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Effect of muscle pain on c-fos expression and nadph-diaphorase activityin the spinal cord
A.V. Maznychenko
A.A. Bogomoletz Institute of Physiology, National Academy ofSciences of Ukraine, Kiev.
Abstract
Capsaicin (Sigma, 5 mg/1 ml) was unilaterally injected into
dorsal neck muscles (mm. trapezius, splenius) of the cat (n =
6) anesthetized with ?-chloralose. The laminar distribution of
Fos- immunoreactive (Fos-ir) and NADPH-d-reactive neurons
was studied in the sections of the cervical and lumbar seg-
ments. In comparison to sham operated animals (n = 2), 2 h
after capsaicin injection the significant c-fos expression was
found throughout the cervical cord (C1 – C8) ipsilaterally and
lumbar cord bilaterally (L1 – L7), while the predominant mean
number of Fos-ir neurons was detected in the C1 – C4 and L3 –
L6 segments. In cervical spinal cord, c-fos expression was
three times more than in lumbar spinal cord. Dorsal neck nox-
ious stimulation produced widespread c-fos expression in the
large and small labeled cells within lamina I, at the neck of the
dorsal horn (lamina V) and also in the medial part of the inter-
mediate zone (lamina VII) where cells of origin of the long
crossed and uncrossed descending propriospinal pathways to
the lumbar cord were known to be localized. The main accu-
mulations of NADPH-d-reactive cells were registered within
the marginal zone (laminae I and II) and medial part of the
intermediate zone (lamina VII). Fos-ir neurons were co-dis-
tributed with NADPH-d-reactive cells within the marginal
zone, and the neck of the dorsal horn, however, double-stain-
ing spinal neurons were not registered. These results strongly
suggest that the revealed c-fos expression in cervical and lumbar
segments depends on the activity of vanilloid receptors of the
cervical muscles and confirmed the anatomical coupling of
both regions through long propriospinal pathways which may
be underlying in the cervico-lumbar nociceptive processing.
An influence of the spino-cerebro-spinal loop on modulation
c-fos expression in these regions is not excluded also.
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