Human Cardiac Pericytes Are Susceptible to SARS-CoV-2 Infection

COVID-19 is associated with serious cardiovascular complications, with incompletely understood mechanism(s). Pericytes have key functions in supporting endothelial cells and maintaining vascular integrity. We demonstrate that human cardiac pericytes are permissive to SARS-CoV-2 infection in organotypic slice and primary cell cultures. Viral entry into pericytes is mediated by endosomal proteases, and infection leads to up-regulation of inflammatory markers, vasoactive mediators, and nuclear factor kappa-B-dependent cell death. Furthermore, we present evidence of cardiac pericyte infection in COVID-19 myocarditis patients. These data demonstrate that human cardiac pericytes are susceptible to SARS-CoV-2 infection and suggest a role for pericyte infection in COVID-19.

Physiological Correlates of Maternal Responsivity in Mothers of Preschoolers With Fragile X Syndrome

The present study examined the relationship between salivary cortisol and maternal responsiveness in mothers of boys with fragile X syndrome (FXS). Maternal responsivity is strongly associated with child outcomes, and children with FXS are at risk for compromised development due to intellectual disability and problem behavior. Increased understanding of the nature and underlying mechanisms of maternal responsivity in FXS is important to optimize outcomes in children with FXS and contribute to improved family cohesion. Data from 36 mother-child dyads indicated a complex age effect with elevated cortisol levels associated with high maternal responsivity scores when children are young and low responsivity scores when children are older. Implications of these findings and directions for future research are discussed.

Functional analysis and treatment of problem behavior exhibited by children with fragile X syndrome

The efficacy of function-based interventions for the treatment of severe problem behavior exhibited by individuals with intellectual and developmental disabilities (IDD) is well established. However, few studies have reported on behavioral interventions in fragile X syndrome (FXS) specifically. The present study is a consecutive case-series analysis that reports on functional analysis and treatment of problem behavior of nine children with FXS. Assessment findings were consistent with previous research indicating that among individuals with FXS, problem behavior is more commonly maintained by escape from demands and access to tangible items, relative to the broader population of individuals with IDD. Functional analysis-based behavioral interventions resulted in a mean reduction in problem behavior of 95.2% across the nine participants. Additionally, generalization of treatment effects from controlled clinical settings to home, school, and community was demonstrated. The current findings suggest that function-based behavioral interventions shown to be effective with the broader population of individuals with IDD are also effective for individuals with FXS. Our results in combination with those of previous studies describing functional analysis outcomes provide additional evidence for a unique functional behavioral phenotype for severe problem behavior in individuals with FXS. Implications of study findings for early intervention and prevention of problem behavior in children with FXS are discussed.

Oral manifestations of human immunodeficiency virus (HIV)-infected patients in Singapore

INTRODUCTION

Oral lesions have been recognised as prominent features of acquired immune deficiency syndrome (AIDS) and human immunodeficiency virus (HIV) infection since the beginning of the epidemic.

OBJECTIVE

This descriptive study was conducted to study the types of oral lesions among HIV-infected patients in Singapore.

MATERIALS AND METHODS

Oral examination was done on 81 randomly selected HIV-infected patients attending the specialist outpatient clinic at the Communicable Disease Centre.

RESULTS

A total of 9 different lesions were observed in 45 (56%) patients. The lesions observed were oral candidosis (35%), periodontal disease (16%), aphthous-like ulcers (5%), oral hairy leukoplakia (5%) and lymphoma (1%).

CONCLUSION

The oral manifestations of HIV-infected patients in Singapore appear to be less frequent in comparison with those patients from Africa and Europe. Similarities in oral findings among the HIV-infected patients in Asia are evident with a notable lack of oral Kaposi's sarcoma (KS) and a low prevalence of non-Hodgkin's lymphoma and oral hairy leukoplakia.