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Results for “elevational migration”

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PubMed1991

Growth regulation of serum-free cultures of epithelial cells from normal human buccal mucosa.

Human buccal epithelial cells have been reared from explants maintained in supplemented MCDB 153 medium. Primary epithelial outgrowths show typical structural features and uniformly express keratins; subunit analyses demonstrate expression of keratins 5, 6, 14, 16/17, and 19. The cells exhibit up to 6% colony forming efficiency and divide at about 0.8 population doublings per day on fibronectin/collagen-coated dishes at clonal density. Studies of markers of proliferation and differentiation in buccal epithelial cells indicate that epidermal growth factor, cholera toxin, retinoic acid, and pituitary extract each exhibit a distinctive ability to enhance growth and variably affect cell migration and cell surface area. Transforming growth factor beta-1 inhibits growth and increases surface area without affecting migration, involucrin expression, and cross-linked envelope formation. Moreover, exposure of cells to fetal bovine serum, the tumor promoting agent 12-O-tetradecanoylphorbol-13-acetate or an elevated Ca2+ concentration (from 0.1 to 1 mM) inhibits growth and induces squamous differentiation as indicated by inhibition of migration, increases in surface area, involucrin expression, or formation of cross-linked envelopes. The results show that epithelial cells can be reproducibly derived from explant cultures of human buccal mucosa specimens and the cells transferred under serum-free conditions. Buccal epithelial cells in culture undergo a pattern of growth and differentiation that mimics parakeratinization in vivo and variably respond to several agents shown to modulate growth of cells that originate from other types of epithelia.

Animals↗
PubMed2025

Genomic-based revelation of genetic structure and adaptive characterization of Schizopygopsis malacanthus in the Jinsha River and Yalong River.

BACKGROUND: As a highly specialized class of schizothoracine fishes, Schizopygopsis malacanthus has attracted much attention due to its widespread distribution. To investigate the impact of the Qinghai‒Tibet movement on S. malacanthus, we analyzed the genetic evolutionary history of this species. RESULTS: These results showed that there was a high level of genetic differentiation between Jinsha River (JSR) populations and Yalong River (YLR) populations. The genetic diversity of intra-YLR populations was higher than that of the intra-JSR populations. There was gene exchange of the Suwalong population to the Huoqu and Ganzi populations. Furthermore, both of the JSR and YLR populations exhibited a gradual increase in the genetic differentiation index from low to high altitudes, and the effective population of high-elevation populations has gradually expanded. In high-altitude populations, the selected genes were enriched in DNA repair, light transduction, and energy metabolism, reflecting the genetic basis for their migration to higher altitudes. CONCLUSIONS: S. malacanthus populations had the higher genetic differentiation and genetic diversity in the JSR and its main tributary YLR. Therefore, we should preserve high-elevation natural river sections as much as possible and reserve habitats for their migration and diffusion.

Animals↗
PubMed2004

Lipid-lowering drug atorvastatin as an adjunct in the management of diabetic macular edema.

PURPOSE: To determine the efficacy of the lipid-lowering drug atorvastatin in reducing retinal hard exudates and subfoveal lipid migration after focal/grid laser photocoagulation in clinically significant macular edema in patients with diabetes with elevated serum lipids. DESIGN: Randomized case trial. METHODS: Thirty patients with type 2 diabetes with clinically significant macular edema, dyslipidemia, and hard exudates of grade 4 and above were assessed in an institutional setting. All patients were subjected to strict metabolic control within 4 to 6 weeks of enrollment. In addition, 15 patients in group A received atorvastatin, a 3-hydroxy-3-methylglutaryl coenzyme A inhibitor; 15 members of group B did not receive any lipid-lowering therapy. All received laser photocoagulation after a metabolic control period and were followed up for a minimum of 18 weeks. The outcome measures were reduction in hard exudates, subfoveal lipid migration, status of macular edema, and visual acuity. RESULTS: The study included 21 men and nine women with noninsulin-dependent diabetes mellitus who could achieve good metabolic control within 4 to 6 weeks of inclusion in the study. All patients had elevated serum lipids at baseline. Ten (66.6%) of 15 patients in treatment group A and two (13.3%) of 15 patients in control group B showed reduction in hard exudates (P =.007). None of the patients in group A and five (33.3%) of 15 in group B showed subfoveal lipid migration after laser photocoagulation (P =.04). Regression of macular edema was seen in nine eyes in group A and five in group B (P =.27). None of the eyes in group A and three eyes in group B showed worsening of visual acuity (P =.22). CONCLUSION: Oral atorvastatin therapy in patients with type 2 diabetes with dyslipidemia reduces the severity of hard exudates and subfoveal lipid migration in clinically significant macular edema and could be an important adjunct in the management of clinically significant macular edema.

