2. Signaling Pathways
  3. Apoptosis
  4. Caspase

Caspase

Caspase

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Caspase is a family of cysteine proteases that play essential roles in apoptosis (programmed cell death), necrosis, and inflammation. There are two types of apoptotic caspases: initiator (apical) caspases and effector (executioner) caspases. Initiator caspases (e.g., CASP2, CASP8, CASP9, and CASP10) cleave inactive pro-forms of effector caspases, thereby activating them. Effector caspases (e.g., CASP3, CASP6, CASP7) in turn cleave other protein substrates within the cell, to trigger the apoptotic process. The initiation of this cascade reaction is regulated by caspase inhibitors. CASP4 and CASP5, which are overexpressed in some cases of vitiligo and associated autoimmune diseases caused by NALP1 variants, are not currently classified as initiator or effector in MeSH, because they are inflammatory enzymes that, in concert with CASP1, are involved in T-cell maturation.

Caspase Isoform Specific Products:

Caspase Isoform Comparison
Cat. No. Product Name Effect Purity Chemical Structure
  • HY-137225
    HTS07944
    		Agonist
    HTS07944 (HTS07944SC, C3) is a potent modulator of laminin receptor (37 LR). HTS07944 (HTS07944SC, C3) possesses anti-cancer activity in PC-3 cells and activates Caspase 3/7.
    HTS07944
  • HY-N1939R
    Icariside I (Standard)
    Icariside I (Standard) is the analytical standard of Icariside I (HY-N1939). This product is intended for research and analytical applications. Icariside I (GH01) is an orally active metabolite of icalin. Icariside I improves estrogen deficiency-induced osteoporosis by simultaneously regulating osteoblast and osteoclast differentiation. Icariside I promotes ATP (HY-B2176) or Nigericin (HY-127019)-induced mtROS production and NLRP3 inflammasome activation and causes idiosyncratic hepatotoxicity. Icariside I does not alter the activation of NLRC4 and AIM2 inflammasomes. Icariside I inhibits breast cancer proliferation, apoptosis, invasion, and metastasis by targeting the IL-6/STAT3 pathway. Icariside I is a kynurenine-AhR pathway inhibitor that alleviates cancer by blocking tumor immune escape.
    Icariside I (Standard)
  • HY-127149
    Mofarotene
    		Activator
    Mofarotene (Ro 40-8757), an arotinoid, is anticancer compound. Mofarotene induces apoptosis, associated with mitochondrial membrane depolarization, activation of caspase-3 and -9, and enhanced production of reactive oxygen species. Mofarotene inhibits hematopoiesis in vitro by inhibiting maturation from primitive progenitor cells.
    Mofarotene
  • HY-169922
    HDAC-IN-82
    		Activator
    HDAC-IN-82 (Compound 18b) is a histone deacetylase (HDAC) inhibitor with selective antiplasmodial and anticancer activity. HDAC-IN-82 shows potent antiproliferative activity and caspase 3/7 activation in cancer cells. HDAC-IN-82 causes hyperacetylation of histone H3 and α-tubulin.
    HDAC-IN-82
  • HY-19696BR
    Tauroursodeoxycholate dihydrate (Standard)
    		Inhibitor
    Tauroursodeoxycholate (dihydrate) (Standard) is the analytical standard of Tauroursodeoxycholate (dihydrate). This product is intended for research and analytical applications. Tauroursodeoxycholate (Tauroursodeoxycholic acid; TDUCA) dihydrate is an endoplasmic reticulum (ER) stress inhibitor. Tauroursodeoxycholate significantly reduces expression of apoptosis molecules, such as caspase-3 and caspase-12. Tauroursodeoxycholate also inhibits ERK.
    Tauroursodeoxycholate dihydrate (Standard)
  • HY-116664
    DPQZ
    DPQZ is an anti-tubulin agent that inhibits cell separation and induces cell cycle arrest at the G2/M phase. In addition, DPQZ induces caspase-dependent apoptosis of HSC-3 cells by inhibiting Ras/Raf and activating MAP kinase. DPQZ can be used in the study of oral cancer.
    DPQZ
  • HY-116572
    TASIN-1 hydrochloride
    		Activator
    TASIN-1 hydrochloride is a selective inhibitor of truncated APCTR (adenomatous polyposis coli gene) that exerts cytotoxic effects by inhibiting cholesterol biosynthesis. TASIN-1 hydrochloride specifically targets colorectal cancer (CRC) cells carrying APC truncated mutations, while having no significant toxicity to wild-type APC cells. TASIN-1 hydrochloride exerts cytotoxic effects by targeting Emopamil binding protein (EBP) to inhibit cholesterol biosynthesis, triggering endoplasmic reticulum (ER) stress, reactive oxygen species (ROS) generation, and JNK-mediated apoptosis, and inhibiting Akt survival signaling. TASIN-1 hydrochloride can be used to prevent and intervene in APC mutant colorectal cancer.
