Name: FK506 (Tacrolimus)
Brand: Selleck Chemicals
SKU: S5003
Availability: InStock
Rating: 5 (113 reviews)

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Quality Control

Batch: Purity: 99.97%

99.97

Related Targets	PI3K Akt mTOR GSK-3 ATM/ATR DNA-PK AMPK PDPK1 PTEN PP2A
Other FKBP Products	Shield-1 Rimiducid (AP1903) dTAG-13 AP20187 (B/B Homodimerizer) S107 hydrochloride dTAGV-1 TFA SAFit2 FKBP12 Antibody [H17G5]

Cell Culture, Treatment & Working Concentration

Cell Lines	Assay Type	Incubation Time	Activity Description	PMID
human U251 cells	Function assay		Inhibition of SAP130 in VEGF-stimulated human U251 cells by PLAP reporter gene assay, IC50=13.8 nM	17643112
human WiDr cells	Growth inhibition assay		Inhibition of SAP130 mediated cell growth in human WiDr cells, IC50=10.9 nM	17643112
human T-cell	Proliferation assay		In vitro inhibitory activity against human T-cell proliferation, IC50=0.5 nM	7537331
rat RBL2H3 cells	Function assay	15 mins	Antiinflammatory activity in rat RBL2H3 cells assessed as inhibition of DNP-BSA-induced TNF-alpha production preincubated for 15 mins prior DNP-BSA challenge measured after 30 mins by ELISA, IC50=0.25 nM	22410084
rat RBL2H3 cells	Function assay	16 h	Inhibition of TNF-alpha production in rat RBL2H3 cells after 16 hrs by ELISA, IC50=0.25 nM	23791076
PBMCs	Function assay		Inhibitory activity against IFN-gamma production (Anti-CD3 monoclonal antibody stimulated and cultured CD4 positive cells purified from human peripheral blood mononuclear cell), IC50 = 0.00006 μM.	15369399
PBMCs	Function assay		Inhibitory activity against IL-5 production (Anti-CD3 monoclonal antibody stimulated and cultured CD4 positive cells purified from human peripheral blood mononuclear cell), IC50 = 0.00006 μM.	15369399
T-cells	Function assay		The compound was tested for its inhibitory activity against T-cell proliferation using murine splenic T-cells, IC50 = 0.0002 μM.	10450987
RBL-2H3	Function assay		Inhibition of DNP7-BSA antigen-induced TNFalpha release in rat RBL-2H3 cells, IC50 = 0.00025 μM.	16901696
Jurkat T	Immunosuppressive assay	15 to 30 mins	Immunosuppressive activity in PMA/ionomycin stimulated human Jurkat T cells assessed as suppression of IL2 production pretreated for 15 to 30 mins followed by PMA/ionomycin addition measured after 18 to 20 hrs by ELISA, IC50 = 0.36 μM.	28412204
HEK293	Function assay		TP_TRANSPORTER: inhibition of Phalloidin uptake (Phalloidin: 1 uM) in OATP-C-expressing HEK293 cells, IC50 = 3.7 μM.	14530907
Jurkat T	Antiinflammatory assay	20 mins	Anti-inflammatory activity in PMA/ionomycin stimulated human Jurkat T cells assessed as reduction in IL-2 secretion preincubated for 20 mins followed by PMA/ionomycin stimulation measured after 12 hrs by ELISA, IC50 = 5.8 μM.	28509552
Click to View More Cell Line Experimental Data

Solubility

In vitro
Batch:

DMSO : 120 mg/mL (149.25 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO.)

