Outcome of gastric electrical stimulator with and without pyloromyotomy for refractory gastroparesis.

BACKGROUND: Surgical treatments of refractory gastroparesis include pyloromyotomy and gastric electrical stimulator (GES). It is unclear if patients may benefit from a combined approach with concomitant GES and pyloromyotomy. METHODS: Retrospective cohort analysis of all patients with refractory gastroparesis treated with GES implantation with and without concomitant pyloromyotomy at Cleveland Clinic Florida from January 2003 to January 2023. Primary endpoint was efficacy (clinical response duration and success rate) and secondary endpoints included safety (postoperative morbidity) and length of stay. Success rate was defined as the absence of one of the following reinterventions during follow-up: Roux-en-Y gastric bypass (RYGB), pyloromyotomy, GES removal. RESULTS: During a period of 20 years, 134 patients were treated with GES implantation. Three patients with history of previous surgical pyloromyotomy or RYGB were excluded from the analysis. Median follow-up was 31 months (IQR 10, 72). Forty patients (30.5%) had GES with pyloromyotomy, whereas 91 (69.5%) did not have pyloromyotomy. Most of the patients had idiopathic (n = 68, 51.9%) or diabetic (n = 58, 43.3%) gastroparesis. Except for preoperative use of opioids (47.5 vs 14.3%; p < 0.001), patient's characteristics were similar in both groups. There were no significant differences between the two groups in terms of overall postoperative complications (17.5% vs 14.3%; p = 0.610), major postoperative complications (0% vs 2.2%; p = 1), and length of stay (2(IQR 1, 2) vs 2(IQR 1, 3) days; p = 0.068). At 5 years, success rate was higher in patients with than without pyloromyotomy however not statistically significant (82% versus 62%, p = 0.066). Especially patients with diabetic gastroparesis seemed to benefit from pyloromyotomy during GES (100% versus 67%, p = 0.053). In an adjusted Cox regression, GES implantation without pyloromyotomy was associated with a 2.66 times higher risk of treatment failure compared to GES implantation with pyloromyotomy (HR 2.66, 95% CI 1.03-6.94, p = 0.044). CONCLUSION: Pyloromyotomy during GES implantation for gastroparesis seems to be associated with a longer clinical response with similar postoperative morbidity and length of hospital stay than GES without pyloromyotomy. Patient with diabetic gastroparesis might benefit from a combination of GES implantation and pyloromyotomy.

HIV treatment cascade in regions of Peru with the highest HIV prevalence.

OBJECTIVES: To describe the HIV treatment cascade and care continuum in regions of highest HIV prevalence in Peru. METHODS: An observational longitudinal study was carried out in 14 tertiary hospitals in Peru. These are the main hospitals that administer antiretroviral treatment (ART) in the regions that represent approximately 95% of reports of HIV/AIDS cases in Peru in 2013. We included individuals older than 18 years newly diagnosed with HIV from 1 January 2011 to 31 December 2012. Medical records were reviewed until 2015. RESULTS: A total of 2119 people living with HIV (PLHIV) were identified in the selected health facilities (mean age = 35.26 years, 78% male). 97.25% [1845/1897; 95% confidence interval (CI): 96.4-97.9%] of the patients attended the consultation at least once during the follow-up, but only 64.84% (885/1365; 95% CI: 62.2-67.4%) attended within a month after the diagnosis. After starting ART, 74.63% (95% CI: 71.9-77.2%) of PLHIV remained in healthcare. Regardless of the time after diagnosis, 88.40% (1837/2078; 95% CI: 86.9-89.7%) of PLHIV started ART during the observation time. However, 78.68% (95% CI: 76.8-80.4%) did so during the first post-treatment year and only 28.88% (95% CI: 27.9-31.9%) after 1 month. After starting treatment, it was observed that 51.60% (95% CI: 49.2-54%) of PLHIV reached viral suppression during the follow-up period. CONCLUSIONS: Further analysis and improvements in the definition of indicators are required to achieve conclusive results; however, these data will give us a general understanding of the progress of Peruvian health policies in achieving the goal established by the WHO.

Don't take the context out of the picture: Contextually shaped parents' and children's obesogenic behaviors in a marginalized area of Mexico City.

