INVESTIGADORES
GOLOMBEK Diego Andres
artículos
Título:
Suprachiasmatic astrocytes as an interphase for immune-circadian signalling.
Autor/es:
ML LEONE; L MARPEGAN,; T BEKINSCHTEIN,; M COSTAS; DA GOLOMBEK
Revista:
JOURNAL OF NEUROSCIENCE RESEARCH
Referencias:
Año: 2006 vol. 84 p. 1521 - 1527
ISSN:
0360-4012
Resumen:
The hypothalamic suprachiasmatic nuclei (SCN), the site
of a mammalian circadian clock, exhibit a dense immunoreactivity
for glial fibrillary acidic protein (GFAP), a specific
marker for astrocytes. Although there is evidence of
a circadian variation in GFAP-IR in the hamster SCN and
of the participation of glial cells in input and output
mechanisms of the clock, the role of these cells within
the circadian system is not clearly understood. The fact
that astroglia can express and respond to cytokines suggests
that they could work as mediators of immune signals
to the circadian system. In the present study, we
have found a daily variation of GFAP-IR in the mouse
SCN, peaking during the light phase. In addition, we have
identified GFAP and nuclear factor-jB (NF-jB) in glial
cells within the SCN and in primary cultures of the
mouse SCN. Moreover, SCN glia cultures were transfected
with an NF-jB/luc construct whose transcriptional
activity was increased with lipopolysaccharide 2 lg/ml,
tumor necrosis factor-a 20 ng/ml, or interleukin-1a 100 ng/
ml, after 12 hr of stimulation. These results suggest that
the glial cells of the SCN can mediate input signals to
the mouse circadian system coming from the immune
system via NF-jB signaling. jB (NF-jB) in glial
cells within the SCN and in primary cultures of the
mouse SCN. Moreover, SCN glia cultures were transfected
with an NF-jB/luc construct whose transcriptional
activity was increased with lipopolysaccharide 2 lg/ml,
tumor necrosis factor-a 20 ng/ml, or interleukin-1a 100 ng/
ml, after 12 hr of stimulation. These results suggest that
the glial cells of the SCN can mediate input signals to
the mouse circadian system coming from the immune
system via NF-jB signaling. jB/luc construct whose transcriptional
activity was increased with lipopolysaccharide 2 lg/ml,
tumor necrosis factor-a 20 ng/ml, or interleukin-1a 100 ng/
ml, after 12 hr of stimulation. These results suggest that
the glial cells of the SCN can mediate input signals to
the mouse circadian system coming from the immune
system via NF-jB signaling. lg/ml,
tumor necrosis factor-a 20 ng/ml, or interleukin-1a 100 ng/
ml, after 12 hr of stimulation. These results suggest that
the glial cells of the SCN can mediate input signals to
the mouse circadian system coming from the immune
system via NF-jB signaling. a 20 ng/ml, or interleukin-1a 100 ng/
ml, after 12 hr of stimulation. These results suggest that
the glial cells of the SCN can mediate input signals to
the mouse circadian system coming from the immune
system via NF-jB signaling. jB signaling.