Effects of psychogenic stress on oxidative stress and antioxidant capacity at different growth stages of rats: Experimental study.

This study examined the psychogenic stress (PS) effects on changes in oxidative stress and the antioxidant capacity of an organism at different growth stages. The experimental animals were male Wistar rats of five different ages from growth periods (GPs) to old age. The growth stages were randomly classified into control (C) and experimental (PS) groups. The PS was performed using restraint and water immersion once daily for 3 h for 4 weeks. Reactive oxygen metabolites (d-ROMs) and the biological antioxidant potential (BAP) were measured before and after the experiment. In addition, the liver and adrenal glands were removed, and the wet weight was measured. The d-ROM and BAP of all growth stages given PS increased significantly. The d-ROM in the C group without PS increased significantly in GPs while decreased significantly in old-aged rats. In addition, the BAP of the C group in GP and early adulthood were all significantly elevated. There were significant differences in organ weights between the C and PS groups at all growth stages. Oxidative stress and antioxidant capacity differed depending on the organism's developmental status and growth stage, and PS also showed different effects. In particular, the variability in oxidative stress was remarkable, suggesting that the effect of PS was more significant in the organism's immature organs.

Responses to oxidative stress and antioxidant capacity in rats at different growth stages.

[Purpose] Oxidative stress is regulated by antioxidant capacity in vivo. However, its impact on aging characteristics remains debatable. This study is first to report oxidative stress, antioxidant capacity, and their ratio in five age groups of rats, and aimed to provide basic data useful for disease prevention. [Materials and Methods] Sixty male Wistar rats of different ages were used as experimental animals, grouped as follows: weaned (three weeks), growth (eight weeks), adulthood (six months), middle-age (12 months), and old-age (24 months). To assess oxidative stress and antioxidant capacity, derivatives of reactive oxygen metabolites and biological antioxidant potential were measured. [Results] The lowest level of oxidative stress and the highest level of antioxidant capacity were observed during the weaning stage, and remarkable dynamic changes were observed until adulthood. The highest oxidative stress and lowest antioxidant capacity were observed in the old-age group. [Conclusion] In vivo oxidative stress and antioxidant capacity are largely reflected in the characteristics of aging, and this ratio is greatly influenced by the dynamics of oxidative stress and antioxidant capacity with age.

Comparison of Toxicities among Different Bumped Kinase Inhibitor Analogs for Treatment of Cryptosporidiosis.

Recent advances on the development of bumped kinase inhibitors for treatment of cryptosporidiosis have focused on the 5-aminopyrazole-4-carboxamide scaffold, due to analogs that have less hERG inhibition, superior efficacy, and strong in vitro safety profiles. Three compounds, BKI-1770, -1841, and -1708, showed strong efficacy in C. parvum infected mice. Both BKI-1770 and BKI-1841 had efficacy in the C. parvum newborn calf model, reducing diarrhea and oocyst excretion. However, both compounds caused hyperflexion of the limbs seen as dropped pasterns. Toxicity experiments in rats and calves dosed with BKI-1770 showed enlargement of the epiphyseal growth plate at doses only slightly higher than the efficacious dose. Mice were used as a screen to check for bone toxicity, by changes to the tibia epiphyseal growth plate, or neurological causes, by use of a locomotor activity box. These results showed neurological effects from both BKI-1770 and BKI-1841 and bone toxicity in mice from BKI-1770, indicating one or both effects may be contributing to toxicity. However, BKI-1708 remains a viable treatment candidate for further evaluation as it showed no signs of bone toxicity or neurological effects in mice.

Development of Two Mouse Models for Vaccine Evaluation against Cryptosporidiosis.

Cryptosporidiosis was shown a decade ago to be a major contributor to morbidity and mortality of diarrheal disease in children in low-income countries. A serious obstacle to develop and evaluate immunogens and vaccines to control this disease is the lack of well-characterized immunocompetent rodent models. Here, we optimized and compared two mouse models for the evaluation of vaccines: the Cryptosporidium tyzzeri model, which is convenient for screening large numbers of potential mixtures of immunogens, and the Cryptosporidium parvum-infected mouse pretreated with interferon gamma-neutralizing monoclonal antibody.

Baseline Body Composition and Physical Activity Level Recommended for Optimal Bone Mineral Density in Young Women.

