3-Bromocarbazole-d₇

Reverse transcription technology uses RNA as a template to synthesize DNA. RT-PCR is simple, specific and sensitive, and can be used to detect gene expression levels and expression differences in cells; detect RNA virus content; clone cDNA sequences of specific genes.

By lysing cells, releasing RNA, and removing impurities such as proteins and DNA, high-purity RNA products are finally obtained. The commonly used traditional method is the guanidine isothiocyanate/phenol/chloroform method (Trizol), which is suitable for a variety of animal materials including animal tissues, microorganisms, cultured cells, etc., and most plant materials.

This protocol assesses in vitro neurotoxicity by combining neuronal viability, mitochondrial/metabolic activity, neurite outgrowth, and optional neuronal network function readouts. Calcein-AM or resazurin/PrestoBlue readouts estimate viable or metabolically active cells; βIII-tubulin immunofluorescence detects neuronal morphology and neurite networks; TMRE detects mitochondrial membrane potential; and MEA recordings detect functional changes in neuronal network activity.

SH-SY5Y neuronal-like differentiation uses defined culture conditions to shift proliferative human neuroblastoma cells toward a neuron-like state, mainly assessed by reduced proliferation, neurite extension, neuronal-marker expression, and, in some protocols, increased dependence on neurotrophic support. Retinoic acid (RA) is commonly used for the first differentiation phase, and sequential RA followed by brain-derived neurotrophic factor (BDNF) in serum-free medium is a well-characterized approach for generating neuron-like SH-SY5Y cultures with extensive neurite outgrowth. The primary readouts are morphology-based neurite outgrowth and marker-based confirmation using proteins such as βIII-tubulin, MAP2, GAP43, synaptophysin, NeuN, NSE, TH, or related neuronal/synaptic markers, depending on the study endpoint.

Cell differentiation refers to the process in which cells of the same origin gradually produce cell groups with different morphological structure and functional characteristics.

Breast cancer is a heterogeneous cancer, and it has been distinguished into four subtypes: luminal A, luminal B, HER2-positive and basal-like. Molecular mutations, epigenetic alterations, hormone exposure and immune microenvironment are related to the progression of breast cancer.

Real-time quantitative PCR (qPCR) quantifies an amplifiable nucleic-acid target by monitoring fluorescence during PCR cycling rather than measuring product only after amplification. The increase in fluorescence tracks accumulation of PCR product, and the quantification cycle (Cq; historically also Ct/CP) is related to the initial amount of target: samples containing more starting target generally reach the defined fluorescence threshold in fewer cycles.