Ethanol : 100 mg/mL

Water : Insoluble

Molarity Calculator

Mass	Concentration	Volume	Molecular Weight
Mass value Mass unit	Concentration value Concentration unit	Volume value Volume unit	Molecular weight (g/mol)

Dilution Calculator Molecular Weight Calculator

In vivo batch selection In vivo Batch:
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Clear solution	5% DMSO 1 corn oil Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	5.000mg/ml (6.22mM)	Taking the 1 mL working solution as an example, add 50 μL of 100 mg/ml clarified DMSO stock solution to 950 μL of corn oil and mix evenly. The mixed solution should be used immediately for optimal results.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Clear solution	5%DMSO 1 40%PEG300 2 5%Tween80 3 50%ddH2O Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	5.000mg/ml (6.22mM)	Taking the 1 mL working solution as an example, add 50 μL of 100 mg/ml clarified DMSO stock solution to 400 μL of PEG300, mix evenly to clarify it; add 50 μL of Tween80 to the above system, mix evenly to clarify; then continue to add 500 μL of ddH2O to adjust the volume to 1 mL. The mixed solution should be used immediately for optimal results.
Clear solution	5% DMSO 1 95% Corn oil Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	2.500mg/ml (3.11mM)	Taking the 1 mL working solution as an example, add 50 μL of 50 mg/ml clear DMSO stock solution to 950 μL of corn oil and mix evenly. The mixed solution should be used immediately for optimal results.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Clear solution	5%DMSO 1 40%PEG 300 2 5%Tween80 3 50% ddH2O Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	5.000mg/ml (6.22mM)	Taking the 1 mL working solution as an example, add 50 μL of 100 mg/mL clarified DMSO stock solution to 400 μL of PEG300, mix evenly to clarify; add 50 μL of Tween-80 to the above system, mix evenly to clarify; Then continue to add 500 μL ddH2O to adjust the volume to 1 mL. The mixed solution should be used immediately for optimal results.
Clear solution	5%DMSO 1 95% Corn oil Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	5.000mg/ml (6.22mM)	Taking the 1 mL working solution as an example, add 50 μL of 100 mg/ml clarified DMSO stock solution to 950 μL of corn oil and mix evenly. The mixed solution should be used immediately for optimal results.

In vivo Formulation Calculator (Clear solution)

Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment)

Dosage: mg/kg

Average weight of animals: g

Dosing volume per animal: μL

Number of animals:

Step 2: Enter the in vivo formulation (This is only the calculator, not formulation. Please contact us first if there is no in vivo formulation at the solubility Section.)

% DMSO

%

% Tween 80

% ddH₂O

% DMSO

+

%

Calculation results:

Working concentration: mg/ml;

Method for preparing DMSO master liquid: mg drug pre-dissolved in μL DMSO ( Master liquid concentration mg/mL, Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug. )

Method for preparing in vivo formulation: Take μL DMSO master liquid, next addμL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH₂O, mix and clarify.

Method for preparing in vivo formulation: Take μL DMSO master liquid, next add μL Corn oil, mix and clarify.

Note: 1. Please make sure the liquid is clear before adding the next solvent.
2. Be sure to add the solvent(s) in order. You must ensure that the solution obtained, in the previous addition, is a clear solution before proceeding to add the next solvent. Physical methods such
as vortex, ultrasound or hot water bath can be used to aid dissolving.

Chemical Information, Storage & Stability

Molecular Weight	804.02	Formula	C₄₄H₆₉NO₁₂	Storage (From the date of receipt)	3 years-20°Cpowder
CAS No.	104987-11-3	Download SDF		Storage of Stock Solutions	1 year-80°Cin solvent 1 month-20°Cin solvent
Synonyms	FR900506, Fujimycin			Smiles	CC1CC(C2C(CC(C(O2)(C(=O)C(=O)N3CCCCC3C(=O)OC(C(C(CC(=O)C(C=C(C1)C)CC=C)O)C)C(=CC4CCC(C(C4)OC)O)C)O)C)OC)OC

