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Expression of inducible nitric oxide synthase is significantly correlated with expression of vascular endothelial growth factor and dendritic cell infiltration in patients with advanced gastric carcinoma.

OBJECTIVE: Nitric oxide (NO) is a product of L-arginine to L-citrulline conversion by nitric oxide synthase (NOS). The inducible form of NOS (iNOS) is one of three classes of NOS and the strongest producer of NO. It has been reported that NO correlates with angiogenesis and immune responses in some types of cancer, however, the correlations between iNOS expression, angiogenesis, and immune responses are still unclear in gastric carcinoma. METHODS: iNOS expression was determined in 135 gastric cancer patients by immunohistochemical procedures and compared with the expression of vascular endothelial growth factor (VEGF), microvessel (MV) density, and dendritic cell (DC) infiltration to evaluate the effect of iNOS on angiogenesis and immune responses in gastric carcinoma. RESULTS: iNOS expression was detected in 106 (78.5%) of 135 cases. There was a close correlation between iNOS expression and VEGF expression, a correlation with MV density and an inverse correlation with DC infiltration. There was no correlation between iNOS and p53 expression. The prognoses of patients whose tumors expressed iNOS were significantly worse than those of patients whose tumors did not express iNOS. Multivariate analysis indicated iNOS expression was an independent prognostic factor. CONCLUSION: iNOS might be associated with tumor progression by stimulating angiogenesis and suppressing immune responses in gastric carcinoma.

Adenocarcinoma↗

Evaluation of polydimethylsiloxane scaffolds with physiologically-relevant elastic moduli: interplay of substrate mechanics and surface chemistry effects on vascular smooth muscle cell response.

Polydimethylsiloxane (PDMS) is used extensively to study cell-substrate interactions because its mechanical properties are easily tuned in physiologically relevant ranges. However, changes in mechanical properties also modulate surface chemistry and cell response. Here, we correlate the mechanical and surface properties of PDMS to vascular smooth muscle cell (VSMC) behavior. We find that a 5-fold increase in base:crosslinker ratio leads to approximately 40-fold decrease in elastic modulus but no significant differences in surface wettability. However, when polyelectrolyte multilayers are adsorbed to promote cell adhesion, wettability varies inversely with substrate stiffness. Despite these differences in hydrophobicity, the amount of adsorbed protein remains the same. In the absence of serum, there is a 39% decrease in cell attachment and a 42% decrease in spreading as the elastic modulus decreases from 1.79 to 0.05 MPa. In the presence of serum or adsorbed fibronectin, the differences in attachment and spreading are diminished. This is not the case for the rate of serum-stimulated cell proliferation, which remains inversely dependent on crosslinker concentration. We conclude that for the range of crosslinker concentrations investigated, the surface properties dominate the initial cell attachment and spreading, whereas the mechanical properties influence the long-term cell growth.

Adsorption↗

Mendelian randomization reveals causal relationships between cytokines and male reproductive diseases.

This study aims to explore the causal links between cytokines and four male reproductive disorders, namely abnormal spermatozoa (AS), male infertility, erectile dysfunction (ED), and hyperplasia of prostate (HP), employing a two-sample Mendelian randomization (MR) approach. Genetic associations with male reproductive diseases were derived from the IEU OpenGWAS project, with cytokine data from two GWASs focused on the human proteome and cytokines. Estimations were derived using inverse variance weighting, MR-Egger regression, weighted median, weighted model, and simple mode. Furthermore, the robustness of the findings was evaluated through Cochran's Q-test, MR-Egger regression, and leave-one-out sensitivity analysis. Fifteen unique cytokines were identified as having causal relationships with the risk of four male reproductive disorders. Specifically, for AS, interleukin-22 (IL-22), IL-12, and macrophage migration inhibitory factor were negatively correlated with AS, while tumor necrosis factor β levels were positively correlated with AS. In the context of male infertility, IL-2 receptor antagonist levels, IL-34, and granulocyte-colony stimulating factor levels were positively linked to male infertility, whereas IL-21 showed a negative relationship. Regarding ED, IL-19, IL-1β, and eotaxin levels were negatively associated with ED risk, while macrophage inflammatory protein 1β (MIP-1β) levels and interferon gamma-induced protein 10 levels were positively associated. As for HP, stromal-cell-derived factor 1α levels and MIP-1α levels revealed negative associations with HP. In conclusion, this MR analysis revealed that several cytokines were causally associated with male reproductive diseases and could be valuable in offering new insights for further mechanistic and clinical investigations of cytokines-associated male reproductive diseases.

