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Open Access 08-04-2022 | Original Article

Neuronal nitric oxyde synthase positive neurons in human indusium griseum

Authors: Teresa Lorenzi, Andrea Sagrati, Eva Montanari, Martina Senzacqua, Manrico Morroni, Mara Fabri

Published in: Brain Structure and Function | Issue 6/2022

Abstract

The study was designed to analyze the nNOS positive neurons present in the indusium griseum by describing their distribution and morphology. To this purpose, sagittal serial sections from paraffin or frozen autopsy specimens of corpus callosum including the overlying indusium griseum were processed by immunohistochemistry and immunofluorescence, using an antibody against the neuronal form of the enzyme nitric oxyde synthase. To test the specificity of the antibody used, Western Blot was performed in the indusium griseum of the same specimens. The stainings revealed the presence of many neuronal nitric oxyde synthase-immunopositive neurons in human indusium griseum, located along both rostral-caudal and medio-lateral directions. In particular, they were more numerous 1 mm apart from the midline, and their number peaked over the body of the corpus callosum. They showed different morphologies; in some cases, they were located at the boundary between indusium griseum and corpus callosum, more densely packed in proximity to the pial arteries penetrating into the corpus callosum. The significant presence and distribution of neuronal nitric oxyde synthase-immunopositive neurons suggests that indusium griseum likely plays a functional role in the neurovascular regulation within the corpus callosum.

Graphical abstract

Schematic representation of human adult IG and the neurovascular unit originating from sopracallosal artery (Sca) that branches into smaller arterioles (Br) (created in PowerPoint). The arterioles cross the three layers of IG (layers I, II and III) and penetrate into the CC separated from IG by the Virchow-Robin space (VRs). As the arterioles go deeper, this space disappears and the vascular basement membrane comes into direct contact with the astrocytic end-feets (intracallosal arterioles and capillaries). nNOS-immunopositive neurons (nNOS_IP N) surround the arterioles and control the vasomotore tone secreting nitric oxyde (NO). Two morphological types of nNOS_IP N can be appreciated by the use of different colors: fusiform (blue) and ovoidal (pink). Also NeuN-immunopositive neurons (N) and many astrocytes (As) are present, more numerous in IG than in CC.

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Title: Neuronal nitric oxyde synthase positive neurons in human indusium griseum
Authors: Teresa Lorenzi
Andrea Sagrati
Eva Montanari
Martina Senzacqua
Manrico Morroni
Mara Fabri
Publication date: 08-04-2022
Publisher: Springer Berlin Heidelberg
Published in: Brain Structure and Function / Issue 6/2022
Print ISSN: 1863-2653
Electronic ISSN: 1863-2661
DOI: https://doi.org/10.1007/s00429-022-02484-z

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Neuronal nitric oxyde synthase positive neurons in human indusium griseum

Abstract

Graphical abstract

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Graphical abstract

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