Can risk factor screening predict hepatitis C antibody reactivity?

The object of this study was to investigate the prevalence of Hepatitis C virus (HCV) by second-generation testing and to determine the effectiveness of risk factor-guided screening. We performed a prospective study of HCV exposure determined by second-generation enzyme-linked immunoadsorbent assay (ELISA) and confirmed by radioimmunoblot assay (RIBA). Risk factors (RF) were interpreted by univariate and multivariate analyses.

Comparison of dose-response relationships for induction of lipid metabolizing and growth regulatory genes by peroxisome proliferators in rat liver.

The regulation of gene expression via the peroxisome proliferator-activated receptor (PPAR) is believed to be critical in the effects of peroxisome proliferators on lipid metabolism and possibly in hepatocarcinogenesis. The involvement of PPAR in the peroxisome proliferator-mediated induction of fatty acid metabolizing genes such as acyl-CoA oxidase (ACO), fatty acid-binding protein (FABP), and cytochrome P450IVA1 (CYP4A1) has been clearly demonstrated. However, the induction by peroxisome proliferators of important growth regulatory genes such as c-myc has not been investigated extensively.

A multicenter study comparing dorzolamide and pilocarpine as adjunctive therapy to timolol: patient preference and impact on daily life.

Background: A multicenter, 4-week, two-period crossover study, comparing 2% dorzolamide three times daily to 2% pilocarpine four times daily as adjunctive therapy to 0.5% timolol twice daily, was conducted on 81 patients with elevated intraocular pressure (IOP). The treatments were evaluated for patient preference, tolerability, impact on daily life, IOP control, and visual-field changes.

Medical management of neonatal posthemorrhagic hydrocephalus.

Posthemorrhagic hydrocephalus is a relatively common complication of premature birth. One third of patients who do not undergo spontaneous resolution require medical management aimed at normalizing intracranial pressure by correcting the imbalance between cerebrospinal fluid (CSF) production and drainage. Serial lumbar punctures intermittently remove CSF in bulk.

Sequence of the FRA3B common fragile region: implications for the mechanism of FHIT deletion.

The hypothesis that chromosomal fragile sites may be "weak links" that result in hot spots for cancer-specific chromosome rearrangements was supported by the discovery that numerous cancer cell homozygous deletions and a familial translocation map within the FHIT gene, which encompasses the common fragile site, FRA3B. Sequence analysis of 276 kb of the FRA3B/FHIT locus and 22 associated cancer cell deletion endpoints shows that this locus is a frequent target of homologous recombination between long interspersed nuclear element sequences resulting in FHIT gene internal deletions, probably as a result of carcinogen-induced damage at FRA3B fragile sites.

Green fluorescent protein as a reporter for retrovirus and helper virus-free HSV-1 amplicon vector-mediated gene transfer into neural cells in culture and in vivo.

Green fluorescent protein (GFP) is an effective marker for retrovirus and herpes virus vector-mediated gene transfer into various central nervous system-derived cells, both proliferative and non-proliferative, in culture and in vivo. Retrovirus vectors were used to stably transduce several rat and human glioma lines, and a multipotent mouse neural progenitor line in culture. Implantation of selected pools of transduced glioma cells into rodent brain allowed clear visualization of the tumor and the invading tumor edge.

Removal of anaphylatoxins C3a and C5a and chemokines interleukin 8 and RANTES by polyester white cell-reduction and plasma filters.

Background: A few bedside polyester white cell (WBC)-reduction filters have been shown to scavenge C3a anaphylatoxin from stored blood components. One has been shown to remove the chemokines interleukin (IL)-8 and RANTES, but not the proinflammatory cytokines IL-1, IL-6, and tumor necrosis factor alpha. Removal by any filter of the anaphylatoxin C5a or the soluble membrane attack complex (SC5b-9) has not been studied.

Expression of the Na-K-2Cl cotransporter is developmentally regulated in postnatal rat brains: a possible mechanism underlying GABA's excitatory role in immature brain.

An inhibitory neurotransmitter in mature brain, gamma-aminobutyric acid (GABA) also appears to be excitatory early in development. The mechanisms underlying this shift are not well understood. In vitro studies have suggested that Na-K-Cl cotransport may have a role in modulating immature neuronal and oligodendrocyte responses to the neurotransmitter GABA.

Differentiation of engrafted multipotent neural progenitors towards replacement of missing granule neurons in meander tail cerebellum may help determine the locus of mutant gene action.

Previously we observed that stable clones of multipotent neural progenitor cells, initially isolated and propagated from the external granular layer of newborn wild-type mouse cerebellum, could participate appropriately in cerebellar development when reimplanted into the external granular layer of normal mice. Donor cells could reintegrate and differentiate into neurons (including granule cells) and/or glia consistent with their site of engraftment. These findings suggested that progenitors might be useful for cellular replacement in models of aberrant neural development or neurodegeneration.

