Shriners Hospitals for Children - Galveston

About: Shriners Hospitals for Children - Galveston is a healthcare organization based out in Galveston, Texas, United States. It is known for research contribution in the topics: Burn injury & Lean body mass. The organization has 249 authors who have published 420 publications receiving 15311 citations.

Rat MYH, a glycosylase for repair of oxidatively damaged DNA, has brain‐specific isoforms that localize to neuronal mitochondria

Abstract: Mitochondrial genomes are exposed to a heavy load of reactive oxygen species (ROS) that damage DNA. Since in neurons, mitochondrial DNA integrity must be maintained over the entire mammalian life span, neuronal mitochondria most likely repair oxidatively damaged DNA. We show that the Escherichia coli MutY DNA glycosylase homolog (MYH) in rat (rMYH) involved in repair of oxidative damage is abundantly expressed in the rat brain, with isoforms that are exclusive to brain tissue. Confocal microscopy and western analyses reveal localization of rMYH in neuronal mitochondria. To assess involvement of MYH in the neuronal response to oxidative DNA damage, we used a rat model of respiratory hypoxia, in which acutely reduced blood oxygenation leads to generation of superoxide, and formation and subsequent removal of 8-hydroxy-2'-deoxyguanosine (8OHdG). Removal of 8OHdG is accompanied by a spatial increase in rMYH immunoreactivity in the brain and an increase in levels of one of the three mitochondrial MYH isoforms, suggesting that inducible and non-inducible MYH isoforms exist in the brain. The mitochondrial localization of oxidative DNA damage repair enzymes in neurons may represent a specialized neuronal mechanism that safeguards mitochondrial genomes in the face of routine and accidental exposures to heavy loads of injurious ROS.

Contemporary Burn Survival

Abstract: Background The standard of burn treatment today reflects major advances. We sought to quantitate the impact of these advances on burn survival via age-stratified mortality ratios compared with other reported mortality analyses in burns. Study Design Age, percent of the total body surface area (TBSA) burned, presence of inhalation injury, length of stay, and survival status were recorded at admission and at discharge for all new burn admissions between 1989 and 2017. The expected mortality probability was calculated using historical multiple regression techniques and compared with observed data. We developed a prediction model for our observed data. Results Between 1989 and 2017, there were 10,384 consecutive new burn admissions, with 355 mortalities (median age, 13 years; median percent TBSA burn, 11%). We saw a significant decrease in our observed mortality data compared to historical predictions (p x /(1 + e x ) where x = –6.44 – 0.12 age + 0.0042 age 2 – 0.0000283 age 3 + 0.0499 TBSA + 1.21 Inhalation Injury + 0.015 third degree TBSA. Conclusions The reduction in mortality over time may be attributed to successful changes in standard of care protocols in the burn center that improved the outlook for burned individuals, including protocols for management of inhalation injury, nutrition, resuscitation, and early excision and grafting.

Perceived stigmatization and social comfort: validating the constructs and their measurement among pediatric burn survivors.

Abstract: Objective The current study implemented a four-step process to evaluate the measurement properties of the Perceived Stigmatization Questionnaire (PSQ) and the Social Comfort Questionnaire (SCQ) among long-term pediatric burn survivors. Methods First, a series of confirmatory factor analyses (CFAs) compared the hypothesized four-factor model--3 perceived stigmatization factors (absence of friendly behavior, confused and staring behavior, and hostile behavior)--and one social comfort factor to three other models. Second, we tested the measurement invariance of the instruments between pediatric and adult burn survivor samples. Third, possible differences in structural parameters across groups were tested. Fourth, we tested whether the three perceived stigmatization factors and the social comfort factor loaded on one second-order factor. Participants included 369 pediatric and 347 adult burn survivors. Results The four-factor model was superior to the comparison models. The PSQ and SCQ demonstrated measurement invariance. Factor variance, factor covariance, and the latent means of the PSQ did not vary across groups. The adult group had a significantly lower latent mean on the SCQ than the pediatric group. The three factors of the PSQ and the one-factor SCQ loaded on one second-order factor. Conclusion The results of this study lend support to both the construct validity of perceived stigmatization and social comfort and the potential value of the PSQ and SCQ for studying the social experience of people with visible differences.

Prophylactic Treatment with Fms-Like Tyrosine Kinase-3 Ligand after Burn Injury Enhances Global Immune Responses to Infection

Abstract: Severely burned patients are susceptible to infections with opportunistic organisms due to altered immune responses and frequent wound contamination. Immunomodulation to enhance systemic and local responses to wound infections may be protective after burn injury. We previously demonstrated that pretreatments with fms-like tyrosine kinase-3 (Flt3) ligand (Flt3L), a dendritic cell growth factor, increase the resistance of mice to a subsequent burn injury and wound infection by a dendritic cell-dependent mechanism. This study was designed to test the hypothesis that Flt3L administration after burn injury decreases susceptibility to wound infections by enhancing global immune cell activation. Mice were treated with Flt3L after burn injury and examined for survival, wound and systemic bacterial clearance, and immune cell activation after wound inoculation with Pseudomonas aeruginosa. To gain insight into the local effects of Flt3L at the burn wound, localization of Langerhans cells was examined. Mice treated with Flt3L had significantly greater numbers of CD25-expressing T cells and CD69-expressing T and B cells, neutrophils, and macrophages after, but not before, infection. Overall leukocyte apoptosis in response to infection was decreased with Flt3L treatment. Survival and local and systemic bacterial clearance were enhanced by Flt3L. Langerhans cells appeared in the dermis of skin bordering the burn wound, and further increased in response to wound infection. Flt3L augmented the appearance of Langerhans cells in response to both injury and infection. These data suggest that dendritic cell enhancement by Flt3L treatments after burn injury protects against opportunistic infections through promotion of local and systemic immune responses to infection.