directly

Erlotinib (NSC-718781) is an EGFR inhibitor (IC50: 2 nM). It is used for the treatment of non-small cell lung cancer.

C16 Ceramide (Palmitoyl Ceramide) is a naturally occurring small molecule that activates p53 by directly and selectively binding to it.

Resatorvid (TAK-242), a selective Toll-like receptor 4 (TLR4) inhibitor, binds directly to Cys747 to prevent TLR4-TIRAP interaction, thereby blocking downstream signaling. Resatorvid exhibits antitumor, anti-inflammatory, and neuroprotective activities.

CSRM617 hydrochloride is a selective small-molecule inhibitor of the transcription factor ONECUT2 (OC2, a master regulator of androgen receptor), with a Kd of 7.43 µM in SPR assays, directly binding to the OC2-HOX domain. CSRM617 hydrochloride induces apoptosis through the appearance of cleaved Caspase-3 and PARP and is well tolerated in the mouse model of prostate cancer [1].

Muramyl dipeptide (MDP) is a synthetic immunoreactive peptide, consisting of N-acetyl muramic acid attached to a short amino acid chain of L-Ala-D-isoGln. It indirectly decreases osteoclast differentiation by reducing the RANKL OPG ratio and directly increases osteoblast differentiation by up-regulating Runx2 gene expression through MAPK pathways, thereby inducing bone formation via Runx2.

Lotrifen (Privaprol), an agent of non-hormonal antifertility, causes the arrest and involution of pregnancy. It acts, after the implantation of the blastocyst, directly on the product of conception, which undergoes a slow and gradual degenerative process and ends with the reabsorption or expulsion of it.

Upacicalcet (AJT-240) is an intraventricular calcium mimetic, a SHPT available for human hemodialysis, that inhibits excessive parathyroid hormone (PTH) secretion by directly acting on parathyroid cell membrane calcium-sensitive receptors, thereby lowering blood levels of PTH.Upacicalcet is an orthosteric modulator of calcium-sensitive receptors and prevents adenine-induced secondary vascular calcification and bone disease in a rat model of adenine-induced secondary hyperparathyroidism.

Upacicalcet HCl is an intravesical calcium mimetic that inhibits excessive parathyroid hormone (PTH) secretion by directly acting on calcium-sensitive receptors in parathyroid cell membranes, thereby lowering PTH levels in the blood.Upacicalcet HCl can be used for the treatment of blood Upacicalcet HCl is a novel compound for the treatment of secondary hyperparathyroidism, targeting amino acid-binding sites of calcium-sensitive receptors. binding sites.

(±)4-HDHA (4-Hydroxy docosahexaenoic acid) is a PPARγ agonist with anti-inflammatory activity that directly inhibits endothelial cell proliferation and sprouting angiogenesis via PPARγ, which can be used in the study of diabetes.

Ethaselen (BBSKE) is an orally active and selective thioredoxin reductase 1 (TrxR) inhibitor with anticancer activity that directly inhibits TrxR1 activity and is commonly used in combination with oxaliplatin to inhibit tumor growth.Ethaselen induces apoptosis in cancer cells and inhibits the proliferation of colorectal cancer cells.

(Rac)-Upacicalcet is a racemate of Upacicalcet, which serves as an intravenous calcimimetic agent. Upacicalcet acts by directly targeting calcium-sensing receptors on parathyroid cell membranes, effectively suppressing the release of excessive parathyroid hormone (PTH) and reducing blood PTH levels. This compound holds the potential for researching secondary hyperparathyroidism (SHPT) [1].

Triciferol acts as a multiple ligand with combined VDR agonist and HDAC antagonist activities. Triciferol binds directly to the VDR ( IC 50 =87 nM), and functions as an agonist with 1,25D-like potency on several 1,25D target genes. Triciferol induces marked tubulin hyperacetylation, and augments histone acetylation. Triciferol also exhibits efficacious antiproliferative and cytotoxic activities in cancer cell models in vitro [1].

