Πέμπτη 4 Αυγούστου 2022

Effects of boosted mRNA and adenoviral‐vectored vaccines on immune responses to omicron BA.1 and BA.2 following the heterologous CoronaVac/AZD1222 vaccination

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Abstract

Introduction

The coronavirus 2019 omicron variant has surged rapidly and raises concerns about immune evasion even in individuals with complete vaccination because it harbors mutations. Here, we examine the capability of booster vaccination following CoronaVac/AZD1222 prime to induce neutralizing antibodies (NAbs) against omicron (BA.1 and BA.2) and T-cell responses.

Methods

A total of 167 participants primed with heterologous CoronaVac/AZD1222 for 4-5 months were enrolled to receive AZD1222, BNT162b2, or mRNA-1273 as a third dose. Reactogenicity was recorded. Immunogenicity analyses of SARS-CoV-2 binding antibodies were measured using ELISA. The neutralizing antibody (NAb) titers against omicron BA.1 and BA.2 were determined using the focus reduction neutralization test (FRNT50) and total interferon-gamma (IFN-γ) responses were measured to observe the T cell activation.

Results

A substantial loss in neutralizing potency to omicron variant was found at 4 to 5 months after receiving the heterologous CoronaVac/AZD1222. Following booster vaccination, a significant increase in binding antibodies and neutralizing activities toward delta and omicron variants was observed. Neutralization to omicron BA.1 and BA.2 were comparable, showing the highest titers after boosted mRNA-1273 followed by BNT162b2 and AZD1222. In addition, individuals boosted with mRNA vaccines develop a T cell response to spike protein while those boosted with AZD1222 did not. Reactogenicity was mild to moderate without serious adverse events.

Conclusions

Our findings demonstrated that mRNA booster vaccination is able to overcome waning immunity to provide antibodies that neutralize omicron BA.1 and BA.2, as well as a T cell response.

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An involvement of COX and 5‐LOX pathways in the penicillin‐ and pentylenetetrazole (PTZ)‐induced epilepsy models

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Abstract

Purpose

This study aimed to examine the relationship between epilepsy and COX/5-LOX inflammation pathways in the penicillin and pentylenetetrazole (PTZ)-induced epilepsy models.

Methods

For this purpose, forty-two albino male Wistar rats were used in this study. In the penicillin and PTZ-induced epilepsy models, epileptiform activity was induced by injection of penicillin (500 IU, i.c) and PTZ (35 mg/kg, i.p, three times a week), respectively. Licofelone (20 mg/kg, i.p), a dual inhibitor of COX/5-LOX, and esculetin (20 mg/kg, i.p), a 5-LOX inhibitor, were given. In the penicillin-induced epilepsy model, ECoG activity was recorded for 180 min. In the PTZ-induced epilepsy model, both ECoG activity was recorded and behavioral parameters were performed.

Results

In the penicillin groups, both licofelone and esculetin decreased the mean spike frequency and amplitude during the experiments. In the PTZ groups, licofelone (20 mg/kg, i.p) was more effective than esculetin (20 mg/kg, i.p). Licofelone showed its protective effects both in ECoG activity and in behavioral parameters. Esculetin was less effective when compared to licofelone.

Conclusion

The electrophysiological and behavioral data from the present study indicated that inflammation pathways might have a crucial role in controlling epileptiform activity in rats. Licofelone might be a valuable candidate in advanced studies.

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Prognostic capacity of the transcriptional expression of lactate dehydrogenase A in patients with head and neck squamous cell carcinoma

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Abstract

Background

To analyze the relationship between the transcriptional expression of lactate dehydrogenase A (LDHA) and the disease control in patients with a head and squamous cell carcinoma (HNSCC).

Methods

We determined the transcriptional expression of LDHA in 110 HNSCC patients treated with surgery.