Administration, Oral↗
PubMed2004

Critical role of T cell migration in bacterial superantigen-mediated shock in mice.

Bacterial superantigens have been implicated in the pathogenesis of several human diseases. Among them, toxic shock syndrome (TSS) is a prototypic acute intoxication caused by the pyrogenic exotoxin family of superantigens. In this study, we investigated the pathophysiological mechanism of TSS using the Yersinia pseudotuberculosis-derived mitogen (YPM) and its point mutants. The results indicated that YPM could induce toxic shock in BALB/c mice but not in T cell-deficient SCID mice. We found that Vbeta8(+) T cells activated by YPM migrated from peripheral blood to liver as early as 1 h after injection of YPM and that serum level of IFN-gamma was significantly elevated 4 h after YPM injection. Co-administration of anti-IFN-gamma antibody or anti-YPM monoclonal antibody alleviated the liver injury and protected mice from YPM-induced death. Moreover, anti-YPM antibody also suppressed the early migration of Vbeta8(+) T cells from the peripheral circulation and the elevation of serum IFN-gamma level, indicating a pivotal role of T cells in inducing shock in our mouse model.

Animals↗
PubMed1999

Selectin on activated platelets enhances neutrophil endothelial adherence in myocardial reperfusion injury.

OBJECTIVES: The glycoprotein P-selectin is an adhesion molecule that is rapidly expressed on the surface of platelets and endothelium during the inflammatory process. P-selectin on endothelium has been reported to play an important role in reperfusion injury. However, little is known regarding P-selectin on platelets in contributing to the pathophysiology of myocardial reperfusion injury. In this study, we hypothesized that P-selectin on platelets may enhance neutrophil endothelial adherence and this may play a role in neutrophil-mediated reperfusion injury. METHODS: Endothelial cells, cardiomyocytes, platelets and neutrophils were isolated from adult rats. Endothelial cells and cardiomyocytes were cultivated in a co-culture system. After exposure to hypoxia and reoxygenation, neutrophil adherence and migration were examined. RESULTS: After exposure to 6 h of hypoxia, endothelial cells co-incubated with platelets showed significantly greater neutrophil adherence (63.1 +/- 4.0%) and migration (78.2 +/- 6.7%) than endothelial cells alone (adhesion: 44.2 +/- 2.8%, migration: 57.9 +/- 4.9%). These increases were significantly inhibited (adhesion: 42.1 +/- 3.5%, migration: 65.5 +/- 3.8%) by an anti-P-selectin monoclonal antibody. Moreover, the superoxide-anion production was significantly elevated when activated platelets were added to neutrophils. This enhanced production was also inhibited by anti-P-selectin antibody. CONCLUSION: The presence of activated platelets enhanced neutrophil adhesion and migration process after hypoxia reoxygenation. This process may occur following platelet-neutrophil interactions via P-selectin and subsequent neutrophil activation.

Animals↗
PubMed2003

Migration of methyl groups between aliphatic amines in water.

Glycine undergoes spontaneous decarboxylation in dilute aqueous solution at elevated temperatures to form methylamine. During that process, we noticed the appearance of dimethylamine and trimethylamine in smaller amounts that increased gradually with time. These observations suggested the existence of disproportionation reactions of methylamines in water, for which there appears to be no direct precedent in the literature. Every member of the methylamine series is found to yield other members of the methylamine series. When the total concentration of amine was held constant and the rate of reaction was examined as a function of changing pH using the amine itself as the buffer, the initial rate of appearance of the products was found to reach a maximum when the conjugate acid and the conjugate base were present at equivalent concentrations. Near this equivalence point, the rate of reaction varied with pH as expected for a second-order reaction between the protonated and the unprotonated species. Under similar conditions, methyl groups were also found to migrate between the nitrogen atoms of N,N-dimethyl-1,3-propanediamine in a first-order process. With dimethylamine as a common acceptor, trimethylsulfonium ion was found to be approximately 104-fold more reactive than the tetramethylammonium ion at ambient temperature.

