13-Weeks subchronic toxicity of isoquercitrin-γ-cyclodextrin (IQC-γCD) molecular inclusion complex in Sprague-Dawley rats

Flavonoids such as quercetin and its glycoside Isoquercitrin and are abundantly present in the diet and have various pharmacological effects. However, limited data about its potential toxicity is available. In this study, we aim to evaluate the subchronic toxicity of the isoquercitrin-γ-cyclodextrin (IQC-γCD) molecular inclusion complex (SunActive® QCD/EN) in Sprague-Dawley (SD) rats. The IQC-γCD was administrated orally to 40 male and 40 female SD rats at dietary doses up to 5.0 % for 13 consecutive weeks. During the experiment periods, the general clinical signs, mortality, hematological, urinalysis values, biochemical, and histopathological parameters were examined. All animals survived until the scheduled necropsy, and no statistically significant or clinical sign of toxicologically relevant differences including pathology parameters, and histopathological endpoints were observed in any of the IQC-γCD treatment groups, compared with the control group. However, certain observations were noted in the male rats treated with the highest concentration (5.0 %), but these were not seen in female rats. A slight inhibition of weight gain was observed, probably linked to a fall in red blood cells, and hematocrit index in female rats. Statistically significant changes were noted in some clinical measures, such as plasma bilirubin level, alkaline phosphatase total bile acid without evidence of systemic clinical toxicity. The results support no observed adverse effect level (NOAEL) of IQC-γCD of 5.0 % in the diet for males (3338.55 mg/kg/day), and 3.0 % in the diet for females (2177.33 mg/kg/day) SD rats. Therefore, in this 13 weeks repeated-dose SD rat study there were no treatment-related adverse clinical or pathological findings for IQC-γCD of 5.0 % in the diet for males, and 3.0 % in the diet for females SD rats. The results of the present study support the safe use of IQC-γCD as a functional food, food additive, and natural ingredient.

Replication and extension of a model predicting response to psilocybin

BACKGROUND

Recent research demonstrated the potential of psychedelic drugs as treatment for depression and death-related anxiety and as an enhancement for well-being. While generally positive, responses to psychedelic drugs can vary according to traits, setting, and mental state (set) before and during ingestion. Most earlier models explain minimal response variation, primarily related to dosage and trust, but a recent study found that states of surrender and preoccupation at the time of ingestion explained substantial variance in mystical and adverse psilocybin experiences.

OBJECTIVES

The current study sought to replicate the previous model, extend the model with additional predictors, and examine the role of mystical experience on positive change.

METHOD

A hierarchical regression model was created with crowdsourced retrospective data from 183 individuals who had self-administered psilocybin in the past year. Scales explored mental states before, during, and after psilocybin ingestion, relying on open-ended memory prompts at each juncture to trigger recollections. Controlled drug administration was not employed.

RESULTS

This study replicated the previous model, finding a state of surrender before ingestion a key predictor of optimal experience and preoccupation a key predictor of adverse experience. Additional predictors added to the explanatory power for optimal and adverse experience. The model supported the importance of mystical experiences to long-term change.

CONCLUSION

Mental states of surrender or preoccupation at the time of ingestion explain variance in mystical or adverse psilocybin experiences, and mystical experiences relate to long-term positive change. The capacity to recognize this optimal preparatory mental state may benefit therapeutic use of psilocybin in clinical settings.

Testing a model of family caregivers' perceptions of elder behavior two weeks posthospitalization on caregiver response and health

The purpose of this study was to examine the effect of family caregivers' perceptions of elders' behaviors on caregiver burden and health while controlling for other factors often associated with burden. The model tested included the following concepts: elders' health, caregivers' perceptions of elder behaviors, caregiving involvement, coping, discrepancy in social support, caregiver response and caregiver health. Data for the analyses were obtained from a longitudinal study of 346 elder/caregiver dyads in which the elders had been hospitalized for acute episodes of chronic conditions. The sample for these analyses consisted of a subset of 118 dyads from the longitudinal project. A structural equation approach using the computer software Linear Structural Relations (LISREL) was used in analyzing the data. The findings indicated that the data fit reasonably well with some of the general patterns hypothesized in the model; the Goodness of Fit Index was 0.85 and the Tucker-Lewis Fit index, .88. More important than overall fit were specific relationships. Caregivers' perception of elders' behaviors was directly linked with caregiving response two weeks postdischarge; caregiver response directly linked with caregiver health at two weeks postdischarge but not at two months postdischarge. The findings provide support for Lazarus and Folkman's theory that appraisal of the situation influences response.

