Mechanism of protection by daily...

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  • 안트라사이클린
  • 안트라사이클린
  • Mechanism of protection by daily...

    1. 1. Introduction
    2. 2. Introduction • Cancer • Cancer is the first leading cause of death in Korea and in many other nations in the world. • Cancer chemotherapy is typically associated with severe side effects.
    3. 3. Introduction • Cyclophosphamide (CP) • CP was introduced in 1958. • Endoxan® , Cytoxan® • Alkylaing agent solid tumors, Hodgkin’s disease, non-neoplastic conditions, and transplant rejection combatant drug (West, 1997) Pharmacological efficacy of CPPharmacological efficacy of CP
    4. 4. Introduction Limitation of CP chemotherapyLimitation of CP chemotherapy injury to normal tissue Muti-organ toxicity Testicular toxicity (Rezvanfar et al., 2008) • CP causes several adverse effects including testicular toxicity in human and experimental animals. (Qureshi et al., 1972; Elangovan et al., 2006; Rezvanfar et al., 2008) • CP causes several adverse effects including testicular toxicity in human and experimental animals. (Qureshi et al., 1972; Elangovan et al., 2006; Rezvanfar et al., 2008)
    5. 5. Introduction Testicular toxicity of CP Therefore, a potential therapeutic approach to protect or reverse CP-induced testicular toxicity would have very important clinical consequences.
    6. 6. CP metabolism-liver Toxic metabolite Toxic metabolite
    7. 7. The concomitant use of CP with other drugs that inhibit or induce the CYP2B, CYP2C, or CYP3A enzymes can lead to drug-drug interactions (Chang et al., 1997; Rae et al., 2002; Yu et al., 1999). The concomitant use of CP with other drugs that inhibit or induce the CYP2B, CYP2C, or CYP3A enzymes can lead to drug-drug interactions (Chang et al., 1997; Rae et al., 2002; Yu et al., 1999). Introduction • CP • CP is a prodrug, which requires hepatic biotransformation to exert its testicular toxic effect. Rate and pattern of CP metabolism Altering of hepatic CYPAltering of hepatic CYP
    8. 8. CPCP AcroleinAcrolein ROS production Oxidative damage ROS production Oxidative damage Introduction • Adult male patients: oligospermia or aspermia – male infertiltiy • Male rat: oligospermia or aspermaia, biochemical and structural changes in the testis and epididymis (Mirkes et al., 1984; Matalon et al., 2004) CP is cytotoxic to rapidly dividing cells - Testis: good target CP is cytotoxic to rapidly dividing cells - Testis: good target rich in polyunsaturated fatty acids low antioxidant capacity rich in polyunsaturated fatty acids low antioxidant capacity LPO of sperm membrance LPO of sperm membrance impair energy metabolism and motility impair energy metabolism and motility (Aitken et al., 1993; Alvarez and Storey, 1995) (Aitken et al., 1993; Alvarez and Storey, 1995) Spermatotoxicity
    9. 9. Introduction • CP • To avoid these toxic side effects, CP is typically used in combination with various detoxifying and protective agents to reduce or eliminate its adverse toxic effects. • Antioxidant agents have protective action against CP- induced testicular toxicity. • Taurine (Abd-Allah et al., 2005) • Flavonoids (Ozcan et al., 2005) • Melatonin (Tripathi and Jena, 2010) • Trigonella foenum-graecum L. (Bhatia et al., 2006) Thus, a combination of the drug delivered together with a potent antioxidant may be appropriate to reduce the testicular toxic effects of CP. Thus, a combination of the drug delivered together with a potent antioxidant may be appropriate to reduce the testicular toxic effects of CP.