Amines↗
PubMed2006

Gastric epithelial expression of macrophage migration inhibitory factor is not altered by Helicobacter pylori infection in humans.

BACKGROUND: Recent reports have shown an upregulation of macrophage migration inhibitory factor (MIF) during gastric ulcer development in a rat model and elevated counts of MIF-positive cells in biopsies from Helicobacter pylori-infected patients. H. pylori infection is a proven cofactor in humans causing gastritis and gastric ulcers. The aim of this study was to characterize MIF expression in human gastric epithelial cells in response to H. pylori. METHODS: MIF mRNA and MIF protein expression was detected in human gastric epithelial cell lines after stimulation with proinflammatory cytokines or infection with H. pylori (cagA+/vacA+) using real-time reverse transcriptase-polymerase and enzyme-linked immunosorbent assay. Interleukin-8 secretion was measured as positive control. MIF mRNA and MIF protein expression was assessed in H. pylori-positive and -negative human gastric biopsy samples. RESULTS: While interleukin-8 mRNA expression and interleukin-8 secretion were upregulated in gastric epithelial cells in vitro after H. pylori infection, no changes in MIF mRNA expression and MIF secretion could be detected. We found no significant differences in MIF expression in total RNA extracted from gastric biopsy tissue when comparing H. pylori-positive to control patients. Likewise, MIF protein expression in gastric epithelium was unaffected by H. pylori infection as compared to uninfected tissue. CONCLUSIONS: While an increased MIF expression and positive effects of MIF blockade in ulcer healing have been shown in a rodent model and elevated numbers of MIF-positive cells have been found in H. pylori-infected human tissue, we herein could not confirm any differences in human gastric epithelial MIF expression and secretion after H. pylori infection in vitro and in vivo.

Biopsy↗
PubMed1999

Elevated B-lymphocyte levels in lesional tissue of non-arthritic psoriasis.

Psoriasis is a chronic inflammatory skin disorder characterized clinically by maculopapular skin lesions and on the cellular level by increased T-lymphocyte activation in the peripheral blood and migration of activated T-lymphocyte into the lesions. The lymphocyte subpopulations in peripheral blood from 21 Kuwaiti patients showed elevated levels of the T-lymphocyte activation marker CD25, as well as increased expression of HLA-DR compared with a group of age and sex-matched controls, confirming published findings on psoriasis. In addition, there was a tendency towards a significant increase in the CD4+/CD45RO+ (memory cell) population that was also consistent with peripheral T-lymphocyte activation. Immunohistological studies showed a heavy infiltrate of all cell types into the lesional tissue including, as expected, activated T-lymphocytes. An unexpected finding was significantly higher levels of B-lymphocytes infiltrating the psoriatic lesions; they numerically exceeded the T-lymphocyte infiltrate. This has previously been reported only in cases of psoriasis with concurrent arthritis. None of the subjects had arthritis, suggesting an immunopathological variant of psoriasis possibly specific to this population group.

Adult↗
PubMed1989

Transmembrane migration technique: reexamination of its usefulness in sperm motility assessments.

A study was carried out using time-exposure photomicrography to investigate the potential usefulness of the transmembrane migration technique in the assessment of drug effects on human sperm motility. Significant but weak correlations were evident between the transmembrane migration ratio (TMMR%) and both % motility (r = 0.43; p less than 0.05) and the amplitude of lateral sperm head displacement (r = 0.40; p less than 0.05). However, no significant correlations were evident between TMMR% and the concentration of motile spermatozoa, mean path velocity, or frequency of sperm head rotation. Exposure to 2.5 mM 2-deoxyadenosine caused significant increases in % motility, mean path velocity, and frequency of sperm head rotation, with no concomitant rise in TMMR%, while 5.0 mM caffeine caused significant elevations in both TMMR% and in % motile cells. It is concluded that the transmembrane migration technique is a relatively insensitive method for detecting subtle but important changes in the movement characteristics of human spermatozoa.

