ELISA

Blood glucose levels will naturally rise following food intake. In response to elevated blood sugar, the beta cells located in the pancreatic islets synthesize and secrete insulin to maintain blood glucose concentrations within a stable physiological range. As a critical protein hormone in the human body, insulin functions like a molecular key that unlocks peripheral tissue cells, facilitating the uptake and internalization of circulating glucose into intracellular compartments and effectively lowering blood glucose levels.

The Janus kinase‑signal transducer and activator of transcription (JAK/STAT) cascade refers to a continuous intracellular protein interaction network that transmits extracellular stimulation signals into cells to trigger downstream biological responses. This signal transduction module exists widely in mammalian somatic cells and participates in the regulation of diverse physiological activities.

Mitogen‑activated protein kinase (MAPK) signaling cascades represent a set of highly evolutionarily conserved signal transduction systems that exist across primitive prokaryotes and complex mammalian cells. Among all MAPK subfamilies, the MAPK‑ERK axis specializes in relaying extracellular stimuli from the cell surface deep into the cytoplasm and nucleus. After completing multi‑step kinase phosphorylation cascades, this pathway initiates a wide spectrum of cellular physiological outcomes, including cell cycle progression, clonal proliferation, cell lineage differentiation, malignant transformation, and programmed cell death (apoptosis). Its high conservation across species highlights its irreplaceable role in maintaining basic cellular homeostasis.

The mitogen‑activated protein kinase (MAPK) cascade refers to an evolutionarily conserved intracellular signaling module that governs multiple core cellular behaviors such as cell proliferation, differentiation and migratory movement. This signaling system consists of a wide array of functional protein molecules, among which ERK (extracellular signal‑regulated kinases) represents the initial identified subtype of MAPK family. It relays intracellular signals via sequential protein phosphorylation, acting as molecular switches to turn biological processes on or off.

The mammalian target of rapamycin (mTOR) signaling cascade receives and consolidates signals originating from both inside and outside cells, and exerts critical regulatory effects on a wide array of cellular activities, including metabolic balance, cell expansion, division, and cell survival.

Nuclear factor‑kappa B (NF‑κB) refers to a collective group of transcription factor proteins that exert biological effects in dimeric forms, controlling the expression of target genes associated with immune defense, inflammatory reactions and cellular survival status.

Oxidative phosphorylation, also called electron transport-coupled phosphorylation, refers to a core metabolic route that transforms chemical energy released during nutrient oxidation into ATP via the electron transport chain. It acts as a critical cellular energy conversion reaction and represents the final stage of aerobic respiration inside eukaryotic cells.

TP53 gene aberrations show strong pathological correlation with a wide range of human malignancies, including hepatocellular carcinoma, mammary carcinoma, bladder cancer, ovarian neoplasms, intracranial tumors, gastric carcinoma, colorectal cancer, esophageal carcinoma, lung carcinoma and hematological leukemia.

TMB (3,3',5,5'-tetramethylbenzidine) is the most commonly used chromogenic substrate in enzyme-linked immunosorbent assays, relying on horseradish peroxidase to catalyze the color reaction. It is widely used in conjunction with ELISA, immunohistochemistry, and other immunoassay labeling experiments, directly determining the sensitivity, reproducibility, and reliability of the test data. In actual experiments, any improper operation in TMB reagent storage, sample addition and plate washing, incubation control, or environmental interference can cause various abnormal issues such as high background, no color development, well-to-well color differences, reading fluctuations, and premature reagent oxidation and deterioration, greatly increasing the cost of repeated experiments and even rendering clinical or research sample data invalid.

Within the phosphatidylinositol signal cascade, cell-surface receptors bind external signaling ligands to trigger phospholipase C (PLC) activation. The activated PLC enzyme then breaks down phosphatidylinositol-(4,5)-bisphosphate (PIP2), splitting it into two distinct secondary messenger molecules: inositol trisphosphate (IP3) and diacylglycerol (DAG). These two messengers jointly translate extracellular stimulation into intracellular signaling events, forming the phosphatidylinositol signal transmission network, which is also widely referred to as the dual messenger system.