Male↗

Disturbed synthesis of insulinlike growth factor I and its binding proteins may influence renal function changes in liver cirrhosis.

Insulinlike growth factor-1 (IGF-1) is an anabolic hormone synthesized by the liver upon stimulation by growth hormone (GH). IGF-1 exerts important effects on renal hemodynamics and renal sodium handling. The bioactivity of this hormone is influenced by its binding proteins (BP) of which IGF-BP3 favors retention in the capillary lumen while IGF-BP1 facilitates the transport to the target tissues. IGF-BP1 modulates the actions of IGF-1 on target cells including renal tubules. Although a number of reports have dealt with disturbances of the IGF-1/IGF-BP system in cirrhosis, no studies have yet addressed the relationship between alterations in this system and renal function changes in cirrhosis. In the present study we have included 20 patients with cirrhosis and 10 healthy subjects (control group). As compared with the controls, patients showed lower circulating levels of IGF-1 and IGF-BP3, higher IGF-BP1 levels, and a tendency to higher insulinemia and GH values. The index IGF-1 x IGF-BP1/IGF-BP3 (IGF-1-IGF-BP index, reflecting the accessibility of circulating IGF-1 to target cells) was higher in patients with ascites. IGF-1 directly correlated with renal blood flow (P < 0.05), with IGF-BP3 (P < 0.001) and inversely with the Pugh's score (P < 0.02). A negative correlation was found between IGF-1-IGF-BP index and fractional sodium excretion (P < 0.01) and between IGF-BP1 and urinary sodium excretion (P < 0.02). Our findings support the hypothesis that the disturbance of the IGF-1/IGF-BP axis may be related to the degree of renal vasodilation and renal sodium retention in cirrhotic patients.

Female↗

Increased potassium concentration inhibits stimulation of vascular smooth muscle proliferation by PDGF-BB and bFGF.

The effects of changes in extracellular potassium concentration on the rate of vascular smooth muscle cell proliferation stimulated by cytokines and serum were analyzed in vitro. To analyze the DNA synthesis response, cells from swine coronary artery were grown in DMEM medium containing 3, 4, 5, or 6 mmol/L potassium together with 20 ng/mL platelet-derived growth factor BB (PDGF-BB), 25 ng/mL basic fibroblast growth factor (bFGF), or 5% fetal bovine serum (FBS), with [methyl 3H] thymidine added, for 24 h. Proliferation responses were analyzed in cells grown in medium with potassium concentrations of 3, 4, 5, or 6 mmol/L, together with either 20 ng/mL PDGF-BB, 25 ng/mL bFGF, or 5% FBS, for 7 days, then harvested and counted. Highly significant inverse relationships were observed between potassium concentration and 3H-thymidine incorporation stimulated by each of the three agonists (P < .01 for each, ANOVA), and between potassium concentration and proliferation (all P < .01, ANOVA). Elevation of potassium concentration within the physiologic range inhibits vascular smooth muscle cell DNA synthesis and proliferation.

Animals↗

Reduction in T cell apoptosis in patients with HIV disease following antiretroviral therapy.

Patients with HIV infection manifest increased T lymphocyte apoptosis. This study investigated the influence of antiretroviral therapy (ART) upon lymphocyte apoptosis in 23 HIV-infected adults naive to protease inhibitors. Patients were enrolled in a treatment trial consisting of Nelfinavir (NFV), d4T, or NFV + d4T for 24 weeks, followed by triple therapy (NFV + reverse transcriptase inhibitors) for an additional 24 weeks. Spontaneous T cell apoptosis in cultured PBMC decreased by 23.67 +/- 18.2% (P < 0.006) at 48 weeks and plasma HIV RNA decreased by 1.79 +/- 0.59 log(10) RNA copies/ml (P < 0.001). The absolute decrease and slope of T cell apoptosis correlated with plasma virus load and with activated CD8 T cells and was inversely correlated with CD4 T cells. We conclude that reduction in chronic antigenic stimulation and the absence of cellular signals elicited by viral products contribute to the rescue of T lymphocytes from apoptosis, which facilitates immunologic recovery in ART-treated patients.

