HL-60 / A. Relationship between Expression of Cell Regulatory Factor SKP2 and Drug Resistance of HL-60 / A Cells

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30 2 2009 3 ( ) JOURNAL OF SUN YAT-SEN UNIVERSITY(MEDICAL SCIENCES) Vol.30 No.2 Mar. 2009 SKP2 HL-60 / A, *,,,,,, (, 510120) : SKP2 P27 kip1 HL-60 / A HL-60, RT-PCR Western blot SKP2 P27 kip1 MRP mrna,, HL- 60 / A 49.14 39.20 6.43 ;HL-60 / A MRP HL-60; HL-60 / A HL-60 G0 / G1 (35.10 ± 0.81)%(43.96 ± 1.12)%, P < 0.05;HL-60 / A SKP2 HL-60 ;P27 kip1 HL-60 HL-60 / A MRP HL-60 / A, : ; S 2; ; : R733.7 : A : 1672-3554(2009)02-0137-05 Relationship between Expression of Cell Regulatory Factor SKP2 and Drug Resistance of HL-60 / A Cells XIAO Jie, YIN Song-mei *, XIE Shuang-feng, NIE Da-nian, LI Yi-qing, MA Li-ping, WANG Xiu-ju, FENG Jian-hong (Department of Hematology, The Second Affiliated Hospital, SUN Yat-sen University, Guangzhou 510120, China) Abstract: Objective To observe the proportion of cell cycle and the expression of cell cycle regulators S-phase kinaseassociated protein 2 (SKP2) and P27 kip1 in drug-resistant leukemia cell line HL-60 / A and drug non-resistant cell line HL-60, and to investigate the relationship between proliferation and multi-drug resistance of leukemia cells. Methods The expression of SKP2, P27 kip1, and multi-drug resistance associated protein (MRP) mrna were determined by RT-PCR and Western blot analysis. The cell cycle was analyzed by flow cytometry. Drug toxicity analysis was used to determine the sensitivity of the cells to chemotherapeutic drugs. Results Drug-resistant leukemia cell line HL-60 / A showed 49.14-fold resistance to Adriamycin, 39.20- fold resistance to Daunorubicin, and 6.43-fold resistance to Arabinosylcytosine, respectively. MRP expression of HL-60 / A cell was higher than that of HL-60 cell. The proportions of HL-60 / A cells and HL-60 cells in the G0 / G1 phase of the cell cycle were (35.10 ± 0.81)% and (43.96 ± 1.12)%, respectively (P < 0.05). The expression of SKP2 was significantly higher in HL-60 / A cells than that in HL-60 cells, but the expression of P27 kip1 in HL-60 / A cells was lower. Conclusions The mechanism of multidrug resistance of HL-60 / A cell line is related to up-regulated expression of MRP. The proportion of drug resistant cell line HL- 60 / A at the proliferation stage is high which indicates that drug-resistant cells have higher proliferative activity. Key words: cell cycle; S-phase kinase-associated protein 2; multi-drug resistance-associated protein; leukemia [J SUN Yat-sen Univ(Med Sci),2009,30(2):137-141], (acute leukemia, AL), 20% ~ 30% AL [1-2],, 60% ~ 70% :2008-10-14 : (06021324) (2006J1-C0071) :,, ; * :,,E-mail:yinsongmei@21cn.com

138 ( ) 30,, 2 ml 700 ml / L 4,, 2 000 r / min(r = 10 cm) 5 min,,pbs HL-60 HL-60 / A 2, 50 mg / LRNA 50 μl,50 mg / L SKP2 P27 kip1, SKP2 P27 kip1 (propidium iodide, PI) 450 μl,37 1 h, 1 1.1 1.1.1 HL-60, :5 -CTT TTC ACT TCG GGC TGT GT-, 100 ml / L 3, :5 -CAC AAA ACA TGC CAC TTT ( ) 30 g / L,100 IU / ml,100 μg / ml RPMI1640 CTT CGT TCT CAG GCA CAT CA-3, :5 ( Gibco), 5% CO 2 37 -GCC TCA TCC AAC ACA AGG AT-3,,2 1 HL-60 / A 447 bp;β-actin :5 -GTC CAC CTT CCA GCA GAT GT-3, :5 -CAC CTT 1.1.2 P27 kip1 (IgG )( R&D system ); MRP (multi-drug resistance associated protein, MRP) 1.2.4 RT-PCR SKP2 P27 kip1 MRP β- (IgG ) ( CHEMICON ); actin mrna HL-60 SKP2 (IgG ) ( Zymed Laboratories ); GAPDH (IgG) ( CHEMICON );HRP IgG ( );MMuLV, RNA RNA Taq DNA ( MBI ), ( 0.5 μg / μl 10 μl RNA, Biowest );Phototope-HRP detection kit ( cell sigaling);cell counting kit-8( 5 min, 5 4 μl, ); ( ); RNA (20 U / μl) 1 μl,10 mmol dntp ( ); 2 μl, 37 5 min M-MuLV ) 96, 1 10 5, 100 μl, 1.2 60 min,70 10 min,, 1.2.1 HL- cdna -20 60 HL-60 / A,1 000 r / min(r = 10 cm) 5 PCR 2 μl, 10 min,, 5 μl,10 mmol dntp 1 μl,mgcl 2 3 μl, 2.5 μl,taq DNA (1 U / μl)1.5 μl, 24 h 37 CCK-8,32.5 μl, 50 SKP2 95 4 h,450 nm 30 s,94 30 s,54 30 s, 6, 4 72 1 min,30 P27 kip1 1.2.2 HL- 95 30 s,94 30 s,54 30 s 60 HL-60 / A,PBS 2, PBS,72 1 min,30 MRP, 1 10 6 / ml,0.5 ml 1.2.3 RT-PCR SKP2,P27 kip1, MRP,β-actin primer premier 5.0 SKP2 :5 -GCC CCA ATC TTG TCC ATC TA-3, :5 -CTG CGA TTC CAA AAA CT-3, 192 bp; P27 kip1 GG-3, 368 bp;mrp :5 - CAC CGT TCC AGT TT-3, 245 bp HL-60 / A,PBS 2, trizol (invitrogen ) RNA, RNA (A260 / A280 > 1.8), 1 μl, 12 70 (200 U / μl) 1 μl, 20 μl,42 (20 μmol / L) 2.5 μl, (20 μmol / L) 95 30 s,94 30 s,55.5

