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Heparin reduces proliferative angiopathy following subarachnoid hemorrhage in cats
Insights
Systemic heparin reduced proliferative angiopathy after subarachnoid hemorrhage (SAH) in cats. This suggests heparin may inhibit platelet-derived growth factors contributing to cerebral artery damage following SAH.
Area of Science:
- Neurology
- Vascular Biology
- Pathology
Background:
- Subarachnoid hemorrhage (SAH) can lead to secondary brain injury.
- Proliferative angiopathy is a pathological response observed in cerebral arteries after SAH.
- Platelet activation and aggregation are implicated in the vascular response to SAH.
Purpose of the Study:
- To investigate the effect of systemic heparin on the development of proliferative angiopathy following induced SAH in a feline model.
- To explore the potential role of platelet-derived growth factors in SAH-induced vascular remodeling.
Main Methods:
- Subarachnoid hemorrhage was induced in cats by rupturing the middle cerebral artery (MCA).
- Cats were either untreated or received systemic heparin treatment.
- Vascular changes in the MCAs were assessed 16 days post-SAH.
Main Results:
- Untreated cats developed widespread proliferative angiopathy in both MCAs by day 16.
- Heparin treatment significantly reduced pathological changes in the ruptured MCA.
- Proliferative angiopathy was absent in the contralateral MCA of heparin-treated cats.
- Platelet adherence to the subintimal surface of cerebral arteries was observed post-SAH.
Conclusions:
- Systemic heparin administration effectively mitigates proliferative angiopathy following SAH in cats.
- Platelet-derived growth factors released from intimal platelet aggregates are suggested as a stimulus for angiopathy.
- Heparin's inhibitory effect on these platelet factors may prevent SAH-induced vascular pathology.
Abstract:
Subarachnoid hemorrhage (SAH) was produced in cats by transorbital rupture of the right middle cerebral artery (MCA). In untreated cats, widespread proliferative angiopathy occurred in both MCA's by 16 days after SAH. In cats that received systemic heparin, the pathological events following SAH were clearly reduced in the ruptured artery, and were not present in the contralateral left MCA. Platelets are known to adhere to the subintimal surface of cerebral arteries after SAH. The authors suggest that platelet-derived growth factor released from the intimal platelet carpet following SAH may be the stimulus for the development of proliferative angiopathy, and that this platelet factor is inhibited by heparin.