Avobenzone is a dibenzoylmethane endocrine disruptor that binds directly to estrogen receptor β, acting as an estrogen agonist. It is one of the most widely used filters in sunscreens for photoprotection of skin in the UV band.

Norepinephrine bitartrate acts directly on the α- and β-adrenergic receptors. Norepinephrine Bitartrate is a bitartrate salt of norepinephrine, a synthetic phenylethylamine that mimics the sympathomimetic actions of the endogenous norepinephrine. Clinically, norepinephrine is used as a peripheral vasoconstrictor that causes constriction of arterial and venous beds via its alpha-adrenergic action. It is also used as a potent inotropic and chronotropic stimulator of the heart mediated through its beta-1 adrenergic action.

Estrone (Aquacrine) is an aromatized C18 steroid with a 3-hydroxyl group and a 17-ketone, a major mammalian estrogen. It is converted from ANDROSTENEDIONE directly, or from TESTOSTERONE via ESTRADIOL. In humans, it is produced primarily by the cyclic ovaries, PLACENTA, and the ADIPOSE TISSUE of men and postmenopausal women.

Sodium etidronate (Didronel) is a synthetic therapeutic diphosphonate analog of endogenous pyrophosphate. As a member of the family of drugs known as bisphosphonates, Sodium etidronate differs from endogenous pyrophosphate in its resistance to enzymatic hydrolysis. This agent adsorbs to hydroxyapatite cells and reduces the number of osteoclasts, thereby inhibiting abnormal bone resorption. Etidronate may also directly stimulate bone formation by osteoblasts.

Ritodrine hydrochloride (NSC 291565) binds to and activates beta-2 adrenergic receptors of myometrial cells in the uterus, which decreases the intensity and frequency of uterine contractions. Ritodrine hydrochloride (NSC 291565) is a phenethylamine derivative with tocolytic activity. Specifically, Ritodrine hydrochloride (NSC 291565) probably activates adenyl cyclase, thereby increasing production of cyclic adenosine monophosphate (cAMP), which in turn enhances the efflux of calcium from vascular smooth muscle cells. A lack of intracellular calcium prevents uterine myometrial contractions. In addition, this agent may directly inactivate myosin light chain kinase, a critical enzyme necessary for the initiation of muscle contractions.

Apixaban (BMS-562247-01) is an orally active anticoagulant that inhibits coagulation factor Xa, directly preventing the conversion of prothrombin to thrombin and the formation of cross-linked fibrin clots.

1,4-Diaminobutane Dihydrochloride (1,4-butanediamine Dihydrochloride) has antidepressant and analgesic effects. It regulates plant defense against environmental stresses by directly killing fungi and inducing resistance mechanisms, enhancing post-harvest mango fruit resistance to Colletotrichum gloeosporioides.

Strontium chloride is an agonist of Calcium sensing receptor (CaSR) and directly affects C-type nerve fibers.

A 21960 (Ethyl 2-chloroacetoacetate) inhibits synapse formation between resolvase and two directly repeated res sites, blocks site-specific recombination reactions, and can be used to study bacterial infections.

Tyramine (Uteramine) is an indirect sympathomimetic that occurs naturally in cheese and other foods. Tyramine does not directly activate adrenergic receptors, but it can serve as a substrate for adrenergic uptake systems and MONOAMINE OXIDASE to prolong the actions of adrenergic transmitters. It also provokes transmitter release from adrenergic terminals and may be a neurotransmitter in some invertebrate nervous systems.

Methylcobalamin (Brassinolide) is one active form of vitamin B12 which can directly participate in homocysteine metabolism. It is used to treat some nutritional diseases and other diseases in clinic, such as Alzheimer's disease and rheumatoid arthritis.

3-(Methylthio)propionic acid (4-Thiapentanoic acid) is one of the metabolites of methionine (especially of D-methionine). Cultures of Streptomyces lincolnensis accumulated 3-methylthioacrylic acid in amounts directly related to the concentration of methionine in the medium. The first intermediate in the pathway may be the keto acid, which is then oxidatively decarboxylated to 3-methylthiopropionic acid.