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Growth-inhibitory and apoptosis-inducing effects of tanshinones on hematological malignancy cells and their
1State Key Laboratory of Biotherapy, Department of Hematology, West China Hospital, Sichuan, People's Republic of China.
Abstract:
This study has investigated the growth-inhibitory and apoptosis-inducing effects of dihydrotanshinone, tanshinone I, tanshinone IIA, and cryptotanshinone on hematological malignancy cell lines, aiming to explore their structure-activity relationship. The growth-inhibitory effects of the tanshinones on K562 and Raji cells were assessed using a modified MTT assay; the apoptosis-inducing effects were assessed by fluorescence microscopy and flow cytometry analysis. The changes in cellular morphology were observed using an inverted phase-contrast microscope. MTT results revealed that these tanshinones inhibited cell proliferation in a concentration-dependent and time-dependent manner. The IC50 values of dihydrotanshinone, tanshinone I, tanshinone IIA, and cryptotanshinone for K562 cells were 3.50, 13.52, 19.32, and 47.52 μmol/l at 24 h; 1.36, 4.70, 5.67, and 22.72 μmol/l at 48 h; and 1.15, 1.59, 2.82, and 19.53 μmol/l at 72 h, and the values for Raji cells were 3.30, 4.37, 12.92, and 52.36 μmol/l at 24 h; 1.55, 1.71, 6.54, and 25.45 μmol/l at 48 h; and 1.07, 1.38, 1.89, and 18.47 μmol/l at 72 h. The flow cytometry analysis demonstrated that these tanshinones induced apoptosis of K562 cells in a concentration-dependent manner, and dihydrotanshinone as well as tanshinone I were more potent than tanshinone IIA and cryptotanshinone. Some noticeable apoptotic morphologies could be observed by fluorescence microscopy on tanshinones-treated Raji cells. Collectively, these tanshinones caused growth inhibition and apoptosis in hematological malignancy cell lines, with dihydrotanshinone being the most potent, followed by tanshinone I, tanshinone IIA, and cryptotanshinone. These results suggested that the structure of aromatic ring A enhanced the cytotoxicity and the structure of ring C may have contributed to the cytotoxicity, but the mechanisms need to be further investigated.
Insights
Dihydrotanshinone and tanshinone I show potent anti-cancer effects, inhibiting growth and inducing apoptosis in hematological malignancy cell lines. These findings highlight tanshinones as potential therapeutic agents for blood cancers.
Area of Science:
- Pharmacology and Natural Products Chemistry
- Cancer Biology and Therapeutics
- Medicinal Chemistry
Background:
- Tanshinones are a class of diterpenoid compounds derived from Salvia miltiorrhiza (Danshen).
- These compounds have demonstrated various biological activities, including anti-cancer properties.
- Their potential in treating hematological malignancies warrants further investigation.
Purpose of the Study:
- To investigate the growth-inhibitory and apoptosis-inducing effects of four tanshinones (dihydrotanshinone, tanshinone I, tanshinone IIA, cryptotanshinone) on hematological malignancy cell lines.
- To explore the structure-activity relationship of these tanshinones concerning their anti-cancer effects.
- To identify the most potent tanshinone for potential therapeutic development.
Main Methods:
- Cell viability was assessed using a modified MTT assay.
- Apoptosis induction was evaluated through fluorescence microscopy and flow cytometry analysis.
- Cellular morphology changes were observed using an inverted phase-contrast microscope.
Main Results:
- All tested tanshinones exhibited concentration- and time-dependent inhibition of cell proliferation in K562 and Raji cells.
- Dihydrotanshinone demonstrated the highest potency (lowest IC50 values), followed by tanshinone I, tanshinone IIA, and cryptotanshinone.
- Flow cytometry confirmed that dihydrotanshinone and tanshinone I were more potent apoptosis inducers in K562 cells.
Conclusions:
- Tanshinones effectively inhibit growth and induce apoptosis in hematological malignancy cell lines.
- Dihydrotanshinone and tanshinone I are the most potent among the tested compounds.
- Structural features, particularly aromatic ring A, appear to enhance tanshinone cytotoxicity, suggesting potential for developing novel anti-cancer drugs.