2,. SKP2 HL-60 / A 139 30 s,72 1 min,30 β-actin 95 30 s,94 30 s, 55 30 s,72 1 min,30 PCR 20 g / L, 1.2.5 Western-blot SKP2 P27 kip1 MRP GAPDH HL-60 HL-60 / A,PBS 2, RIPA (), PMSF, 1 mmol / L 1 10 6 200 μl,,100 15 min, 4 12 000 g 15 min, -80 BCA, 5 5 min, SDS-PAGE, SKP2 P27 kip1 β-actin 12%,MRP 6%, 45 min,200 V SKP2 P27 kip1 GAPDH 90min,100 V,MRP 180 min,80 V PVDF,TBS / T 1 h TBS / T 3,,4,TBS / T 3, 2 h,tbs / T 3, 1 HL-60 HL-60 / A, 10 ml LumiGLO, 1 min X 1 ~ 3 min, 30 ~ 60 min, 10 min 1.3 ± (x ± s), 2.2 HL-60 / A MRP HL-60 t, P < 0.05 2 2.1 HL-60 / A (t = -4.4, P = 0.004,2) Western blot ADR HL-60 (Inh MRP, GAPDH ibitory concentration 50, IC50) 0.044 μg / ml, MRP (0.20 ± HL-60 / A IC50 2.162 μg / ml, 0.02)%(0.60 ± 0.04)%, 49.14 DNR HL-60 IC50 0.035 μg / ml,hl-60 / A IC50 1.388 μg / ml, 39.20 Ara-C HL-60 IC50 0.04 μg / ml, HL-60 / A IC50 0.24 μg / ml, 6.43 (1) DNR ADR Ara-c Fig.1 Drug sensitivity curves of HL-60 and HL-60 / A cells to DNR, ADR, and Ara-c at different drug concentration(n = 4) RT-PCR HL-60 HL-60 / A MRP mrna, β-actin HL-60 HL-60 / A MRP mrna (0.34 ± 0.12)%(0.60 ± 0.07)%, (t = -16.4, P = 0.000,3) 2.3 HL-60 / A SKP2,P27 kip1 RT-PCR HL-60 HL-60 / A SKP2 P27 kip1 mrna, β-actin

140 ( ) 30 2 Fig.2 HL-60 HL-60 / A SKP2 P27 kip1 MRP mrna SKP2, P27 kip1, and MRP mrna expression in HL60 and HL-60 / A cells A: HL-60 cell; B: HL-60 / A cell Lane 5 8: marker; Lane 4 10: MRP; Lane 3 9: P27 kip1 ; Lane 2 7: SKP2; Lane 1 6: β-actin 3 Fig.3 HL-60 HL-60 / A SKP2 P27 kip1 MRP Protein expression of SKP2, P27 kip1, and MRP in HL-60 and HL-60 / A cells A: GAPDH protein; B: SKP2 protein; C: P27 kip1 protein; D: MRP protein HL60 HL-60 / A SKP2 mrna (0.52 ± 0.01)% (0.83 ± 0.03)%, (t = -19.1, P = 0.000) P27 kip1 mrna (0.75 ± 0.04)% (0.41 ± 0.05)%, (t = 11.8, P = 0.000,2)Western blot HL60 HL-60 / A SKP2 P27 kip1, GAPDH HL60 HL-60 / A SKP2 (0.27 ± 0.045)% (0.58 ± 0.06)%,,(t = -7.4, P = 0.002);P27 kip1 (0.63 ± 0.13)%(0.30 ± 0.13)%, (t = 3.1, P = 0.037,3) 2.4 HL-60 / A G1 HL-60 HL-60 / A G0 / G1 : (43.96 ± 1.12)% (35.10 ± 0.81)%, (t = 11.1, P = 0.001) S :(49.85 ± 0.91)% (55.56 ± 0.95)%, (t = -7.5, P = 0.002) G2-M :(6.19 ± 1.52)% (9.34 ± 0.25)%, (t = -3.5, P = 0.066) S G2-M (4) A. B. Fig.4 4 Determination of Cell cycles of the different cells by flow cytometry A: HL-60 cells; B: HL-60 / A cells 3 MRP,HL-60 / DOX (multi-drug resistance, MRD) HL-60 / A (multi-drug resistance associated protein, MRP) 190 ku, ATP (ATP-binding cassette,, HL-60 / DOX, HL-60 / DOX,,HL-60 / A, [3] ABC) Wada [4] 49.14 39.20 6.43

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