Adult↗

Invasive lobular and invasive ductal carcinoma of the breast show distinct patterns of vascular endothelial growth factor expression and angiogenesis.

Angiogenesis is essential for tumour growth and important in tumour metastasis and prognosis. Vascular endothelial growth factor (VEGF) stimulates endothelial proliferation in vitro and angiogenesis in vivo. VEGF expression has been correlated with high vascularity in tumours, including carcinoma of the breast. This study investigated VEGF expression and vascularity of invasive lobular (n = 10) and invasive ductal carcinoma (n = 28), and pure ductal carcinoma in situ of the breast (n = 33). VEGF protein expression was studied with immunohistochemistry and VEGF mRNA with in situ hybridization. Vascular density was assessed on sections stained for von Willebrand factor. There was more expression of both VEGF protein (P = 0.006) and mRNA (P = 0.002) in invasive ductal than in invasive lobular carcinoma. VEGF protein (rs = 0.32, P = 0.047) and mRNA (rs = 0.56, P = 0.04) correlated with vascular density in invasive ductal carcinoma. In invasive lobular carcinoma, vascular density did not correlate with VEGF mRNA (rs = 0.15, P = 0.35) and was inversely related to VEGF protein (rs = -0.57, P = 0.04). There were no significant differences in vascular density between the two types of invasive carcinoma, suggesting that VEGF is important in angiogenesis in invasive ductal carcinoma, but that other angiogenic factors are important in invasive lobular carcinoma. Although VEGF protein was frequently expressed in ductal carcinoma in situ, no relationship was found between VEGF and the two patterns of angiogenesis previously described.

Breast↗

Environmental regulation of the fim switch controlling type 1 fimbrial phase variation in Escherichia coli K-12: effects of temperature and media.

Expression of type 1 fimbriae in Escherichia coli K-12 is phase variable and associated with the inversion of a short DNA element (switch). The fim switch requires either fimB (on-to-off or off-to-on switching) or fimE (on-to-off switching only) and is affected by the global regulators leucine-responsive regulatory protein (Lrp), integration host factor (IHF), and H-NS. Here it is shown that switching frequencies are regulated by both temperature and media and that these effects appear to be independent. fimE-promoted on-to-off switching occurs far more rapidly than previously estimated (0.3 per cell per generation in defined rich medium at 37 degrees C) and faster at lower than at higher temperatures. In direct contrast, fimB-promoted switching increases with temperature, with optima between 37 and 41 degrees C. Switching promoted by both fimB and fimE is stimulated by aliphatic amino acids (alanine, isoleucine, leucine, and valine), and this stimulation requires lrp. Furthermore, lrp appears to differentially regulate fimB- and fimE-promoted switching in different media.

Agar↗

Serum and CNTF stimulate oligodendroglia and reduce fiber outgrowth from striatal cultures.

Organotypic slice cultures of newborn rat striatal tissue displayed an exceptionally dense and fasciculated outgrowth of GABAergic fibers when grown in a chemically defined medium, compared to serum-containing medium. The enhanced fiber growth was not the result of an increased density of GABAergic neurons in the cultures, but coincided with a marked reduction of 2',3'-cyclic nucleotide 3'-phosphodiesterase (CNPase)-immunoreactive cells within and around the cultures. An inverse, causal relationship between the number of CNPase-positive cells, presumably of oligodendroglial lineage, and GABAergic fiber outgrowth was further evidenced by the observation that addition of ciliary neurotrophic factor (CNTF) to the chemically defined medium resulted in both an increase in CNPase-positive cells and a decrease in GABAergic fiber outgrowth. The observations suggest that CNTF and serum indirectly inhibit axonal growth by stimulating oligodendroglial cells.

Animals↗

Apolipoprotein AI and HDL(3) inhibit spreading of primary human monocytes through a mechanism that involves cholesterol depletion and regulation of CDC42.