Caffeine↗
PubMed2005

Lycopene inhibits cell migration and invasion and upregulates Nm23-H1 in a highly invasive hepatocarcinoma, SK-Hep-1 cells.

The carotenoid lycopene has been associated with decreased risks of several types of cancer, such as prostate cancer and hepatoma. Tumor metastasis is the most important cause of cancer death. Although lycopene was shown to inhibit metastasis, the mechanism underlying this action is not well understood. Here, we tested the possibility that lycopene may inhibit cancer cell metastasis by upregulating the expression of nm23-H1, a metastasis suppressor gene, in SK-Hep-1 cells, a highly invasive hepatoma cell line, and we determined migration and invasion activities and the expression of nm23-H1 protein and mRNA. We showed that lycopene inhibited SK-Hep-1 migration and invasion in a bell-shaped manner, with the highest effect at 5 micromol/L (91 and 63% inhibition for migration and invasion, respectively; P < 0.05). At the same test level (10 micromol/L), lycopene was much more effective than beta-carotene in reducing cell invasion (by approximately 870%). In contrast to the effects on migration and invasion, lycopene enhanced nm23-H1 expression at both the protein and mRNA levels; the effects were also bell shaped, and at 5 micromol/L, lycopene enhanced nm23-H1 protein and mRNA expressions by 220 +/- 33 and 153 +/- 22% (P < 0.01), respectively. These bell-shaped effects of lycopene may be related to autoxidation of lycopene at elevated concentrations (> or =10 micromol/L). Significant correlations existed between nm23-H1 protein expression and migration (r2= 0.78, P < 0.001) and between nm23-H1 protein expression and invasion (r2= 0.84, P < 0.001) in lycopene-treated SK-Hep-1 cells. We conclude that lycopene has significant antimigration and anti-invasion activity, and that this effect is associated with its induction of nm23-H1 expression.

Anticarcinogenic Agents↗
PubMed1993

[Episodic angioedema with eosinophilia].

In 1984, Gleich et al. originally reported a novel syndrome of episodic angioedema with eosinophilia. The syndrome is characterized by recurrent angioedema, urticaria, weight gain, elevated IgM levels, marked blood eosinophilia, and eosinophil infiltrates in the dermis. It has also been observed that activated CD4+ T cells are present in the dermis of patients with this syndrome, suggesting that T cell-derived cytokines especially IL-5 might be involved in the migration and activation of eosinophils in the skin. Indeed, it has recently been reported that serum IL-5 levels elevate during clinical exacerbation of this syndrome. However, it still remains to be elucidated what antigen periodically activates CD4+ T cells, what factor(s) determine selective migration of eosinophils into the skin, and so on.

Angioedema↗
PubMed1989

Diabetes, the ice free corridor, and the Paleoindian settlement of North America.

Since the 1940s, many Amerindian populations, including some with mixed Amerindian ancestry, have experienced an epidemic of obesity and adult-onset diabetes (NIDDM). Obesity and NIDDM were apparently rare among Amerindian populations prior to that time. Though the evidence is equivocal, obesity and NIDDM seem to be rare today among Athapaskan Amerindians of the North American Arctic, sub-Arctic, and Southwest. It is hypothesized that the Amerindian genotype(s) susceptible to obesity and NIDDM arose from selection favoring "thrifty" genes during the peopling of North America south of the continental glaciers. "Thrifty" genes (Neel: Am. J. Hum. Genet. 14:353-362, 1962) allowed a more efficient food metabolism as hunter-gatherers from an unusually harsh mid-latitude tundra environment (the "ice free" corridor) adapted to more typical mid-latitude environments to the south. The early Paleoindian settlement pattern from Wyoming to Arizona and Texas indicates a relatively brief period of reliance on unpredictable big game resources in lower elevations and smaller game and gathered resources in higher elevations. This unusual "specialist" settlement pattern may have resulted from the early Paleoindian's unfamiliarity with gathered foods and small game in lower elevations. Athapaskan populations evidently moved south from Beringia sometime after the Paleoindian migration when the "ice free" corridor had widened and contained environments and resources more typical of subarctic latitudes. Thus, Athapaskan hunter-gatherers could gradually adapt to the resources of lower latitudes such that "thrifty" genes would not have been as advantageous. The interaction of recently introduced "western" diets and "thrifty" genes have evidently led to today's epidemic of obesity and NIDDM among Amerindians of Paleoindian ancestry.

