bilateral hypogastric arterial ligation was performed in 38 patients (Group II). In both groups, surgical results and clinical outcomes were evaluated by peripheral hemoglobin levels, a pictorial blood-loss assessment chart, and visual analog scales. Spectral Doppler indices of uterine and ovarian stromal arteries, including peak systolic velocity, end-diastolic velocity, pulsatility index and resistance index were performed preoperatively, and 1 day and 1 or more months postoperatively.

RESULTS

Twenty-two patients in Group I and 31 patients in Group II received regular follow-up examinations for a mean follow-up period of 10.1 months. Menstrual flow, dysmenorrhea and hemoglobin levels improved significantly after surgery in both groups. Blood loss during surgery was less in Group II than it was in Group I (P=0.02). Doppler indices of uterine and ovarian stromal arteries from preoperation to mean follow-up point were not significantly different between the groups, except for a significantly lower uterine artery pulsatility index in Group II (P=0.01).

CONCLUSIONS

Myomectomy with hypogastric arterial ligation for symptomatic myomas is as efficient as is myomectomy alone and reduces blood loss during surgery. Serial Doppler studies showed that hypogastric ligation does not block uterine and ovarian perfusion, and even reduces the impedance of the uterine arteries. The long-term recurrence rate after myomectomy with hypogastric arterial ligation remains to be determined.

Structural characterization of enterobactin hydrolase IroE

The proliferation of many pathogenic bacteria is limited by the scarcity of soluble iron in their environment. Many of these bacteria scavenge iron by synthesizing and exporting small molecule siderophores that chelate iron. Iron-bound siderophores are subsequently imported for metabolic processing. Three related serine hydrolases have been characterized biochemically in this pathway: Fes, IroD, and IroE. Here, we report the crystal structure of IroE from uropathogenic Escherichia coli CFT073. The native structure and a complex with diisopropyl fluorophosphonate (DFP, a potent serine hydrolase inhibitor) were determined at 2.3 and 1.4 A resolution, respectively. IroE has the typical alpha/beta-hydrolase fold with an atypical catalytic dyad composed of Ser 189 and His 287. Mutation of either residue was detrimental to catalysis. In addition, rather than the typical oxyanion hole composed of backbone amides, IroE employs the atypical guanidinium moiety of Arg 130. Asp 90 anchors Arg 130 in the active site, and mutation of either residue was likewise detrimental to catalysis. We also compare the structure of IroE to the structure of Fes from Shigella flexneri (PDB entry 2B20). Both enzymes have similar active sites, but Fes has an additional amino-terminal lid domain. These lid domains are proposed to confer specificity to these related hydrolases.

Renoprotective effects of combination of angiotensin converting enzyme inhibitor with mycophenolate mofetil in diabetic rats

OBJECTIVE AND DESIGN

Previously it was shown that blocking of the renin-angiotensin system (RAS) by angiotensin converting enzyme (ACE) inhibitors, or suppression of inflammatory responses by immunosuppressive drugs such as mycophenolate mofetil (MMF) could attenuate renal injury in diabetic rats. Whether RAS blockade combined with an immunosuppressive drug provides superior renoprotection against diabetic nephropathy has not been clearly delineated.

MATERIALS

Diabetes was induced by injection of streptozotocin after uninephrectomy.

TREATMENT

Rats were randomly separated into five groups: control, diabetes, diabetes treated with enalapril (an ACE inhibitor, 10 mg/kg/d by gastric gavage), diabetes treated with MMF (10 mg/kg/d by gastric gavage), or diabetes treated with a combination of both agents and were followed for 8 weeks.

METHODS

24 h urinary albumin excretion rate (AER) was determined, renal injury was evaluated, immunohistochemistry for ED-1 macrophage marker, intercellular adhesion molecule-1 (ICAM-1) and monocyte chemoattractant protein-1 (MCP-1) were performed, and expression of transforming growth factor (TGF)-beta1 protein was determined by Western blotting analysis.

RESULTS

Diabetes was associated with a considerable increase in AER. Both enalapril and MMF retarded the increase in albuminuria, which was nearly completely abrogated by combination therapy. Increased glomerular volume and tubulointerstitial injury index in diabetic rats was attenuated by treatment with either enalapril or MMF and further reduced by the combination of the two. Elevated malondialdehyde levels in renal tissue were reduced by enalapril or MMF and, more effectively, by combined enalapril with MMF. Renal overexpression of ICAM-1 was not retarded by enalapril and attenuated by MMF or combined enalapril with MMF. Combination therapy was associated with a superior suppression of diabetes-induced macrophage recruitment and overexpression of MCP-1 and TGFbeta1 compared to either monotherapy in renal tissue.