Santa Fe Gully zone is a marginalized area of Mexico City where nearly 39% of children live with either overweight or obesity. Despite the extensive research on obesogenic behaviors, studies frequently overlook the contexts where such behaviors occur. This qualitative study described individual and familial obesogenic behaviors among children with obesity from Santa Fe Gully, and explained how these behaviors might be contextually shaped. We used a grounded theory approach to investigate the process of development/maintenance of obesity in our sample. Fifteen participants (seven 10-year-olds with overweight or obesity and their parents) participated in nine art-based focus groups, and parents completed individual semi-structured interviews. Data were analyzed using a structured thematic content analysis. Results showed children's weight status was part of their identity, providing children with a familial 'fitting' sense while increasing psychosocial difficulties, leading to emotional overeating as a coping strategy. Parents' use of controlling and low-structured parenting practices reinforced children's emotional overeating and failed to regulate children's dietary and physical activity behaviors. Some low-structured parenting practices were guilt-motivated or fostered by socioeconomic and cultural factors (e.g., limited food access, unhealthy food exposure, community unsafety). Future interventions in Santa Fe Gully aimed at modifying obesogenic behaviors should incorporate systemic and ecological approaches to help participants navigate through contextual obstacles, as their behaviors should be analized considering the context where they occur.

Transcriptomic analysis of polyaromatic hydrocarbon degradation by the halophilic fungus Aspergillus sydowii at hypersaline conditions.

Polycyclic aromatic hydrocarbons (PAHs) are among the most persistent xenobiotic compounds, with high toxicity effects. Mycoremediation with halophilic Aspergillus sydowii was used for their removal from a hypersaline medium (1 M NaCl). A. sydowii metabolized PAHs as sole carbon sources, resulting in the removal of up to 90% for both PAHs [benzo [a] pyrene (BaP) and phenanthrene (Phe)] after 10 days. Elimination of Phe and BaP was almost exclusively due to biotransformation and not adsorption by dead mycelium and did not correlate with the activity of lignin modifying enzymes (LME). Transcriptomes of A. sydowii grown on PAHs, or on glucose as control, both at hypersaline conditions, revealed 170 upregulated and 76 downregulated genes. Upregulated genes were related to starvation, cell wall remodelling, degradation and metabolism of xenobiotics, DNA/RNA metabolism, energy generation, signalling and general stress responses. Changes of LME expression levels were not detected, while the chloroperoxidase gene, possibly related to detoxification processes in fungi, was strongly upregulated. We propose that two parallel metabolic pathways (mitochondrial and cytosolic) are involved in degradation and detoxification of PAHs in A. sydowii resulting in intracellular oxidation of PAHs. To the best of our knowledge, this is the most comprehensive transcriptomic analysis on fungal degradation of PAHs.

Sound and Air: Ultrasonographic Measurements of Pediatric Chest Wall Thickness and Implications for Needle Decompression of Tension Pneumothorax.

OBJECTIVES: Needle decompression is potentially life-saving in cases of tension pneumothorax. Although Advanced Trauma Life Support recommends an 8-cm needle for decompression for adults, no detailed pediatric guidelines exist, specifically regarding needle length or site of decompression. METHODS: Point-of-care ultrasound was used to measure chest wall thickness (CWT), the distance between skin and pleural line, bilaterally at the second intercostal midclavicular line and the fourth intercostal anterior axillary line in children of various ages and sizes. Patients were grouped based on Broselow tape weight categories. Measurements were compared between left versus right sides at the 2 anatomic sites. Interclass correlation coefficients were calculated to assess for interrater reliability. RESULTS: A convenience sample of 163 patients from our emergency department was enrolled. For patients who fit into Broselow tape categories, CWT at the second intercostal midclavicular line ranged from 1.11 to 1.91 cm and at the fourth intercostal anterior axillary line ranged from 1.13 to 1.92 cm. In patients larger than the largest Broselow category, 77% had a CWT less than the length of a standard 1.25-in (3.175 cm) catheter. There were no significant differences in the measurements of CWT based on laterality nor anatomic site. CONCLUSIONS: The standard 1.25-in (3.175 cm) catheters are sufficient to treat most tension pneumothoraces in pediatric patients.

Isotopic enrichment in Rhizoprionodon porosus (Poey, 1861) and Carcharhinus porosus (Ranzani, 1840) embryos.

Isotopic values of two Caribbean sharpnose shark Rhizoprionodon porosus litters (Poey, 1861) with two and three embryos and one litter of 11 smalltail shark Carcharhinus porosus embryos showed enriched 15 N and 13 C compared to their mothers. In R. porosus, embryonic isotope values were 3.06 ± 0.07‰ and 0.69 ± 0.15‰ greater than their mothers' for δ15 N and δ13 C, respectively, whereas in C. porosus, δ15 N and δ13 C were 1.79 ± 0.09‰ and 1.31 ± 0.17‰ greater in embryos than their mothers.