    10. 10. Potent antioxidant Potent antioxidant Testicular toxicity
    11. 11. Introduction • Diallyl disulfide (DADS) • Garlic (Allium sativum L.) contains more than 20 organosulfur compounds. • Experimental animal studies have shown inhibition of chemically induced carcinogenesis in different organs by certain sulfur-containing compounds. (Sparnins et al., 1988; Wattenberg et al., 1989)
    12. 12. Introduction 4.7% 21.9% 41.5% • Diallyl disulfide (DADS) • A major component of the secondary metabolites derived from garlic • A potent compound to prevent cancer, genotoxicity, nephrotoxicity, urotoxicity, and hepatotoxicity (Nakagawa et al., 2001; Guyonnet et al., 2002; Pedraza-Chaverrí et al., 2003; Fukao et al., 2004; Kim et al., 2014)
    13. 13. Introduction • Diallyl disulfide (DADS) • phase I enzymes, such as hepatic CYP • phase II enzymes : GSTs • antioxidant-system capacity (Pan et al., 1993; Singh et al., 1998; Wu et al., 2001; Guyonnet et al., 2002; Pedraza- Chaverrí et al., 2003; Fukao et al., 2004) Phase IPhase I Phase IIPhase II
    14. 14. Introduction 00 Despite the favorable pharmacological properties of DADS, its protective capacity against testicular toxicity caused by CP has not been explored previously. Therefore, the aim of the present study was to evaluate the protective effects of DADS on CP-induced testicular toxicity. To study the protective mechanism of DADS, potential effects of DADS on the expression of hepatic CYP involved in the metabolism of CP, oxidative stress, and apoptotic changes in spermatogenic germ cells were also assessed. Despite the favorable pharmacological properties of DADS, its protective capacity against testicular toxicity caused by CP has not been explored previously. Therefore, the aim of the present study was to evaluate the protective effects of DADS on CP-induced testicular toxicity. To study the protective mechanism of DADS, potential effects of DADS on the expression of hepatic CYP involved in the metabolism of CP, oxidative stress, and apoptotic changes in spermatogenic germ cells were also assessed. The Aim of Present Study…The Aim of Present Study…
    15. 15. Materials and methods
    16. 16. Materials and methods Animals: Sprague-Dawley male rats aged 9 weeks Experimental groups: Total 24 rats were assigned into four experimental group. Each group consisted of 6 rats. • Test substance and treatment: DADS was gavaged to rats once daily for 10 days at 50 mg/kg/day. (Guyonnet et al., 1999; Wu et al., 2002) On the first 2 days, CP (150 mg/kg/day) was injected intraperitoneally to rats 1 h after the DADS treatment. (Matsui et al., 1995; Senthilkumar et al., 2006) • All animals were sacrificed 11 days after DADS administration. Groups Control CP CP&DADS DADS Treatment (mg/kg/day): CP/DADS 0/0 150/0 150/50 0/50
    17. 17. Materials and methods Body weight & food consumption: days 1, 3, 7, and 11(10) Reproductive organ weight: prostates, seminal vesicles, testes, and epididymides Sperm examination: epididymal sperm head count, epididymal motility, and sperm morphology Histopathologic examinations (H&E) - Testis Quantitative morphometry of spermatogenic epithelia - Stages II, V, VII, and XII - Spermatogonia, primary spermatocytes, secondary spermatocyte, spermatid. Apoptosis - Caspase-3 IHC, TUNEL assay
    18. 18. Materials and methods Oxidative stree analysis: MDA, GSH, CAT, GR, and GST (testis) Preparation of hepatic microsomes: (Jeong and Yun, 1995) – CYP analysis Western blot: β-actin, CYP2B1/2 , CYP2C11, and CYP3A1 Statistics: One-way analysis of variance followed by Tukey’s multiple comparison test on GraphPad InStat Software.