CONCLUSION

The combination of enalapril and MMF confers superiority over monotherapy in renoprotection, a mechanism which may be at least partly correlated with synergistic suppression of increased macrophage recruitment and overexpression of MCP-1 and TGF-beta1 in renal tissue in diabetic rats.

Effects of ESR1, FSHB and RBP4 genes on litter size in a Large White and a Landrace Herd

Abstract. The polymorphisms of ESR1, FSHB and RBP4 genes were detected by PCR-SSCP, PCR and PCR-RFLP in a Large White and a Landrace herd in Beijing, China and the influence of ESR1, FSHB and RBP4 on litter size traits was analyzed using three models. We found polymorphisms for the three genes in Large White besides for ESR1 and RBP4 genes in Landrace. The results showed that the most genotype effects are of ESR1 among these three genes.

A two-compartment exposure device for foliar uptake study

An airtight two-chamber exposure devise was designed for investigating foliar uptake of polycyclic aromatic hydrocarbons (PAHs) by plants. The upper and the bottom chambers of the device were air-tightly separated by an aluminum foil and the plant aerial tissues and roots were exposed in the two chambers, respectively. The device was tested using maize exposed to several PAH species. Positive correlations between air and aerial tissue concentrations of the exposed PAH species were revealed. PAHs spiking in the culture solution had no influence on the leaf concentrations.

Abl deregulates Cdk5 kinase activity and subcellular localization in Drosophila neurodegeneration

Although Abl functions in mature neurons, work to date has not addressed Abl's role on Cdk5 in neurodegeneration. We found that beta-amyloid (Abeta42) initiated Abl kinase activity and that blockade of Abl kinase rescued both Drosophila and mammalian neuronal cells from cell death. We also found activated Abl kinase to be necessary for the binding, activation, and translocalization of Cdk5 in Drosophila neuronal cells. Conversion of p35 into p25 was not observed in Abeta42-triggered Drosophila neurodegeneration, suggesting that Cdk5 activation and protein translocalization can be p25-independent. Our genetic studies also showed that abl mutations repressed Abeta42-induced Cdk5 activity and neurodegeneration in Drosophila eyes. Although Abeta42 induced conversion of p35 to p25 in mammalian cells, it did not sufficiently induce Cdk5 activation when c-Abl kinase activity was suppressed. Therefore, we propose that Abl and p35/p25 cooperate in promoting Cdk5-pY15, which deregulates Cdk5 activity and subcellular localization in Abeta42-triggered neurodegeneration.

Assays for enhanced activity of low efficacy partial agonists at the D(2) dopamine receptor

BACKGROUND AND PURPOSE

Low efficacy partial agonists at the D2 dopamine receptor may be useful for treating schizophrenia. In this report we describe a method for assessing the efficacy of these compounds based on stimulation of [35S]GTPgammaS binding.

EXPERIMENTAL APPROACH

Agonist efficacy was assessed from [(35)S]GTPgammaS binding to membranes of CHO cells expressing D2 dopamine receptors in buffers with and without Na+. Effects of Na+ on receptor/G protein coupling were assessed using agonist/[3H]spiperone competition binding assays.

KEY RESULTS

When [35S]GTPgammaS binding assays were performed in buffers containing Na+, some agonists (aripiprazole, AJ-76, UH-232) exhibited very low efficacy whereas other agonists exhibited measurable efficacy. When Na+ was substituted by N-methyl D-glucamine, the efficacy of all agonists increased (relative to that of dopamine) but particularly for aripiprazole, aplindore, AJ-76, (-)-3-PPP and UH-232. In ligand binding assays, substitution of Na+ by N-methyl D-glucamine increased receptor/G protein coupling for some agonists -. aplindore, dopamine and (-)-3-PPP - but for aripiprazole, AJ-76 and UH-232 there was little effect on receptor/G protein coupling.

CONCLUSIONS AND IMPLICATIONS

Substitution of Na+ by NMDG increases sensitivity in [(35)S]GTPgammaS binding assays so that very low efficacy agonists were detected clearly. For some agonists the effect seems to be mediated via enhanced receptor/G protein coupling whereas for others the effect is mediated at another point in the G protein activation cycle. AJ-76, aripiprazole and UH-232 seem particularly sensitive to this change in assay conditions. This work provides a new method to discover these very low efficacy agonists.

