Systems-level adaptations explain chronic tolerance development to nitrous oxide hypothermia in young and mature rats.

Systems-level adaptations explain chronic tolerance development to nitrous oxide hypothermia in young and mature rats. Research Abstract Details 

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Systems-level adaptations explain chronic tolerance development to nitrous oxide hypothermia in young and mature rats. Abstract Text:

Karl J Kaiyala,Shehzad Butt,Douglas S Ramsay,

RATIONALE: Nitrous oxide (N(2)O) can initially lower core temperature (T (core)), but hypothermic tolerance develops with chronic administration. Therefore, one or both of T (core)'s controlling determinants, heat production (HP) and heat loss (HL), must adapt across repeated N(2)O administrations. Simultaneous measurements of HP, HL, and T (core) during chronic N(2)O administrations will elucidate this adaptive process and constitute a rigorous model for studying the systems-level dynamics of tolerance in both mature and young animals. This approach is justified by the need to better understand the increased vulnerability to addiction associated with adolescent drug use. OBJECTIVES: The objective of the study was to measure HL and HP across repeated steady-state administrations of 60% N(2)O in young and mature rats. MATERIALS AND METHODS: Synchronous measurements of HP (indirect calorimetry), HL (direct calorimetry), and T (core) (telemetry) were obtained during 60% N(2)O administrations in adolescent (28-45 days, n = 11) and mature rats (>90 days, n = 8). Rats received five 90-min drug exposures (every other day). RESULTS: Compared to mature rats, adolescents initially exhibited greater hypothermia, but acquired tolerance more rapidly and actually developed hyperthermia during the fifth administration. In both groups, N(2)O consistently increased HL, but progressive increases of intrasessional HP over repeated administrations prevented hypothermia and subsequently promoted hyperthermia in adolescent rats. CONCLUSIONS: Adolescent rats hyper-adapt to N(2)O hypothermia. Increases of intrasessional HP across N(2)O administrations explained both tolerance to N(2)O hypothermia and the unexpected hyperthermia observed in adolescents. These findings raise the possibility that the increased vulnerability to addiction associated with adolescent drug use involves a hyper-adaptive tolerance mechanism.

Systems-level adaptations explain chronic tolerance development to nitrous oxide hypothermia in young and mature rats. Publishing Authors By Initials

KJ Kaiyala,S Butt,DS Ramsay,

For similar natural sciences: time: time factors research abstracts see: natural sciences: time: time factors research

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Systems-level adaptations explain chronic tolerance development to nitrous oxide hypothermia in young and mature rats. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Psychopharmacology

VOLUME: 191

Page Numbers: 233-42

Journal Abbreviation: Psychopharmacology (Berl.)

ISSN: 0033-3158

DAY: 10

MONTH: 01

YEAR: 2007

Systems-level adaptations explain chronic tolerance development to nitrous oxide hypothermia in young and mature rats. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 7608025

Systems-level adaptations explain chronic tolerance development to nitrous oxide hypothermia in young and mature rats. Keywords Mesh Terms:

KEYWORDS: Time Factors

MESH TERMS: drug effects

Chemical & Substance for Abstract: Systems-level adaptations explain chronic tolerance development to nitrous oxide hypothermia in young and mature rats. Information

Substance Name: Nitrous Oxide

Registry Number: 10024-97-2

Grant and Affiliation Information for Systems-level adaptations explain chronic tolerance development to nitrous oxide hypothermia in young and mature rats.

AFFILIATION: Department of Dental Public Health Sciences, University of Washington, Box 357475, Seattle, WA 98195-7475, USA. kkaiyala@u.washington.edu

Country: Germany

AGENCY: United States NIDA

GRANT: DA14545

ACRONYM: DA

MEDLINETA: Psychopharmacology (Berl)

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