Testing a model for posthospital transition of family caregivers for elderly persons

The purpose of this study was to test a model of factors influencing family caregivers' responses and health outcomes during the 2-month period following an elder's discharge from the hospital for acute episodes of chronic illness. The elder's average age was 72.3 years. The average age of caregivers, 63% of whom were spouses of the elder, was 61 years. A longitudinal design was used for this study. Data were collected from 346 elder/caregiver dyads the day before discharge and at 2 weeks and 2 months postdischarge. Structural equation analysis was used to evaluate the conceptual model. The findings suggest that the model fits the data with an overall Goodness of Fit Index of .80.

Using Structured Controversy to Promote Ethical Decision Making

This article describes the use of structured controversy as an educational strategy for helping students learn content and skills needed for dealing with difficult ethical situations that arise during the practice of nursing. Structured controversy, an innovative technique that encourages learners to deal with conflict constructively, is described, and research validating its benefits is reviewed. A comprehensive description of how structured controversy was operationalized, using the issue of whether or not to give nutrition and hydration to a dying patient, is included to provide other nursing educators with an illustration of how this strategy can be applied.

The relation between popularity and achievement: a longitudinal test of the lateral transmission of value hypothesis

Data from a longitudinal study of school desegregation were used to examine the relation between normative social influence processes and academic achievement in order to test theoretical models of how school desegregation produces benefit. Subjects were white, Mexican-American, and black elementary school children who were measured once prior to and twice after desegregation of their schools. For all groups, analyses using structural equation techniques showed that, contrary to the lateral transmission of values hypothesis, which views social influence processes as shaping academic achievement, "causal influence" did not flow from social acceptance to academic achievement; instead, achievement appeared to affect subsequent social acceptance.

The relation between popularity and achievement: A longitudinal test of the lateral transmission of value hypothesis

Data from a longitudinal study of school desegregation were used to examine the relation between normative social influence processes and academic achievement in order to test theoretical models of how school desegregation produces benefit. Subjects were white, Mexican-American, and black elementary school children who were measured once prior to and twice after desegregation of their schools. For all groups, analyses using structural equation techniques showed that, contrary to the lateral transmission of values hypothesis, which views social influence processes as shaping academic achievement, "causal influence" did not flow from social acceptance to academic achievement; instead, achievement appeared to affect subsequent social acceptance.

Concomitant appearance of antibodies to two viruses in cerebrospinal fluid of an infant with acute encephalitis

Acute encephalitis developed in a 5 1/2-month-old infant with a previous history of uncomplicated measles at 4 months of age. The patient survived his acute illness with resultant severe neurological sequelae. The serum complement fixing antibody titer for herpes simplex virus in the early phase of the illness was less than 1:4, and increased significantly to 1:64 in the convalescent phase. Antibody was also demonstrated in the cerebrospinal fluid. Antimeasles antibody was found in the cerebrospinal fluid in the early convalescent stage and remained at a detectable level for at least 1 month. Moreover, at least 71% of the total protein in the cerebrospinal fluid was IgG. Although brain biopsy for viral isolation was not performed, the most probable diagnosis was herpes simplex virus encephalitis, and the concomitant appearance of measles antibody in the cerebrospinal fluid may have been due to leakage of measles antibody from the blood into the cerebrospinal fluid due to disturbance of the blood-brain barrier.

A simple method for the measurement of low levels of serum IgE

A simple method for the estimation of low serum IgE levels is presented. Radioimmunoassay often gives falsely high values because of the presence of non-specific factors in the serum when an excessive amount of serum is used in order to measure low serum IgE levels. Therefore the serum sample has to be diluted to minimize the influence of the non-specific factors and the lowest IgE level measurable in the serum is about 5 u/ml. In this study, pretreatment of the serum with cellulose powder was found to remove the non-specific factors that yield falsely high values. These factors were adsorbed almost completely onto cellulose powder when the serum IgE level was less than 100 u/ml. Thus, low serum IgE levels could be determined by radioimmunoassay using a sufficient amount of serum pretreated by cellulose powder. The lowest serum IgE level measurable by this method was as low as 0.5 u/ml and the low IgE level in neonatal serum could be determined with sufficient accuracy. By this method the geometric level of IgE in cord serum was 2.45 u/ml with a +/- 2 standard deviations range of 1.04 to 5.80 u/ml.