The objective of the current study was to characterize the influence of high density lipoproteins (HDL) on processes related to the vascular recruitment of human monocytes, which may contribute to the anti-atherogenic properties of these lipoproteins. We show that HDL(3) and apo AI inhibit the following processes in primary human monocytes: (1) M-CSF induced cell spreading; (2) M-CSF stimulated expression of surface molecules involved in adhesion, migration, and scavenging; (3) fMLP induced chemotaxis. These processes are obviously modulated by the regulation of cellular cholesterol pools as indicated by the following findings. In Tangier monocytes with defective apo AI induced cholesterol efflux, apo AI had no influence on the spreading response. In control cells, stimulation of cholesterol efflux by p-cyclodextrin mimicked the effect of apo AI and HDL(3) on spreading and chemotaxis, whereas cholesterol loading with enzymatically modified LDL (E-LDL) showed the opposite effect. Finally, a similar inverse regulation by E-LDL and apo AI/HDL(3) was also observed in regard to the surface expression of beta(1)- and beta(2)-integrins as well as the hemoglobin/haptoglobin scavenger receptor CD163 and the Fcgamma-IIIaR CD16. CDC42 was identified as a potential downstream target linking changes in cellular cholesterol content to monocyte spreading and chemotaxis. Thus, CDC42 antisense markedly reduced spreading and, in parallel with their influence on monocyte spreading, HDL(3), apo AI and p-cyclodextrin down-regulated CDC42 expression while E-LDL had the inverse effect. The apo AI induced decrease of CDC42 protein expression was paralleled by the reduction of active GTP-bound CDC42. In summary, we provide evidence that HDL(3) and apo AI are able to inhibit processes in primary human monocytes, which are related to the recruitment of monocytes into the vessel wall and probably involve regulation of cellular cholesterol pools and CDC42 function.

Apolipoprotein A-I↗

Increased sensitivity of glycogen synthesis to phosphorylase-a and impaired expression of the glycogen-targeting protein R6 in hepatocytes from insulin-resistant Zucker fa/fa rats.

Hepatic insulin resistance in the leptin-receptor defective Zucker fa/fa rat is associated with impaired glycogen synthesis and increased activity of phosphorylase-a. We investigated the coupling between phosphorylase-a and glycogen synthesis in hepatocytes from fa/fa rats by modulating the concentration of phosphorylase-a. Treatment of hepatocytes from fa/fa rats and Fa/? controls with a selective phosphorylase inhibitor caused depletion of phosphorylase-a, activation of glycogen synthase and stimulation of glycogen synthesis. The flux-control coefficient of phosphorylase on glycogen synthesis was glucose dependent and at 10 mm glucose was higher in fa/fa than Fa/? hepatocytes. There was an inverse correlation between the activities of glycogen synthase and phosphorylase-a in both fa/fa and Fa/? hepatocytes. However, fa/fa hepatocytes had a higher activity of phosphorylase-a, for a corresponding activity of glycogen synthase. This defect was, in part, normalized by expression of the glycogen-targeting protein, PTG. Hepatocytes from fa/fa rats had normal expression of the glycogen-targeting proteins G(L) and PTG but markedly reduced expression of R6. Expression of R6 protein was increased in hepatocytes from Wistar rats after incubation with leptin and insulin. Diminished hepatic R6 expression in the leptin-receptor defective fa/fa rat may be a contributing factor to the elevated phosphorylase activity and/or its high control strength on glycogen synthesis.

Animals↗

Inverse regulation of the ADAM-family members, decysin and MADDAM/ADAM19 during monocyte differentiation.

Two members of the ADAM (a disintegrin and metalloprotease)-family, MADDAM and decysin, were described as dendritic cell (DC) maturation markers. We are interested in monocyte differentiation and investigated in particular the expression pattern of both genes during the differentiation of human monocytes into DC and macrophages (MAC). Both genes are weakly expressed in freshly isolated monocytes. In immature DC decysin mRNA was absent, even after induction of the terminal differentiation of DC by CD40L or tumour necrosis factor-alpha (TNF-alpha). Only in DC maturated by lipopolysaccharide (LPS) strong signals of decysin mRNA were detected. However, MADDAM mRNA was expressed in immature DC and the expression was markedly increased after induction of the terminal DC differentiation by various stimuli. In contrast, MAC showed a high constitutive decysin mRNA expression, but expressed no MADDAM mRNA. On protein level similar results of MADDAM expression were obtained. Stimulation of MAC by LPS did not induce MADDAM mRNA expression, while decysin mRNA expression was strongly increased. Further investigations revealed that the well-known inducer of MAC differentiation, 1alpha,25-dihydroxyvitamin D3 up-regulated decysin mRNA expression during the differentiation of primary monocytes and myelomonocytic THP-1 cells into MAC. In vivo decysin mRNA expression was only detected in human colon, but not in other tissues we examined. Accordingly, isolated intestinal MAC expressed decysin mRNA. In conclusion, decysin and MADDAM mRNA expression were regulated in an opposite way during monocyte differentiation: MADDAM mRNA and protein was mainly detected in DC, whereas decysin mRNA expression was mainly found in MAC. Therefore only MADDAM, but not decysin is a suitable marker for human monocyte-derived DC.

