MANNOSE-BINDING LECTIN (MBL) INHIBITS SARS-CoV-2 INFECTION and REPLICATION in VITRO

Background: Humoral innate immunity consists of a limited, but diverse, set of humoral fluid phase pattern recognition molecules (PRMs) that represent a first line of resistance against microbial invaders by promoting pathogen disposal by phagocytosis, complement activation and inflammation. These factors encompass complement, ficolin, collectin and pentraxin family of proteins. Methods: We have analyzed the activity of PRMs for their potential capacity of inhibiting SARS-CoV-2 entry and replication into epithelial cells by a microneutralization assay based on a lentiviral particles pseudotyped with the SARS-CoV-2 spike protein in HEK293T cells overexpressing the angiotensin converting enzyme 2 (ACE2). Either SARS-CoV-2 or target cells were incubated with Mannose Binding Lectin (MBL, concentration range: 1-50 μ g/ml) to further characterize its anti-viral activity for 1 h prior to infection in both human Calu-3 cells and air-liquid interface cultures of human bronchial epithelial cells (HBEC). Binding experiments were carried out with SARS-CoV-2 Spike protein and recombinant MBL to further investigate its antiviral action. Results: Among 12 PRMs tested, only MBL inhibited viral entry in the pseudotyped neutralization assay. Furthermore, MBL protein inhibited SARS-CoV-2 viral replication in Calu-3 and HBEC by ca. one log10 at the top concentration (10 μ g/ml and 50 μ g/ml, respectively). MBL antiviral activity was confirmed also against alpha, beta and gamma SARS-CoV-2 variants of concern. Binding experiments showed that MBL specifically interacts with the trimeric form of SARS-CoV-2 spike. Conclusion: MBL binds to the Spike protein in its active trimeric conformation leading to the inhibition of SARS-CoV-2 infection and replication in vitro. These results suggest that MBL possesses an antiviral activity against SARS-CoV-2 that could bear therapeutic potential.

SARS-CoV-2 detection in primary thyroid sarcoma: coincidence or interaction?

INTRODUCTION: Thyroid dysfunctions associated with SARS-CoV-2 are emerging in scientific literature. During the second COVID-19 epidemic spread, we evaluated a patient with the suspect of subacute thyroiditis. METHODS AND RESULTS: Specimen from fine-needle aspiration of a hypoechoic undefined area was analyzed for cytology and for SARS-CoV-2 detection. SARS-CoV-2 was retrieved by real-time polymerase chain reaction on the cytologic sample, which was then cultured on Vero E6 cells and demonstrated to be cytopathic. Whole-genome sequence was deposited. Histological exam diagnosed a rare case of primary thyroid sarcoma with diffuse and strong expression of mouse double minute 2 homolog (MDM2) oncoprotein. Ultrastructural examination confirmed, in several neoplastic cells, the presence of viral particles in cytoplasmic vacuoles. CONCLUSIONS: In our hypothesis, SARS-CoV-2 and sarcoma coexistence could represent a synergistic interplay, ultimately favoring both viral persistence and tumor proliferation: the overexpression of MDM2 in tumor cells might have generated a favorable immunological niche for SARS-CoV-2 localization and, in turn, SARS-CoV-2 could have favored tumor growth by inducing MDM2-mediated p53 downregulation. Functional studies are needed to confirm this suggestive pathway.

Positive Parenting and Praise from primary caregivers to infants in the Context of a COVID-19 Pandemic

Positive parenting comprises the primary caregivers' competencies to provide affection and guarantee the child's safety, which favors the integral development of the infant. In relation to this, praise is positive feedback from the parents towards what the child does, having an impact on the child's behaviors Based on the influence of parenting practices on the mental health of families, it is relevant to study the relationship between Positive Parenting (Positive Parenting Scale;EP2) and Praise (Praise Scale) in Latin American primary caregivers of children. as from 0 to 36 months, specifically during the COVID-19 pandemic. A positive association was found between praise, positive parenting and the age of the infant. During the context of ASPO, it was found that 53.1% of primary caregivers are between the risk and monitoring zone with regard to parenting. From this, policies could be used to encourage the use of favorable praise and parenting skills, especially in the face of the COVID-19 pandemic.

Antepartum Distress during COVID-19 Pandemic: an Observational Study

BACKGROUND: The present study investigates the impact of the Coronavirus diseases 2019 (Covid-19) pandemic on the subjective experience of pregnant women, as well as the impact of the pandemic on this population in terms of psychopathological correlates. SUBJECTS AND METHODS: Pregnant women referring to the Section of Obstetrics and Gynecology of the General Hospital of Perugia, Italy, were recruited from 1st May, 2021 to 15th June, 2021. Socio-demographic and clinical data was collected, as well as information regarding the Covid-19 pandemic impact on the subjective experience of pregnancy. Psychopathology was evaluated by means of the State-Trait Anxiety Inventory Form Y (STAI-Y), the Symptom Checklist-90 (SCL-90) and the Prenatal Distress Measure (Pre-DM). Descriptive analyses were performed. Significant associations between distress symptoms and the collected sociodemographic and clinical variables were assessed by using the Pearson correlation (p<0.05). RESULTS: 25 women were included in the study. Among these, 18 (72%) reported that the Covid-19 pandemic negatively impacted their experience of pregnancy. Were detected an average Pre-DM total score of 7.28+/-4.33 and an average state anxiety scale value of 35.56+/-9.21 and an average trait anxiety scale value of 34.04+/-7.44 at the STAI-Y. A global severity index > 1 at SCL-90 was detected in 8.3% of the sample. CONCLUSIONS: The identification of antepartum distress and the early treatment of perinatal psychopathology represent a priority during the Covid-19 pandemic era.

The efficacy of ultraviolet light-emitting technology against coronaviruses: a systematic review.

The ongoing pandemic of COVID-19 has underlined the importance of adopting effective infection prevention and control (IPC) measures in hospital and community settings. Ultraviolet (UV)-based technologies represent promising IPC tools: their effective application for sanitation has been extensively evaluated in the past but scant, heterogeneous and inconclusive evidence is available on their effect on SARS-CoV-2 transmission. With the aim of pooling the available evidence on the efficacy of UV technologies against coronaviruses, we conducted a systematic review following PRISMA guidelines, searching Medline, Embase and the Cochrane Library, and the main clinical trials' registries (WHO ICTRP, ClinicalTrials.gov, Cochrane and EU Clinical Trial Register). Quantitative data on studies' interventions were summarized in tables, pooled by different coronavirus species and strain, UV source, characteristics of UV light exposure and outcomes. Eighteen papers met our inclusion criteria, published between 1972 and 2020. Six focused on SARS-CoV-2, four on SARS-CoV-1, one on MERS-CoV, three on seasonal coronaviruses, and four on animal coronaviruses. All were experimental studies. Overall, despite wide heterogenicity within included studies, complete inactivation of coronaviruses on surfaces or aerosolized, including SARS-CoV-2, was reported to take a maximum exposure time of 15 min and to need a maximum distance from the UV emitter of up to 1 m. Advances in UV-based technologies in the field of sanitation and their proved high virucidal potential against SARS-CoV-2 support their use for IPC in hospital and community settings and their contribution towards ending the COVID-19 pandemic. National and international guidelines are to be updated and parameters and conditions of use need to be identified to ensure both efficacy and safety of UV technology application for effective infection prevention and control in both healthcare and non-healthcare settings.