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| Gambogic acid is a naturally occurring xanthonoid extracted from the resin of trees belonging to the Garcinia genus—most notably, Garcinia hanburyi. This tree is native to regions in Southeast Asia, particularly found in areas of China, India, and neighboring countries. Gambogic acid (GA; C38H44O8, MW: 628.76), a polyprenylated xanthone and a widely used coloring agent, is the main active ingredient of gamboges secreted from the Garcinia hanburyi tree ([3, 4], which mainly grows in Southeast Asia. GA has been approved by the Chinese FDA for the treatment of solid cancers in Phase II clinical trials. Pathways: -evidence suggesting that it can inhibit thioredoxin reductase (TrxR). -can indeed lead to an increase in reactive oxygen species (ROS) levels -Gambogic acid can trigger mitochondrial dysfunction, leading to cytochrome c release -influences death receptors -Inhibition of NF-κB Signaling -Inhibition of VEGF Pathway -Cell Cycle Arrest: -p53 Activation Gambogic acid — a naturally occurring, highly prenylated caged xanthone isolated principally from gamboge resin produced by Garcinia hanburyi. It is an experimental small-molecule anticancer agent commonly abbreviated GA or GBA, with the molecular formula C38H44O8. GA is an electrophilic, multi-target compound whose α,β-unsaturated carbonyl groups can covalently modify reactive cysteine residues in redox-regulatory and proteostasis proteins. It has undergone limited Phase I and Phase IIa clinical investigation in China as an intravenous formulation but is not an established or broadly approved anticancer drug. Primary mechanisms (ranked):
Bioavailability / PK relevance: GA is highly lipophilic, poorly water-soluble, chemically reactive, and rapidly distributed and metabolized. Human studies have used intravenous GA formulations rather than conventional oral dosing. A major circulating human metabolite is 10-hydroxygambogic acid. Short systemic persistence, formulation-dependent exposure, local irritation, and limited aqueous solubility have driven extensive investigation of liposomes, albumin carriers, polymeric nanoparticles, solid-lipid nanoparticles, and other targeted delivery systems. Preclinical toxicology identifies the liver and kidney as principal dose-limiting target organs, with potential drug-interaction concerns related to CYP3A4 and transporter modulation. In-vitro vs systemic exposure relevance: Many mechanistic studies use approximately micromolar GA concentrations and short, direct cellular exposure. These conditions may produce greater free-drug exposure than is safely sustained in plasma or tissues because GA is poorly soluble, extensively protein-bound, rapidly metabolized, and systemically toxic at higher exposure. Covalent target engagement may permit biological activity despite transient exposure, but concentration-dependent cell-culture findings should not be assumed to translate directly to achievable unencapsulated systemic dosing. Clinical evidence status: Predominantly preclinical, with limited small-human evidence. An open-label, randomized, multicentre Phase IIa study evaluated different intravenous dosing schedules in patients with advanced solid malignancies and reported mainly grade 1–2 adverse effects, but the study was small, lacked a placebo or standard-treatment control, and did not establish definitive efficacy. There is no robust confirmatory randomized trial evidence, no established survival benefit, and no routine clinical role. GA should therefore be classified as an investigational natural-product-derived anticancer agent rather than an approved chemotherapy. Gambogic Acid Mechanistic Ranking
P: 0–30 min R: 30 min–3 hr G: >3 hr older table (left here for references)
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| Also known as CP32. Cysteinyl aspartate specific proteinase-3 (Caspase-3) is a common key protein in the apoptosis and pyroptosis pathways, and when activated, the expression level of tumor suppressor gene Gasdermin E (GSDME) determines the mechanism of tumor cell death. As a key protein of apoptosis, caspase-3 can also cleave GSDME and induce pyroptosis. Loss of caspase activity is an important cause of tumor progression. Many anticancer strategies rely on the promotion of apoptosis in cancer cells as a means to shrink tumors. Crucial for apoptotic function are executioner caspases, most notably caspase-3, that proteolyze a variety of proteins, inducing cell death. Paradoxically, overexpression of procaspase-3 (PC-3), the low-activity zymogen precursor to caspase-3, has been reported in a variety of cancer types. Until recently, this counterintuitive overexpression of a pro-apoptotic protein in cancer has been puzzling. Recent studies suggest subapoptotic caspase-3 activity may promote oncogenic transformation, a possible explanation for the enigmatic overexpression of PC-3. Herein, the overexpression of PC-3 in cancer and its mechanistic basis is reviewed; collectively, the data suggest the potential for exploitation of PC-3 overexpression with PC-3 activators as a targeted anticancer strategy. Caspase 3 is the main effector caspase and has a key role in apoptosis. In many types of cancer, including breast, lung, and colon cancer, caspase-3 expression is reduced or absent. On the other hand, some studies have shown that high levels of caspase-3 expression can be associated with a better prognosis in certain types of cancer, such as breast cancer. This suggests that caspase-3 may play a role in the elimination of cancer cells, and that therapies aimed at activating caspase-3 may be effective in treating certain types of cancer. Procaspase-3 is a apoptotic marker protein. Prognostic significance: • High Cas3 expression: Associated with good prognosis and increased sensitivity to chemotherapy in breast, gastric, lung, and pancreatic cancers. • Low Cas3 expression: Linked to poor prognosis and increased risk of recurrence in colorectal, hepatocellular carcinoma, ovarian, and prostate cancers. |
| 5148- | GamB, | Gambogic acid: A shining natural compound to nanomedicine for cancer therapeutics |
| - | Review, | Var, | NA |
| 5149- | GamB, | Gambogic acid induces mitochondria-dependent apoptosis by modulation of Bcl-2 and Bax in mantle cell lymphoma JeKo-1 cells |
| - | in-vitro, | lymphoma, | JeKo-1 |
| 5151- | GamB, | Gambogic acid affects ESCC progression through regulation of PI3K/AKT/mTOR signal pathway |
| - | in-vitro, | ESCC, | KYSE-30 | - | in-vitro, | ESCC, | KYSE450 |
| 5152- | GamB, | Gambogic Acid as a Candidate for Cancer Therapy: A Review |
| - | Review, | Var, | NA |
| 7059- | GamB, | Gambogic acid inhibits growth, induces apoptosis, and overcomes drug resistance in human colorectal cancer cells |
| - | in-vitro, | CRC, | HCT15 |
| 7060- | GamB, | New targets for the antitumor activity of gambogic acid in hematologic malignancies |
| - | Review, | Melanoma, | RPMI-8226 |
| 7065- | GamB, | Gambogic acid: A review of its pharmacological mechanisms against cancer |
| - | Review, | Var, | NA |
| 7067- | GamB, | Gambogic Acid and Its Role in Chronic Diseases |
| - | Review, | Var, | NA |
| 1959- | GamB, | Gambogic acid induces GSDME dependent pyroptotic signaling pathway via ROS/P53/Mitochondria/Caspase-3 in ovarian cancer cells |
| - | in-vitro, | Ovarian, | NA | - | in-vivo, | NA, | NA |
| 1961- | GamB, | Effects of gambogic acid on the activation of caspase-3 and downregulation of SIRT1 in RPMI-8226 multiple myeloma cells via the accumulation of ROS |
| - | in-vitro, | Melanoma, | RPMI-8226 |
| 1967- | GamB, | Gambogic acid induces apoptotic cell death in T98G glioma cells |
| - | in-vitro, | GBM, | T98G |
Query results interpretion may depend on "conditions" listed in the research papers. Such Conditions may include : -low or high Dose -format for product, such as nano of lipid formations -different cell line effects -synergies with other products -if effect was for normal or cancerous cells
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