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hook effect

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By Targets:	CD73 (1) Checkpoint Kinase (Chk) (1) IFNAR (1) Interleukin Related (1) Molecular Glues (1) PROTACs (2) STING (1) TNF Receptor (1)
By Research Areas:	Cancer (3) Inflammation/Immunology (3) Neurological Disease (1)

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Cat. No.	Product Name	Target	Research Areas	Chemical Structure

HY-161108

PROTAC Chk1 degrader-1	PROTACs Checkpoint Kinase (Chk)	Cancer
PROTAC Chk1 degrader-1 is a Chk1-targeting PROTAC.PROTAC Chk1 degrader-1 recruits the Cereblon E3 ligase to induce ubiquitination and proteasomal degradation of Chk1.PROTAC Chk1 degrader-1 exhibits Chk1 degradation activity in malignant melanoma cells without showing a hook effect.PROTAC Chk1 degrader-1 can be used for the research of malignant melanoma .

HY-162331

STING Degrader-1	Molecular Glues STING	Inflammation/Immunology Cancer
STING Degrader-1 (compound 2), a molecular glue, is a potent STING degrader that covalently binds to STING and E3 ligase. STING Degrader-1 exhibits a "hook effect", that degrades 75% STING protein at 10 μM, and degrades ca. 30% STING protein at 30 μM .

HY-P991634

IBI-325	CD73 TNF Receptor Interleukin Related IFNAR	Inflammation/Immunology Cancer
IBI-325 is a humanized monoclonal antibody inhibitor targeting CD73. IBI-325 completely inhibits CD73 enzymatic activity without hook effect. IBI-325 reverses Adenosine monophosphate (HY-A0181)-mediated immune suppression and significantly inhibits T cell proliferation and cytokines (IL-2, IFN-γ and TNF-α) release. IBI-325 has potent antitumor activities in hPBMC-reconstituted mice model and hCD73 knock-in mice model. IBI-325 can be used for cancer immunotherapy research .

HY-N3788

Dulcioic acid	Others	Inflammation/Immunology
Dulcioic acid (compound 19) is a product isolated from Tripterygium wilfordii Hook f. Dulcioic acid shows a significant inhibitory effect on cytokine production .

HY-180547

MRC71	PROTACs	Neurological Disease
MRC71 is a TRIMTAC degrader targeting Halo Tag, containing a PEG linker and chloroalkane. MRC71 selectively degrades oligomeric CAV1- and Cavin1-mEGFP-Halo over monomeric mEGFP-Halo and exhibits a characteristic hook effect concentration-dependence for degradation .

Cat. No.	Product Name	Target	Research Area	Image

HY-P991634

IBI-325	CD73 TNF Receptor Interleukin Related IFNAR	Inflammation/Immunology Cancer
IBI-325 is a humanized monoclonal antibody inhibitor targeting CD73. IBI-325 completely inhibits CD73 enzymatic activity without hook effect. IBI-325 reverses Adenosine monophosphate (HY-A0181)-mediated immune suppression and significantly inhibits T cell proliferation and cytokines (IL-2, IFN-γ and TNF-α) release. IBI-325 has potent antitumor activities in hPBMC-reconstituted mice model and hCD73 knock-in mice model. IBI-325 can be used for cancer immunotherapy research .

Dulcioic acid	Triterpenes Terpenoids Celastraceae Plants Tripterygium wilfordii Hook. f. Source Classification	Others
Dulcioic acid (compound 19) is a product isolated from Tripterygium wilfordii Hook f. Dulcioic acid shows a significant inhibitory effect on cytokine production .

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BODIPY 493/503 purchased from MedChemExpress. Usage Cited in: Nat Commun. 2025 Feb 1;16(1):1241. [Abstract]

MedchemExpress Validation 01

Western blot analysis of extracts from THP-1(lane 2(20μg), Jurkat (lane 3(20μg) and NIH3T3(lane 4(20μg) using FOXO1A (HY-P80132) Rabbit mAb. Proteins were transferred to a PVDF membrane and blocked with 5% non-fat milk in TBST for 2 hour at room temperature. The primary antibody (1/1000) and Loading control antibody (Beta Actin, HY-P80438, 1/10000) was used in 5% non-fat milk in TBST at 4°C overnight. Goat Anti-Mouse/Rabbit IgG-HRP Secondary Antibody (1/10000) was used for 1 hour at room temperature. Western blot analysis of extracts from THP-1(lane 2(20μg), Jurkat (lane 3(20μg) and NIH3T3(lane 4(20μg) using FOXO1A (HY-P80132) Rabbit mAb. Proteins were transferred to a PVDF membrane and blocked with 5% non-fat milk in TBST for 2 hour at room temperature. The primary antibody (1/1000) and Loading control antibody (Beta Actin, HY-P80438, 1/10000) was used in 5% non-fat milk in TBST at 4°C overnight. Goat Anti-Mouse/Rabbit IgG-HRP Secondary Antibody (1/10000) was used for 1 hour at room temperature. Western blot analysis of extracts from THP-1(lane 2(20μg), Jurkat (lane 3(20μg) and NIH3T3(lane 4(20μg) using FOXO1A (HY-P80132) Rabbit mAb. Proteins were transferred to a PVDF membrane and blocked with 5% non-fat milk in TBST for 2 hour at room temperature. The primary antibody (1/1000) and Loading control antibody (Beta Actin, HY-P80438, 1/10000) was used in 5% non-fat milk in TBST at 4°C overnight. Goat Anti-Mouse/Rabbit IgG-HRP Secondary Antibody (1/10000) was used for 1 hour at room temperature.

BODIPY 493/503 purchased from MedChemExpress. Usage Cited in: Nat Commun. 2025 Feb 1;16(1):1241. [Abstract]

MedchemExpress Validation 01

MedchemExpress Validation 03

Western blot analysis of extracts from THP-1(lane 2(20μg), Jurkat (lane 3(20μg) and NIH3T3(lane 4(20μg) using FOXO1A (HY-P80132) Rabbit mAb. Proteins were transferred

MedchemExpress Validation 04

MedchemExpress Validation

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hook effect

Inhibitors & Agonists

Inhibitory Antibodies

NaturalProducts

Natural
Products