Somatostatin (SRIF) and SRIF receptors in the mouse retina

被引:52
作者
Cristiani, R [1 ]
Petrucci, C [1 ]
Dal Monte, M [1 ]
Bagnoli, P [1 ]
机构
[1] Univ Pisa, Dipartimento Fisiol & Biochim G Moruzzi, I-56127 Pisa, Italy
关键词
somatostatinergic system; retinal cell; RT-PCR; immunocytochemistry; confocal microscopy;
D O I
10.1016/S0006-8993(02)02450-2
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
In the retina, somatostatin (SRIF) acts as a neuromodulator by interacting with specific SRIF subtype (sst) receptors. The aim of this study was to detect mRNAs for sst(1-5) receptors by semiquantitative RT-PCR and to determine the cellular localization of either SRIF or individual SRIF receptor immunoreactivities. Size, density and absolute number of immunolabeled somata were measured using computer-assisted image analysis. With RT-PCR we found that all five sst receptor mRNAs were expressed, with highest levels of sst, and sst(4) receptors. SRIF immunolabeling was localized to sparse-occurring amacrine cells in the inner nuclear layer (INL) and to displaced amacrine cells in the ganglion cell layer (GCL). sst(2A) receptors were localized to protein kinase- (PKC) immunoreactive (IR) rod bipolar cells, calbindin- (CaBP-) IR horizontal cells, tyrosine hydroxylase- (TH-) IR amacrine cells and glycinergic amacrine cells. None of the sst(2A)-IR amacrine cells were found to express parvalbumin (PV) immunoreactivity. sst(4) receptor immunolabeling was localized to CaBP-IR and CaBP-non-IR cells in the GCL that originated long process bundles in the GC axon layer. These cells were not observed after optic nerve transection and they were therefore interpreted as ganglion cells. Quantitative analysis showed that all of the PKC-IR rod bipolar cells, CaBP-IR horizontal cells, and TH-IR amacrine cells and 5% of the glycinergic amacrine cells expressed sst,A receptors. In addition, 4-6% of the putative ganglion cells expressed sst(4) receptors. The localization of SRIF to sparse-occurring retinal neurons, together with the widespread expression of sst(2A) and sst(4) receptors suggests that SRIF acts at multiple levels of retinal circuitry. These results provide a database for investigations of the functional retinal networks in mice with genetic alterations of somatostatinergic transmission. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:1 / 14
页数:14
相关论文
共 76 条
[11]  
Cristiani R, 2000, INVEST OPHTH VIS SCI, V41, P3191
[12]  
DACHEUX RF, 1986, J NEUROSCI, V6, P331
[13]   PARACRINE CONTROL OF PHOTOMEMBRANE REMOVAL [J].
DAHL, NA .
NEUROCHEMICAL RESEARCH, 1992, 17 (01) :67-73
[14]  
DRAGER UC, 1981, INVEST OPHTH VIS SCI, V20, P285
[15]   Transient somatostatin-immunoreactive ganglion cells in the developing rat retina [J].
Fontanesi, G ;
Casini, G ;
Thanos, S ;
Bagnoli, P .
DEVELOPMENTAL BRAIN RESEARCH, 1997, 103 (02) :119-125
[16]   Postnatal development of somatostatin 2A (sst2A) receptors expression in the rabbit retina [J].
Fontanesi, G ;
Gargini, C ;
Bagnoli, P .
DEVELOPMENTAL BRAIN RESEARCH, 2000, 123 (01) :67-80
[17]   The spatial organization of cholinergic mosaics in the adult mouse retina [J].
Galli-Resta, L ;
Novelli, E ;
Volpini, M ;
Strettoi, E .
EUROPEAN JOURNAL OF NEUROSCIENCE, 2000, 12 (10) :3819-3822
[18]   Reciprocal synaptic interactions between rod bipolar cells and amacrine cells in the rat retina [J].
Hartveit, E .
JOURNAL OF NEUROPHYSIOLOGY, 1999, 81 (06) :2923-2936
[19]   AN ENDOPLASMIC RETICULUM-SPECIFIC CYCLOPHILIN [J].
HASEL, KW ;
GLASS, JR ;
GODBOUT, M ;
SUTCLIFFE, JG .
MOLECULAR AND CELLULAR BIOLOGY, 1991, 11 (07) :3484-3491
[20]   Evidence that somatostatin sst2 receptors mediate striatal dopamine release [J].
Hathway, GJ ;
Humphrey, PPA ;
Kendrick, KM .
BRITISH JOURNAL OF PHARMACOLOGY, 1999, 128 (06) :1346-1352