Zachary R Harmony1, Erin M Alderson2, Israel Garcia-Carachure3, Laurence D Bituin4, Cynthia A Crawford5. 1. Department of Psychology, California State University, San Bernardino, 5500 University Parkway, San Bernardino, CA 92407, USA; Department of Psychology, Louisiana State University, Baton Rouge, LA 70803, USA. 2. Department of Psychology, California State University, San Bernardino, 5500 University Parkway, San Bernardino, CA 92407, USA; Department of Psychology, University of California, Riverside, 900 University Ave, Riverside, CA 92521, USA. 3. Department of Psychology, California State University, San Bernardino, 5500 University Parkway, San Bernardino, CA 92407, USA; Department of Psychology, University of Texas, El Paso, 500 W University, El Paso, TX 79902, USA. 4. Department of Psychology, California State University, San Bernardino, 5500 University Parkway, San Bernardino, CA 92407, USA. 5. Department of Psychology, California State University, San Bernardino, 5500 University Parkway, San Bernardino, CA 92407, USA. Electronic address: ccrawfor@csusb.edu.
Abstract
BACKGROUND: Adolescent nicotine exposure increases methamphetamine (MA) intake in adult male rats; however, little is known about how nicotine affects MA self-administration during the adolescent period. Therefore, we assessed whether exposing rats to nicotine during early or late adolescence affects oral MA self-administration. METHODS: 146 male and female rats were treated with saline or nicotine (0.16 or 0.64 mg/kg) from postnatal day (PD) 25-PD 34 (the early exposure phase) and/or PD 35-PD 55 (the late exposure phase). Rats began an oral MA self-administration procedure on PD 35. RESULTS: Only the sex variable, but not nicotine, affected sucrose and MA acquisition, as female rats had more nose pokes than males during training. On the test sessions, female rats exposed to nicotine (0.64 mg/kg) in the early exposure phase had more active nose pokes than saline-treated female rats or nicotine-treated male rats. Rats exposed to nicotine (0.16 mg/kg) in the late exposure phase had fewer active nose pokes during testing than rats exposed to saline. Nose poke responding during extinction was not altered by nicotine exposure, but administering nicotine (0.16 or 0.64 mg/kg) to male rats in the early exposure phase did decrease nose pokes during the drug-primed reinstatement session. CONCLUSIONS: Our results show that adolescent female rats are more sensitive to the reinforcing effects of oral sucrose and MA than adolescent males, and that preadolescent nicotine exposure enhances oral MA self-administration in female rats. These findings suggest that preteen nicotine use may increase vulnerability to later MA abuse in teenage girls.
BACKGROUND: Adolescent nicotine exposure increases methamphetamine (MA) intake in adult male rats; however, little is known about how nicotine affects MA self-administration during the adolescent period. Therefore, we assessed whether exposing rats to nicotine during early or late adolescence affects oral MA self-administration. METHODS: 146 male and female rats were treated with saline or nicotine (0.16 or 0.64 mg/kg) from postnatal day (PD) 25-PD 34 (the early exposure phase) and/or PD 35-PD 55 (the late exposure phase). Rats began an oral MA self-administration procedure on PD 35. RESULTS: Only the sex variable, but not nicotine, affected sucrose and MA acquisition, as female rats had more nose pokes than males during training. On the test sessions, female rats exposed to nicotine (0.64 mg/kg) in the early exposure phase had more active nose pokes than saline-treated female rats or nicotine-treated male rats. Rats exposed to nicotine (0.16 mg/kg) in the late exposure phase had fewer active nose pokes during testing than rats exposed to saline. Nose poke responding during extinction was not altered by nicotine exposure, but administering nicotine (0.16 or 0.64 mg/kg) to male rats in the early exposure phase did decrease nose pokes during the drug-primed reinstatement session. CONCLUSIONS: Our results show that adolescent female rats are more sensitive to the reinforcing effects of oral sucrose and MA than adolescent males, and that preadolescent nicotine exposure enhances oral MA self-administration in female rats. These findings suggest that preteen nicotine use may increase vulnerability to later MA abuse in teenage girls.
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