1. Cell Cycle/DNA Damage Antibody-drug Conjugate/ADC Related Autophagy
  2. Topoisomerase ADC Cytotoxin Autophagy
  3. SN-38

SN-38  (Synonyms: 7-Ethyl-10-hydroxycamptothecin)

Cat. No.: HY-13704 Purity: 99.89%
COA Handling Instructions

SN-38 is an active metabolite of the Topoisomerase I inhibitor Irinotecan. SN-38 inhibits DNA and RNA synthesis with IC50s of 0.077 and 1.3 μM, respectively.

For research use only. We do not sell to patients.

SN-38 Chemical Structure

SN-38 Chemical Structure

CAS No. : 86639-52-3

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10 mM * 1 mL in DMSO
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Customer Review

Based on 32 publication(s) in Google Scholar

Other Forms of SN-38:

Top Publications Citing Use of Products

32 Publications Citing Use of MCE SN-38

  • Biological Activity

  • Protocol

  • Purity & Documentation

  • References

  • Customer Review

Description

SN-38 is an active metabolite of the Topoisomerase I inhibitor Irinotecan. SN-38 inhibits DNA and RNA synthesis with IC50s of 0.077 and 1.3 μM, respectively[1][2][3][4].

IC50 & Target[1]

Topoisomerase I

 

Camptothecins

 

In Vitro

The IC50 values for LoVo, HCT116, and HT29 cell lines is 20 nM, 50 nM, 130 nM, respectively. In all three SN-38 resistant cell lines Top1 activity is maintained in the presence of high concentrations of SN-38[2].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

In Vivo

SN-38, the active and toxic metabolite of the anticancer prodrug Irinotecan. At 30 minutes after administration, Irinotecan plasma concentrations in Slco1a/1b(−/−) mice are 1.9-fold higher than in the wild-type mice (1.89 vs. 1.01 μM, respectively), whereas SN-38 plasma concentrations of Slco1a/1b(−/−) mice are 8-fold higher compare with wild-type mice (0.4 μg/mL vs. 0.05 μg/mL, respectively). Overall plasma exposure [AUC(5-240)] of Irinotecan is 1.7-fold higher in Oatp1a/1b knockout mice versus wild-type mice (209.8±6.7 vs. 120.9±4.4 μM/min; P<0.01), and 2.9-fold higher for SN-38 (50±2.9 vs. 12±2 μM/min; P<0.001)[3].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

Clinical Trial
Molecular Weight

392.40

Formula

C22H20N2O5

CAS No.
Appearance

Solid

Color

Off-white to yellow

SMILES

O=C1[C@](O)(CC)C2=C(CO1)C(N3CC4=C(CC)C5=CC(O)=CC=C5N=C4C3=C2)=O

Structure Classification
Initial Source
Shipping

Room temperature in continental US; may vary elsewhere.

Storage
Powder -20°C 3 years
4°C 2 years
In solvent -80°C 1 year
-20°C 6 months
Solvent & Solubility
In Vitro: 

DMSO : 25 mg/mL (63.71 mM; Need ultrasonic)

Preparing
Stock Solutions
Concentration Solvent Mass 1 mg 5 mg 10 mg
1 mM 2.5484 mL 12.7421 mL 25.4842 mL
5 mM 0.5097 mL 2.5484 mL 5.0968 mL
10 mM 0.2548 mL 1.2742 mL 2.5484 mL
*Please refer to the solubility information to select the appropriate solvent.
In Vivo:
  • 1.

    Add each solvent one by one:  10% DMSO    90% Corn Oil

    Solubility: 2.5 mg/mL (6.37 mM); Suspended solution; Need ultrasonic

  • 2.

    Add each solvent one by one:  10% DMSO    40% PEG300    5% Tween-80    45% Saline

    Solubility: 2.08 mg/mL (5.30 mM); Suspended solution; Need ultrasonic

  • 3.

    Add each solvent one by one:  10% DMSO    90% (20% SBE-β-CD in Saline)

    Solubility: 2.08 mg/mL (5.30 mM); Suspended solution; Need ultrasonic

*All of the co-solvents are available by MedChemExpress (MCE).
Purity & Documentation

Purity: 99.89%

References
Cell Assay
[2]

In vitro SN-38 sensitivity is determined using the MTT assay. Cells are seeded in 96-well plates, and a range of SN-38 concentrations is added the following day. Following 48 h of drug exposure, the medium is discarded and the plates are incubated with medium containing MTT (0.5 mg/mL) for 3 h. Acidified (0.02 M HCl) sodium dodecyl sulphate (20 %) is added to dissolve the formed formazan. Optical density at 570 nm (and 670 nm for background) is measured, and the cell viability is calculated in percent compared to untreated cells. Experiments are repeated three times and the mean IC50 value ± standard deviation is determined. Relative resistance for each resistant cell line is calculated by dividing the mean IC50 value of the resistant cell line by the mean IC50 value of the corresponding parental cell line[2].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Animal Administration
[3]

Mice[3]
Female wild-type, Slco1a/1b(−/−)(Oatp1a/1b knockout), Slco1a/1b(−/−);1B1(tg), and Slco1a/1b(−/−);1B3(tg) (liver-specific OATP1B1 and OATP1B3 humanized transgenic) mice of comparable genetic background (>99% FVB) between 8 and 14 weeks of age are used. Irinotecan (20 mg/mL in water-based solution containing NaOH, lactic acid, and sorbitol) is diluted with saline (to 2 mg/mL) for administration of 10 mg/kg; 5 μL/g bodyweight are administered intravenously to mice. SN-38 is dissolved in DMSO (1 mg/mL) and 1 μL/g body weight is administered intravenously to mice to achieve a dosage of 1 mg/kg. The experiments are terminated by isoflurane anaesthesia, heparin-blood sampling by cardiac puncture followed by cervical dislocation and tissue collection. Blood samples are centrifuged at 5,200 × g for 5 minutes at 4°C and plasma is collected and stored at −30°C until analysis.

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

References
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Help & FAQs
  • Do most proteins show cross-species activity?

    Species cross-reactivity must be investigated individually for each product. Many human cytokines will produce a nice response in mouse cell lines, and many mouse proteins will show activity on human cells. Other proteins may have a lower specific activity when used in the opposite species.

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SN-38
Cat. No.:
HY-13704
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