Aim: This study examined the influence of body composition and physical activity level (PAL) on bone mineral density (BMD) to determine the baseline values necessary for maintaining healthy trabecular bone and improving bone health in young women. Materials and Methods: The subjects, consisting of healthy young women, were assigned to either a BMD-low (BMD-L) or BMD-high (BMD-H) group using the osteosonic index. PAL was measured for 1 week and rated on a scale from PAL-1 to 8 according to intensity levels (metabolic equivalents [METs]). The Wilcoxon rank-sum test was performed for intergroup comparisons. Results: The BMD-H group had significantly higher fat-free muscle mass, skeletal muscle index, and basic metabolic rate than the BMD-L group (p < 0.001, each). Regarding the timing of physical activity in daily life according to intensity, PAL-6 (p < 0.01), PAL-7 (p < 0.001), and PAL-8 (p < 0.01) for the BMD-H group were significantly longer than those for the BMD-L group. Discussion and Conclusion: For young women in their early 20s, BMD may be associated with baseline physical fitness and strength, as determined by body composition, but it is not influenced by the duration of physical activity. A PAL ≥6.0 METs may improve or maintain the effect on BMD.

Toe Clearance Rehabilitative Slippers for Older Adults With Fall Risk: A Randomized Controlled Trial.

INTRODUCTION: To evaluate fall-prevention rehabilitative slippers for use by self-caring, independent older adults. MATERIALS AND METHODS: This assessor-blinded, randomized, and controlled 1-year study included 59 self-caring, independent participants (49 women) who attended day services. The mean age of participants was 84.0 ± 5.3 years. Participants were randomly selected from 8 nursing homes. We tested slippers top-weighted with a lead bead (200, 300, or 400 g). Intervention group participants walked while wearing the slippers for 10-20 min, 1-3 days/week at the day service center. Fall risk was measured using the Berg Balance Scale and the Tinetti Performance-Oriented Mobility Assessment (POMA) before and at 3-month intervals after the intervention/control phase. RESULTS: After 12 months, the intervention group demonstrated significant improvement. Berg Balance and POMA compared to the control group (p < .05 p < .01, respectively). Mobility scores improved significantly for both measurements in the intervention group before and after (p < .01), but the control group had significantly lower scores. DISCUSSION: Overall, falls decreased in the intervention group from 10 to 7, and control group falls increased from 9 to 16 (p = .02). No adverse events related to the intervention were reported. CONCLUSIONS: Rehabilitation training slippers may reduce falls in older adults.

One health therapeutics: Target-Based drug development for cryptosporidiosis and other apicomplexa diseases.

This is a review of the development of bumped-kinase inhibitors (BKIs) for the therapy of One Health parasitic apicomplexan diseases. Many apicomplexan infections are shared between humans and livestock, such as cryptosporidiosis and toxoplasmosis, as well as livestock only diseases such as neosporosis. We have demonstrated proof-of-concept for BKI therapy in livestock models of cryptosporidiosis (newborn calves infected with Cryptosporidium parvum), toxoplasmosis (pregnant sheep infected with Toxoplasma gondii), and neosporosis (pregnant sheep infected with Neospora caninum). We discuss the potential uses of BKIs for the treatment of diseases caused by apicomplexan parasites in animals and humans, and the improvements that need to be made to further develop BKIs.

The Impact of Actotoxumab Treatment of Gnotobiotic Piglets Infected With Different Clostridium difficile Isogenic Mutants.

Nosocomial infections with Clostridium difficile are on the rise in the Unites States, attributed to emergence of antibiotic-resistant and hypervirulent strains associated with greater likelihood of recurrent infections. In addition to antibiotics, treatment with Merck anti-toxin B (TcdB) antibody bezlotoxumab is reported to reduce recurrent infections. However, treatment with anti-toxin A (TcdA) antibody actotoxumab was associated with dramatically increased disease severity and mortality rates in humans and gnotobiotic piglets. Using isogenic mutants of C. difficile strain NAPI/BI/027 deficient in TcdA (A-B+) or TcdB (A+B-), and the wild type, we investigated how and why treatment of infected animals with anti-TcdA dramatically increased disease severity. Contrary to the hypothesis, among piglets treated with anti-TcdA, those with A+B- infection were disease free, in contrast to the disease enhancement seen in those with wild-type or A-B+ infection. It seems that the lack of TcdA, through either deletion or neutralization with anti-TcdA, reduces a competitive pressure, allowing TcdB to freely exert its profound effect, leading to increased mucosal injury and disease severity.

Piperazine-Derivative MMV665917: An Effective Drug in the Diarrheic Piglet Model of Cryptosporidium hominis.

