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Journal of Chinese Integrative Medicine ›› 2008, Vol. 6 ›› Issue (8): 852-855.doi: 10.3736/jcim20080815

• Original Experimental Research • Previous Articles     Next Articles

Effects of psoralen plus long-wave ultraviolet-A on apoptosis of HL-60 leukemia cells

Nan-nan Chen(), Shi-lin Huang, Yang Xiang, Li Zhang, De-jie Zhang   

  1. Department of Traditional Chinese Medicine and Hematology, Dalian 210th Hospital of People's Liberation Army, Dalian, Liaoning Province 116021, China
  • Received:2007-12-11 Online:2008-08-20 Published:2008-08-15

Objective: To explore the effects of psoralen (PSO) plus long-wave ultraviolet-A (PUVA) on apoptosis and expression of Fas ligand (FasL) in HL-60 leukemia cells.
Methods: The HL-60 cells were taken as the study objects and their apoptosis rates, ultrastructure changes and the expression of FasL were detected in order to observe the effects of PSO and ultraviolet-A (UVA) of wave length 360 nm. The factorial design and analysis of variance were used to analyze the interaction among the factors.
Results: PSO, UVA and PUVA all induced the apoptosis and the effects of PUVA were stronger than those of the other two. After HL-60 cells had been treated with PUVA, they all showed obvious ultrastructure changes due to apoptosis observed under the electron microscope. PSO, UVA and PUVA all decreased the expressions of FasL gene and protein. The effects of PUVA were stronger than those of the other two.
Conclusions: PUVA can induce the apoptosis of HL-60 cells and the effects are stronger than those of PSO or UVA alone. The expression of FasL gene in HL-60 cells is down-regulated during the apoptosis induced by PUVA.

Key words: leukemia, HL-60 cells, apoptosis, Fas ligand, ultraviolet therapy, photochemotherapy, psoralen

CLC Number: 

  • R733.71

Table 1

Apoptotic percentages of HL-60 cells and expressions of FasL mRNA and protein in HL-60 cells after 24-hour PUVA treatment (x±s)"

Group n Apoptosis ratio (%) FasL mRNA (bp/μg) FasL protein (%)
HL-60 cell control 3 10.60±0.31 (8.69±0.44)×107 58.67±1.75
UVA-treated 3 28.53±0.05** (2.64±0.31)×107** 33.90±1.90**
10 μg/ml PSO-treated 3 18.90±0.06** (7.03±0.47)×107** 58.40±1.87**
20 μg/ml PSO-treated 3 25.64±0.23** (5.68±0.47)×107** 57.57±1.48**
40 μg/ml PSO-treated 3 26.19±1.21** (5.17±0.38)×107** 54.33±1.69**
80 μg/ml PSO-treated 3 26.94±0.26** (2.71±0.29)×107** 37.40±1.73**
PUVA (10 μg/ml)-treated 3 29.17±0.38**△△ (1.58±0.38)×107**△△ 19.13±1.31**△△
PUVA (20 μg/ml)-treated 3 32.56±0.04**△△ (8.20±1.45)×106**△△ 18.50±1.51**△△
PUVA (40 μg/ml)-treated 3 33.39±0.11**△△ (1.64±0.40)×106**△△ 17.53±1.74**△△
PUVA (80 μg/ml)-treated 3 37.72±0.09**△△ (2.61±0.33)×105**△△ 15.60±1.42**△△

Figure 1

Change of ultrastructure in HL-60 cells after 24-hour PUVA treatment A: TEM, ×2 500; B: TEM, ×6 000."

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