Dural invasion of meningioma: a histological and immunohistochemical study
Goro Nagashima1, Tsukasa Fujimoto, Ryuta Suzuki
1Department of Neurosurgery, Fujigaoka Hospital, Showa University, 1-30 Fujigaoka, Yokohama, Kanagawa, 227-8501, Japan. goro-n@po1.dti2.ne.jp
Abstract:
Meningioma usually grows and expands into the brain, but invasion into the brain parenchyma is relatively rare. Meningioma arises from arachnoid cap cells, and infiltration into dura mater is the main growth pattern of meningiomas. However, little is known about the mechanism of meningioma invasion into the dura mater. In this study, seven specimens, including dural attachments, from seven cases of meningioma were used for immunohistochemical analysis. Matrix metalloproteinase (MMP)-1, -2, -9, urokinase-type plasminogen activator (uPA), vascular endothelial growth factors (VEGF), flt-1, E-cadherin, estrogen receptor (EgR), progesterone receptor (PgR), and aquaporin (AQP)-1, -4 were used as primary antibodies. There were several patterns of meningioma invasion into the dura mater: papillary-shaped invasion with destruction of dural structure, infiltration along the fibers of the dura mater, and invasion of several tumor cell units with fibroblast infiltration. Strong immunostaining was obtained with MMP-1, followed by AQP-1 and uPA, within the invading tumor cells. Neovasculature and extravasated erythrocytes, which stained with AQP-1, were also occasionally observed around the invading tumor cells. Simpson grade II removal of meningiomas results in high recurrence rates, and the inhibition of meningioma growth via dural invasion will facilitate improved remission in many cases with meningioma. In this study, MMP-1, AQP-1, and uPA are considered to have some role in the dural infiltration of meningioma cells. The fact that AQP-1 was highly expressed at the dural attachment and invading front of meningioma may indicate that dural invasion of the meningioma may be facilitated by AQP-1-induced water flow and neovascularization.
Insights
Meningioma dural invasion is facilitated by matrix metalloproteinase-1 (MMP-1), aquaporin-1 (AQP-1), and urokinase-type plasminogen activator (uPA). These molecules play key roles in meningioma infiltration into the dura mater, potentially improving treatment outcomes.
Area of Science:
- Neuro-oncology
- Cell biology
- Biochemistry
Background:
- Meningiomas, tumors arising from arachnoid cap cells, typically grow outwards but rarely invade brain parenchyma.
- Dural infiltration is a common growth pattern, yet the underlying mechanisms remain poorly understood.
- Understanding dural invasion is crucial for improving meningioma treatment and reducing recurrence rates, especially after Simpson grade II resection.
Purpose of the Study:
- To investigate the molecular mechanisms of meningioma invasion into the dura mater.
- To identify key proteins involved in dural infiltration and their potential role in tumor progression.
Main Methods:
- Immunohistochemical analysis of seven meningioma specimens, including dural attachments.
- Primary antibodies used targeted matrix metalloproteinase (MMP)-1, -2, -9, urokinase-type plasminogen activator (uPA), vascular endothelial growth factors (VEGF), flt-1, E-cadherin, estrogen receptor (EgR), progesterone receptor (PgR), and aquaporin (AQP)-1, -4.
Main Results:
- Strong immunostaining for MMP-1, AQP-1, and uPA was observed within invading meningioma cells.
- Distinct invasion patterns included papillary-shaped destruction, along dural fibers, and tumor cell clusters with fibroblast infiltration.
- AQP-1 staining was prominent at the dural attachment and invading front, associated with neovasculature and extravasated erythrocytes.
Conclusions:
- MMP-1, AQP-1, and uPA are implicated in the dural infiltration of meningioma cells.
- AQP-1 may facilitate dural invasion through water flow and neovascularization, highlighting its potential as a therapeutic target.
