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2014 ; 592
(22
): 5065-78
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Single unit hyperactivity and bursting in the auditory thalamus of awake rats
directly correlates with behavioural evidence of tinnitus
#MMPMID25217380
Kalappa BI
; Brozoski TJ
; Turner JG
; Caspary DM
J Physiol
2014[Nov]; 592
(22
): 5065-78
PMID25217380
show ga
Tinnitus is an auditory percept without an environmental acoustic correlate.
Contemporary tinnitus models hypothesize tinnitus to be a consequence of
maladaptive plasticity-induced disturbance of excitation-inhibition homeostasis,
possibly convergent on medial geniculate body (MGB, auditory thalamus) and
related neuronal networks. The MGB is an obligate acoustic relay in a unique
position to gate auditory signals to higher-order auditory and limbic centres.
Tinnitus-related maladaptive plastic changes of MGB-related neuronal networks may
affect the gating function of MGB and enhance gain in central auditory and
non-auditory neuronal networks, resulting in tinnitus. The present study examined
the discharge properties of MGB neurons in the sound-exposure gap inhibition
animal model of tinnitus. MGB single unit responses were obtained from awake
unexposed controls and sound-exposed adult rats with behavioural evidence of
tinnitus. MGB units in animals with tinnitus exhibited enhanced spontaneous
firing, altered burst properties and increased rate-level function slope when
driven by broadband noise and tones at the unit's characteristic frequency.
Elevated patterns of neuronal activity and altered bursting showed a significant
positive correlation with animals' tinnitus scores. Altered activity of MGB
neurons revealed additional features of auditory system plasticity associated
with tinnitus, which may provide a testable assay for future therapeutic and
diagnostic development.