Indole Alkaloids

Staurosporine is a potent, ATP-competitive and non-selective inhibitor of protein kinases with IC₅₀s of 6 nM, 15 nM, 2 nM, and 3 nM for PKC, PKA, c-Fgr, and Phosphorylase kinase respectively. Staurosporine also inhibits TAOK2 with an IC₅₀ of 3 μM. Staurosporine is an apoptosis inducer.

Caerulein is a decapeptide and a potent cholecystokinin receptor agonist. Caerulein is a safe and effective cholecystokinetic agent with a direct spasmogenic effect on the gallbladder muscle and bile ducts.

Serotonin (5-Hydroxytryptamine) hydrochloride is a monoamine neurotransmitter in the CNS and an endogenous 5-HT receptor agonist, with blood-brain barrier permeability. Serotonin hydrochloride is also a catechol O-methyltransferase (COMT) inhibitor with a K_i of 44 μM.

Serotonin is a monoamine neurotransmitter in the CNS and an endogenous 5-HT receptor agonist. Serotonin is also a catechol O-methyltransferase (COMT) inhibitor with a K_i of 44 μM.

Indole-3-pyruvic acid, a keto analogue of tryptophan, is an orally active AHR agonist. Indole-3-pyruvic acid has antioxidant properties, and can be used in the research of inflammation, anxiety.

Vinburnine ((-)-Eburnamonine; (-)-Vincamone) is an orally active, blood-brain barrier permeable immunomodulator and apoptosis inducer. Vinburnine drives the secretion of IL-24 by activating the P38/MAPK/ATF3 signaling axis. Vinburnine induces reactive oxygen species production and DNA damage in cancer cells, thereby inhibiting cancer cell proliferation, activating the apoptotic cascade, and enhancing CD8+ T cell function to remodel the tumor immune microenvironment. Vinburnine can be used in the research of diseases such as melanoma.

Norpsilocin (4-hydroxy-N-methyltrypt amine; 4-HO-NMT) is a natural tryptamine alkaloid isolated from the hallucinogenic mushroom Psilocybe cubensis. Norpsilocin activates human 5-HT2 receptors (5-HT2A: EC₅₀ = 8.4 nM; 5-HT2B = 12.8 nM; 5-HT2C = 39.6 nM) and displays binding affinity toward 5-HT1 receptors (5-HT1B: K_i = 212 nM; 5-HT1D = 48.9 nM; 5-HT1E = 81.7 nM). Norpsilocin induces β-arrestin recruitment at the 5-HT1B receptor. Norpsilocin fails to produce psychedelic-like effects in mice, whereas high doses can induce hypothermia in vivo. Norpsilocin acts as an important research tool for exploring the structure–activity relationship of tryptamine hallucinogens and the pharmacology of serotonin receptors.

Paspalicine is an indole diterpenoid fungal metabolite with no tremorgenic activity in animals. Paspalicine targets the large-conductance calcium-activated potassium (maxi-K) channel, blocks channel activity, and modulates the binding of Charybdotoxin (HY-P0191) to the maxi-K channel via a positive allosteric mechanism that enhances toxin binding. Paspalicine can be used in studies related to ryegrass staggers.

Harmine is a natural dual-specificity tyrosine phosphorylation-regulated kinase (DYRK) inhibitor with anticancer and anti-inflammatory activities. Harmine has a high affinity of 5-HT_2A serotonin receptor, with an K_i of 397 nM.

Yohimbine hydrochloride is an alpha-2 renal adenomatase receptor inhibitor, blocking pre- and post-contact alpha-2 renal adenomatase receptors, causing the release of renal adenoma and multiple sclerosis.

Reserpine is an inhibitor of the vesicular monoamine transporter 2 (VMAT2).

Indole-3-carboxaldehyde (3-Formylindole), a banlangen extract, is the product of the oxidative degradation of indole-3-acetic acid (IAA) by crude enzyme preparations from etiolated pea seedlings. Indole-3-carboxaldehyde is a biochemical used to prepare analogs of the indole phytoalexin cyclobrassinin. Indole-3-carboxaldehyde also enhances the epithelial barrier and anti-inflammatory activity in the intestinal tract.

Indole-3-carbinol (I3C) inhibits NF-κB activity and also is an Aryl hydrocarbon receptor (AhR) agonist, and an inhibitor of WWP1 (WW domain-containing ubiquitin E3 ligase 1).

Coumarin 6, a fluorescent dye, is used as a fluorescent probe in a microparticle drug delivery system to conduct in vivo tracking, cell uptake, and transport mechanism studies of drug delivery systems (λ_exc=450 nm, λ_em=505 nm).

Indole is an aromatic, heterocyclic, organic compound which widely distributed in the natural environment and can be produced by a variety of bacteria. Indole regulates various aspects of bacterial physiology, including spore formation, plasmid stability, resistance to drugs, biofilm formation, and virulence as an intercellular signal molecule.

Cyclopiazonic acid is an endoplasmic reticulum calcium ATPase (ECAs) inhibitor and human respiratory syncytial virus (RSV) inhibitor (EC₅₀ value of 4.13 μ M), which can reduce the antagonistic effect of 5-HT receptors in rat thoracic aorta, induce p53 dependent cell apoptosis and reproductive toxicity in mouse testes, and inhibit the biological activation of aflatoxin B^[1][4][5].

Evodiamine is an alkaloid isolated from the fruit of Evodia rutaecarpa Bentham with diverse biological activities including anti-inflammatory, anti-obesity, and antitumor.

Indirubin (Couroupitine B) is a bis-indole alkaloid and has emarkable anticancer activity against chronic myelocytic leukemia.

Indole-3-carboxylic acid is an orally active urinary indolic tryptophan metabolite. Indole-3-carboxylic acid is a mediator of priming against Plectosphaerella cucumerina. Indole-3-carboxylic acid enhances the anti-colorectal cancer potency of Doxorubicin (HY-15142A) by inducing cell senescence. Indole-3-carboxylic acid can be used in liver disease research.

Tryptamine is a selective, blood-brain-penetrating 5-HT4 receptor agonist (EC50=1-3 mM) and an endogenous ligand of the aryl hydrocarbon receptor (AHR) (Kd=10-50 nM). Tryptamine promotes intestinal anion secretion and fluid transport by activating G protein-coupled receptors (GPCRs) and accelerates gastrointestinal motility. Tryptamine regulates Th17/Treg balance to inhibit neuroinflammation, competitively binds to 5-HT receptors to regulate central nervous system activity, and participates in temperature regulation and spinal reflex regulation as a neuromodulator. Tryptamine can be used to study intestinal motility disorders such as functional constipation, and has shown significant efficacy in multiple sclerosis models.