    19. 19. Results
    20. 20. Table 1. Body weight changes and food consumption in male rats treated CP and/or DADS ** P < 0.01 vs Control group; †† P < 0.01 vs CP group** P < 0.01 vs Control group; †† P < 0.01 vs CP group Items Group Control CP CP&DADS DADS No. of rats 6 6 6 6 Body weight Day 1 280.8±12.86 278.0±11.46 276.2±10.60 276.0±15.61 Day 3 299.7±10.72 263.6±11.08** 267.5±13.99** 291.6±16.91 Day 7 320.3±9.16 236.5±9.81** 248.9±9.20** 318.0±20.93 Day 11 334.3±11.02 219.9±37.02** 272.3±5.56**,†† 329.1±24.40 Food consumption Day 1 20.7±2.86a 10.0±5.67** 13.0±3.73** 19.4±0.73 Day 3 23.9±2.26 9.9±5.49** 14.3±2.64** 23.6±1.84 Day 7 21.6±0.74 3.7±4.04** 15.2±1.44**,†† 22.4±1.70 Day 10 25.7±2.29 8.5±7.01** 17.8±0.24**,†† 25.2±1.18
    21. 21. Table 2. Absolute and relative reproductive organ weights in male rats treated with CP and/or DADS *, ** P < 0.05, P < 0.01 vs Control group; † P < 0.05 vs CP group*, ** P < 0.05, P < 0.01 vs Control group; † P < 0.05 vs CP group Items Group Control CP CP&DADS DADS No. of rats 6 6 6 6 Prostates (g) 0.38±0.06 0.19±0.03** 0.24±0.05** 0.38±0.06 per body weight (%) 0.11±0.02 0.09±0.02 0.09±0.02 0.11±0.02 Seminal vesicles (g) 1.27±0.14 0.69±0.18** 0.97±0.10**,† 1.25±0.13 per body weight (%) 0.38±0.04 0.32±0.09 0.36±0.03 0.38±0.04 Testes (g) 3.45±0.37 3.15±0.33 3.33±0.35 3.27±0.27 per body weight (%) 1.03±0.11 1.45±0.15** 1.22±0.10*,† 1.00±0.08 Epididymides (g) 0.75±0.08 0.64±0.08 0.72±0.08 0.71±0.05 per body weight (%) 0.22±0.03 0.29±0.03** 0.27±0.03* 0.22±0.02
    22. 22. Table 3. Sperm analysis of male rats treated with CP and/or DADS Items Group Control CP CP&DADS DADS No. of rats 6 6 6 6 Sperm count (×106 /cauda epididymis) 141.3±13.16 146.8±18.35 155.1±21.27 157.7 ±18.31 Sperm motility (%) 79.8±3.70 48.7±7.37** 81.8±5.59†† 74.8±8.40 Sperm abnormalities (%) 6.6±1.67 7.5±2.43 7.0±3.32 7.5±1.52 Small head 0.0±0.00 0.0±0.00 0.0±0.00 0.0±0.00 Amorphous head 0.0±0.00 0.3±0.52 0.6±0.89 0.2±0.41 Two heads/tails 0.0±0.00 0.0±0.00 0.0±0.00 0.0±0.00 Excessive hook 0.2±0.45 0.2±0.41 0.2±0.45 0.2±0.41 Straight hook 3.2±1.30 2.8±2.04 2.8±1.30 1.8±2.23 Folded tail 0.8±0.84 1.8±1.94 0.8±1.10 1.3±1.97 Short tail 0.6±0.89 0.7±0.82 0.0±0.00 1.3±0.82 No tail 1.8±1.30 1.7±1.37 2.6±1.52 2.7±2.50 *, ** P < 0.05, P < 0.01 vs Control group; †, †† P < 0.05, P < 0.01 vs CP group*, ** P < 0.05, P < 0.01 vs Control group; †, †† P < 0.05, P < 0.01 vs CP group
    23. 23. Figure 1. Representative photographs of testis sections treated with CP and/or DADS. desquamation in all types of cells (black arrow), vacuolization (white arrow), degeneration of spermatocytes (black arrow head), and decreased number of spermatocytes/spermatogonia (white arrow head). desquamation in all types of cells (black arrow), vacuolization (white arrow), degeneration of spermatocytes (black arrow head), and decreased number of spermatocytes/spermatogonia (white arrow head). VC CP CP CP&DADS
    24. 24. Table 4. The number of spermatogenic cells in seminiferous tubules of male rats treated CP and/or DADS *, ** P < 0.05, P < 0.01 vs Control group; †, †† P < 0.05, P < 0.01 vs CP group*, ** P < 0.05, P < 0.01 vs Control group; †, †† P < 0.05, P < 0.01 vs CP group Items Group Control CP CP&DADS DADS Stage II Spermatogonia 18.7±1.63a 5.3±3.08** 15.2±3.06†† 18.7±1.21 Pachytene spermatocytes 48.5±3.83 30.0±9.49** 42.2±6.43† 48.0±4.05 Round spermatids 155.0±8.49 152.0±10.45 160.5±13.26 157.0±8.20 Elongated spermatids 151.0±12.00 156.0±8.49 158.2±13.01 150.7±9.50 Sertoli cells 15.8±2.64 19.5±3.27 17.5±2.59 16.8±3.06 Stage V Spermatogonia 33.5±4.51 8.2±5.31** 25.2±7.52†† 34.0±3.95 Pachytene