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VIP-like immunoreactivity within neurons and perivascular neuronal processes of the human cerebral cortex
V Benagiano1, D Virgintino, E Maiorano
1Istituto di Anatomia Umana Normale, Università di Bari.
Insights
Neurons containing Vasoactive Intestinal Polypeptide (VIP) were found near blood vessels in the human parietal cortex. This suggests VIP plays a role in regulating cerebral blood flow and potentially the blood-brain barrier.
Area of Science:
- Neuroscience
- Cerebrovascular Research
- Immunocytochemistry
Background:
- Vasoactive Intestinal Polypeptide (VIP) is a neuropeptide with known vasodilatory properties.
- The precise localization and function of VIP in the human cerebral vasculature remain incompletely understood.
Purpose of the Study:
- To investigate the presence and anatomical distribution of VIP-like immunoreactivity in neurons associated with the cerebral vasculature in the human parietal cortex.
- To explore the potential role of VIP in the regulation of cerebral blood flow and blood-brain barrier function.
Main Methods:
- Indirect immunocytochemical techniques were employed to detect VIP-like immunoreactivity.
- Neuronal VIP distribution was examined in relation to arterioles, capillaries, and perivascular structures within the human parietal lobe.
Main Results:
- Neurons exhibiting VIP-like immunoreactivity were identified in various cortical layers of the human parietal lobe.
- Perivascular VIP-like immunoreactive neuronal processes were observed in arterioles and capillaries, interacting with smooth muscle, endothelium-pericyte layers, and glial sheaths.
- Positive neuronal cell bodies were found adhering to capillary walls.
Conclusions:
- The perivascular localization of VIP-like immunoreactivity provides morphological evidence for VIP's role in regulating human cerebral blood flow.
- The observed interactions between VIP-immunoreactive neuronal processes and perivascular glia support the hypothesis that VIP is involved in blood-brain barrier functioning.
Abstract:
Using indirect immunocytochemical techniques, neurons with VIP (Vasoactive Intestinal Polypeptide)-like immunoreactivity (ir) have been demonstrated in the human cerebral cortex of the parietal lobe. In all the cortical layers containing positive neurons, perivascular immunoreactive neuronal processes have been detected: in arterioles, they are located in the adventitial and smooth muscle layers; in capillaries, they establish tight anatomical relations with the endothelium-pericyte layer and the perivascular glial sheath. Bodies of positive neurons have also been seen adhering to capillary walls. The detection of perivascular VIP-like ir provides morphological evidence of the role played by this polypeptide in the regulation of the cerebral blood flow. Moreover, the relationships between immunoreactive neuronal processes and perivascular glia might corroborate the suggestion that VIP is involved in the functioning of the blood-brain barrier.
