{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Fatty acid amide hydrolase (FAAH) is a pivotal metabolic enzyme that terminates endocannabinoid signaling by catalyzing the hydrolysis of bioactive fatty acid amides—most notably the endogenous cannabinoid anandamide—and a variety of N‐acylethanolamines. This hydrolytic activity serves as an essential “gatekeeper” to control the magnitude and duration of endocannabinoid receptor activation in both the central nervous system and peripheral tissues."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "4"}]}, {"type": "t", "text": " In the brain, FAAH‐mediated clearance of anandamide modulates pain perception, reward circuitry, threat processing, and memory formation—findings supported by observations that both pharmacological inhibition and genetic variations reducing FAAH activity lead to elevation of anandamide tone and consequent alterations in CB1 receptor–mediated neurotransmission."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}, {"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " In peripheral tissues, FAAH expression inversely correlates with factors such as visceral adiposity and insulin dysregulation"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": ", and its activity is critical for proper reproductive processes by maintaining the localized “anandamide tone” required for preimplantation embryo development and oviductal transport."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " Moreover, studies of FAAH deletion or inhibition have demonstrated benefits in sustaining analgesia while avoiding cannabinoid receptor desensitization"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": ", protecting against inflammatory and oxidative stress challenges in cardiovascular aging"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": ", and even modulating tumor cell invasion in prostate cancer."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": " Recent functional proteomic analyses have further revealed that, in humans and higher mammals, FAAH exists as two isoforms (FAAH‐1 and the membrane‐associated FAAH‐2) that, while sharing overlapping substrate preferences, differ in tissue distribution and catalytic efficiency."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}, {"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": " Additionally, imaging genetics studies have linked common FAAH polymorphisms with altered limbic and striatal reactivity to emotionally and reward‐related cues."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}, {"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": " Collectively, these data underscore the multifaceted role of FAAH in fine‐tuning endocannabinoid signaling, thereby influencing a broad spectrum of physiological processes—including neuronal excitability, energy metabolism, immune function, reproduction, and potentially tumorigenesis—while also offering promising avenues for therapeutic intervention across diverse disease states.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Jacqueline L Blankman, Gabriel M Simon, Benjamin F Cravatt "}, {"type": "b", "children": [{"type": "t", "text": "A comprehensive profile of brain enzymes that hydrolyze the endocannabinoid 2-arachidonoylglycerol."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Chem Biol (2007)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.chembiol.2007.11.006"}], "href": "https://doi.org/10.1016/j.chembiol.2007.11.006"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "18096503"}], "href": "https://pubmed.ncbi.nlm.nih.gov/18096503"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Binqing Q Wei, Tarjei S Mikkelsen, Michele K McKinney, et al. 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