Multipotent neural precursors can differentiate toward replacement of neurons undergoing targeted apoptotic degeneration in adult mouse neocortex.

Neurons undergoing targeted photolytic cell death degenerate by apoptosis. Clonal, multipotent neural precursor cells were transplanted into regions of adult mouse neocortex undergoing selective degeneration of layer II/III pyramidal neurons via targeted photolysis. These precursors integrated into the regions of selective neuronal death; 15 +/- 7% differentiated into neurons with many characteristics of the degenerated pyramidal neurons.

Safety evaluation of recombinant human interleukin-4. I. Preclinical studies.

Recombinant human IL-4 (rhuIL-4) has been evaluated in a series of preclinical studies. These studies have demonstrated that rhuIL-4 is a very potent cytokine with a wide range of pharmacologic and toxicologic effects. Target systems/organs included the cardiovascular system, liver, spleen, and bone marrow.

Alterations in sympathetic innervation of thymus and spleen in aged mice.

Age is associated with reduced immune reactivity, contributing to increased rates of infectious disease and cancer in old age. We have begun to assess the potential for sympathetic nervous system involvement in age-related immune dysfunction by characterizing sympathetic noradrenergic (NA) innervation in lymphoid organs in old animals. In the present study noradrenergic innervation of spleen and thymus was examined histologically and neurochemically in 2-, 12- and 24-month old BALB/c mice.

Leukotrienes in ulcerative colitis: results of a multicenter trial of a leukotriene biosynthesis inhibitor, MK-591.

Background & Aims: Leukotrienes (LTs) are believed to be important in the pathogenesis of ulcerative colitis (UC). The aim of this study was to determine whether inhibition of LT biosynthesis with a 5-lipoxygenase inhibitor (MK-591) induces remission in patients with mild to moderate UC.

Methods: One hundred eighty-three patients with mild to moderately active UC enrolled in this randomized parallel group, double-blind study.

The use of nonneuronal cells for gene delivery.

The implantation of genetically engineered nonneuronal cells can provide an effective method for achieving localized delivery of discrete molecules to the CNS or for providing substrates for regrowth of neural structures. Most primary nonneuronal cells have the advantage of being easily obtainable from the prospective host for ex vivo retrovirus-mediated genetic manipulation (most will be mitotic in culture) and reimplantation as an autologous graft (circumventing the problem of immune rejection). As primary cells, they are unlikely to be tumorigenic.

Setting roller pump occlusion with the transonic HT109 flowmeter.

Setting the occlusion of a roller pump may be facilitated using the TRansonic HT109 Ultrasonic Flowmeter (Transonic Systems, Inc. Ithaca, NY) with non-invasive transducer. The process addresses the need to set occlusion quickly and accurately before initiation of extracorporeal membrane oxygenation (ECMO).

Gene therapy in neurology.

Many methods of gene transfer to the brain are under study for the treatment of the central nervous system manifestations of a number of diseases. One strategy employs vectors--typically genetically altered viruses--for the delivery of exogenous genes directly to a host's brain cells in situ. Alternatively, transplanting cells--of either neural or nonneural origin--that intrinsically secrete missing or therapeutic gene produces, or which are genetically engineered ex vivo to do so, may provide another strategy.

Assessing dissimilarity of genes by comparing their RNAse A mismatch cleavage patterns.

We propose a simple algorithm for estimating the number of nucleotide differences between a pair of RNA or DNA sequences through comparison of their RNAse A mismatch cleavage patterns. In the RNAse A mismatch cleavage technique two or more sample sequences are hybridized to the same RNA probe, the hybrids are partially digested with RNAse A, and the digestion products are compared on an electrophoretic gel. Here we provide an algorithm for converting the numbers of unique and matching electrophoretic bands into an estimate of the number of nucleotide differences between the sequences.

A putative poststreptococcal case of OCD with chronic tic disorder, not otherwise specified.

A 12-year-old girl presented with an atypical, recurrent, increasingly treatment-resistant case of obsessive-compulsive disorder and chronic tic disorder associated with profound separation anxiety, learning difficulty, and intermittent upper respiratory symptoms. In addition to detailed reviews of history and findings from many clinical caretakers from the prior 7 years, current pediatric, psychiatric, neuropsychological, neuroimaging, and clinical laboratory data were also available. Treatment options were considered from multiple perspectives: psychoanalytically oriented psychotherapy, conventional pharmacotherapy, family interventions, cognitive-behavioral therapy, and learning-supportive strategies.