Carbon monoxide (CO) (CO)

Carbon monoxide (CO) is a diatomic gas that serves as an endogenous gasotransmitter, primarily produced during the degradation of heme by the enzyme heme oxygenase (HO) (Source: PubChem CID 281; StatPearls, Carbon Monoxide Toxicity). While historically recognized as a lethal toxin due to its high affinity for hemoglobin, CO is now understood to play essential roles in regulating vascular tone, suppressing inflammation, and preventing apoptosis (Source: Motterlini & Otterbein, Nature Reviews Drug Discovery, 2010). It exerts these effects by activating soluble guanylate cyclase and modulating intracellular signaling cascades such as the p38 MAPK pathway (Source: PubMed, PMID: 15190022). In clinical development, CO is being explored as a therapeutic agent for conditions like organ transplant rejection, sepsis, and chronic obstructive pulmonary disease (COPD) (Source: ClinicalTrials.gov). The primary challenge in its therapeutic use is the risk of systemic toxicity and impaired oxygen transport, necessitating precise delivery systems like CO-releasing molecules (CORMs) or controlled inhalation (Source: Wikipedia, Carbon monoxide-releasing molecules).

Other names

Carbonic oxideCarbon(II) oxide

Carbon monoxide acts primarily by binding to the heme iron of soluble guanylate cyclase (sGC), leading to increased production of cyclic guanosine monophosphate (cGMP) (Source: PubMed, PMID: 10617683). It also modulates various signaling pathways, including the mitogen-activated protein kinase (MAPK) pathways, and interacts with mitochondrial cytochrome c oxidase to influence cellular respiration and reactive oxygen species production (Source: Nature Reviews Drug Discovery, 2010).