Canada↗
PubMed2005

Developmental transcription factor slug is required for effective re-epithelialization by adult keratinocytes.

During re-epithelialization of cutaneous wounds, keratinocytes recapitulate several aspects of the embryonic process of epithelial-mesenchymal transition (EMT), including migratory activity and reduced intercellular adhesion. The transcription factor Slug modulates EMT in the embryo and controls desmosome number in adult epithelial cells, therefore, we investigated Slug expression and function during cutaneous wound re-epithelialization. Slug expression was elevated in keratinocytes bordering cutaneous wounds in mice in vivo, in keratinocytes migrating from mouse skin explants ex vivo, and in human keratinocytes at wound margins in vitro. Expression of the related transcription factor Snail was not significantly modulated in keratinocytes during re-epithelialization in vitro. Epithelial cell outgrowth from skin explants of Slug knockout mice was severely compromised, indicating a critical role for Slug in epithelial keratinocyte migration. Overexpression of Slug in cultured human keratinocytes caused increased cell spreading and desmosomal disruption, both of which were most pronounced at wound margins. Furthermore, in vitro wound healing was markedly accelerated in keratinocytes that ectopically expressed Slug. Taken together, these findings suggest that Slug plays an important role during wound re-epithelialization in adult skin and indicate that Slug controls some aspects of epithleial cell behavior in adult tissues as well as during embryonic development.

Animals↗
PubMed1988

Serial study of liver-directed autoantibodies and autoreactive T-lymphocytes in acute viral hepatitis B.

To explore the mechanisms underlying liver-directed autoimmune reactions in acute Hepatitis B Virus (HBV) infection, we followed five subjects who were identified in the early incubation phase (30-70 days before the first elevation of transaminases). We assessed serially cellular (using a T-lymphocyte migration inhibitory factor assay) and humoral (RIA) immunity to LSP (a macromolecular, liver-derived lipoprotein complex) and hepatic lectin (HL), the liver-specific receptor for desialylated glycoproteins, which appears to be a major target antigen for autoreactions in autoimmune chronic active hepatitis. Anti-LSP and anti-HL autoantibodies were found, at some stage during acute HBV infection, in 4/5 subjects, whereas cellular immunity to the same antigens was detected in only two patients. Sustained production of anti-HL antibodies was noted only in patients showing cellular immunity to this antigen and was apparently secondary to liver damage, whereas anti-LSP antibodies were first detected at the onset of liver injury when there was no evidence of T-cell immunity to the same antigenic complex. One explanation for this apparent dichotomy between cellular and humoral responses to LSP is that a helper T-cell response to the major envelope component of HBV, HBsAg, which precedes by 10-20 days the development of anti-LSP antibodies, promotes a humoral reaction to autoantigens contained in the LSP preparation, coexpressed with HBsAg, on the surface of infected hepatocytes.

Adolescent↗
PubMed2003

Antigen-induced chemokine activation in mouse buccal epithelium.

The oral mucosa is an active though poorly understood immunological site. Using an experimental animal system involving antigen priming into the oral mucosa of transgenic mice expressing T cell receptor (TCR) for a peptide antigen of hen-egg lysozyme (HEL), the expression of six chemokine receptors and seven chemokine ligands were studied before and after antigen exposure. Within 24h of local antigen priming, the expression of three chemokine receptor genes (CCR3, CCR5, and CCR7) and three chemokine ligand genes (CCL12, CCL19, and CCL25) were significantly upregulated. These included chemokines known to be responsible for the trafficking of T cells and other leukocytes into tissue sites. Additionally, expression of the chemokine ligand gene, CCL25 (thymus-expressed chemokine [TECK]), which has been linked to T cell migration and/or local T cell development in the intestine, was also markedly elevated in buccal epithelia after antigen exposure. These findings define a process of selective activation of proinflammatory chemokines and/or their receptors following local antigen exposure, and they provide the first evidence, indicating that this may be accompanied by in situ development of T cells in oral tissues.

Animals↗
PubMed1996

Increased plasma concentrations of circulating intercellular adhesion molecule-1 (cICAM-1) in patients with necrotizing pancreatitis.

