Chloroquine Phosphate

Catalog No.S4157

Chloroquine Phosphate Chemical Structure

Molecular Weight(MW): 515.86

Chloroquine phosphate is a 4-aminoquinoline anti-malarial and anti-rheumatoid agent, also acting as an ATM activator.

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3 Customer Reviews

  • NCI-H929 EV and miR-137 OE cells were treated with ATM activator Chloroquine Phosphate (CQ), specific ATM inhibitor KU-55933, and ATR inhibitor AZ20 for 12 hr. Immunoblotting showed the expression of p-ATM, p-Chk2, p-BRCA1, p-ATR and p-Chk1.

    Leukemia, 2017, 31(5):1123-1135. Chloroquine Phosphate purchased from Selleck.

    Cells were pre-treated with rapamycin (Rapa, 1 μM) for 12 h, or KRIBB3 (KR, 0.5 μM) or chloroquine (CQ, 10 μM) for 2 h, followed by treatment with of palmitate (PA, 150 μM) for 24 h. Then the lipid in L02 cells was observed with Oil Red O (ORO) staining and ORO absorbance detection. Values are means ± SD (n = 3), *p b 0.05, versus matched controls.

    Cell Signal, 2016, 28(8):1086-98. . Chloroquine Phosphate purchased from Selleck.

  • Rapamycin aggravates the autophagic reaction induced by CVB3 infection. HeLa cells were treated with 10 nM rapamycin and chloroquine phosphate (CQ group) for 2 h. The cells were washed thrice and infected with CVB3. In the CVB3 group, HeLa cells were incubated with DMEM containing 10% FBS for 2 h and infected with CVB3. The sham group was incubated with DMEM containing 10% FBS. Two hours later, the medium was refreshed with DMEM containing 2% FBS. At 24 h.p.i., cells were collected for western blot analysis. The LC3-II/LC3-I ratio was increased in the CVB3 and rapamycin group (p<0.01), and p-mTOR was decreased in the CVB3 group (p<0.05) and rapamycin group (p<0.01) compared with the sham group. The changes in the LC3-II/LC3-I ratio and p-mTOR were more obvious in the Rap group compared with the CVB3 group (p<0.05). The LC3-II/LC3-I ratio and p62 was increased in the CQ group compared with the CVB3 group (p<0.05). *p<0.05, compared with the sham group; **p<0.01, compared with the sham group; #p<0.05, compared with the CVB3 group. CVB3, coxsackievirus B3; DMEM, Dulbecco's modified Eagle's medium; FBS, fetal bovine serum; h.p.i., hours post-inoculation; LC3, light chain 3; mTOR, mammalian target of rapamycin.

    Int J Mol Med, 2017, 40(1):182-192. Chloroquine Phosphate purchased from Selleck.

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Biological Activity

Description Chloroquine phosphate is a 4-aminoquinoline anti-malarial and anti-rheumatoid agent, also acting as an ATM activator.
ATM [1]
(Cell-free assay)
In vitro

Chloroquine is a chemotherapeutic agent for the clinical treatment of malaria. Chloroquine is able to bind to DNA, and inhibit DNA replication and RNA synthesis which in turn results in cell death. The effect of Chloroquine may also be related to the formation of a toxic heme-Chloroquine complex. Chloroquine inhibits trophozoite hemoglobin degradation through increasing vacuolar pH and inhibiting the activity of vacuolar phospholipase, vacuolar proteases, and heme polymerase[1]. Chloroquine possesses definite antirheumatic properties. Chloroquine has immuno-modulatory effects, suppressing the production/release of tumour necrosis factor and interleukin 6. Moreover, Chloroquine exerts direct antiviral effects, inhibiting pH-dependent steps of the replication of several viruses including members of the flaviviruses, retroviruses, and coronaviruses. Its best-studied effects are those against HIV replication[2]. Chloroquine can accumulate inside the macrophage phagolysosome by ion trapping where it exerts potent antifungal activity against Histoplasma capsulatum and Cryptococcus neoformans by distinct mechanisms. Chloroquine inhibits growth of H. capsulatum by pH-dependent iron deprivation, whereas it is directly toxic to C. neoformans[3].