Results

Five-year disease-free survival for patients with a high transcriptional expression of LDHA (n = 51) was 39.2% (95% confidence interval [CI]: 25.3%–53.1%), and for patients with a low expression (n = 59), it was 63.6% (95% CI: 51.1%–76.1%) (p = 0.004). According to the results of a multivariate analysis, patients with a high transcriptional expression of LDHA had a 3.4-fold increased risk of tumor recurrence. Patients with a high transcriptional expression of LDHA tended to show a higher intensity of immunohistochemical expression of LDHA at the tumor cells (p = 0.086).

Conclusion

In HNSCC patients treated with surgery, a high transcriptional expression of LDHA was associated with a significant decrease in disease-free survival.

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Epstein-Barr Virus–Positive Plasma Cell Neoplasm of Nasal Cavity in an Immunocompetent Adult

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jamanetwork.com

This case report describes patient in their 40s with a medical history of sleep apnea and diabetes and no history of immunosuppression who presented with left-sided nasal obstruction for 1 year and was found to have an Epstein-Barr virus–positive plasmacytoma.
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Survival and complications of implant‐supported cantilever fixed dental prostheses with zirconia and metal frameworks: A retrospective cohort study

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Abstract

Background

Current evidence about long-term survival of all-ceramic implant-supported cantilever fixed dental prostheses (cFDP) is limited.

Purpose

To evaluate the survival and complication rates of all-ceramic and metal–ceramic implant-supported cFDPs located in anterior and posterior sites, under consideration of risk factors.

Methods of study

The retrospective analysis compared an experimental group (75 implant-supported cFDPs among 48 patients [mean age 60.47 ± 9.25 years; 21 men]; mean observation period 3.56 years) with a control group (300 implant-supported non-cantilever FDPs [ncFDP] among 241 patients [mean age 62.85 ± 10.72 years; 109 men]; mean observation period 7.25 years). Kaplan–Meier estimates were used to describe the long-term survival and success of both groups. Log-rank tests were used for group comparisons. Mixed-effects Cox proportional hazards regression models were used to examine the effects of restoration- and site-specific risk factors. A random intercept was included in the models to take multiple FDPs per patient into account.

Results

Five-year cumulative survival until loss of restoration was 97.1% (95% confidence interval [CI] 0.93–1.00) for cFDPs and 97.0% (95% CI 0.95–0.99) for ncFDPs. Ten-year survival was 93.7% (95% CI 0.86–1.00) for cFDPs and 92.8% (95% CI 0.87–0.98) for ncFDPs, no difference between the survival curves of these groups was observed. Success differed between cFDPs and ncFDPs (p Log  = 0.002), zirconia and metal frameworks (p Log  < 0.001), and provisional and definitive cements (p Log  = 0.025). The effects of the variables "framework material" and "attachment method" were confirmed in a mixed-effects Cox regression model. Loss of retention was the predominant complication for both cFDPs and ncFDPs and usually affected provisionally cemented FDPs.

Conclusions

cFDPs do not differ from ncFDPs with regard to long-term failure, whereas additional complications were higher for cFDPs. Fewer complications were observed for zirconia frameworks without occlusal veneers and definitive cemented FDPs.

Clinical trial registration: the trial has no registration number because it commenced before January 31, 2017.

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Does the presence of third molars during sagittal split mandibular ramus osteotomy favour complications? Systematic review and meta-analysis

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The aim of this systematic review and meta-analysis was to assess whether the presence of inferior third molars during sagittal split mandibular ramus osteotomy increases the risk of intraoperative and postoperative complications. The PRISMA protocol was followed in this study, and the review was registered in the PROSPERO database (CRD42020147642). A search was conducted in the MEDLINE (PubMed), Web of Science, Cochrane Central, and Scopus databases on November 1, 2021. Nineteen articles were included, and the variables analysed were unfavourable fractures, infection, neurosensory disturbance, removal of osteosynthesis material, and duration of surgery. (Source: International Journal of Oral and Maxillofacial Surgery)
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