Congruence of zebrin II expression and functional zones defined by climbing fiber topography in the flocculus.

Abstract:

:The cerebellum is organized into parasagittal zones with respect to the topography of climbing fiber (CF) afferents and the expression of molecular markers such as zebrin II. Zebrin is expressed by a subset of Purkinje cells that are distributed as a parasagittal array of immunopositive and immunonegative stripes. Several studies in rodents suggest that, in general, CFs to the zebrin negative stripes convey somatosensory information, whereas CFs to the zebrin positive stripes convey information from visual and other sensory systems. The pigeon flocculus consists of four pairs of zebrin+/- stripes (P4 +/- through P7 +/-), however the CF input consists entirely of visual inputs. Thus, because the correspondence of zebrin expression and CF information must be different from that proposed for rodents, we investigated this relationship in the pigeon flocculus. Floccular Purkinje cells respond to patterns of optic flow resulting from self-rotation about one of two axes: either the vertical axis (zones 0 and 2), or a horizontal axis (zones 1 and 3). Visual CF afferents projecting to the flocculus arise from the medial column of the inferior olive (mcIO). Zones 0 and 2 receive input from the caudal mcIO, whereas zones 1 and 3 receive input from the rostral mcIO. We injected a fluorescent anterograde tracer into the rostral and/or caudal mcIO and visualized zebrin expression. There was a strict concordance between CF organization and zebrin labeling: caudal mcIO injections resulted in CFs in zebrin bands P4 +/- and P6 +/-, whereas rostral mcIO injections resulted in CFs in zebrin bands P5 +/- and P7 +/-. Thus, zebrin stripes P4 +/- and P6 +/- correspond to the vertical axis zones 0 and 2, whereas P5 +/- and P7 +/- correspond to the horizontal axis zones 1 and 3. This is the first explicit demonstration that a series of zebrin stripes corresponds with functional zones in the cerebellum.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Pakan JM,Wylie DR

doi

10.1016/j.neuroscience.2008.08.062

subject

Has Abstract

pub_date

2008-11-11 00:00:00

pages

57-69

issue

1

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(08)01286-4

journal_volume

157

pub_type

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