Immune function after hemorrhagic shock (shock) and subsequent sepsis is proofed to be sex- and age-related, showing an enhanced immune function and better survival of young females and a deteriorating immune response in advanced age. However, it remains unclear if the observed sex- and age-related effects observed on the immune function mirror the histomorphological changes of the affected organs. To scrutinize a possible association, male and female CBA/J mice (young, 2-3 months; aged 18-19 months) were subjected to shock (35 + 5 mmHg for 90 min and fluid resuscitation) or sham operation. At 48 h after shock, histological specimen at definite sites were harvested (lung, small bowel, liver, and kidney) and immediately stored in 10% formalin. After paraffin embedding, hematoxylin-eosin stain and immunohistochemical stains (vascular cell adhesion molecule 1 [VCAM-1], cluster of differentiation 44 [CD44], signal transducers and activators of transcription 3 [STAT-3]) were performed. In both sexes, aged animals developed significantly increased (P < 0.05) tissue damage in all analyzed organs compared with young mice. Sex differences were noticed in the lungs of young mice, showing a significantly (P < 0.05) lower organ damage score in female animals. Sex-related differences were found for VCAM-1 and cluster of differentiation 44 expression, whereas age-related changes were observed for STAT-3. These results demonstrate that the severity of tissue damage caused by hemorrhagic shock is influenced by sex- and age-related effects. Variances in the VCAM-1 and STAT-3 expression suggest that improved immune function in female and young subjects may be responsible for less shock-induced tissue damage.
Impulsive choice in humans is typically measured using hypothetical delays and rewards. In two experiments, we determined how experiencing the delay and/or the reward affected impulsive choice behavior. Participants chose between two amounts of real or hypothetical candy (M&Ms) after a real or hypothetical delay (5–30 s), where choosing the shorter delay was the impulsive choice. Experiment 1 compared choice behavior on a real-delay, real-reward (RD/RR) task where participants received M&Ms after experiencing the delays versus a real-delay, hypothetical-reward (RD/HR) task where participants accumulated hypothetical M&Ms after experiencing the delays. Experiment 2 compared the RD/HR task and a hypothetical-delay, hypothetical-reward (HD/HR) task where participants accumulated hypothetical M&Ms after hypothetical delays. The results indicated that choices did not differ between real and hypothetical M&Ms (Experiment 1), and participants were less sensitive to delay and more larger-later (LL)-preferring with hypothetical delays compared to real delays (Experiment 2). Experiencing delays to reward may be important for modeling real-world impulsive choices where delays are typically experienced. These novel experiential impulsive choice tasks may improve translational methods for comparison with animal models and may be improved procedures for predicting real-life choice behavior in humans.
Introduction. Children in rural areas face increased rates of obesity compared to their urban counterparts, and diet in early childhood may influence the development of diseases related to food intake. This study sought to determine current diet of children 0-23 months of age in rural Kansas. Methods. Medical students participating in summer rural clinical experiences offered the survey to caregivers of children 0-23 months, born at term as singletons without a specialized diet. Recruitment occurred at appointments over 6 weeks in primary care offices. The survey was in the style of a validated Food Frequency Questionnaire for infants with an image for estimating portion sizes. Diets were compared to guidelines set by the Dietary Guidelines for Americans, 2020-2025. Results. Of 44 participants in the study, there were 21 children aged 0-5 months, 7 aged 6-11 months, and 16 aged 12-23 months. Breastfeeding rates were nearly double reported national averages. All children in the 0 to 5 month age group met guidelines. None of the children 6 to 11 months or 12 to 23 months met guidelines. In the 6 to 11 month group, 4 consumed food in addition to breastmilk or formula (complementary foods). In the 12-23 month group, protein and dairy foods were lower than, and whole grains and vegetables were higher than, reported national averages respectively. Conclusions. Children may fall short of dietary recommendations due to the amounts and types of food complementary to breast milk received in the diet.
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