Practical answers for wet-lab scientists using Doxorubicin (DNA topoisomerase II inhibitor): each question opens its own page with a literature-grounded answer, citations and references.
Figure 3. Flow cytometric studies (dot plot, histograms) of viable HT29 cell suspension exposed to high concentration doxorubicin (RIGHT) 2 h previously or not (LEFT). Samples are either unstained detected using FL2 channel (excitation/emission 488/585 ± 42 nm) (top row), stained with propidium iodi
Figure 1. Spectral imaging on doxorubicin (dox). (a) Brightfield, emission spectral and merged images of dox-only (dissolved dox as a positive control), non-treated cells (negative control), and 18-h dox-treated cells at various concentrations. Cells were then fixed and imaged. White box = backgroun
Figure 1. Comparison of the absorbance spectra of all intervenient compounds in MTT assay. Absorbance scanning between 450 and 650 nm wavelength where it is possible to see the overlapping of DMEM, Formazan and DMEM+MTT at 560 nm (a). The fluorescence spectra of DOXO standard with excitation waveleng
Comparison between filtering dilute Doxorubicin through a high-binding PVDF membrane (causing anthracycline retention, solution de-coloration, and reduced cytotoxicity) versus direct aseptic dilution of a 10 mM DMSO stock into sterile medium to ensure accurate dosing.
Schematic comparing diluted Doxorubicin stored in a polystyrene tube (where hydrophobic and π–π surface adsorption severely depletes free drug and minimizes cellular uptake) against fresh preparation in low-retention polypropylene vessels (preserving effective solute concentration and enabling robus
Doxorubicin is actively exported across the plasma membrane and sequestered in cytoplasmic vesicles by ABCB1 (MDR1), preventing nuclear entry and TOP2A inhibition.
A schematic comparing the failed reconstitution of Doxorubicin in pure ethanol (showing insoluble precipitate due to solubility <1 mg/mL) with the correct procedure using anhydrous DMSO (10 mM, 5.80 mg/mL) or sterile water to form a clear red solution.
The schematic contrasts unshielded benchtop handling in clear plastic tubes (ambient light induces photo-oxidation of the planar anthraquinone core, causing color fading from red to pale orange/yellow and loss of Topo II-inhibitory potency) with light-protected workflow using amber or foil-wrapped v
Doxorubicin poisons topoisomerase II (TOP2A/TOP2B) to trap covalent DNA-protein cleavage complexes, generating frank double-strand breaks that activate ATM/ATR kinase signaling and trigger histone H2AX Ser139 phosphorylation into discrete foci.
Fig 7. Population average Itot time dependences for different doxorubicin concentrations in live cell culture, (a) [dye] = 8 μM and (b) [dye] = 0.25 μM. (c) and (d): Population average CVp, same conditions as above.