siRNA / miRNA gene silencing Human HNSCC cell line

TUNEL assay is the cell death detection method where the biochemical marker of apoptosis is DNA fragmentation. The assay involves the microscopical detection of generated DNA fragments with free 3'-hydroxyl residues. in apoptotic cells using enzyme terminal deoxynucleotidyl transferase (TdT) which adds biotinylated nucleotides at the site of DNA breaks. Major challenges of this method involve proper access of the enzyme which could be hampered by poor permeabilization and/or excessive fixation with cross-linking fixative (common with archival tissue). This issue can be resolved by optimizing the incubation time with Proteinase K or CytoninTM.

Human embryonic stem cells (hESCs) and induced pluripotent stem cells (iPSCs) have been greatly used for studies on embryonic development and cell differentiation.iPSCs provide a stable source for either self-renewal or differentiation into suitable cells when cultured in a particular environment. Pluripotent cell culture was originally started by deriving cells from inner cell mass (ICM) from pre-implanted blastocysts, these were called embryonic stem cells. These cells after isolation can be grown on traditional extracellular matrices (like mouse embryonic fibroblasts, MEFs) or feeder-free culture systems. DMEM/F12 has been the most commonly used basal media in the culture of pluripotent cells. These cells are cultured at normal atmospheric oxygen levels, 21%, however, some studies have proposed that 4% oxygen tension may be better for hESC growth. Higher D-glucose concentration (4.2g/l) and osmolarity (320mOsm) that mimics the natural environment of embryonic tissue are optimal for the growth of hESCs. Supplements like N2 and/or B-27, in the presence of growth factors like bFGF, have been shown to increase pluripotency of these cells. bFGF, FGF2 and other ligands of receptor tyrosine kinases like IGF are also required or maintain self-renewal ability of these cells. TGF𝛃1, by its activation of SMAD2/3 signalling, also represses differentiation of iPSCs. Other compounds like ROCK inhibitors reduce blebbing and apoptosis in these cells to maintain their clonogenicity. However, an inhibitor for LIF (leukaemia inhibitory factor, which is one of the pluripotent genes) has an opposing effect. Therefore, it is important to understand the culture conditions and media composition that affect downstream signalling in hESCs or iPSCs that may lead to their differentiation.

When extracting nucleic acids from cell cultures, thorough homogenization of cells via vortexing in lysis buffer is very necessary. Choose the best RNA isolation method keeping in mind the downstream applications, generally, column-based isolations result in clean and concentrated RNA samples. Downstream applications like sequencing and cDNA synthesis require high-quality RNA, always treat the samples with DNases and check their integrity by running a gel.

Get tips on using Lipofectamine® RNAiMAX Transfection Reagent to perform siRNA / RNAi /miRNA transfection Human Cells - Jurkat cells Lipofectamine

Get tips on using Attractene Transfection Reagent to perform shRNA gene silencing Human - HEK 293T CAPN5- (Calpains) cationic lipid based

Get tips on using ShRNA CD24 Lentiviral Transduction Particles (CD24-V2LHS_71909)) to perform shRNA gene silencing Mouse - Prostate cancer cell lines (DU145 and PC3) CD24 lentiviral particles

Get tips on using ShRNA CD24 Lentiviral Transduction Particles (CD24-V2LHS_71908) to perform shRNA gene silencing Mouse - Prostate cancer cell lines (DU145 and PC3) CD24 lentiviral particles

Get tips on using TransIT-TKO Transfection Reagent to perform siRNA / RNAi /miRNA transfection Human Cells - Primary splenocytes Polymer / lipid

Get tips on using Lipofectamine® RNAiMAX Transfection Reagent to perform siRNA / RNAi /miRNA transfection Human Cells - OV-2008 Lipofectamine

Get tips on using Lipofectamine® RNAiMAX Transfection Reagent to perform siRNA / RNAi /miRNA transfection Human Cells - THP-1 Lipofectamine