tumor suppressor p53

p53 tumor suppressor fragment (232-240) is a peptide with the sequence H2N-Lys-Tyr-Met-Cys-Asn-Ser-Ser-Cys-Met-OH, MW= 1066.3. p53 is a tumor suppressor protein that in humans is encoded by the TP53 gene. p53 is crucial in multicellular organisms, where i

Pentamidine dimesylate is an inhibitor of calcium-dependent complex formation with p53 [(Ca)S100B-p53) in malignant melanoma (MM). Pentamidine dimesylate restores p53 tumor suppressor activity in vivo.

TLBC, a borane-chalcone derivative, exhibits dose-dependent inhibitory effects across various glioma cell lines with IC50 values ranging from 5.5 to 25.5 μM. TLBC induces apoptosis independently of alterations in the tumor suppressor factor p53.

SDU-071 is an orally active BRD4-p53 inhibitor, inhibiting the proliferation of MDA-MB-231 cells, blocking the interaction between BRD4 and the tumor suppressor p53, downregulating the expression of BRD4-targeted genes, thereby inhibiting cell proliferation, migration, and invasion, and inducing cell cycle arrest and apoptosis. SDU-071 is used for research on triple-negative breast cancer.

CB2 receptor agonist 8 (Compound 17) is an agonist of the cannabinoid receptor 2 (CB2 receptor). It shows cytotoxicity in U87, RPMI 8226, HL-60, and L929 cells with IC50 values of 91.03, 16.29, 23.51, and 564.6 μM, respectively. CB2 receptor agonist 8 activates caspase 3/7, increases the expression of pro-apoptotic genes BAX, BAD, BIM, and the tumor suppressor gene p53, and induces apoptosis in U87 cells. Additionally, it inhibits the migration of U87 cells.

p38α inhibitor6 (compound 19) is a p38α inhibitor with an IC50 value of 0.68 μM. It induces apoptosis, arrests the cell cycle in the G0 and G2/M phases, reduces TNF-α concentration, upregulates the expression of the tumor suppressor gene p53, increases the Bax/BCL-2 ratio, and activates caspase3/7.

Milademetan (DS-3032b or DS-3032) is a potent and selective MDM2 inhibitor with potential antineoplastic activity. Milademetan (p.o.) binds to and prevents the binding of MDM2 protein to the transcriptional activation domain of the tumor suppressor protei

FL118 inhibits human survivinion expression and activates tumor suppressor p53 as a MOA in p53 wild-type cancer cells.

Milademetan is a potent and selective MDM2 inhibitor. MDM2 inhibitor DS-3032b binds to and prevents the binding of MDM2 protein to the transcriptional activation domain of the tumor suppressor protein p53 upon oral administration. By preventing this MDM2-p53 interaction, the proteosome-mediated enzymatic degradation of p53 is inhibited and the transcriptional activity of p53 is restored. This results in the restoration of p53 signaling and leads to the p53-mediated induction of tumor cell apoptosis.

Kevetrin hydrochloride (4-Isothioureidobutyronitrile hydrochloride) is a small molecule and activator of the tumor suppressor protein p53, with potential antineoplastic activity.

Sirtuins (SIRTs) represent a distinct class of trichostatin A-insensitive lysyl-deacetylases (class III HDACs). Human SIRT1 is the homolog of yeast silent information regulator 2 (Sir2) and has been shown to regulate the activity of the p53 tumor suppressor and inhibit apoptosis. Small molecule activators of SIRT1, such as resveratrol, extend lifespan in yeast and C. elegans in a manner that resembles caloric restriction. CAY10591 has been identified as an activator of the enzyme SIRT1. This compound increases fluorescence by 233% in a SIRT1 activity assay. [Activator activity was defined as the percentage of signal increase relative to signal window in the following formula: 100 x (Sample - Signallow)/(Signalhigh - Signallow)]. CAY10591 suppresses TNF-α in a dose-dependent manner. In THP-1 cells, TNF-α levels decreased from 325 pg/ml (control) to 104 and 53 pg/ml with 20 and 60 µM CAY10591, respectively. This activator also has a significant dose-dependent effect on fat mobilization in differentiated adipocytes, which would indicate the potential of SIRT1 activators for anti-obesity or anti-diabetic purposes.