Mechanism of Action

Targets/IC₅₀/Ki	FKBP12 (T cells) calcineurin
In vitro	Tacrolimus (FK506) and cyclosporin A block translocation of the cytoplasmic component without affecting synthesis of the nuclear subunit in T lymphocytes. This compound prevents T-cell proliferation by inhibiting a Ca(2+)-dependent event required for induction of interleukin-2 transcription. It binds to distinct families of intracellular proteins (immunophilins) termed cyclophilins and FK 506-binding proteins (FKBPs). Tacrolimus specifically inhibits cellular calcineurin at drug concentrations that inhibit interleukin 2 production in activated T cells. It and CsA exert nearly identical biological effects in cells by inhibiting the same subset of early calcium-associated events involved in lymphokine expression, apoptosis, and degranulation. This compound binds to a family of intracellular receptors termed the FK-506 binding proteins (FKBPs).
In vivo	Tacrolimus (FK506) results in an increase in the paw and tail withdrawal threshold as revealed by behavioral pain assessment in rats against hyperalgesic and allodynic stimuli. It also leads to a decrease in the serum nitrate and thiobarbituric acid reactive substance (TBARS) levels along with reduction in tissue myeloperoxidase (MPO) and total calcium levels, whereas, rise in tissue reduced glutathione levels in rats. This compound ameliorates the increase in the neuronal edema and axonal degeneration in rats with ischemia reperfusion (I/R).
References	[1] https://pubmed.ncbi.nlm.nih.gov/1715516/ [2] https://pubmed.ncbi.nlm.nih.gov/1377361/ [3] https://pubmed.ncbi.nlm.nih.gov/1373887/ [4] https://pubmed.ncbi.nlm.nih.gov/7509138/ [5] https://pubmed.ncbi.nlm.nih.gov/20529260/ [6] https://pubmed.ncbi.nlm.nih.gov/18574318/ [7] https://pubmed.ncbi.nlm.nih.gov/29863266/ [8] https://pubmed.ncbi.nlm.nih.gov/22130237/

Applications

Methods	Biomarkers	PMID
Western blot	GluA1 / pGluA1(S845) / GluA2 / GluA3 / Calcineurin p-JNK / JNK / p-ERK / ERK / Cytochrome c / cleaved caspase-3 p-S6K(S371) / S6K / p-Erα(S167) / Erα	26455952
Immunofluorescence	FKBP52 / p23 / hsp90 FKBP51 Tom20 / JC-1 / ROS / NF-κB	20796173
Growth inhibition assay	Cell viability	23470533

Clinical Trial Information

(data from https://clinicaltrials.gov, updated on 2024-05-22)

NCT Number	Recruitment	Conditions	Sponsor/Collaborators	Start Date	Phases
NCT05702931	Not yet recruiting	Hyperglycemia\|Renal Transplant Complication Primary Non-Function\|Diabetes	Rigshospitalet Denmark\|Aarhus University Hospital\|Odense University Hospital	April 1 2024	Phase 4
NCT06268769	Recruiting	Immunosuppression	Edward Geissler\|Chiesi Pharmaceuticals GmbH\|University of Regensburg	March 9 2024	Phase 4
NCT06326775	Active not recruiting	Heart Transplant Patients	Nanjing First Hospital Nanjing Medical University\|Wuhan Union Hospital China\|Changhai Hospital\|Shanghai Zhongshan Hospital	March 12 2024	--
NCT06235892	Not yet recruiting	Organ Grafts	Nantes University Hospital	February 10 2024	Phase 3

Tech Support

Handling Instructions

Tel: +1-832-582-8158 Ext:3

If you have any other enquiries, please leave a message.

Frequently Asked Questions

Question 1:
We would like to inject it subcutaneously into rats. Can we mix it with 5% dextrose to a concentration of 5mg/ml to prepare the solution?

Answer:
You can dissolve it with DMSO to prepare the stock solution, and then dilute by 5% dextrose. However, we don't have the information about the solubility in this condition. Or you can use the vehicle we tested: 30% PEG400/0.5% Tween80/5% propylene glycol (Solubility: 30mg/ml).

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FK506 (Tacrolimus) Calcineurin inhibitor

Chemical Structure

Molecular Weight: 804.02