2. Signaling Pathways
  3. Apoptosis
  4. MDM-2/p53

MDM-2/p53

MDM-2/p53

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The p53 tumor suppressor is a principal mediator of growth arrest, senescence, and apoptosis in response to a broad array of cellular damage. p53 is a short-lived protein that is maintained at low, often undetectable, levels in normal cells. Under stress conditions, the p53 protein accumulates in the cell, binds in its tetrameric form to p53-response elements and induces the transcription of various genes.

MDM-2 is transcriptionally activated by p53 and MDM-2, in turn, inhibits p53 activity in several ways. MDM-2 binds to the p53 transactivation domain and thereby inhibits p53-mediated transactivation. MDM-2 also contains a signal sequence that is similar to the nuclear export signal of various viral proteins and, after binding to p53, it induces its nuclear export. As p53 is a transcription factor, it needs to be in the nucleus to be able to access the DNA; its transport to the cytoplasm by MDM-2 prevents this. Finally, MDM-2 is a ubiquitin ligase, so is able to target p53 for degradation by the proteasome.

In many tumors p53 is inactivated by the overexpression of the negative regulators MDM2 and MDM4 or by the loss of activity of the MDM2 inhibitor ARF. The pathway can be reactivated in these tumors by small molecules that inhibit the interaction of MDM2 and/or MDM4 with p53. Such molecules are now in clinical trials.

