Vm. Lee et Sk. Pixley, AGE AND DIFFERENTIATION-RELATED DIFFERENCES IN NEURON-SPECIFIC TUBULIN IMMUNOSTAINING OF OLFACTORY SENSORY NEURONS, Developmental brain research, 83(2), 1994, pp. 209-215
Olfactory sensory neurons (OSNs) are unusual mammalian neurons because
they are produced continually throughout adult life and because their
production is upregulated after injury. Because OSNs also have an unu
sual immunological profile and do not bind the commonly used antibody
markers for neurons, we sought new antibody markers for studies of OSN
regeneration. In this report, we characterize the staining patterns o
f antibodies to the Class III beta, neuron-specific, tubulin (NST) in
rat olfactory tissue sections, to determine if these antibodies specif
ically label OSNs. In tissue sections from newborn rats, monoclonal an
tibodies to NST labeled cell bodies and processes of both immature (ol
factory marker protein, OMP, -negative) and mature (OMP-positive) OSNs
. In tissue sections from adult rats, immature OSNs showed both cell b
ody and dendrite staining with anti-NST, while mature OSNs showed litt
le or no cell body staining. Mature OSNs appeared to have both axonal
and dendritic anti-NST staining. Axonal staining was suggested by the
complete labeling of the olfactory nerve bundles and the nerve fiber l
ayer of the olfactory bulb. The extent of labeling was judged by compa
rison with anti-OMP staining. Mature OSN dendritic staining was sugges
ted because a much higher number of dendrites were anti-NST stained in
the epithelium than cell bodies. These changes suggest both age and d
ifferentiation-related changes in subcellular distribution of NST in O
SNs. NST antibodies are thus good markers for all OSNs in the newborn
rat, but selective markers for immature OSNs and mature OSN processes
in the adult rat. NST antibodies may also be useful probes for PIII tu
bulin function in neurons.