Molecular Biology and Genetics / Moleküler Biyoloji ve Genetik

Permanent URI for this collectionhttps://hdl.handle.net/11147/9

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Access Right: Open AccessAuthor: search.filters.author.Khan, Nasar

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Now showing 1 - 3 of 3
  • Article
    Citation - WoS: 24
    Citation - Scopus: 23
    Polyethers Isolated From the Marine Actinobacterium Streptomyces Cacaoi Inhibit Autophagy and Induce Apoptosis in Cancer Cells
    (Elsevier, 2019) Khan, Nasar; Yılmaz, Sinem; Aksoy, Semiha; Uzel, Ataç; Tosun, Çiğdem; Ballar Kırmızıbayrak, Petek; Bedir, Erdal
    Polyether compounds, a large group of biologically active metabolites produced by Streptomyces species have been reported to show a variety of bioactivity such as antibacterial, antifungal, antiparasitic, antiviral, and tumour cell cytotoxicity. Since some of these compounds target cancer stem cells and multi-drug resistant cancer cells, this family of compounds have become of high interest. In this study, three polyether-type metabolites (1-3), one of which was a new natural product (3), were isolated from the marine derived Streptomyces cacaoi via antimicrobial activity-guided fractionation studies. As several polyether compounds with structural similarity such as monensin have been linked with autophagy and cell death, we first assessed the cytotoxicity of these three compounds. Compounds 2 and 3, but not 1, were found to be cytotoxic in several cell lines with a higher potency towards cancer cells. Furthermore, 2 and 3 caused accumulation of both autophagy flux markers LC3-II and p62 along with cleavage of caspase-3, caspase-9 and poly (ADP-ribose) polymerase 1 (PARP-1). Interestingly, prolonged treatment of the compounds caused a dramatic downregulation of the proteins related to autophagasome formation in a dose dependent manner. Our findings provide insights on the molecular mechanisms of the polyether-type polyketides, and signify their potency as chemotherapeutic agents through inhibiting autophagy and inducing apoptosis.
  • Article
    Citation - WoS: 3
    Citation - Scopus: 3
    Frequency and Levels of Potential Drug-Drug Interactions in Tuberculosis Patients of a Teaching Hospital in Pakistan
    (Colegio de Farmaceuticos de la Provincia de Buenos Aires, 2016) Uddin, Fayyaz; Khan, Nasar; Ghani, Shamsul; Khan, Saeed A.
    Polypharmacy in tuberculosis is used to prevent occurrence of resistance to mycobacteria. However, drug-drug interaction is one of the undesirable consequences of polypharmacy, that may lead to ineffective medication or change in therapeutic response. The objective of the study was to identify prevalence, types and nature of potential drug-drug interactions in tuberculosis patients at Khyber Teaching Hospital, Peshawar Pakistan. Medical records of 409 randomly-selected patients were reviewed for pDDIs using Micromedex Database. Results show that total 304 interacting-combinations lead to 1437 potential drug-drug interactions. 87.5% of the these potential drug-drug interactions were of moderate and major severity (i.e., 65.6% and 44.3% respectively). With regards to scientific-evidence, almost 50% of the potential drug-drug interactions were good documented while 34.7% had fair level of documentation. Furthermore, we have listed some of the interacting drug combinations, particularly most frequent major and moderate interactions, will help health care professionals to review their established therapeutic strategy for tuberculosis patients in their clinical settings.
  • Article
    Citation - WoS: 3
    Citation - Scopus: 5
    Prevalence of Hepatitis B Viral Infection in Punjab Province of Pakistan
    (University of Punjab (new Campus), 2017) Khan, Nasar; Ali, Fahad; Bahadar, Sulaiman; Ur Rahman, Khalil; Aziz, Abdul; Ul Akbar, Noor; Daud, Muhammad; Hayat, Azam; Ur Rehman, Mujaddad
    Hepatitis B viral (HBV) infection is a major health problem globally and more prevalent in Pakistan, and HBV. which is the main etiological agent of chronic hepatitis B, hepatocellular carcinoma and liver cirrhosis. A total of 659 HBsAg ELISA positive patients out of 16825 patients during July to October, 2013 were screened for HBV by real-time polymerase chain reaction. Out of 659, 522 (79.21%) were found positive for HBV, of which 318 (over all 4.4%) were male, while 341 (over all 3.55%) were female. The HBV PCR positivity rate was 80.18% (n=255) in males and 78.30% (n=267) in females patients. Among different age groups HBV PCR positivity was highest (n=181, 83.41%) in the age group of 31 to 40 years. HBV genome was detected in 79.21% of HBsAg positive samples, showing that HBsAg on ELISA is much more sensitive than PCR as HBV shows chronic conditions and both of the tests are needed against HBV.