    TASIN-1 hydrochloride
  • HY-N3126R
    Orsellinic acid (Standard)
    		Inhibitor
    Orsellinic acid (Standard) is an analytical standard of Orsellinic acid (HY-N3126). This product is intended for research and analytical applications. Orsellinic acid is a Benzoic acid (HY-N0216) derivative. Orsellinic acid can be isolated from Chaetomium globosum endophytic on Ephedra fasciculata (Mormon tea). Orsellinic acid blocks PAF-mediated Apoptosis, inhibits caspase-3/7 activation, and PARP cleavage. Orsellinic acid can be used in research of neurons and various tumors (non-small cell lung cancer, breast cancer, neuroblastoma, pancreatic cancer).
    Orsellinic acid (Standard)
  • HY-119459R
    Fluopyram (Standard)
    		Activator
    Fluopyram (Standard) is the analytical standard of Fluopyram (HY-119459). This product is intended for research and analytical applications. Fluopyram is an orally active succinate dehydrogenase inhibitor, antifungal and nematicide. Fluopyram inhibits succinate dehydrogenase activity, activates CAR/PXR nuclear receptors, and increases caspase-3, TNF-α and NF-κB. Fluopyram inhibits the growth of F. virguliforme, Botrytis cinerea and Alternaria solani with EC50 values of 3.35, 5.389 and 0.244 µg/mL, respectively. Fluopyram induces liver and thyroid tumor formation. Fluopyram is nephrotoxic and embryotoxic.
    Fluopyram (Standard)
  • HY-B0464R
    Hydralazine hydrochloride (Standard)
    Hydralazine (hydrochloride) (Standard) is the analytical standard of Hydralazine (hydrochloride). This product is intended for research and analytical applications. Hydralazine hydrochloride is an antihypertensive agent. Hydralazine hydrochloride can inhibit mitochondrial fission and human peritoneal mesothelial cell proliferation. Hydralazine hydrochloride has immunomodulation and anti-migratory effect. Hydralazine hydrochloride activates the intrinsic pathway of apoptosis and causes DNA damage.
    Hydralazine hydrochloride (Standard)
  • HY-119807
    Prosultiamine
    Prosultiamine is an allithiamine homolog. Prosultiamine can disrupt intracellular redox reactions, inducing caspase-dependent apoptosis in HTLV-1 infected cells. Prosultiamine can be used in studies involving lower urinary tract dysfunction associated with human T-lymphotropic virus type 1-related myelopathy/tropical spastic paraparesis.
    Prosultiamine
  • HY-13610AR
    N1,N11-Diethylnorspermine tetrahydrochloride (Standard)
    		Activator
    N1,N11-Diethylnorspermine (tetrahydrochloride) (Standard) is the analytical standard of N1,N11-Diethylnorspermine (tetrahydrochloride). This product is intended for research and analytical applications. N1, N11-Diethylnorspermine tetrahydrochloride (DENSPM tetrahydrochloride) is a potent anticancer agent. N1,N11-Diethylnorspermine tetrahydrochloride activates polyamine catabolism and downregulates mTOR protein. N1,N11-Diethylnorspermine tetrahydrochloride induces the release of cytochrome c from mitochondria, resulting in activation of caspase 3. N1,N11-Diethylnorspermine tetrahydrochloride kills glioblastoma multiforme (GBM) through induction of SSAT (spermidine/spermine N1-acetyltransferase) coupled with H2O2 production.
    N1,N11-Diethylnorspermine tetrahydrochloride (Standard)
  • HY-119420
    Acetoxycycloheximide
    		Activator
    Acetoxycycloheximide is an antibiotic with antitumor activity. Acetoxycycloheximide a protein synthesis inhibitor. Acetoxycycloheximide significantly induces activation of procaspase-3 and subsequent apoptosis mediated by the Cytochrome c from mitochondria via activation of JNK pathway. Acetoxycycloheximide triggers the downregulation of cell surface TNF-R1 via the activation of ERK and p38 MAPK, thereby preventing activation of the NF-κB signaling pathway by TNF-α. Acetoxycycloheximide is much more toxic to female rats than to males. Acetoxycycloheximide can be used for inflammatory and immune diseases and cancers research.
    Acetoxycycloheximide
  • HY-Y0396R
    N-Hydroxyphthalimide (Standard)
    		Activator
