title: Anti-lymphoproliferative activity of brown adipose tissue of hibernating ground squirrels is mainly caused by AMP.
abstract: A fraction with mol wt < 1 kDa was obtained from the brown fat of hibernating ground squirrels (Citellus undulatus) by means of delipidization, acid extraction, ultracentrifugation and ultrafiltration. This fraction suppressed the proliferation of mouse lymph node cells under standard mitogenic stimuli for T lymphocytes. In contrast, the fraction with mol wt < 1 kDa obtained from the brown fat of active ground squirrels in spring did not display such activity. Further HPLC purification of the biologically active fraction and chemical and structural analysis of its most potent antilymphoproliferative component revealed that this is adenosine 5'-monophosphate (AMP). These data lend support to the notion that in hibernating mammals AMP originating, at least partly, from the brown fat down-regulates the seasonally-dependent proliferation of the thymus.
authors.affiliation: UPR 9021-Immunochimie des Peptides et des Virus, Institut de Biologie Moléculaire et Cellulaire du C.N.R.S., Strasbourg, France.
authors.forename: C L
authors.initials: CL
authors.lastname: Atanassov
authors.forename: H U
authors.initials: HU
authors.lastname: Naegeli
authors.forename: G
authors.initials: G
authors.lastname: Zenke
authors.forename: C
authors.initials: C
authors.lastname: Schneider
authors.forename: L I
authors.initials: LI
authors.lastname: Kramarova
authors.forename: G E
authors.initials: GE
authors.lastname: Bronnikov
authors.forename: M H
authors.initials: MH
authors.lastname: Van Regenmortel
mesh_terms: D000249:Adenosine Monophosphate / Q000302:isolation & purification / Q000494:pharmacology*; D002001:Adipose Tissue, Brown / Q000737:chemistry*; D000818:Animals; D002455:Cell Division / Q000187:drug effects; D005591:Chemical Fractionation; D002851:Chromatography, High Pressure Liquid; D015536:Down-Regulation; D005260:Female; D006605:Hibernation; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008970:Molecular Weight; D012589:Sciuridae; D013601:T-Lymphocytes / Q000166:cytology / Q000187:drug effects*; D013950:Thymus Gland / Q000166:cytology / Q000187:drug effects; D014461:Ultracentrifugation; D014462:Ultrafiltration
chemical_list: D000249:Adenosine Monophosphate