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Anastassiadis C, Jones SL, Pruessner JC. Imaging the pituitary in psychopathologies: a review of in vivo magnetic resonance imaging studies. Brain Struct Funct 2019; 224:2587-2601. [DOI: 10.1007/s00429-019-01942-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 08/13/2019] [Indexed: 12/17/2022]
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Anwer M, Immonen R, Hayward NMEA, Ndode-Ekane XE, Puhakka N, Gröhn O, Pitkänen A. Lateral fluid-percussion injury leads to pituitary atrophy in rats. Sci Rep 2019; 9:11819. [PMID: 31413303 PMCID: PMC6694150 DOI: 10.1038/s41598-019-48404-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Accepted: 08/02/2019] [Indexed: 12/26/2022] Open
Abstract
Traumatic brain injury (TBI) causes neuroendocrine dysregulation in up to 40% of humans, which is related to impaired function of the hypothalamo-hypophyseal axis and contributes to TBI-related co-morbidities. Our objective was to investigate whether hypophyseal atrophy can be recapitulated in rat lateral fluid-percussion injury model of human TBI. High-resolution structural magnetic resonance images (MRI) were acquired from rats at 2 days and 5 months post-TBI. To measure the lobe-specific volumetric changes, manganese-enhanced MRI (MEMRI) scans were acquired from rats at 8 months post-TBI, which also underwent the pentylenetetrazol (PTZ) seizure susceptibility and Morris water-maze spatial memory tests. MRI revealed no differences in the total hypophyseal volume between TBI and controls at 2 days, 5 months or 8 months post-TBI. Surprisingly, MEMRI at 8 months post-TBI indicated a 17% reduction in neurohypophyseal volume in the TBI group as compared to controls (1.04 ± 0.05 mm3 vs 1.25 ± 0.05 mm3, p < 0.05). Moreover, neurohypophyseal volume inversely correlated with the number of PTZ-induced epileptiform discharges and the mean latency to platform in the Morris water-maze test. Our data demonstrate that TBI leads to neurohypophyseal lobe-specific atrophy and may serve as a prognostic biomarker for post-TBI outcome.
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Affiliation(s)
- Mehwish Anwer
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Riikka Immonen
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Nick M E A Hayward
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | | | - Noora Puhakka
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Olli Gröhn
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Asla Pitkänen
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland.
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Feng Z, Ou Y, Zhou M, Wu G, Ma L, Bao Y, Qiu B, Qi S. A rat model for pituitary stalk electric lesion-induced central diabetes insipidus: application of 3D printing and further outcome assessments. Exp Anim 2018; 67:383-392. [PMID: 29681579 PMCID: PMC6083024 DOI: 10.1538/expanim.18-0014] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
A stable and reproducible rat injury model is not currently available to study central
diabetes insipidus (CDI) and the neurohypophyseal system. In addition, a system is needed
to assess the severity of CDI and measure the accompanying neurobiological alterations. In
the present study, a 3D-printed lesion knife with a curved head was designed to fit into
the stereotaxic instrument. The neuro-anatomical features of the brain injury were
determined by in vivo magnetic resonance imaging (MRI) and arginine
vasopressin (AVP) immunostaining on brain sections. Rats that underwent pituitary stalk
electrical lesion (PEL) exhibited a tri-phasic pattern of CDI. MRI revealed that the
hyperintenseT1-weighted signal of the pituitary stalk was interrupted, and the brain
sections showed an enlarged end proximal to the injury site after PEL. In addition, the
number of AVP-positive cells in supraoptic nucleus (SON) and paraventricular nucleus (PVN)
decreased after PEL, which confirmed the success of the CDI model. Unlike hand-made tools,
the 3D-printed lesion knives were stable and reproducible. Next, we used an ordinal
clustering method for staging and the k-means’ clustering method to construct a CDI index
to evaluate the severity and recovery of CDI that could be used in other multiple animals,
even in clinical research. In conclusion, we established a standard PEL model with a
3D-printed knife tool and proposed a CDI index that will greatly facilitate further
research on CDI.
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Affiliation(s)
- Zhanpeng Feng
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, No. 1838, North of Guangzhou Avenue, No. 1038, North Guangzhou Avenue, Baiyun District, Guangzhou 510515, P.R. China
| | - Yichao Ou
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, No. 1838, North of Guangzhou Avenue, No. 1038, North Guangzhou Avenue, Baiyun District, Guangzhou 510515, P.R. China
| | - Mingfeng Zhou
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, No. 1838, North of Guangzhou Avenue, No. 1038, North Guangzhou Avenue, Baiyun District, Guangzhou 510515, P.R. China
| | - Guangsen Wu
- The First School of Clinical Medicine, Southern Medical University, No. 1023, South Shatai Road, Baiyun District, Guangzhou 510515, P.R. China
| | - Linzi Ma
- The First School of Clinical Medicine, Southern Medical University, No. 1023, South Shatai Road, Baiyun District, Guangzhou 510515, P.R. China
| | - Yun Bao
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, No. 1838, North of Guangzhou Avenue, No. 1038, North Guangzhou Avenue, Baiyun District, Guangzhou 510515, P.R. China
| | - Binghui Qiu
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, No. 1838, North of Guangzhou Avenue, No. 1038, North Guangzhou Avenue, Baiyun District, Guangzhou 510515, P.R. China
| | - Songtao Qi
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, No. 1838, North of Guangzhou Avenue, No. 1038, North Guangzhou Avenue, Baiyun District, Guangzhou 510515, P.R. China
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Vieira AC, Martínez JMC, Pose RB, Queijo ÁA, Posadas NA, López LMB. Dose-response and histopathological study, with special attention to the hypophysis, of the differential effects of domoic acid on rats and mice. Microsc Res Tech 2015; 78:396-403. [DOI: 10.1002/jemt.22486] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Revised: 01/09/2015] [Accepted: 02/14/2015] [Indexed: 12/17/2022]
Affiliation(s)
| | | | - Roberto Bermúdez Pose
- Departamento de Anatomía y Producción Animal; Facultad de Veterinaria; Lugo 27002 Spain
| | | | - Nuria Alemañ Posadas
- Departamento de Anatomía y Producción Animal; Facultad de Veterinaria; Lugo 27002 Spain
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Conchou F, Sautet J, Raharison F, Mogicato G. Magnetic resonance imaging of normal nasal cavity and paranasal sinuses in cats. Anat Histol Embryol 2011; 41:60-7. [PMID: 21895743 DOI: 10.1111/j.1439-0264.2011.01104.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A detailed description of the nasal cavity and paranasal sinuses in clinically normal cats using magnetic resonance imaging (MRI) is presented. The heads of seven normal cats were imaged using a 1.5-T MR unit and two sequences spin echo (SE) T1-weighted and fast spin echo (FSE) T2-weighted. Eighteen relevant MR scans were taken in the transverse (12 scans) and dorsal (six scans) planes. Anatomical structures were identified and labelled using anatomical texts, sectioned specimen heads and previous studies. MR scans revealed the soft-tissue structure of the head. Identified relevant anatomical structures seen on MRI will assist clinicians to better understand MR images and evaluate pathological conditions that affect the nasal region.
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Affiliation(s)
- F Conchou
- Groupe de Recherches pour Animaux de Compagnie, ENVT, Toulouse, Cedex, France
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