Repeated ketamine administration induces recognition memory impairment together with morphological changes in neurons from ventromedial prefrontal cortex, dorsal striatum, and hippocampus.

Ketamine is an anesthetic agent that antagonizes N-methyl-d-aspartate receptors, inducing psychotic-like symptoms in healthy humans and animals. This agent has been used as a pharmacological tool for studying biochemical and physiological mechanisms underlying the clinical manifestations of schizophrenia. The main goal of this study was to evaluate the effect of repeated injections of ketamine (5 and 10 mg/kg, i.p., daily for 5 days) on recognition memory and neuronal morphology in ICR-CD1 mice. This treatment induced recognition memory impairment in the novel object recognition test and a decrease in dendritic spines density in both dorsal striatum and CA1-hippocampus. Sholl analysis showed that both ketamine doses decrease the dendritic arborization in ventromedial prefrontal cortex, dorsal striatum, and CA1-hippocampus. Finally, dendritic spines morphology was modified by both doses; that is, an increase of the filipodia-type spines (10 mg/kg) and a reduction of the mushroom-type spines (5 and 10 mg/kg) was observed in the ventromedial prefrontal cortex. In the dorsal striatum, the low dose of ketamine induced an increase in long thin spines and a decrease of mushroom spines. Interestingly, in CA1-hippocampus, there was an increase in the mushrooms type spines (5 mg/kg). Current findings suggest that the subchronic blockade of N-methyl-d-aspartate receptor changes the neuronal plasticity of several brain regions putatively related to recognition memory impairment.

Parental Practices and Maternal Warmth as Protective Factors for Problem Behaviors in Mexican Preadolescents.

Epidemiological estimates indicate that approximately 12% of children and adolescents in Mexico are in clinical ranges for psychological disorders. Low-income families in need of psychological support generally encounter understaffed and sometimes inefficient public health services and thus, families frequently constitute the primary source of support for individuals affected by mental health disorders. Empirical studies in the Mexican context have demonstrated that positive parental practices are associated with positive developmental outcomes and low levels of problem behaviors for both children and adolescents. This study aims to identify if such practices act as protective factors for problem behaviors in 306 Mexican students in 4th, 5th, and 6th grades from 3 public elementary school s in Mexico City. Practices of maternal autonomy and communication as well as maternal warmth were found to significantly diminish internalizing and externalizing problem behaviors, while parental involvement and communication only reduced externalizing problem behaviors. Findings have implications for social welfare programs that target positive youth development and supportive parenting.

A Web-Based Exercise System (e-CuidateChemo) to Counter the Side Effects of Chemotherapy in Patients With Breast Cancer: Randomized Controlled Trial.

BACKGROUND: Breast cancer patients have to face a high-risk state during chemotherapy, which involves deterioration of their health including extensive physical deterioration. Face-to-face physical exercise programs have presented low adherence rates during medical treatment, and telehealth systems could improve these adherence rates. OBJECTIVE: This study aimed to evaluate the effectiveness of a Web-based exercise program (e-CuidateChemo) to mitigate the side effects of chemotherapy on the physical being, anthropometric aspects, and body composition. METHODS: A total of 68 patients diagnosed with breast cancer, who were undergoing chemotherapy, were enrolled. The patients were categorized into two groups: e-CuidateChemo (n=34) and controls (n=34). The e-CuidateChemo group participated in an adapted 8-week tailored exercise program through a Web-based system. A blinded, trained researcher assessed functional capacity, strength, anthropometric parameters, and body composition. The intervention effects were tested using analysis of covariance and Cohen d tests. RESULTS: Functional capacity improved significantly in the e-CuidateChemo group compared to the control group (6-minute walk test: 62.07 [SD 130.09] m versus -26.34 [SD 82.21] m; 6-minute walk test % distance predicted: 10.81% [SD 22.69%] m versus -4.60% [SD 14.58%]; between-group effect: P=.015 for both). The intervention group also showed significantly improved secondary outcomes such as between-group effects for abdominal (24.93 [SD 26.83] s vs -18.59 [SD 38.69] s), back (12.45 [SD 10.20] kg vs 1.39 [10.72] kg), and lower body (-2.82 [SD 3.75] s vs 1.26 [SD 2.84] s) strength; all P<.001 compared to the control group. CONCLUSIONS: This paper showed that a Web-based exercise program was effective in reversing the detriment in functional capacity and strength due to chemotherapy. TRIAL REGISTRATION: ClinicalTrials.gov NCT02350582; https://clinicaltrials.gov/ct2/show/NCT02350582.

