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  1. Article ; Online: True or false: what are the factors that influence COVID-19 diagnosis by RT-qPCR?

    Benevides Lima, Luina / Mesquita, Felipe Pantoja / Brasil de Oliveira, Lais Lacerda / Andréa da Silva Oliveira, Francisca / Elisabete Amaral de Moraes, Maria / Souza, Pedro F N / Montenegro, Raquel Carvalho

    Expert review of molecular diagnostics

    2022  Volume 22, Issue 2, Page(s) 157–167

    Abstract: Introduction: The Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) disease has had a catastrophic impact on the world resulting in several deaths. Since World Health Organization declared the pandemic status of the disease, several molecular ...

    Abstract Introduction: The Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) disease has had a catastrophic impact on the world resulting in several deaths. Since World Health Organization declared the pandemic status of the disease, several molecular diagnostic kits have been developed to help the tracking of viruses spread.
    Areas covered: This review aims to describe and evaluate the currently reverse transcriptase-quantitative polymerase chain reaction (RT-qPCR) diagnosis kit. Several processes used in COVID-19 diagnostic procedures are detailed in further depth to demonstrate optimal practices. Therefore, we debate the main factors that influence the viral detection of SARS-COV-2 and how they can affect the diagnosis of patients.
    Expert opinion: Here is highlighted and discussed several factors that can interfere in the RT-PCR analysis, such as the viral load of the sample, collection site, collection methodology, sample storage, transport, primer, and probe mismatch/dimerization in different brand kits. This is a pioneer study to discuss the factor that could lead to the wrong interpretation of RT-qPCR diagnosis of SARS-CoV-2. This study aimed to help the readers to understand what very likely is behind a bad result of SARS-CoV-2 detection by RT-PCR and what could be done to reach a reliable diagnosis.
    MeSH term(s) COVID-19/diagnosis ; COVID-19 Testing ; Humans ; RNA, Viral/analysis ; RNA, Viral/genetics ; Reverse Transcriptase Polymerase Chain Reaction ; SARS-CoV-2/genetics ; Sensitivity and Specificity
    Chemical Substances RNA, Viral
    Language English
    Publishing date 2022-02-21
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2112530-2
    ISSN 1744-8352 ; 1473-7159
    ISSN (online) 1744-8352
    ISSN 1473-7159
    DOI 10.1080/14737159.2022.2037425
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Three snake venoms from Bothrops genus induced apoptosis and cell cycle arrest in K562 human leukemic cell line.

    Marinho, Aline D / Lucena da Silva, Emerson / Jullyanne de Sousa Portilho, Adrhyann / Lacerda Brasil de Oliveira, Laís / Cintra Austregésilo Bezerra, Emanuel / Maria Dias Nogueira, Beatriz / Leitão-Araújo, Moema / Lúcia Machado-Alves, Maria / Correa Neto, Carlos / Seabra Ferreira, Rui / de Fátima Aquino Moreira-Nunes, Caroline / Elisabete Amaral de Moraes, Maria / Jorge, Roberta J B / Montenegro, Raquel C

    Toxicon : official journal of the International Society on Toxinology

    2023  Volume 238, Page(s) 107547

    Abstract: Cancer is indisputably one of the leading causes of death worldwide. Snake venoms are a potential source of bioactive compounds, complex mixtures constituted mainly of proteins and peptides with several pharmacological possibilities, including the ... ...

    Abstract Cancer is indisputably one of the leading causes of death worldwide. Snake venoms are a potential source of bioactive compounds, complex mixtures constituted mainly of proteins and peptides with several pharmacological possibilities, including the potential to inhibit tumoral cell growth. In the present study, it was evaluated the antitumor effect of crude venom of Bothrops erythromelas (BeV), Bothrops jararaca (from Southern and Southeastern- BjsV and BjsdV, respectively) and Bothrops alternatus (BaV) in in vitro Chronic myeloid leukemia (CML) cancer cell line model. After 24 h of cell exposure to 10 and 50 μg/mL, BjsV, BjsdV, and BaV exerted a decrease in cell viability in both concentrations. BeV was not cytotoxic and, therefore wasn't chosen for further mechanism of action investigation. Furthermore, morphological alterations show modification typical of apoptosis. Also, was observes a significant cell cycle arrest in the S phase by BjsdV and BaV treatment. Flow cytometry evidenced the involvement of changes in the cell membrane permeability and the mitochondrial function by BjsV and BjsdV, corroborating with the triggering of the apoptotic pathway by the venom administration. BjsV, BjsdV, and BaV also led to extensive DNA damage and were shown to modulate the gene expression of transcripts related to the cell cycle progression and suppress the expression of the BCR-ABL1 oncogene. Altogether, these findings suggest that the venoms trigger the apoptosis pathway due to mitochondrial damage and cell cycle arrest, with modulation of intracellular pathways important for CML progression. Thus, indicating the pharmacological potential of these venoms in the development of new antitumoral compounds.
    MeSH term(s) Animals ; Humans ; K562 Cells ; Crotalid Venoms/toxicity ; Apoptosis ; Bothrops ; Snake Venoms/pharmacology ; Cell Cycle Checkpoints ; Venomous Snakes
    Chemical Substances Crotalid Venoms ; Snake Venoms
    Language English
    Publishing date 2023-12-06
    Publishing country England
    Document type Journal Article
    ZDB-ID 204479-1
    ISSN 1879-3150 ; 0041-0101
    ISSN (online) 1879-3150
    ISSN 0041-0101
    DOI 10.1016/j.toxicon.2023.107547
    Database MEDical Literature Analysis and Retrieval System OnLINE

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