The intercellular adhesion molecule-1 (ICAM-1), a membrane glycoprotein, is important in the adhesion of cytokine-stimulated leukocytes to the endothelium of microvessels and their transendothelial migration. Circulating isoforms of ICAM-1 (cICAM-1) are known to be elevated in human serum as an indirect consequence of inflammatory responses. The aim of this study was to investigate whether cICAM-1 levels are elevated in patients with acute pancreatitis within 48 h of the onset of abdominal pain and whether cICAM-1 levels correlate with the severity of the tissue damage. Twenty-five consecutive patients admitted to a medical ICU had elevated cCAM-1 concentrations of 548 +/- 68 ng/ml, significantly different when compared to a control group of 18 healthy subjects (343 +/- 29; p = 0.018). According to the findings of contrast-enhanced CT or laparotomy patients were further divided in a group with acute edematous pancreatitis and a group with acute necrotizing pancreatitis. Pancreatic necrosis was associated with cICAM-1 levels of 729 +/- 106 ng/ml, significantly different from patients with mild disease (367 +/- 48) and controls (p < 0.001). Plasma cICAM-1 levels were not significantly different between healthy subjects and patients with mild pancreatitis. A significant correlation was found between cICAM-1 and C-reactive protein, an acute phase reactant and marker of necrotizing pancreatitis (r = 0.62; p < 0.01). The sensitivity and specificity for the detection of edematous or necrotizing pancreatitis of cICAM-1 plasma concentrations (cutoff point at 500 ng/ml) were 75% and 85%, respectively. These results suggest an enhanced release of ICAM-1 into plasma in the early stage of acute necrotizing pancreatitis. Leukocyte-endothelial cell adhesion may be associated with the inflammatory process of necrotizing tissue damage in acute pancreatitis. It could thus serve as a marker or predictor of a severe clinical course of pancreatitis.

Adult↗
PubMed1983

Pulmonary superoxide dismutase activity in the mouse infected with Ancylostoma caninum larvae.

Albino mice were infected per os with 1000 infective larvae of Ancylostoma caninum and pulmonary superoxide dismutase activity was studied after completion of lung migration. The total superoxide dismutase activity per mg of lung protein was elevated by 15% in infected mice. Of the two forms of superoxide dismutases studied, that containing Cu-Zn was elevated by 44%. This suggests that A. caninum in mice may result in histopathological changes leading to transient pulmonary oxygen toxicity.

Ancylostomiasis↗
PubMed2003

High serum YKL-40 levels in patients with primary breast cancer is related to short recurrence free survival.

YKL-40 is a growth factor for connective tissue cells and stimulates migration of endothelial cells. YKL-40 is secreted by cancer cells, and elevated serum YKL-40 in patients with metastatic breast cancer and colorectal cancer is associated with a poorer prognosis as compared to patients with normal serum YKL-40. In the present study we evaluated the associations of preoperative serum YKL-40 in 271 patients with primary breast cancer in relation to relapse-free survival and overall survival. The median follow-up time was 5.9 years. There were 77 relapses and 69 patients died. The median serum YKL-40 concentration in the patients was 57 microg/l (range 22-688 microg/l) and significantly elevated (p < 0.0001) compared to serum YKL-40 in healthy females. Nineteen percent of the patients had high serum YKL-40 (i.e., >95 percentile of healthy females). Patients with high serum YKL-40 had shorter relapse-free interval (hazard ratio (HR) = 1.77, 95% confidence interval (CI): 1.06-2.95, p = 0.028) and overall survival (HR = 1.78, 95% CI: 1.04-3.05, p = 0.036) than patients with normal serum YKL-40. Serum YKL-40 was higher (p = 0.005) in lymph node positive patients as compared to lymph node negative patients. Multivariate analysis including lymph node status, estrogen receptor status, tumor size, age, menstrual status and serum YKL-40 showed that serum YKL-40 was an independent prognostic variable of relapse-free survival (HR = 1.73, 95% CI: 1.03-2.91, p = 0.039). Our results show that serum YKL-40 in patients with primary breast cancer at time of operation is only elevated in a small group of patients, but these patients have a shorter recurrence free interval. Further studies are required to determine the biological function of YKL-40 in breast cancer.

Adipokines↗