NDLI: Calcium-binding proteins and metabolic activity in thalamotelencephalic parts of the turtle visual system

Content Provider	Springer Nature Link
Author	Belekhova, M. G. Kenigfest, N. B. Chudiva, T. V.
Copyright Year	2012
Abstract	Distribution of three calcium-binding proteins (CaBPr) calbindin (CB), calretinin (CR), and parvalbumin (PV) in parallel with metabolic activity (cytochrome oxidase, CO) was studied in telencephalic projection zones of the tecto- and thalamofugal visual pathways in experiments on the Horsfield’s terrapin Testudo horsfieldi and the pond tortoise Emys orbicularis. It was shown that the nucleus rotundus (Rot) and dorsal lateral geniculate nucleus (GLd) terminal fields in both zones (dorsolateral region of the anterior ventricular ridge, Advrdl and dorsolateral cortex, Cxdl, respectively) were CB-immunoreactive (-ir) in the both studied turtle species. The highest density of CB-ir terminals and the focus of rotundal projections in the Advrdl core coincided precisely. The GLd terminal field in Cxdl also was CR-ir. The PV contribution to innervation of both projectional zones was much lower, especially to innervation of Cxdl from GLd. In spite of similar CB-ir innervation, the projectional field of the tectofugal pathway of Advrdl had the much higher CO activity than that of the thalamofugal pathway in Cxdl. The neurons immunoreactive to all three CaBPr types were distributed in Cxdl in different ratios in each layer. In the visual Advrdl area the overwhelming majority were PV-ir neurons, whereas CB-ir neurons were absent. The conclusion is made that in spite of the CB- and CB/CR-immunoreactivity predominates over the PV-immunoreactivity in both thalamotelencephalic pathways of the visual system, the tectofugal (rotundo-Advrdl) pathway having the higher metabolic activity.
Starting Page	322
Ending Page	334
Page Count	13
File Format	PDF
ISSN	00220930
Journal	Journal of Evolutionary Biochemistry and Physiology
Volume Number	48
Issue Number	3
e-ISSN	16083202
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2012-08-09
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	turtle visual system calcium-binding proteins cytochrome oxidase activity Biochemistry Evolutionary Biology Animal Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Ecology, Evolution, Behavior and Systematics

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