Use of Point-of-Care Ultrasound to Assess and Guide Renal Stent Repositioning in the Pediatric Emergency Department.

Point-of-care ultrasound can be used as an assessment tool during the evaluation of children with renal colic. We discuss the case of a 7-year-old girl presenting to the pediatric emergency department with left flank pain, vomiting, and urinary incontinence status post-left renal stent placement. Renal ultrasound revealed ureteral obstruction caused by renal stent displacement. Point-of-care ultrasound performed by pediatric emergency department physicians was used to assess renal stent location, repositioning, and confirmation of the new location by the urology team. We discuss the role of transabdominal point-of-care ultrasound for the evaluation and treatment of the symptomatic child with recent ureter stent placement.

A Multi-institutional Case Series With Review of Point-of-Care Ultrasound to Diagnose Malrotation and Midgut Volvulus in the Pediatric Emergency Department.

Point-of-care ultrasound can be used to screen for malrotation with and without volvulus in the newborn with bilious vomiting, as well as children with unexplained intermittent abdominal pain. We discuss cases where infants and children presenting to pediatric emergency departments with bilious vomiting and/or intermittent abdominal pain were initially screened for small bowel pathology with point-of-care ultrasound. Bedside findings suggestive of midgut volvulus were confirmed with radiology-performed ultrasound or upper gastrointestinal fluoroscopy. In all cases, operative findings were consistent with malrotation of the small bowel with or without evidence of midgut volvulus.

Factors that Explain the Cancer-Related Insomnia.

A better understanding of cancer related insomnia and its relationship with other associated factors is necessary to improve its management. To clarify the relationship between insomnia and treatment related variables, sociodemographic data, health related fitness, pain, anxiety, and depression in breast cancer patients. One hundred twenty-three patients participated in this cross-sectional study. As a primary variable was insomnia using The European Organization for Research and Treatment of Cancer Quality of Life Questionnaire Core 30 version. Other variables included: stage of treatment, type of treatment, multiple sit to stand test, trunk curl test, 6-min walk test, back muscle strength test, the Brief Pain Inventory short form and the Hospital Anxiety and Depression Scale. Insomnia was negatively associated with the treatment stage (p = 0.01), the 6-min walk test (p = 0.01) and the back muscle strength test (p = 0.01), while it was positively associated with the type of treatment (p = 0.01) and the multiple sit-to-stand test (p = 0.05). In addition, higher levels of insomnia were associated with higher scores on the Brief Pain Inventory short form (p = 0.01) and the Hospital Anxiety and Depression Scale (p = 0.01). Anxiety, type of treatment, back muscle strength, pain severity and stage of treatment were predictors of insomnia, and when they were combined they explained 51.2% of insomnia in our sample. The variability in insomnia related breast cancer is explained by anxiety, type of treatment, pain, treatment stage, and back muscle strength. Clinicians should take these results into account when generating cancer care programs to control pain and health-related-fitness (Registration of Trials NCT01801527).

Telehealth system: A randomized controlled trial evaluating the impact of an internet-based exercise intervention on quality of life, pain, muscle strength, and fatigue in breast cancer survivors.

BACKGROUND: The chronicity status of breast cancer survivors suggests a growing need for cancer rehabilitation. Currently, the use of technology is a promising strategy for providing support, as reflected in the emergence of research interest in Web-based interventions in cancer survivorship. METHODS: A randomized controlled trial was conducted that included a total of 81 participants who had completed adjuvant therapy (except hormone treatment) for stage I to IIIA breast cancer. Participants were randomly assigned to an 8-week Internet-based, tailored exercise program (n = 40) or to a control group (n = 41).The instruments used at baseline, 8 weeks, and 6-month follow-up were the European Organization for Research and Treatment of Cancer Quality-of-Life Questionnaire Core 30 and its breast cancer module, the Brief Pain Inventory, the handgrip dynamometer, the isometric abdominal test, the back dynamometer, the multiple sit-to-stand test, and the Piper Fatigue Scale. RESULTS: After the intervention, the telerehabilitation group had significantly improved scores for global health status, physical, role, cognitive functioning, and arm symptoms (all P < .01) as well as pain severity (P = .001) and pain interference (P = .045) compared with the control group. Significant improvements also were observed favoring the telerehabilitation group for affected and nonaffected side handgrip (both P = .006), abdominal, back and lower body strength (all P < .01), and total fatigue (P < .001). These findings were maintained after 6 months of follow-up, except for role functioning, pain severity, and nonaffected side handgrip. Analysis was based on an intention-to-treat principle. CONCLUSIONS: This program may improve adverse effects and maintain benefits in breast cancer survivors. The results of this study have encouraging implications for cancer care. Cancer 2016;122:3166-74. © 2016 American Cancer Society.