Cell Data
Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
human K562 cells M1;RWmN6fG:2b4jpZ:Kh[XO|YYm= NGPHW5JEgXSxdH;4bYNqfHliYXfhbY5{fCCqdX3hckBMPTZ{IHPlcIx{KGK7IF3UWEBie3OjeTygTWM2OD1|MT64N{BvVQ>? M13qR|E5PTN6NU[3
human KB cells Moj5R5l1d3SxeHnjxsBie3OjeR?= M1;FSmN6fG:2b4jpZ4l1gSCjZ3HpcpN1KGi3bXHuJGtDKGOnbHzzJIJ6KG2rY4LvdIxifGVibXX0bI9lNCCLQ{WwQVAvPiEQvF2= M3\Gb|E1PjRyNUK0
human MDA-MB-468 cells M{X5WWN6fG:2b4jpZ:Kh[XO|YYm= M3HrTlQ5KGh? NELCeWREgXSxdH;4bYNqfHliYXfhbY5{fCCqdX3hckBOTEFvTVKtOFY5KGOnbHzzJIFnfGW{IES4JIhzeyCkeTDTVmIh[XO|YYmgbY4heHKnc3XuZ4Uhd2ZiMz61JJVOKDRvKEKtZ4htd3KxLUGwTE1xcGWwb4jhfolvNTFyLYnsLU1PNE5vZHnleIh6dGK3dHHuMVEu[W2rbnWgbJllem:laHzvdoll\SxiR1m1NF0zNjhzIN88US=> NFzOZ|cyQTl2NUG5Oy=>
human MCF7 cells NI[5VmlEgXSxdH;4bYPDqGG|c3H5 M{niRlQ5KGh? NUTSfpNmS3m2b4TvfIlkcXS7IHHnZYlve3RiaIXtZY4hVUOINzDj[YxteyCjZoTldkA1QCCqcoOgZpkhW1KEIHHzd4F6KGmwIIDy[ZNmdmOnIH;mJFAvPCC3TTCxMUgyNSh2LTi3MZBp\W67bD2xTE1qdWmmYYrvX|QtPS2pXYH1bY5wgGGuaX6tOk16dCmkZX76fYwqeGmyZYLp[IlvNTRveXypMVFJNWKnborvX4RecW2rZHH6c4wuOih|SDmtc45mNCCJSUWwQVUvPTFizszN NHfoNHoyQTl2NUG5Oy=>
human MDA-MB-231 cells NHjafmZEgXSxdH;4bYPDqGG|c3H5 NGH3XXc1QCCq Moi4R5l1d3SxeHnjbZR6KGGpYXnud5QhcHWvYX6gUWRCNU2ELUKzNUBk\WyuczDh[pRmeiB2ODDodpMh[nliU2LCJIF{e2G7IHnuJJBz\XOnbnPlJI9nKDNwNTD1UUA1NSh{LXPocI9zdy1zMFitdIhmdm:6YYrpck0yOC27bDmtUkxPNWSrZYTofYxjfXSjbj2xMYFucW6nIHj5[JJw[2iub4Lp[IUtKEeLNUC9Ok4xQCEQvF2= MkK3NVk6PDVzOUe=
human HeLa cells MVnDfZRwfG:6aXRCpIF{e2G7 NYf6VYprS3m2b4TvfIlkcXS7IHHnZYlve3RiaIXtZY4hUGWOYTDj[YxteyCjc4Pld5Nm\CCjczDndo94fGhiaX7obYJqfGmxbjDifUBOXFRiYYPzZZktKEmFNUC9N|Ah|ryP MXmyOFM2PDN{Mh?=
human HepG2 cells MkDlR5l1d3SxeHnjxsBie3OjeR?= MmTIOFghcA>? NV;YcYd2S3m2b4TvfIlkcXS7IHHnZYlve3RiaIXtZY4hUGWyR{KgZ4VtdHNiYX\0[ZIhPDhiaILzJIJ6KE2WVDDhd5NigSxiSVO1NF0{Py54ODFOwG0> M{HxUFI{QDF3MUi2

... Click to View More Cell Line Experimental Data


Solubility (25°C)

In vitro Water 100 mg/mL (193.85 mM)
DMSO Insoluble
Ethanol Insoluble

* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.

Chemical Information

Molecular Weight 515.86


CAS No. 50-63-5
Storage powder
in solvent
Synonyms N/A

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Clinical Trial Information

NCT Number Recruitment Conditions Sponsor/Collaborators Start Date Phases
NCT02432417 Not yet recruiting Glioblastoma|Astrocytoma Grade IV Maastricht Radiation Oncology January 2020 Phase 2
NCT03503058 Not yet recruiting Malaria Sanaria Inc.|Eijkman Oxford Clinical Research Unit Eijkman Institute|Indonesia University|Congressionally Directed Medical Research Programs March 2019 Phase 2
NCT03636152 Not yet recruiting Chronic Kidney Disease|Cardiovascular Disease|Inflammation|Atherosclerosis|Aortic Stiffness VA Office of Research and Development December 3 2018 Phase 2
NCT03687905 Recruiting Proliferative Nephritis|Chloroquine Retinopathy Tanta University September 18 2018 --
NCT03278808 Recruiting Malaria U.S. Army Medical Research and Materiel Command September 17 2018 Phase 2
NCT03592823 Recruiting Atrial Fibrillation First Affiliated Hospital of Harbin Medical University August 1 2018 Phase 4

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID