M04

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.

PBMC thawing for immune assays recovers viable cryopreserved peripheral blood mononuclear cells for downstream functional or phenotypic readouts, including ELISPOT, intracellular cytokine staining, proliferation assays, and flow-cytometric immunophenotyping. Cryopreserved PBMCs can support immune monitoring because antigen-specific T-cell function and major CD4/CD8 phenotypes may be retained after optimized freezing and thawing, although some lymphocyte subsets and activation or memory markers can be altered by cryopreservation. The technical objective is rapid warming of the frozen vial followed by controlled dilution and removal of DMSO-containing cryomedium, because thawing and wash conditions measurably affect viable PBMC recovery and downstream assay performance. Viability alone is insufficient for protocol evaluation because high viability may occur with low live-cell recovery, so both viable percentage and absolute live-cell recovery should be measured after thawing.

Human monocyte-derived dendritic cells are generated by isolating PBMC-derived monocytes and culturing them with GM-CSF plus IL-4, which produces cells with dendritic-cell antigen-presenting properties, reduced monocyte phenotype, and increased dendritic-cell functional readouts such as antigen uptake, allogeneic T-cell stimulation, and expression of markers including HLA-DR, CD80, CD86, CD83, CD1a, or CD209 depending on protocol and maturation state. The main readout is phenotypic and functional differentiation: immature MoDCs are commonly evaluated by loss or reduction of CD14 with acquisition of dendritic-cell markers and antigen uptake capacity, whereas mature MoDCs are evaluated by increased CD83, CD80, CD86, HLA-DR, and T-cell stimulatory function after exposure to maturation stimuli such as TNF-α or a cytokine/PGE2 cocktail.

Pyroptosis is a lytic inflammatory cell-death pathway executed by gasdermin pores, most classically through inflammasome-mediated activation of caspase-1, cleavage of gasdermin D, membrane pore formation, LDH release, and secretion of IL-1β and IL-18. The canonical pathway is commonly modeled by priming cells with an inflammatory signal such as LPS to induce pro-IL-1β and inflammasome components, followed by an activation signal such as ATP or nigericin to activate NLRP3, ASC speck formation, caspase-1 cleavage, GSDMD cleavage, cytokine release, and pyroptotic membrane rupture. The non-canonical pathway is triggered when cytosolic LPS activates mouse caspase-11 or human caspase-4/5, leading to GSDMD cleavage and pyroptosis, and this can secondarily activate NLRP3-dependent IL-1β release. Pyroptosis is linked to inflammatory injury, infection, cancer, liver disease, ocular disease, placental inflammation, and other disease phenotypes, but unresolved questions include which gasdermin fam