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- W2064506686 abstract "The organization of spinal motor circuitry to the kidney is not well-characterized and changes in renal innervation have been associated with disease states such as hypertension found in the spontaneously hypertensive rat or renal hypertension. Here, we describe the segmental and intra-segmental organization of the spinal motor circuitry that was resolved after neurotropic viral injection into the kidney and retrograde transneuronal transport to the spinal cord. In the first experiment, the serial reconstruction of infected neurons in the thoracolumbar spinal cord from T8-L1 was performed following injection of pseudorabies virus (PRV, Bartha strain) into either the cranial pole, the caudal pole or both the cranial and caudal poles of the left kidney in male rats. In the second experiment, rats received injections of two different PRV strains that were genetically engineered to express unique reporter molecules; one of the engineered strains was injected into the cranial pole and the other was injected into the caudal pole. Either 3- or 4-day post-infection, the animals were anesthetized and sacrificed by transcardial perfusion. PRV-infected neurons were located by immunocytochemistry against either PRV itself (experiment 1) or the unique marker proteins (experiment 2). After injection of both poles of the kidney, the majority of the infected neurons were found in the ipsilateral intermediolateral cell column (IML) from T10 to T12 with the mode at T11. Infected neurons were found in discrete neuron clusters in the intermediolateral cell column along the longitudinal axis in a repeating pattern of high and low density that has been called beading. Three observations indicated a topographic distribution of renal sympathetic preganglionic neurons (SPN). First, after injection into either the cranial or caudal poles of the kidney, the mode of infected cells was located in segments T11 and T12, respectively. The one spinal segment shift in the mode suggested a topographic distribution. Second, in spinal segments T8-L1, comparison of the distributions of the neurons innervating each pole of the left kidney revealed an overlap in the distribution, except in the T11 segment. In the T11 segment, the neurons projecting to each pole tended to segregate into separate populations. Third, in rats that received injections of two PRV strains that were genetically engineered to express unique markers into opposite poles of the kidney, a segregation of neurons projecting to the cranial and caudal poles of the kidney was noted again in the T11 spinal segment and the segregation at adjacent spinal levels was obvious. The analysis of the distribution of infected neurons within each spinal cord segment (intra-segmental distribution) revealed three different patterns along the cranial-caudal dimension. In segments T8-T10, >60% of the infected neurons were located in the caudal half of the spinal segment. In segments T12-L1, >60% of the infected neurons were located in the cranial half of the spinal segment. In segment T11, the neurons were more evenly distributed throughout the segment. These intra-segmental distribution patterns were found after both 3- or 4-day survival periods post-infection and were found in most animals. The distribution of clusters of neurons revealed a similar intra-segmental pattern. Thus, as was described previously for the sympathetic postganglionic neurons that innervate the kidney, the present work indicates a topographic organization in the second-order neurons in the renal sympathetic efferent pathway. The physiological significance of this anatomical organization remains to be determined." @default.
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- W2064506686 date "2002-01-01" @default.
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- W2064506686 title "Distribution of sympathetic preganglionic neurons innervating the kidney in the rat: PRV transneuronal tracing and serial reconstruction" @default.
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- W2064506686 doi "https://doi.org/10.1016/s1566-0702(01)00356-3" @default.
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