BACKGROUND: Cryptosporidiosis, an enteric protozoon, causes substantial morbidity and mortality associated with diarrhea in children <2 years old in low- to middle-income countries. There is no vaccine and treatments are inadequate. A piperazine-based compound, MMV665917, has in vitro and in vivo efficacy against Cryptosporidium parvum. In this study, we evaluated the efficacy of MMV665917 in gnotobiotic piglets experimentally infected with Cryptosporidium hominis, the species responsible for >75% of diarrhea reported in these children. METHODS: Gnotobiotic piglets were orally challenged with C hominis oocysts, and oral treatment with MMV665917 was commenced 3 days after challenge. Oocyst excretion and diarrhea severity were observed daily, and mucosal colonization and lesions were recorded after necropsy. RESULTS: MMV665917 significantly reduced fecal oocyst excretion, parasite colonization and damage to the intestinal mucosa, and peak diarrheal symptoms, compared with infected untreated controls. A dose of 20 mg/kg twice daily for 7 days was more effective than 10 mg/kg. There were no signs of organ toxicity at either dose, but 20 mg/kg was associated with slightly elevated blood cholesterol and monocytes at euthanasia. CONCLUSIONS: These results demonstrate the effectiveness of this drug against C hominis. Piperazine-derivative MMV665917 may potentially be used to treat human cryptosporidiosis; however, further investigations are required.

The piglet acute diarrhea model for evaluating efficacy of treatment and control of cryptosporidiosis.

Cryptosporidium spp. are ranked as the second leading pathogens causing life-threatening diarrhea in children under 2 years of age. Although Cryptosporidium hominis causes three quarters of the cases of cryptosporidiosis, studies on C. hominis are limited since natural disease due to C. hominis is host-restricted to humans only. In this mini-review, we demonstrate the successfully adoption, propagation, and utility of the C. hominis strain TU502, isolated originally from an infant with diarrhea in Uganda, in gnotobiotic piglets. The TU502 C. hominis strain and the gnotobiotic piglet model currently are the only available preclinical tools to evaluate therapeutics that specifically target C. hominis. Infection in this gnotobiotic piglet model displays similar clinical symptoms of diarrhea observed in humans. Here we further describe how this unique model of acute diarrhea, can be used for drug discovery and testing of vaccine candidates against cryptosporidiosis. The shared anatomical, physiological and immunological characteristics between piglets and human infants makes the model ideal for evaluating the efficacy of therapeutics and vaccines against cryptosporidiosis as they become available.

Therapeutic Efficacy of Bumped Kinase Inhibitor 1369 in a Pig Model of Acute Diarrhea Caused by Cryptosporidium hominis.

Recent reports highlighting the global significance of cryptosporidiosis among children have renewed efforts to develop control measures. We evaluated the efficacy of bumped kinase inhibitor (BKI) 1369 in the gnotobiotic piglet model of acute diarrhea caused by Cryptosporidium hominis, the species responsible for most human cases. Five-day treatment with BKI 1369 reduced signs of disease early during treatment compared to those of untreated animals. Piglets treated with BKI 1369 exhibited significant reductions of oocyst excretion, mucosal colonization by C. hominis, and mucosal lesions, which resulted in considerable symptomatic improvement. BKI 1369 reduced the parasite burden and disease severity in the gnotobiotic pig model. Together these data suggest that a BKI-mediated therapeutic may be an effective treatment against cryptosporidiosis.

The therapeutic efficacy of azithromycin and nitazoxanide in the acute pig model of Cryptosporidium hominis.

Recent reports highlighting the global significance of cryptosporidiosis among children, have renewed efforts to develop control measures. We have optimized the gnotobiotic piglet model of acute diarrhea to evaluate azithromycin (AZR), nitazoxanide (NTZ), or treatment with both against Cryptosporidium hominis, the species responsible for most human cases. Piglets, animals reproducibly clinically susceptible to C. hominis, when inoculated with 106 oocysts, developed acute diarrhea with oocyst excretion in feces within 3 days. Ten day-treatment with recommended doses for children, commencing at onset of diarrhea, showed that treatment with AZR or NTZ relieved symptoms early in the treatment compared with untreated animals. Piglets treated with AZR exhibited no reduction of oocyst excretion whereas treatment with NTZ significantly reduced oocyst shedding early, increasing however after 5 days. While treatment with AZR+NTZ led to considerable symptomatic improvement, it had a modest effect on reducing mucosal injury, and did not completely eliminate oocyst excretion. Doubling the dose of AZR and/or NTZ did not improve the clinical outcome, confirming clinical observations that NTZ is only partially effective in reducing duration of diarrhea in children. This investigation confirms the gnotobiotic piglet as a useful tool for drug evaluation for the treatment of cryptosporidiosis in children.

