title: Acetaminophen, via its reactive metabolite N-acetyl-p-benzo-quinoneimine and transient receptor potential ankyrin-1 stimulation, causes neurogenic inflammation in the airways and other tissues in rodents.
abstract: Acetaminophen [N-acetyl-p-aminophenol (APAP)] is the most common antipyretic/analgesic medicine worldwide. If APAP is overdosed, its metabolite, N-acetyl-p-benzo-quinoneimine (NAPQI), causes liver damage. However, epidemiological evidence has associated previous use of therapeutic APAP doses with the risk of chronic obstructive pulmonary disease (COPD) and asthma. The transient receptor potential ankyrin-1 (TRPA1) channel is expressed by peptidergic primary sensory neurons. Because NAPQI, like other TRPA1 activators, is an electrophilic molecule, we hypothesized that APAP, via NAPQI, stimulates TRPA1, thus causing airway neurogenic inflammation. NAPQI selectively excites human recombinant and native (neuroblastoma cells) TRPA1. TRPA1 activation by NAPQI releases proinflammatory neuropeptides (substance P and calcitonin gene-related peptide) from sensory nerve terminals in rodent airways, thereby causing neurogenic edema and neutrophilia. Single or repeated administration of therapeutic (15-60 mg/kg) APAP doses to mice produces detectable levels of NAPQI in the lung, and increases neutrophil numbers, myeloperoxidase activity, and cytokine and chemokine levels in the airways or skin. Inflammatory responses evoked by NAPQI and APAP are abated by TRPA1 antagonism or are absent in TRPA1-deficient mice. This novel pathway, distinguished from the tissue-damaging effect of NAPQI, may contribute to the risk of COPD and asthma associated with therapeutic APAP use.
authors: Department of Preclinical and Clinical Pharmacology, University of Florence, Florence, Italy.
authors: Romina
authors: R
authors: Nassini
authors: Serena
authors: S
authors: Materazzi
authors: Eunice
authors: E
authors: Andrè
authors: Laura
authors: L
authors: Sartiani
authors: Giancarlo
authors: G
authors: Aldini
authors: Marcello
authors: M
authors: Trevisani
authors: Chiara
authors: C
authors: Carnini
authors: Daniela
authors: D
authors: Massi
authors: Pamela
authors: P
authors: Pedretti
authors: Marina
authors: M
authors: Carini
authors: Elisabetta
authors: E
authors: Cerbai
authors: Delia
authors: D
authors: Preti
authors: Gino
authors: G
authors: Villetti
authors: Maurizio
authors: M
authors: Civelli
authors: Gabriela
authors: G
authors: Trevisan
authors: Chiara
authors: C
authors: Azzari
authors: Susan
authors: S
authors: Stokesberry
authors: Laura
authors: L
authors: Sadofsky
authors: Lorcan
authors: L
authors: McGarvey
authors: Riccardo
authors: R
authors: Patacchini
authors: Pierangelo
authors: P
authors: Geppetti
mesh_terms: D000082:Acetaminophen / Q000009:adverse effects* / Q000378:metabolism*; D000171:Acrolein / Q000031:analogs & derivatives / Q000494:pharmacology; D018712:Analgesics, Non-Narcotic / Q000009:adverse effects* / Q000378:metabolism; D000818:Animals; D001249:Asthma / Q000139:chemically induced; D016227:Benzoquinones; D018893:Bronchoalveolar Lavage; D002118:Calcium / Q000378:metabolism; D002460:Cell Line; D002853:Chromatography, Liquid; D006168:Guinea Pigs; D006801:Humans; D007097:Imines; D007150:Immunohistochemistry; D008297:Male; D051379:Mice; D029424:Pulmonary Disease, Chronic Obstructive / Q000139:chemically induced; D021241:Spectrometry, Mass, Electrospray Ionization; D000074025:TRPA1 Cation Channel; D053719:Tandem Mass Spectrometry; D050051:Transient Receptor Potential Channels / Q000819:agonists* / Q000235:genetics / Q000378:metabolism*
chemical_list: D018712:Analgesics, Non-Narcotic; D016227:Benzoquinones; D007097:Imines; D000074025:TRPA1 Cation Channel; D050051:Transient Receptor Potential Channels; C475685:Trpa1 protein, mouse; D000082:Acetaminophen; D000171:Acrolein; C028473:N-acetyl-4-benzoquinoneimine; C012843:cinnamaldehyde; D002118:Calcium