Substance P-like-immunoreactive neurons in the photosensory pineal organ of the rainbow trout, Salmo gairdneri Richardson (Teleostei)

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Substance P-like-immunoreactive neurons in the photosensory pineal organ of the rainbow trout, Salmo gairdneri Richardson (Teleostei). / Ekström, Peter; Korf, Horst W.

In: Cell and Tissue Research, Vol. 246, No. 2, 01.11.1986, p. 359-364.

Research output: Contribution to journalArticle

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T1 - Substance P-like-immunoreactive neurons in the photosensory pineal organ of the rainbow trout, Salmo gairdneri Richardson (Teleostei)

AU - Ekström, Peter

AU - Korf, Horst W.

PY - 1986/11/1

Y1 - 1986/11/1

N2 - Restricted numbers of substance P-like-immuno-reactive (SPL-IR) neurons were demonstrated in the photosensory pineal organ of the rainbow trout. The small parapineal organ of this teleost species receives a distinct SPL-IR innervation via the habenular nuclei, but displays no intrinsic SPL-IR neurons. Intrapineal SPL-IR neurons were located in the rostral portion of the pineal end-vesicle. Neuronal somata were found in a lateral position with smooth axonal processes extending mediad. Immunoreactive somata and axonal processes were observed intraparenchymally as well as in the pineal lumen. The pattern of immunoreactivity was not changed in excised pineal organs that had been incubated in tissue culture medium in the dark for 18 h. The possibility that the intrapineal SPL-IR neurons are not part of the neural circuitry involved in the transduction of photic information, but may have other functions, is discussed.

AB - Restricted numbers of substance P-like-immuno-reactive (SPL-IR) neurons were demonstrated in the photosensory pineal organ of the rainbow trout. The small parapineal organ of this teleost species receives a distinct SPL-IR innervation via the habenular nuclei, but displays no intrinsic SPL-IR neurons. Intrapineal SPL-IR neurons were located in the rostral portion of the pineal end-vesicle. Neuronal somata were found in a lateral position with smooth axonal processes extending mediad. Immunoreactive somata and axonal processes were observed intraparenchymally as well as in the pineal lumen. The pattern of immunoreactivity was not changed in excised pineal organs that had been incubated in tissue culture medium in the dark for 18 h. The possibility that the intrapineal SPL-IR neurons are not part of the neural circuitry involved in the transduction of photic information, but may have other functions, is discussed.

KW - Immunohistochemistry

KW - Neuronal types

KW - Pineal organ

KW - Salmo gairdneri (Teleostei)

KW - Substance P

UR - http://www.scopus.com/inward/record.url?scp=0022550006&partnerID=8YFLogxK

U2 - 10.1007/BF00215898

DO - 10.1007/BF00215898

M3 - Article

VL - 246

SP - 359

EP - 364

JO - Cell and Tissue Research

JF - Cell and Tissue Research

SN - 1432-0878

IS - 2

ER -