Abstract:
:The presence of calretinin and calbindin immunoreactivity is studied in the retina of larval and adult lamprey and their respective distributions are compared. Calretinin distribution is also studied in the retina of transforming stages. Western blot analysis in brain extracts showed a 29-kDa band with both polyclonal anti-calbindin and anti-calretinin antibodies. Calbindin and calretinin immunoreactivity has shown a partially different distribution. In the adult retina large and small bipolar cells, with respectively stratified or diffuse axons, the inner row of horizontal cells and ganglion cells and/or some amacrine cells were labeled with anti-calretinin antibody. The anti-calbindin antibody labels the same cell types except most of ganglion cells, but the label was less conspicuous. Therefore, the possible existence of these two calcium-binding proteins in the central nervous system of the sea lamprey could be discussed. In the differentiated central retina of larval lampreys, numerous calretinin immunoreactive bipolar and ganglion cells were observed, while, in the lateral retina, only ganglion cells were labeled, accordingly with the lack of differentiation of other neural cell types. CR-ir bipolar cells appeared in the retina by the stage 5 of transformation, i.e. about the time when differentiation of photoreceptors occurs. The comparison of the distribution of calretinin and calbindin between adult and larval central retina of lampreys shows striking differences that could be related to the different functionality of eyes in these two stages of the life cycle of lampreys. In addition, this is the first report on the presence of calcium-binding proteins in the larval and transforming lamprey retina, on the presence of calretinin- and calbindin-immunoreactive horizontal cells in adult lamprey retinas and on the differential stratification of bipolar cell terminals.
journal_name
Brain Resjournal_title
Brain researchauthors
Villar-Cheda B,Abalo XM,Anadón R,Rodicio MCdoi
10.1016/j.brainres.2005.11.014subject
Has Abstractpub_date
2006-01-12 00:00:00pages
118-30issue
1eissn
0006-8993issn
1872-6240pii
S0006-8993(05)01598-2journal_volume
1068pub_type
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