Immunocytochemical analysis of photoreceptors in the tiger salamander retina

Nov 4, 2008Vision research

Detailed study of light-sensing cells in the tiger salamander's eye

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Abstract

On average, large rods and small S-cone opsin positive rods accounted for 98.6% and 1.4% of all rods, respectively.

Six distinct types of photoreceptors exist in the tiger salamander retina, including large/small rods and large/small cones.
Glutamate antibodies labeled all photoreceptors, while recovering antibodies showed strong labeling of cones and weak labeling of rods.
Calbindin antibodies selectively stained accessory members of double cones.
Differential connections between rods/cones and bipolar/horizontal cells were observed, indicating varied input strengths.
AMPA receptor subunits GluR2/3 and GluR4 were widely distributed at rod/cone synapses, suggesting their role in neurotransmission.
Different functional pathways may convey visual signals to the inner retina based on the type of photoreceptor involved.

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In the tiger salamander retina, visual signals are transmitted to the inner retina via six morphologically distinct types of photoreceptors: large/small rods, large/small single cones, and double cones composed of principal and accessory members. The objective of this study was to determine the morphology of these photoreceptors and their synaptic interconnection with bipolar cells and horizontal cells in the outer plexiform layer (OPL). Here we showed that glutamate antibodies labeled all photoreceptors and recovering antibodies strongly labeled all cones and weakly labeled all rods. Antibodies against calbindin selectively stained accessory members of double cones. Antibodies against S-cone opsin stained small rods, a subpopulation of small single cones, and the outer segments of accessory double cones and a subtype of unidentified single cones. On average, large rods and small S-cone opsin positive rods accounted for 98.6% and 1.4% of all rods, respectively. Large/small cones, principle/accessory double cones, S-cone opsin positive small single cones, and S-cone opsin positive unidentified single cones accounted for about 66.9%, 23%, 4.5%, and 5.6% of the total cones, respectively. Moreover, the differential connection between rods/cones and bipolar/horizontal cells and the wide distribution of AMPA receptor subunits GluR2/3 and GluR4 at the rod/cone synapses were observed. These results provide anatomical evidence for the physiological findings that bipolar/horizontal cells in the salamander retina are driven by rod/cone inputs of different weights, and that AMPA receptors play an important role in glutamatergic neurotransmission at the first visual synapses. The different photoreceptors selectively contacting bipolar and horizontal cells support the idea that visual signals may be conveyed to the inner retina by different functional pathways in the outer retina.

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Immunocytochemical analysis of photoreceptors in the tiger salamander retina

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