RT Journal Article T1 Plasma Amino Acid Concentrations in Patients with Alcohol and/or Cocaine Use Disorders and Their Association with Psychiatric Comorbidity and Sex. A1 García-Marchena, Nuria A1 Marcos, Alberto A1 Flores-López, María A1 Moreno-Fernández, Mario A1 Requena-Ocaña, Nerea A1 Porras-Perales, Oscar A1 Torres-Galván, Sandra A1 Araos, Pedro A1 Serrano, Antonia A1 Muga, Roberto A1 Ruiz-Ruiz, Juan Jesús A1 Rodríguez de Fonseca, Fernando A1 Ambrosio, Emilio A1 Pavón-Morón, Francisco Javier K1 CE-LIF K1 PRISM K1 abstinence K1 alcohol use disorder K1 amino acids K1 biomarker K1 cocaine use disorder K1 cross-sectional study K1 psychiatric comorbidity K1 sex AB (1) Background: Co-occurrence of mental and substance use disorders (SUD) is prevalent, but complicates their clinical courses, and specific biomarkers are required. Amino acids are altered in primary mental disorders; however, little is known about SUD and psychiatric comorbidity. Because most psychiatric disorders and biomarkers show sex differences, we investigated amino acids in men and women with alcohol and/or cocaine use disorders (AUD and/or CUD) and psychiatric comorbidity. (2) Methods: A cross-sectional study was conducted in 295 participants, who were divided into four groups (AUD, n = 60; CUD, n = 41; AUD + CUD, n = 64; and control, n = 130). Participants were clinically assessed, and plasma amino acid concentrations were analyzed in relation to sex, diagnosis of SUD and psychiatric comorbidity (3) Results: In the total sample, there were sex differences, and women showed lower Iso, Leu, Gln and Glu than men. While patients with CUD and AUD + CUD had higher Glu, Gly, Orn and Ser than controls, patients with AUD showed no differences. In SUD, patients with psychiatric comorbidity had lower Orn and higher Ala than non-comorbid patients in the AUD group. (4) Conclusions: There was a dysregulation of plasma amino acids in abstinent patients with SUD. However, our results suggest the importance of considering the clinical characteristics and sex in the validity of amino acids as potential biomarkers for SUD. SN 2227-9059 YR 2022 FD 2022-05-14 LK http://hdl.handle.net/10668/20832 UL http://hdl.handle.net/10668/20832 LA en DS RISalud RD Apr 5, 2025