title: Tail-pinch stress and REM sleep deprivation differentially affect sensorimotor gating function in modafinil-treated rats.
abstract: Prepulse inhibition (PPI) is a phenomenon in which a mild stimulus attenuates a cross-modality startle response to later intense stimulation. PPI is thought to index the central inhibitory mechanism through which behavioural responses are filtered. The present study compared the effects of two stress paradigms on the acoustic startle response (ASR) and on PPI in a rat model. The tail-pinch (TP) method produces an acute and immediate stressful condition, whereas rapid eye movement (REM) sleep deprivation (REMSD) leads to a more persistent and long-term stress. Our results demonstrated that in rats, TP stress reduced the size of the ASR, and REMSD impaired PPI. The wake-promoting agent modafinil (MOD) had no effect on PPI if given alone. However, MOD reduced the ASR and PPI under TP stress, whereas only PPI was reduced by MOD after 96 h of REMSD. These results suggest that distinct stress paradigms differentially mediated sensorimotor gating abilities in terms of either responsiveness to the stimulus or information-filtering capabilities.
authors.affiliation: Department of Physiology and Biophysics, National Defence Medical Centre, Taipei, Taiwan, ROC. yiaping@ms75.hinet.net
authors.forename: Yia-Ping
authors.initials: YP
authors.lastname: Liu
authors.forename: Che-Se
authors.initials: CS
authors.lastname: Tung
authors.forename: Chia-Hsin
authors.initials: CH
authors.lastname: Chuang
authors.forename: Shih-Mao
authors.initials: SM
authors.lastname: Lo
authors.forename: Yu-Chi
authors.initials: YC
authors.lastname: Ku
mesh_terms: D000161:Acoustic Stimulation; D000818:Animals; D001559:Benzhydryl Compounds / Q000494:pharmacology*; D000697:Central Nervous System Stimulants / Q000494:pharmacology*; D008297:Male; D000077408:Modafinil; D010812:Physical Stimulation; D051381:Rats; D017207:Rats, Sprague-Dawley; D013216:Reflex, Startle / Q000187:drug effects; D055139:Sensory Gating / Q000187:drug effects / Q000502:physiology*; D012892:Sleep Deprivation / Q000523:psychology*; D012895:Sleep, REM / Q000187:drug effects / Q000502:physiology*; D013315:Stress, Psychological / Q000523:psychology*
chemical_list: D001559:Benzhydryl Compounds; D000697:Central Nervous System Stimulants; D000077408:Modafinil