ADAM Proteins↗

Transforming growth factor beta inhibits growth of more differentiated myeloid leukemia cells and retinoblastoma protein phosphorylation at serine 795.

Transforming growth factor beta (TGF-beta) has been shown to be a specific inhibitor of early human myeloid progenitors. We show here that TGF-beta1 potentially inhibited not only the growth of primitive but also more mature myeloid leukemic cells. Surprisingly, those apparently more mature progenitor cells, such as MV4-11 and Mo7e cells, are very sensitive to the action of TGF-beta. The addition of TGF-beta1 to liquid cultures of these cells significantly inhibited their proliferation, with as much as 72% inhibition of growth of MV4-11 cells. The suppressive effect by TGF-beta1 was not reversed or prevented by granulocyte-macrophage colony-stimulating factor or interleukin 3 used to promote cell growth in TF-1a and MV4-11 cells. TGF-beta1 completely abolished the clonal growth of MV4-11 cells in soft agar and inhibited Mo7e, KG-1, K562, TF-1, and TF-1a colony growth by 99%, 90%, 63%, 53%, and 43%, respectively. The cells treated with TGF-beta1 showed progressive accumulation in the G1 phase of cell cycle. Maximal G1 arrest (93%) was observed in MV4-11 cells. Using anti-retinoblastoma protein (pRb) and anti-specific phosphorylated-pRb antibodies, we demonstrated that TGF-beta1 greatly inhibited pRb phosphorylation at serine 795 in MV4-11 and Mo7e cells. Taken together, our data suggest that the sensitivity of myeloid leukemic progenitor cells to growth inhibition by TGF-beta may not be inversely correlated with their maturation stage, and the inhibition of the cells appeared to be linked to the suppression of pRb phosphorylation at serine 795.

Cell Differentiation↗

Immunomodulation of the induction phase of lymphokine-activated killer activity by acute phase proteins.

Effective treatment of head and neck cancer with biologic response modifiers may be benefitted by an understanding of in vivo factors capable of modulating the lymphokine-activated killer (LAK) cell phenomenon. Eighteen patients with squamous cell carcinoma of the head and neck were studied. Killer cells from each patient, activated by recombinant interleukin-2 (10 U/ml), were induced in either complete medium alone or complete medium plus 10% autologous serum solution and analyzed. Cytotoxicity against both K562 and squamous cell carcinoma (MDA686-Ln) cell lines was determined by use of standard chromium-release assays. The immunomodulatory capacity of serum was correlated with levels of various acute phase proteins. Autologous serum significantly inhibited the induction phase of the LAK phenomenon in 61% of patients and stimulated it in 22%. No patients with early stage I or II disease had significant inhibition of induction. No direct correlation between inhibition and serum acute phase protein levels were seen. An inverse relationship was seen between the C3 component of complement and induction inhibition (r = -0.6). These findings suggest that advances of in vivo immunomodulatory therapy will require elucidation of mechanisms of serologic inhibition of the induction phase of the LAK phenomenon. Such studies may lead to serologic modification to enhance treatment efficacy of biologic response modifiers.

Acute-Phase Proteins↗

Oxygen regulates mitogen-stimulated proliferation of fetal human airway smooth muscle cells.