Inactivation of the tumor suppressor p53 commonly coincides with increased signaling through NF-κB in cancer. CAY10681 is a dual modulator of p53-MDM2 interaction and NF-κB signaling. It potently binds MDM2 (Ki = 250 nM), reducing MDM2-mediated turnover of p53. CAY10681 also inhibits phosphorylation of IκBα and dose-dependently reduces nuclear accumulation of p65. It blocks the proliferation of cancer cell lines (IC50s range from 33 to 37 μM). CAY10681 exhibits excellent oral bioavailability and inhibits tumor growth in A549 xenografts in nude mice.

9(Z),11(E),13(E)-Octadecatrienoic Acid ethyl ester (α-ESA) is a conjugated polyunsaturated fatty acid commonly found in plant seed oil. This fatty acid accounts for about 60% of the total fatty acid composition of bitter gourd seed oil and about 70% in tung oil. α-ESA is metabolized and converted to conjugated linoleic acid (9Z,11E-CLA) in rats. It has shown potential as a tumor growth suppressor. In colon cancer Caco-2 cells, α-ESA induced apoptosis through up-regulation of GADD45, p53, and PPARγ. In DLD-1 cells supplemented with α-ESA, apoptosis was induced via lipid peroxidation with an EC50 of 20 μM. It also inhibits DNA polymerases and topoisomerases with IC50s ranging from ~5-20 μM for different isoforms of the enzymes. α-ESA ethyl ester is a neutral, more lipid soluble form of the free acid.

Methyl alpha-eleostearate (α-ESA) is a conjugated polyunsaturated fatty acid commonly found in plant seed oil. This fatty acid accounts for about 60% of the total fatty acid composition of bitter gourd seed oil and about 70% in tung oil. α-ESA is metabolized and converted to conjugated linoleic acid (9Z,11E-CLA) in rats. It has shown potential as a tumor growth suppressor. In colon cancer Caco-2 cells, α-ESA induced apoptosis through up-regulation of GADD45, p53, and PPARγ. In DLD-1 cells supplemented with α-ESA, apoptosis was induced via lipid peroxidation with an EC50 of 20 μM. It also inhibits DNA polymerases and topoisomerases with IC50s ranging from ~5-20 μM for different isoforms of the enzymes. α-ESA methyl ester is a neutral, more lipid soluble form of the free acid.

The protein p53, often called the 'guardian of the genome,' is a transcription factor that is activated in response to cellular stress (low oxygen levels, heat shock, DNA damage, etc.) and acts to prevent further proliferation of the stressed cell by promoting cell cycle arrest or apoptosis. Its role as a tumor suppressor is evident by the observation that approximately 50% of human tumors have mutated or non-functional p53. PK7242 is an inducer of reactivation of mutant p53 in cancer cells. In cancer cells carrying the Y220C mutant, PK7242 binds to the p53-Y220C core domain and induces growth inhibition, cell-cycle arrest, and apoptosis.

MMRi62 (7-[(2,3-dichlorophenyl)-(pyridin-2-ylamino)methyl]quinolin-8-ol), a ferroptosis inducer targeting MDM2-MDM4 (negative regulators of tumor suppressor p53). MMRi62 shows a P53-independent pro-apoptotic activity against pancreatic ductal adenocarcinoma (PDAC) cells and induce autophagy. MMRi62 inducesferroptosis, resulting in a increase of reactive oxygen and lysosomal degradation of ferritin heavy chain (FTH1). MMRi62 also leads to proteasomal degradation of mutant p53, also inhibits orthotopic xenograft PDAC mouse model in vivo with high frequency mutation characteristics of KRAS and TP53.12.

MDM2-IN-26 (compound A3) is an inhibitor of MDM2 that facilitates the activation of p53's tumor suppressor functions by inhibiting the MDM2-p53 interaction, with MDM2 being the primary negative regulator of p53. This compound is utilized in cancer research [1].