A novel tetravalent formulation combining the four aggregated domain III-capsid proteins from dengue viruses induces a functional immune response in mice and monkeys.

Our group developed a subunit vaccine candidate against dengue virus based on two different viral regions: the domain III of the envelope protein and the capsid protein. The novel chimeric protein from dengue-2 virus [domain III-capsid (DIIIC-2)], when presented as aggregated incorporating oligodeoxynucleotides, induced anti-viral and neutralizing antibodies, a cellular immune response and conferred significant protection to mice and monkeys. The remaining constructs were already obtained and properly characterized. Based on this evidence, this work was aimed at assessing the immune response in mice of the chimeric proteins DIIIC of each serotype, as monovalent and tetravalent formulations. Here, we demonstrated the immunogenicity of each protein in terms of humoral and cell-mediated immunity, without antigen competition on the mixture forming the formulation tetra DIIIC. Accordingly, significant protection was afforded as measured by the limited viral load in the mouse encephalitis model. The assessment of the tetravalent formulation in non-human primates was also conducted. In this animal model, it was demonstrated that the formulation induced neutralizing antibodies and memory cell-mediated immune response with IFN-γ-secreting and cytotoxic capacity, regardless the route of immunization used. Taken together, we can assert that the tetravalent formulation of DIIIC proteins constitutes a promising vaccine candidate against dengue virus, and propose it for further efficacy experiments in monkeys or in the dengue human infection model, as it has been recently proposed.

The Six-Minute Walk Test as a Measure of Health in Breast Cancer Patients.

This study examined the relationship between the 6-min walk test (6MWT) and fitness, psychological and physiologic states, quality of life, cancer-related symptoms, and body composition of 87 women with breast cancer. The assessment included the 6MWT and evaluations of Cancer Quality of Life (EORTC C-30 and EORTC BR-23), cognitive performance (Trail Making Test), the Hospital Anxiety and Depression Scale, body composition, health-related fitness (abdominal test, multiple sit-to-stand test, trunk dynamometry), and pain (Brief Pain Inventory). We observed the following correlations: moderate between 6MWT and pain interference; modest for cognitive and social functioning and the multiple sit-to-stand test; fair for several items on the Cancer Quality of Life, for anxiety, lean body mass, trunk dynamometry and pain intensity; and weak for role functioning, loss of appetite, cognitive performance and depression. Thus, the 6MWT could be used as a measure of the major components of global health in women with breast cancer.

NFE2L2 Gene Variants and Arsenic Susceptibility: A Lymphoblastoid Model.

Arsenic (As) exposure is a major risk for several types of cancer and metabolic diseases such as diabetes. The transcription factor nuclear factor erythroid 2-related factor (Nrf2) is a key mediator in the cellular defense against As-induced adverse effects. The -653G/A and -617C/A gene variants modulate expression levels of the Nrf2 coding gene (NFE2L2) and are postulated to be associated with several illnesses. In this study the functional effect of these polymorphisms was investigated in the cellular sensitivity to As-mediated effects. Using quantitative real-time polymerase chain reaction (qRT-PCR) the basal levels of NFE2L2 mRNA and the induced levels of NFE2L2 and its target gene NQO1 were measured in lymphoblastoid cells carrying different genotypes for -653G/A and -617C/A polymorphisms following As exposure. The effects of different NFE2L2 gene genotypes on cell proliferation were also explored after chronic metal exposure. A tendency toward reduction in basal levels of NFE2L2 mRNA was noted in the heterozygous (GA/CA) and risk homozygous (AA/AA) genotypes of both polymorphisms in immortalized lymphoblastoid cells. Although the expression of NFE2L2 and NQO1 after acute acute iAs exposure was not markedly influenced by -653G/A and -617C/A genotype, it was found that these single-nucleotide polymorphisms (SNPs) were correlated with a differential sensitivity to chronic exposure to the metalloid. Further studies are needed to completely understand the role of -653G/A and -617C/A SNPs in regulation of the NFE2L2 gene.

