Acute stress alters transcript expression pattern and reduces processing of proBDNF to mature BDNF in Dicentrarchus labrax.
BACKGROUND
Stress involves alterations of brain functioning that may precipitate to mood disorders. The neurotrophin Brain Derived Neurotrophic Factor (BDNF) has recently been involved in stress-induced adaptation. BDNF is a key regulator of neuronal plasticity and adaptive processes. Regulation of BDNF is complex and may reflect not only stress-specific mechanisms but also hormonal and emotional responses. For this reason we used, as an animal model of stress, a fish whose brain organization is very similar to that of higher vertebrates, but is generally considered free of emotional reactions.


RESULTS
We provide a comprehensive characterization of BDNF gene in the Dicentrarchus labrax and its transcriptional, translational and post-translational regulation following acute stress. While total BDNF mRNA levels are unchanged, BDNF transcripts 1c and 1d resulted down regulated after acute stress. Acute stress induces also a significant increase in proBDNF levels and reduction in mature BDNF suggesting altered regulation of proBDNF proteolytic processing. Notably, we provide here the first evidence that fishes possess a simplified proteolytic regulation of BDNF since the pro28Kda form, generated by the SKI-1 protease in mammals, is absent in fishes because the cleavage site has first emerged in reptilians. Finally, we show that the proBDNF/totBDNF ratio is a highly predictive novel quantitative biomarker to detect stress in fishes with sensitivity = 100%, specificity = 87%, and Negative Predictive Value = 100%.


CONCLUSIONS
The high predictivity of proBDNF/totBDNF ratio for stress in lower vertebrates indicates that processing of BDNF is a central mechanism in adaptation to stress and predicts that a similar regulation of pro/mature BDNF has likely been conserved throughout evolution of vertebrates from fish to man.
Tognoli
Chiara
C
Department of Biotechnology and Molecular Science, University of Insubria, Varese, Italy.
Rossi
Federica
F
Di Cola
Francesco
F
Baj
Gabriele
G
Tongiorgi
Enrico
E
Terova
Genciana
G
Saroglia
Marco
M
Bernardini
Giovanni
G
Gornati
Rosalba
R
D000208:Acute Disease; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001492:Bass; D015415:Biomarkers / Q000378:metabolism; D019208:Brain-Derived Neurotrophic Factor / Q000235:genetics* / Q000378:metabolism*; D004195:Disease Models, Animal; D005786:Gene Expression Regulation; D008969:Molecular Sequence Data; D014176:Protein Biosynthesis; D020033:Protein Isoforms / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D012680:Sensitivity and Specificity; D017385:Sequence Homology; D013315:Stress, Psychological / Q000175:diagnosis / Q000235:genetics* / Q000378:metabolism*; D014158:Transcription, Genetic
D015415:Biomarkers; D019208:Brain-Derived Neurotrophic Factor; D020033:Protein Isoforms; D012333:RNA, Messenger