A phase II study of R-CHOP in treatment of diffuse large B-cell lymphoma (DLBCL) subgroups

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Background: Recent studies with genes expression profiling and tissue microarray have divided the diffuse large B cell lymphoma (DLBCL) into prognostically important subgroups with germinal center B cell like (GCB) and non-GCB. However, these results are based on the samples of patients who were received standard CHOP regimen. Combination with CHOP and Rituximab (R-CHOP) has been proved to improve the survival of patients with DLBCL. To evaluate the efficacy of R-CHOP in different subgroups of DLBCL, this phase II study has been conducted. Methods: Previously untreated patients with DLBCL were enrolled in this study. No upper age limit was specified. Patients received six cycles of R-CHOP (rituximab 375 mg/m2, cyclophosphamide 750 mg/m2, doxorubicin 50 mg/m2, vincristine 1.4 mg/m2, and prednisone 40 mg/m2 for 5 days) every 3 weeks. Immunohistochemical stains on paraffin-embedded tissues from diagnostic biopsies from these patients with antibodies against GCB cell (CD10 and Bcl-6) and activation (MUM1). These patients are divided into GCB and non-GCB groups according to the expression of antibodies against CD10, BCL-6 and MUM1. Results: A total of 64 patients were evaluated, 19 in GCB group and 45 in non-GCB group. Complete Remission (CR) rate was achieved 57.9% and 53.3%, in GCB group and in non-GCB group, respectively. (p = 0.737). A median follow-up of 2.2 years, the two-year failure free survival was no different between two groups (p = 0.566). Conclusions: In patients with GCB group or non-GCB group of DLBCL, addition of Rituximab in CHOP regimen, preliminary result was showed in similar response and survival.

No significant financial relationships to disclose.

Relationship between biological and self-reported measures of stress among informal caregivers of patients with prostate cancer

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Background: Informal caregivers of prostate cancer patients often experience chronic psychological stress that may adversely impact their physical and mental health, and their ability to care for their families and the patient. This study aims to determine the association between perceived and biological stress among informal caregivers of prostate cancer patients. Methods: A total of 24 informal caregivers of prostate cancer patients were recruited from both the Jesse Brown VA Center (Lakeside and Westside, Chicago) and the Robert H. Lurie Comprehensive Cancer Center at Northwestern University. Caregivers completed self-reported measures of stress, somatization, life events, burden, health status (SF-36) and mental health. Capillary blood spot samples from caregivers were used to examine two measures of biological stress, Epstein-Barr virus antibody titer and C-reactive protein. Results: Informal caregivers had a mean age of 63 years and were mostly female and spouses of patients with prostate cancer. Many had preexisting co-morbidities, including 45.8% with hypertension, 45.8% with arthritis, and 33.3% with diabetes. Nearly 30% had been hospitalized in the last 12 months. 33.3% of caregivers experienced at least one major life event in the last year and 62.5% had symptoms of somatization illness. Caregivers with symptoms of somatization illness had higher mean Epstein-Barr antibody titers as compared with those without symptoms (Mean EBV antibody titer: 198.3 versus 141.8, respectively (p < 0.05)). Caregiver-reported measures were not correlated with C-reactive protein levels. Caregivers with higher levels of strain perceived more stress in their lives (p < 0.05), but showed relatively high self-esteem (mean = 30.6, SD = 2.8, on a 7–35 scale). Conclusions: These preliminary findings suggest that informal caregivers who report symptoms of somatization illness exhibit signs of relative suppression of the cell-mediated immune processes as a result of the reactivation of the Epstein-Barr virus. Final analyses will be conducted that control for potential confounders and will further elucidate if caregiver stress is associated with suppression of the immune system.

No significant financial relationships to disclose.

Role of lateral alkyl chains in modulation of molecular structures on metal surfaces

We use low energy electron diffraction, scanning tunneling microscopy, first-principles density-functional theory, and molecular mechanics calculations to analyze the adsorption and growth of quinacridone derivatives (QA) with alkyl chains of 4 and 16 carbon atoms on a Ag(110) substrate. Surprisingly, we find that the alkyl chains determine the orientation of the molecular overlayers. While the interaction of QA and the Ag substrate is primarily due to chemical bonding of oxygen to the silver substrate, determining the molecular orientation and preferred adsorption site, the intermolecular arrangement can be adjusted via the length of alkyl chains. We are thus able to fabricate uniform QA films with very well controlled physical properties.

Crystal structure of bis(bis(3-methoxysalicylaldehydato)copper(II)) hexakis(adamantylammonium) hexaperchlorate dihydrate, [{Cu(C8H7O3)2}2] · (C10H15NH3)6(ClO4)6 · 2H2O

C92H140Cl6Cu2N6O38, triclinic, P1̅ (no. 2), a = 12.819(3) Å, b = 13.240(3) Å, c = 16.721(3) Å, α = 95.25(3)°, β = 103.27(3)°, ϒ = 106.01(3)°, V = 2618.5 Å3, Z = 1, Rgt(F) = 0.071, wRref(F2) = 0.220, T = 293 K.