    N-Hydroxyphthalimide (Standard) is the analytical standard of N-Hydroxyphthalimide (HY-Y0396). This product is intended for research and analytical applications. N-Hydroxyphthalimide is a blocking agent and catalyst. N-Hydroxyphthalimide promotes oxidation reactions by generating PINO free radicals and activating hydrogen atom transfer processes. N-Hydroxyphthalimide reduces the expression of anti-apoptotic proteins Survivin and Bcl-xL and activates caspase 9 and caspase 3. N-Hydroxyphthalimide induces Apoptosis. N-Hydroxyphthalimide inhibits the phosphorylation of mTOR (Ser2448, Ser2481) and Akt (Ser473). N-Hydroxyphthalimide has anticancer effects against breast and colon cancer.
    N-Hydroxyphthalimide (Standard)
  • HY-B1971S1
    Deltamethrin-d6
    Deltamethrin-d6 (Decamethrin-d6) is deuterium labeled Deltamethrin. Deltamethrin (Decamethrin) is an orally active synthetic pyrethroid insecticide. Deltamethrin induces oxidative stress and results in inflammation and apoptosis via inhibiting Nrf2/HO-1 pathway. Deltamethrin has an anticancer effect by inducing apoptosis. Deltamethrin can be used extensively in pest control.
    Deltamethrin-d<sub>6</sub>
  • HY-N15378
    β-Carotene-15,15'-epoxide
    		Inhibitor
    β-carotene-15,15ʹ-epoxide is a XIAP antagonist with apoptosis-inducing and antitumor activity, found in the leaves of Spondias mombin. In a DMBA (HY-W011845)-induced rat model of breast cancer, β-carotene-15,15ʹ-epoxide binds to the BIR3 domain of the anti-apoptotic protein XIAP, blocking its interaction with caspase-9 and thereby promoting tumor cell apoptosis. In addition, β-carotene-15,15ʹ-epoxide significantly downregulates the expression of BCL-2, COX-2, and TNF-α in tumor tissues, reduces MDA levels, increases catalase activity, and modulates serum levels of LDH, ALP, and ALT, demonstrating strong antioxidant, anti-inflammatory, and metabolic protective effects. β-carotene-15,15ʹ-epoxide may be used in research on inflammation-related conditions and cancers such as breast cancer.
    β-Carotene-15,15'-epoxide
  • HY-B1193S
    Terfenadine-d3
    Terfenadine-d3 ((±)-Terfenadine-d3) is the deuterium labeled Terfenadine. Terfenadine ((±)-Terfenadine) is a potent open-channel blocker of hERG with an IC50 of 204 nM. Terfenadine, an H1 histamine receptor antagonist, acts as a potent apoptosis inducer in melanoma cells through modulation of Ca2+ homeostasis. Terfenadine induces ROS-dependent apoptosis, simultaneously activates Caspase-4, -2, -9[2].
    Terfenadine-d3
  • HY-N6979R
    Crustecdysone (Standard)
    		Inhibitor
    Crustecdysone (Standard) is the analytical standard of Crustecdysone. This product is intended for research and analytical applications. Crustecdysone (20-Hydroxyecdysone) is a naturally occurring ecdysteroid hormone isolated from Serratula coronata which controls the ecdysis (moulting) and metamorphosis of arthropods, it inhibits caspase activity and induces autophagy via the 20E nuclear receptor complex, EcR-USP. Crustecdysone exhibits regulatory or protective roles in the cardiovascular system. Crustecdysone is an active metabolite of Ecdysone (HY-N0179).
    Crustecdysone (Standard)
  • HY-N8508
    Myrothecine A
    		Activator
    Myrothecine A is a trichothecene mycotoxin found in M. roridum. Myrothecine A induces apoptosis, promotes the cytochrome c release, PARP-cleavage and phosphorylation of JNK, increases Bax and cleaved caspase-3, -5, and -8 levels. Myrothecine A has anticancer activities and promotes the maturation of DC cells in the microenvironment. Myrothecine A inhibits proliferation of A549, MCF-7, HepG2, and SMMC-7721 cancer cells with IC50s of 95, 70, 60, and 25 µM, respectively.
    Myrothecine A
  • HY-165537
    Siphonaxanthin
    		Activator
    Siphonaxanthin is a keto-carotenoid with anti-angiogenic and anti-inflammatory activity, which is found in green algae. Siphonaxanthin upregulates the expression of death receptor 5 (DR5), induces cancer cell apoptosis, decreases the expression of Bcl-2, and activates caspase-3. Siphonaxanthin is also an inhibitor of FGFR-1. Siphonaxanthin inhibits the proliferation, migration, and tube formation of human umbilical vein endothelial cells (HUVECs), as well as the outgrowth of microvessels in the rat aortic ring. Siphonaxanthin is promising for research of diseases such as cancer, diabetic retinopathy, and rheumatoid arthritis.
    Siphonaxanthin
Cat. No. Product Name / Synonyms Species Source
Cat. No. Product Name / Synonyms Application Reactivity
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Download Caspase Signaling Pathway Map.

