H-89 dihydrochloride (5-Isoquinolinesulfonamide) is a selective inhibitor of cAMP-dependent protein kinase A (PKA) with an IC₅₀ value of 48 nM. It also mildly inhibits PKG, PKC, and casein kinase activity. H-89 dihydrochloride can be used in research areas such as cell proliferation, apoptosis, metabolism, neurotransmission, and endocrine regulation.

PKA:48 nM (Ki, cell free), S6K1:80 nM (cell free)

Methods: HCT116 cells were treated with H-89 dihydrochloride at concentrations ranging from 1.56 to 50 μM for 72 hours. The MTT colorimetric assay was used to evaluate the effect of H-89 dihydrochloride on cell viability.
Results: H-89 dihydrochloride exhibited concentration-dependent growth inhibition in HCT116 cells. [1]
Methods: In LS174T cells, the TCF/LEF luciferase reporter plasmid was added. After transfection, cells were treated with 20 μM H-89 dihydrochloride for 1 hour. Subsequently, cells were stimulated with PGE2 (concentrations 1–10 μM) and cultured for an additional 6 hours. The TCF/LEF luciferase reporter assay was employed to evaluate the effect of H-89 dihydrochloride on Wnt/β-catenin signaling pathway transcriptional activity.
Results: In LS174T cells, 20 μM H-89 dihydrochloride treatment effectively blocked PGE2-stimulated TCF/LEF transcriptional activity. [2]

Methods: Adult SD rats were used to establish a fever model via intraperitoneal injection of lipopolysaccharide (LPS, 80 μg/kg). Thirty minutes prior to LPS injection, H-89 dihydrochloride (0.5, 1.0, 1.5 μg/site) was administered via lateral ventricle catheter implantation to inhibit central PKA activity. Rats were euthanized and tissues collected 4.5 hours after LPS injection.
Results: H-89 dihydrochloride treatment significantly suppressed p-TRPV1 levels while minimally affecting total TRPV1. Administration alone had no significant effect on basal body temperature in normal rats. [3]

All protein kinase activities were linear with respect to time in every incubation. Assays were performed either manually for 10 min at 30 °C in 50 μl incubations using [γ-32P]ATP or with a Biomek 2000 Laboratory Automation Workstation in a 96-well format for 40 min at ambient temperature in 25 μl incubations using [γ-33P]ATP. The concentrations of ATP and magnesium acetate were 0.1 mM and 10 mM respectively unless stated otherwise. This concentration of ATP is 5–10-fold higher than the Km for ATP of most of the protein kinases studied in the present paper, but lower than the normal intracellular concentration, which is in the millimolar range. All assays were initiated with MgATP. Manual assays were terminated by spotting aliquots of each incubation on to phosphocellulose paper, followed by immersion in 50 mM phosphoric acid. Robotic assays were terminated by the addition of 5 μl of 0.5 M phosphoric acid before spotting aliquots on to P30 filter mats. All papers were then washed four times in 50 mM phosphoric acid to remove ATP, once in acetone (manual incubations) or methanol (robotic incubations), and then dried and counted for radioactivity [2].

After 48 h in culture, PCl2D cells are cultured in a test medium containing 30 μM H-89 for 1 h and then exposed to a fresh medium that contained both 10 μM forskolin and 30 μM H-89. Cells are scraped off with a rubber policeman and sonicated in the presence of 0.5 mL of 6% trichloroacetic acid. To extract trichloroacetic acid, 2 mL of petroleum ether is added, the preparation mixed and centrifuged at 3000 rpm for 10 min. After aspiration of the upper layer, the residue sample solution is used for determination [1].

H89 (N-[2-(p-Bromocinnamylamino)ethyl]-5-isoquinolinesulfonamide], di-HCl Salt) (10 mg/kg) suspended in 5% DMSO in saline was administered i.p. two hours before each OVA challenge (or two hours before the last OVA challenge). Control animals received equivalent volumes (200 μl) of 5% DMSO in saline [5].

H2O: < 1 mg/mL (insoluble or slightly soluble)

DMSO: 104 mg/mL (200.28 mM), Sonication is recommended.

5% DMSO+95% Saline: 3.16 mg/mL (6.09 mM), Solution.