Cat. No. Product Name Effect Purity Chemical Structure
  • HY-113041
    Prostaglandin A2
    		p53 Activator 99.9%
    Prostaglandin A2 (PGA2) is a Cyclopentenone prostaglandin. Prostaglandin A2 induces Caspase-dependent Apoptosis, activates p53. Prostaglandin A2 activates ERK2 and JNK1/SAPK. Prostaglandin A2 shows antiviral activity against HSV-1. Prostaglandin A2 has anti-tumor effects. Prostaglandin A2 can be used for the research of colorectal cancer, colorectal carcinoma, breast carcinoma, and herpetic keratitis.
    Prostaglandin A2
  • HY-156135
    NSC194598
    		p53 Inhibitor 98.90%
    NSC194598 is a p53 DNA-binding inhibitor with an IC50 value of 180 nM. NSC194598 inhibits p53 DNA binding and induction of target genesn when p53 is stabilized and activated by irradiation or chemotherapy. NSC194598 can interfere with transcriptional activation of mutated rearranged during transfection (RET) gene, induce apoptosis and G0/G1 phase arrest. NSC194598 can be used for the researches of acute radiation toxicity and medullary thyroid carcinoma.
    NSC194598
  • HY-122578
    P53R3
    		p53 Inhibitor 99.93%
    P53R3 is a potent p53 reactivator and restores sequence-specific DNA binding of p53 hot spot mutants, including p53R175H, p53R248W and p53R273H. P53R3 induces p53-dependent antiproliferative effects with much higher specificity than PRIMA-1. P53R3 enhances the recruitment of wild-type p53 and p53M237I to several target gene promoters. P53R3 strongly enhances the mRNA, total protein and cell surface expression of the death receptor death receptor 5 (DR5). P53R3 is used for cancer research.
    P53R3
  • HY-14714
    NSC-207895
    		p53 Activator 98.85%
    NSC-207895 (XI-006), a DNA damaging agent, is an anticancer agent and p53 activator.
    NSC-207895
  • HY-143692
    SQDG
    		p53 Activator 99.0%
    SQDG inhibits topoisomerase I and P-selectin receptor, exhibits anti-inflammatory, antiviral and antitumor activities. SQDG is a glycolipid that possesses sugar moieties in their head groups. SQDG is a membrane lipid that can be used to investigate the effects of structural lipid in LNP formulations.
    SQDG
  • HY-N7271
    Solanidine
    		Activator 99.90%
    Solanidine is an orally active cholestane alkaloid. Solanidine can be isolated from potato. Solanidine decreases RAD51 and increases γH2AX and p53. Solanidine has anti-tumor effects on LLC tumors and lung cancer. Solanidine promotes breast cancer cell proliferation. Solanidine reduces neovascularization. Solanidine causes abortion in some pregnant mice.
    Solanidine
  • HY-N0726
    Dracorhodin perchlorate
    		Activator 99.02%
    Dracorhodin perchlorate (Dracohodin perochlorate) is a natural product that can be obtained from the natural active molecule Dragon's blood. Dracorhodin perchlorate inhibits PI3K/Akt and NF-κB activation, upregulates p53 expression, activates caspase, produces ROS, and promotes Apoptosis. Dracorhodin perchlorate regulates the TLR4. Dracorhodin perchlorate promotes wound healing, improves diabetes. Dracorhodin perchlorate has anti-tumor activity against prostate cancer, breast cancer, cervical cancer and other cancers.
    Dracorhodin perchlorate
  • HY-B0960
    Sulfabenzamide
    		99.68%
    Sulfabenzamide (N-Sulfanilylbenzamide) is a sulfonamide antibacterial agent. Sulfabenzamide exhibit antibacterial activity against Staphylococcus aureus (ATCC 25923) and Escherichia coli (ATCC 8739). Sulfabenzamide can promote autophagic cell autophagy in breast cancer cells through p53/ DRAM pathway. Sulfabenzamide increases caspase-3 activity, deactivates PARP1 and DNA-PK, downregulates AKT1 and AKT2. Sulfabenzamide can be used for the researches of breast cancer and bacterial infections.
    Sulfabenzamide
  • HY-130684
    MDM2 ligand 5
    		Ligand 98.02%
    MDM2 ligand 5 is a Ligand for E3 Ligase that can be used for the synthesis of PROTACs.
    MDM2 ligand 5
  • HY-112440
    HZX-02-059
    		Inhibitor 99.40%
    HZX-02-059 is a potent methuosis inducer and dual-target PIKfyve/tubulin inhibitor with anticancer activity. Methuosis mainly disrupts the balance of endocytosis and exocytosis, forming a large number of vesicles and inducing cell death. HZX-02-059 also induces cell vacuolization, promotes apoptosis, downregulates the p53 pathway, inhibits PI3K/AKT phosphorylation, and inhibits c-Myc and NF-κB transcription.
    HZX-02-059
  • HY-160922
    BAY 249716
    		99.03%
    BAY 249716 stabilizes all three p53 protein variants. BAY 249716 also has antitubercular activity (IC90: <0.10 μg/mL for Tuberculosis).
    BAY 249716
  • HY-148416
    p53 Activator 7
    		p53 Activator 98.22%
    p53 Activator 7 is a p53 mutation Y220C (MDM-2/p53) activator with an EC50 of 104 nM. p53 Activator 7 can bind to p53 mutant and restore its ability to bind DNA (WO2022213975A1; Example B-1). p53 Activator 7 is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.
    p53 Activator 7
  • HY-N0392
    Polygalasaponin F
    		Inhibitor 99.85%
    Polygalasaponin F is an orally active triterpenoid saponin monomer. Polygalasaponin F downregulates the expression of Bax, p53, caspase-3, NF-κB p65 and MEK1; restores and upregulates the expression of Bcl-2; activates the PI3K/Akt signaling pathway; inhibits the phosphorylation of p38 MAPK, nuclear translocation of NF-κB, TLR4-mediated signaling pathway, mitophagy (Mitophagy) and ROS production; enhances cell viability and suppresses apoptosis (Apoptosis). Polygalasaponin F maintains mitochondrial function, alleviates Ca2+ overload, upregulates pCREB and BDNF, preserves cell viability and inhibits the release of inflammatory cytokines. Polygalasaponin F alleviates lung injury induced by influenza A H1N1 and cerebral ischemia-reperfusion injury. Polygalasaponin F is applicable to researches related to Parkinson's disease, cerebral ischemia, pneumonia induced by influenza A H1N1, stroke and Alzheimer's disease.
    Polygalasaponin F
  • HY-N0909
    Notoginsenoside R2
    		Activator 99.80%
    Notoginsenoside R2 (20(S)-Notoginsenoside R2; Ginsenoside Ng-R2) is an orally active notoginsenoside. Notoginsenoside R2 activates P90RSK and Nrf2 via the MEK1/2-ERK1/2 pathway to inhibit 6-OHDA-induced apoptotic damage in nerve cells. Notoginsenoside R2 upregulates SOX8/β-catenin by reducing miR-27a, thereby suppressing Aβ25-35-induced neuronal apoptosis and inflammatory responses. Notoginsenoside R2 alleviates lipid accumulation and mitochondrial dysfunction in diabetic nephropathy by inhibiting c-Src. Notoginsenoside R2 alleviates hepatic fibrosis by inducing hepatic stellate cell senescence and inhibiting the inflammatory microenvironment via JAK/STAT3 suppression. Notoginsenoside R2 can be used in research related to Parkinson's disease, Alzheimer's disease, diabetic nephropathy and hepatic fibrosis.
    Notoginsenoside R2
  • HY-W013053
    Dibenz[a,h]anthracene
    		98.0%
    Dibenz[a,h]anthracene (DBA) is an orally active polycyclic aromatic hydrocarbon, a by-product of incomplete combustion of organic matter, a potent carcinogen, and an agonist of AhR. Dibenz[a,h]anthracene induces dose-dependent increases in DNA adduct formation and lacZ mutation frequency. Dibenz[a,h]anthracene upregulates St3gal5. Dibenz[a,h]anthracene can be used in cancer-related research.
    Dibenz[a,h]anthracene
  • HY-N3677
    Dammarenediol II
    		Activator 99.81%
    Dammarenediol II is a ginsenoside precursor. Dammarenediol II reduces the activity of O-GlcNAc transferase (OGT) and downregulates the global O-GlcNAcylation level. Dammarenediol II inhibits the phosphorylation of Akt, mTOR and GSK3β. Dammarenediol II inhibits human carboxylesterase activity, VEGF-induced ROS production, stress fiber formation and vascular endothelial cadherin disruption. Dammarenediol II promotes cell apoptosis (apoptosis), increases the levels of cleaved PARP1 and p53, and inhibits retinal microvascular leakage. Dammarenediol II can be used in studies related to liver cancer and diabetic retinopathy.
    Dammarenediol II
  • HY-125858
    MI-1061
    		MDM2 Inhibitor 99.08%
    MI-1061 is a potent, orally bioavailable, and chemically stable MDM2 (MDM2-p53 interaction) inhibitor (IC50=4.4 nM; Ki=0.16 nM). MI-1061 potently activates p53 and induces apoptosis in the SJSA-1 xenograft tumor tissue in mice. Anti-tumor activity.
    MI-1061
  • HY-148369
    U7D-1
    		p53 Activator 99.68%
    U7D-1 is a first-in-class potent and selective USP7 (ubiquitin-specific protease 7) PROTAC degrader, with a DC50 of 33 nM in RS4;11 cells. U7D-1 shows anticancer activity. U7D-1 induces apoptosis in Jeko-1 cells.
    U7D-1
  • HY-15510B
    Tenovin-6 Hydrochloride
    		p53 Activator 98.88%
    Tenovin-6 Hydrochloride, an analog of Tenovin-1 (HY-13423), is an activator of p53 transcriptional activity. Tenovin-6 Hydrochloride inhibits the protein deacetylase activities of purified human SIRT1, SIRT2, and SIRT3 with IC50s of 21 μM, 10 μM, and 67 μM, respectively. Tenovin-6 Hydrochloride also inhibits dihydroorotate dehydrogenase (DHODH).
    Tenovin-6 Hydrochloride
  • HY-P10387
    RSM3
    		Modulator
    RSM3 is a METTL3-METTL14 complex inhibitor with a Kd of 3.10 μM for the METTL3-METTL14 complex. RSM3 reduces the m6A modification level of SLC31A1 and the global RNA methylation level. RSM3 upregulates programmed cell death-related genes, enhances cell apoptosis, inhibits pro-cancer signals and suppresses tumor growth. RSM3 is applicable to the research of preeclampsia and cancer.
    RSM3
Cat. No. Product Name / Synonyms Application Reactivity
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Download MDM-2/p53 Signaling Pathway Map.