Upon binding to their cognate ligand, death receptors such as Fas and TRAILR can activate initiator Caspases (Pro-caspase 8 and Pro-caspase 10) through dimerization mediated by adaptor proteins such as FADD and TRADD. Active Caspase 8 and Caspase 10 then cleave and activate the effector Caspase 3, 6 and 7, leading to apoptosis. ROS/DNA damage and ER stress trigger Caspase 2 activation. Active Caspase 2 cleaves and activates Caspase 3 and initiates apoptosis directly. Caspase 2, 8 and 10 can also cleave Bid, stimulate mitochondrial outer membrane permeabilization (MOMP) and initiate the intrinsic apoptotic pathway. Following MOMP, mitochondrial intermembrane space proteins such as Smac and Cytochrome C are released into the cytosol. Cytochrome C interacts with Apaf-1, triggering apoptosome assembly, which activates Caspase 9. Active Caspase 9, in turn, activates Caspase 3, 6 and 7, leading to apoptosis. Mitochondrial release of Smac facilitates apoptosis by blocking the inhibitor of apoptosis (IAP) proteins. 

 

Following the binding of TNF to TNFR1, TNFR1 binds to TRADD, which recruits RIPK1, TRAF2/5 and cIAP1/2 to form TNFR1 signaling complex I. Formation of the complex IIa and complex IIb is initiated either by RIPK1 deubiquitylation mediated by CYLD or by RIPK1 non-ubiquitylation due to depletion of cIAPs. The Pro-caspase 8 homodimer in complex IIa and complex IIb generates active Caspase 8. This active Caspase 8 in the cytosol then carries out cleavage reactions to activate downstream executioner caspases and thus induce classical apoptosis[1][2]. 

 

Reference:

[1]. Thomas C, et al. Caspases in retinal ganglion cell death and axon regeneration. Cell Death Discovery volume 3, Article number: 17032 (2017).
[2]. Brenner D, et al. Regulation of tumour necrosis factor signalling: live or let die. Nat Rev Immunol. 2015 Jun;15(6):362-74.

Caspase Isoform Comparison

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