spermatocytes 50.8±5.04 37.3±5.53** 42.3±5.16 51.2±5.38 Round spermatids 150.8±10.94 152.0±10.45 151.8±10.36 150.2±10.28 Elongated spermatids 159.3±8.96 156.0±8.49 165.2±8.04 161.7±6.19 Sertoli cells 16.2±2.48 18.0±2.28 17.2±1.83 16.7±2.73 Stage VII Spermatogonia 1.5±1.64 1.5±1.05 1.8±1.47 2.2±1.17 Preleptotene spermatocytes 37.0±5.22 17.7±5.47** 33.2±7.41†† 37.2±3.66 Pachytene spermatocytes 53.5±6.86 55.2±5.67 52.0±7.67 56.0±4.77 Round spermatids 151.2±8.98 151.8±15.05 152.3±8.78 150.7±8.38 Elongated spermatids 154.2±9.89 150.7±8.62 149.3±10.88 152.5±10.03 Sertoli cells 17.7±1.37 17.2±1.47 17.8±1.33 17.7±1.63 Stage XII Spermatogonia 4.0±1.41 1.3±2.03* 3.7±1.37 3.5±1.52 Zygotene spermatocytes 46.8±4.40 24.7±5.85** 38.7±4.93*,†† 45.2±3.71 Pachytene spermatocytes 59.0±5.51 58.0±5.02 61.0±6.81 57.7±6.65 Elongated spermatids 164.8±5.67 163.2±11.48 159.0±11.90 164.5±5.36 Sertoli cells 17.8±1.72 18.5±1.38 19.3±2.80 17.7±2.07
    25. 25. Figure 2. Representative photographs of TUNEL analysis in testis sections treated CP and/or DADS VC CP DADSCP&DADS ** P < 0.01 vs Control group; †† P < 0.01 vs CP group ** P < 0.01 vs Control group; †† P < 0.01 vs CP group
    26. 26. Figure 3. Representative photographs of immunohistochemical analysis of caspase-3 in testis sections treated CP and/or DADS VC CP DADSCP&DADS ** P < 0.01 vs Control group; †† P < 0.01 vs CP group ** P < 0.01 vs Control group; †† P < 0.01 vs CP group
    27. 27. Figure 4. Western blot analysis of hepatic microsomal CYP2B1/2, CYP2C11, and CYP3A1 expressions in male rats treated with CP and/or DADS. *, ** P < 0.05, P < 0.01 vs Control group; †† P < 0.01 vs CP group*, ** P < 0.05, P < 0.01 vs Control group; †† P < 0.01 vs CP group
    28. 28. Discussion
    29. 29. Cellular damageSperm damage, histopathologic lesions, spermatogenic cell damage, apoptosis Testicular toxicity
    30. 30. Discussion `
    31. 31. Conclusion DADS had protective effects against CP-induced testicular toxicity in rats.  These findings suggest that DADS, which is a naturally occurring antioxidant from commonly consuming plants of allium spices, may be a useful protective agent against various testicular toxicities induced by oxidative stress.
    32. 32. Conclusion CP ROS Production & Oxidative Damage ROS Production & Oxidative Damage Testicular toxicity Phase IPhase I CYPs Acrolein DADSDADS Toxic metabolite Toxic metabolite
    33. 33. Induction of cytochrome P450 3A1 expression by diallyl disulfide: Protective effects against cyclophosphamide-induced embryo-fetal developmental toxicity
    34. 34. Developmental toxicity
    35. 35. Introduction • Effects of pregnancy on CYPs (Maternal liver) Non pregnant Midpregnant Late pregnant (He et al., 2005)
    36. 36. Introduction • Effects of pregnancy on CYPs (Placenta) • Thebandspositivefor CYP1A1, 2B1, 2C6, 2C12, 2D1, 2D4, 2E1and4A1were notdetectedthroughpregnancy. • CYP3A1intheplacenta ismainlydetectedinthecytoplasmofgiantcellsinthe trophoblasticregion, whichisthoughttobeimportant in exchanging manysubstratesbetweenthematernalandfetalcirculation (Okajima etal.,1993). • TheseresultssuggestthatCYP3A1may be amajorcomponentof CYPsystemintheratplacenta. (Ejiri et al., 2001)GD9 GD11 GD13 GD16 GD19 Positive CYP3A1
    37. 37. Conclusion Our results show that DADS has protective effects against CP-induced embryo-fetal developmental toxicity in rats, and that the protective effects of DADS may be due to a reduction in oxidative stress and its ability to promote detoxification of CP by inducing CYP3A1 in the maternal liver and placenta.

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