p53 is at the centre of biological interactions that translates stress signals into cell cycle arrest or apoptosis. Upstream signaling to p53 increases its level and activates its function as a transcription factor in response to a wide variety of stresses, whereas downstream components execute the appropriate cellular response. 

 

Cell Stress: p53 induction by acute DNA damage begins when DNA double-strand breaks trigger activation of ATM, a kinase that phosphorylates the CHK2 kinase, or when stalled or collapsed DNA replication forks recruit ATR, which phosphorylates CHK1. p53 is a substrate for both the ATM and ATR kinases, as well as for CHK1 and CHK2, which coordinately phosphorylate p53 to promote its stabilization. These phosphorylation events are important for p53 stabilization, as some of the modifications disrupt the interaction between p53 and its negative regulators MDM2 and MDM4. MDM2 and MDM4 bind to the transcriptional activation domains of p53, thereby inhibiting p53 transactivation function, and MDM2 has additional activity as an E3 ubiquitin ligase that causes proteasome-mediated degradation of p53. Phosphorylation also allows the interaction of p53 with transcriptional cofactors, which is ultimately important for activation of target genes and for responses such as cell cycle arrest, DNA repair, apoptosis and senescence. Non-receptor tyrosine kinase c-Abl can also be activated by DNA damage. Then the JNK/p38 is activated and leads to p53 activation[1][2]. 

 

Oncogenic signaling: The response to oncogene activation depends on the binding of ARF to MDM2. ARF is normally expressed at low levels in cells. Inappropriately increased E2F or Myc signals, stemming from oncogene activation, leads to the increased expression of ARF, which inhibits MDM2 by blocking its E3 ubiquitin ligase activity, uncoupling the p53-MDM2 interaction, thereby segregating it from nucleoplasmic p53[3].

 

The PI3K-Akt pathway activates MDM2 and increases the ubiquitination of p53. 

 

Reference:
[1]. Chène P, et al. Inhibiting the p53-MDM2 interaction: an important target for cancer therapy. Nat Rev Cancer. 2003 Feb;3(2):102-9.
[2]. Brown CJ, et al. Awakening guardian angels: drugging the p53 pathway. Nat Rev Cancer. 2009 Dec;9(12):862-73. 
[3]. Polager S, et al. p53 and E2f: partners in life and death. Nat Rev Cancer. 2009 Oct;9(10):738-48. doi: 10.1038/nrc2718.