Increased airway smooth muscle (ASM) content is characteristic of infants with chronic lung disease of prematurity/bronchopulmonary dysplasia. Oxygen therapy, reactive oxygen species (ROS), and immature antioxidant defenses are major risk factors in chronic lung disease of prematurity/bronchopulmonary dysplasia, but their interrelationship is unclear. The direct effects of raised Po2 and modulation of ROS were examined on proliferation of cultured fetal human ASM cells. A bell-shaped relationship was found between Po2 and DNA synthesis induced by fetal bovine serum, platelet-derived growth factor, and basic fibroblastic growth factor, with peak responses occurring at 10-kPa Po2. Changes in DNA synthesis by Po2 did not occur in the absence of mitogen. ROS generation, estimated by dichlorodihydrofluorescein oxidation, was increased by mitogens but was unaffected by nonmitogens (bradykinin, histamine). There was an inverse relationship between ROS generation and Po2, and mitogen-induced ROS generation was substantially potentiated as the Po2 fell. H2O2 mimicked the effect of Po2 on fetal bovine serum-stimulated proliferation, whereas treatment with antioxidants (GSH, N-acetylcysteine) reduced it. These data demonstrate that increases in Po2 above levels found in utero modulate proliferation of fetal ASM cells but only in the presence of growth factors. They also strongly suggest that, under these conditions, proliferation is mediated in part by generation of ROS.

Acetylcysteine↗

Cell density dependent uptake of LDL in cultured rat hepatocytes.

An inverse relationship between low-density lipoprotein uptake and cell density was observed in rat hepatocyte monolayers incubated with lipoprotein-deficient serum. This was also true for cell association, binding and degradation of low-density lipoproteins. Compactin stimulated cell association and degradation of low-density lipoproteins both at low and high concentrations. Insulin, on the other hand, had no consistent effect on low-density lipoprotein cell association or degradation.

Animals↗

Quality specifications in thyroid diseases.

BACKGROUND: Laboratory tests to support the diagnosis and management of thyroid diseases have undergone significant changes with the introduction of highly sensitive assays for thyroid stimulating hormone (TSH) and free T4 and T3 concentrations in plasma. Given the importance of these measurements, quality specifications are needed to ensure accurate results. Goals for precision and accuracy are available based on known intraindividual and interindividual biological variation. METHODS: Results of external quality assurance (EQA) schemes are sufficient to document precision goals but survey materials are not commutable for use in determining bias or detect the presence of unusual antibodies on a case-by-case basis. Because TSH concentrations are inversely related to free T4, this physiologic relationship can be exploited for quality assurance purposes. RESULTS: Significant discordance between this relationship can be caused by subclinical and potentially unrecognized disease, dysequilibrium caused by recent therapy, the presence of abnormal binding proteins or protein binding competitor drugs, and antibody interferences such as human antimouse antibody (HAMA) or rheumatoid factor. CONCLUSION: A mechanism to automatically track discordances for subsequent follow and investigation can be an effective part of a quality assurance program for thyroid hormone measurements.

Antibodies, Heterophile↗

Ultrahigh resolution drug design I: details of interactions in human aldose reductase-inhibitor complex at 0.66 A.

The first subatomic resolution structure of a 36 kDa protein [aldose reductase (AR)] is presented. AR was cocrystallized at pH 5.0 with its cofactor NADP+ and inhibitor IDD 594, a therapeutic candidate for the treatment of diabetic complications. X-ray diffraction data were collected up to 0.62 A resolution and treated up to 0.66 A resolution. Anisotropic refinement followed by a blocked matrix inversion produced low standard deviations (<0.005 A). The model was very well ordered overall (CA atoms' mean B factor is 5.5 A2). The model and the electron-density maps revealed fine features, such as H-atoms, bond densities, and significant deviations from standard stereochemistry. Other features, such as networks of hydrogen bonds (H bonds), a large number of multiple conformations, and solvent structure were also better defined. Most of the atoms in the active site region were extremely well ordered (mean B approximately 3 A2), leading to the identification of the protonation states of the residues involved in catalysis. The electrostatic interactions of the inhibitor's charged carboxylate head with the catalytic residues and the charged coenzyme NADP+ explained the inhibitor's noncompetitive character. Furthermore, a short contact involving the IDD 594 bromine atom explained the selectivity profile of the inhibitor, important feature to avoid toxic effects. The presented structure and the details revealed are instrumental for better understanding of the inhibition mechanism of AR by IDD 594, and hence, for the rational drug design of future inhibitors. This work demonstrates the capabilities of subatomic resolution experiments and stimulates further developments of methods allowing the use of the full potential of these experiments.

Acetates↗