Silk Fibroin Microneedles for Transdermal Vaccine Delivery.

Microneedles represent an exciting departure from the existing parenteral injection paradigm for drug delivery, particularly for the administration of vaccines. While the benefit of delivering vaccine antigens to immunocompetent tissue in the skin has been established, there have been varying degrees of success using microneedles to do so. Here, we investigate the use of silk fibroin protein to produce microneedles and evaluate their ability to deliver vaccines against influenza, Clostridium difficile, and Shigella. Fibroin protein from the silkworm Bombyx mori possesses suitable properties for use in a microneedle system, including all-aqueous processing, mechanical strength in dried formats, biocompatibility, and the ability to temperature stabilize biomacromolecules. As such, this biomaterial combines the processing and biocompatibility advantages of a dissolving microneedle system with the product stability and mechanical strength of coated insoluble microneedles. Through successful vaccination of mice against three separate antigens, we establish that silk fibroin is well-suited for use as a solid-coated microneedle delivery system and offers long-term potential similar to that of the leading microneedle biomaterials.

The Influence of the Type of Continuous Exercise Stress Applied during Growth Periods on Bone Metabolism and Osteogenesis.

BACKGROUND: In this study, we examined the influence of exercise loading characteristics on bone metabolic responses and bone morphology in the growth phase and adulthood. METHODS: Running exercise (RUN) and jumping exercise (JUM) were used for the exercise loading in 28-day-old male Wistar rats. Bone metabolism was measured by blood osteocalcin (OC) and tartrate-resistant acid phosphatase (TRACP) levels. For bone morphology, the maximum bone length, bone weight, and bone strength of the femur and tibia were measured. RESULTS: A pre- and post-exercise loading comparison in the growth phase showed significantly increased OC levels in the RUN and JUM groups and significantly decreased TRACP levels in the JUM group. On the other hand, a pre- and post-exercise loading comparison in adulthood showed significantly decreased TRACP levels in the RUN and JUM groups. Femur lengths were significantly shorter in the RUN and JUM groups than in the control (CON) group, while bone weight was significantly greater in the JUM group than in the CON group. CONCLUSIONS: Exercise loading activates OC levels in the growth phase and suppresses TRACP levels in adulthood. On the other hand, these results suggest that excessive exercise loading may suppress bone length.

Continuous culture of Cryptosporidium parvum using hollow fiber technology.

Diarrheal disease is a leading cause of pediatric death in economically low resource countries. Cryptosporidium spp. are the second largest member of this group and the only member for which no treatment exists. One of the handicaps to developing chemotherapy is the lack of a reproducible long-term culture method permitting in vitro drug screening beyond 48 h. We have adapted the well-established hollow fiber technology to provide an environment that mimics the gut by delivering nutrients and oxygen from the basal layer upwards while allowing separate redox and nutrient control of the lumen for parasite development. Using this technique, oocyst production was maintained for >6 months, producing approximately 1×10(8)oocysts ml(-1)day(-1), compared with 48 h with a yield of 1×10(6)oocysts ml(-1) in two-dimensional cultures. Oocysts, after 4 and 20 weeks in culture, produced a chronic infection in a TCR-α-deficient mouse model. In vivo infectivity of oocysts was confirmed using oocysts from a 6 week culture in a dexamethasone immunosuppressed mouse model.

The immune response of two microbial antigens delivered intradermally, sublingually, or the combination thereof.

A key consideration to produce a successful vaccine is the choice of appropriate vaccination route. Though most vaccines are administered parenterally, this route is not effective in producing a robust mucosal or cell-mediated response. Intradermal and sublingual vaccinations have been explored recently as potential needle-free immunization strategies. We explored intradermal and sublingual routes as well as the combination of the two routes in eliciting both systemic and mucosal immune responses. Mice were immunized intradermally or sublingually with dmLT, a mutant of Escherichia coli heat-labile toxin. A systemic IgG response is dominant in intradermal immunization while a mucosal IgA response is dominant in sublingual immunization. When routes were combined, a synergistic response was seen with high titers of anti-dmLT IgG and IgA. IpaB/IpaD antigens of Shigella flexneri type III secretion system, were admixed with dmLT as adjuvant and administered by each route alone or in combination. Again, the intradermal route elicited a systemic response while the sublingual route elicited a mucosal response. When combined, the routes produced a robust synergistic response to both antigens that exhibited a balanced Th1/Th2 response. These results provide a new potential needle-free immunization strategy that will benefit low income countries and increase compliance in industrial countries.