Arizona Study of Aging and Neurodegenerative Disorders and Brain and Body Donation Program.

The Brain and Body Donation Program (BBDP) at Banner Sun Health Research Institute (http://www.brainandbodydonationprogram.org) started in 1987 with brain-only donations and currently has banked more than 1600 brains. More than 430 whole-body donations have been received since this service was commenced in 2005. The collective academic output of the BBDP is now described as the Arizona Study of Aging and Neurodegenerative Disorders (AZSAND). Most BBDP subjects are enrolled as cognitively normal volunteers residing in the retirement communities of metropolitan Phoenix, Arizona. Specific recruitment efforts are also directed at subjects with Alzheimer's disease, Parkinson's disease and cancer. The median age at death is 82. Subjects receive standardized general medical, neurological, neuropsychological and movement disorders assessments during life and more than 90% receive full pathological examinations by medically licensed pathologists after death. The Program has been funded through a combination of internal, federal and state of Arizona grants as well as user fees and pharmaceutical industry collaborations. Subsets of the Program are utilized by the US National Institute on Aging Arizona Alzheimer's Disease Core Center and the US National Institute of Neurological Disorders and Stroke National Brain and Tissue Resource for Parkinson's Disease and Related Disorders. Substantial funding has also been received from the Michael J. Fox Foundation for Parkinson's Research. The Program has made rapid autopsy a priority, with a 3.0-hour median post-mortem interval for the entire collection. The median RNA Integrity Number (RIN) for frozen brain and body tissue is 8.9 and 7.4, respectively. More than 2500 tissue requests have been served and currently about 200 are served annually. These requests have been made by more than 400 investigators located in 32 US states and 15 countries. Tissue from the BBDP has contributed to more than 350 publications and more than 200 grant-funded projects.

A tetravalent dengue vaccine containing a mix of domain III-P64k and domain III-capsid proteins induces a protective response in mice.

Recombinant fusion proteins containing domain III of the dengue virus envelope protein fused to the P64k protein from Neisseria meningitidis and domain III of dengue virus type 2 (D2) fused to the capsid protein of this serotype were immunogenic and conferred protection in mice against lethal challenge, as reported previously. Combining the domain III-P64k recombinant proteins of dengue virus types 1, 3 and 4 (D1, D3, and D4) with the domain III-capsid protein from D2, we obtained a novel tetravalent formulation containing different antigens. Here, the IgG and neutralizing antibody response, the cellular immune response, and the protective capacity against lethal challenge in mice immunized with this tetravalent formulation were evaluated. The neutralizing antibody response obtained against D1, D2 and D3, together with the high levels of IFNγ secretion induced after stimulation with the four dengue serotypes, supports the strategy of using a new tetravalent formulation containing domain III of the envelope protein fused to the capsid protein of each dengue virus serotype.

Recombinant dengue 2 virus NS3 protein conserves structural antigenic and immunological properties relevant for dengue vaccine design.

The NS3 protein is a multifunctional non-structural protein of flaviviruses implicated in the polyprotein processing. The predominance of cytotoxic T cell lymphocytes epitopes on the NS3 protein suggests a protective role of this protein in limiting virus replication. In this work, we studied the antigenicity and immunogenicity of a recombinant NS3 protein of the Dengue virus 2. The full-length NS3 gene was cloned and expressed as a His-tagged fusion protein in Escherichia coli. The pNS3 protein was purified by two chromatography steps. The recombinant NS3 protein was recognized by anti-protease NS3 polyclonal antibody and anti-DENV2 HMAF by Western Blot. This purified protein was able to stimulate the secretion of high levels of gamma interferon and low levels of interleukin-10 and tumor necrosis factor-α in mice splenocytes, suggesting a predominantly Th-1-type T cell response. Immunized BALB/c mice with the purified NS3 protein showed a strong induction of anti-NS3 IgG antibodies, essentially IgG2b, as determined by ELISA. Immunized mice sera with recombinant NS3 protein showed specific recognition of native dengue protein by Western blotting and immunofluorescence techniques. The successfully purified recombinant protein was able to preserv the structural and antigenic determinants of the native dengue protein. The antigenicity shown by the recombinant NS3 protein suggests its possible inclusion into future DENV vaccine preparations.