Enhanced carboxymethylcellulase production by a newly isolated marine bacterium, Cellulophaga lytica LBH-14, using rice bran.

The aim of this work was to establish the optimal conditions for production of carboxymethylcellulase (CMCase) by a newly isolated marine bacterium using response surface methodology (RSM). A microorganism producing CMCase, isolated from seawater, was identified as Cellulophaga lytica based 16S rDNA sequencing and the neighborjoining method. The optimal conditions of rice bran, ammonium chloride, and initial pH of the medium for cell growth were 100.0 g/l, 5.00 g/l, and 7.0, respectively, whereas those for production of CMCase were 79.9 g/l, 8.52 g/l, and 6.1. The optimal concentrations of K2HPO4, NaCl, MgSO4·7H2O, and (NH4)2SO4 for cell growth were 6.25, 0.62, 0.28, and 0.42 g/l, respectively, whereas those for production of CMCase were 3.72, 0.54, 0.70, and 0.34 g/l. The optimal temperature for cell growth and the CMCase production by C. lytica LBH-14 were 35 degrees C and 25 degrees C, respectively. The maximal production of CMCase under optimized condition for 3 days was 110.8 U/ml, which was 5.3 times higher than that before optimization. In this study, rice bran and ammonium chloride were developed as carbon and nitrogen sources for the production of CMCase by C. lytica LBH-14. The time for production of CMCase by a newly isolated marine bacterium with submerged fermentations reduced to 3 days, which resulted in enhanced productivity of CMCase and a decrease in its production cost.

Sublingual immunization with an engineered Bacillus subtilis strain expressing tetanus toxin fragment C induces systemic and mucosal immune responses in piglets.

UNLABELLED: Sublingual (SL) and intranasal (IN) administration of a Bacillus subtilis-based tetanus vaccine was tested in piglets, which more closely mimic the human immune system than mice. Piglets were immunized by the SL, IN or oral routes with vaccine expressing tetanus toxin fragment C, or commercial tetanus vaccine given by intramuscular injection as a control. Tetanus toxoid specific ELISA and passive neutralization tests were used to measure IgG and IgA levels in serum and mucosal secretions, and assess protective serum antibodies, respectively. The nature of the immune response was explored by MHC Class II, TGF-ß1 expression, and ELISA assays for multiple cytokines. SL or IN immunization of piglets induced neutralizing tetanus toxoid specific serum antibody and local salivary and vaginal IgA responses. Standard tetanus vaccine resulted in systemic antibodies, whereas oral administration of the Bacillus-based vaccine was ineffective. Further analyses indicated a balanced Th1/Th2 response to SL or IN immunization. CONCLUSION: This study demonstrates for the first time that SL or IN administration is effective for inducing both systemic and mucosal responses in a piglet model, indicating that SL or IN delivery of a B. subtilis-based tetanus vaccine can be a simple, non-invasive, low cost strategy to induce immunity to tetanus.

AMPD3 is involved in anthrax LeTx-induced macrophage cell death.

The responses of macrophages to Bacillus anthracis infection are important for the survival of the host, since macrophages are required for the germination of B. anthracis spores in lymph nodes, and macrophage death exacerbates anthrax lethal toxin (LeTx)-induced organ collapse. To elucidate the mechanism of macrophage cell death induced by LeTx, we performed a genetic screen to search for genes associated with LeTx-induced macrophage cell death. RAW264.7 cells, a macrophage-like cell line sensitive to LeTx-induced death, were randomly mutated and LeTx-resistant mutant clones were selected. AMP deaminase 3 (AMPD3), an enzyme that converts AMP to IMP, was identified to be mutated in one of the resistant clones. The requirement of AMPD3 in LeTx-induced cell death of RAW 264.7 cells was confirmed by the restoration of LeTx sensitivity with ectopic reconstitution of AMPD3 expression. AMPD3 deficiency does not affect LeTx entering cells and the cleavage of mitogen-activated protein kinase kinase (MKK) by lethal factor inside cells, but does impair an unknown downstream event that is linked to cell death. Our data provides new information regarding LeTx-induced macrophage death and suggests that there is a key regulatory site downstream of or parallel to MKK cleavage that controls the cell death in LeTx-treated macrophages.