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Comparison of mRNA Expression of P2X Receptor Subtypes in Different Arterial Tissues of Rats
Ling-Zhi Li1, Li-Hui Yue2, Zhi-Min Zhang1
1Department of Anesthesiology, Affiliated Hospital of Hebei University, No. 212 of Yuhua East Road, Lianchi District, Baoding, 071000, China.
Abstract:
This study aims to compare the expression of P2X receptor subtype mRNA in different arterial tissues of rats. After the rats were sacrificed, the internal carotid, pulmonary, thoracic aorta, mesenteric and caudal arteries were dissected out. Then, the P2X receptor mRNA expression in different blood vessels was detected by reverse transcription-polymerase chain reaction (RT-PCR) and real-time quantitative polymerase chain reaction. The P2X1, P2X4 and P2X7 receptor mRNA amplification products revealed specific bands of the same size as the amplified target fragment in their respective lanes, while the P2X2, P2X3, P2X5 and P2X6 receptor mRNA amplification products did not reveal significant specific bands in their respective lanes by RT-PCR. Based on the P2X1 receptor mRNA expression of the mesenteric artery, there were no significant differences in the internal carotid, pulmonary and thoracic aorta (0.64 ± 0.07, 0.17 ± 0.11 and 1.49 ± 0.65, respectively). However, the P2X1 receptor mRNA expression level in the caudal artery significantly increased (11.06 ± 1.99, P < 0.01). Furthermore, there was no difference in P2X4 receptor mRNA expression among these five blood vessels (P > 0.05). The P2X7 receptor mRNA expression level was significantly different: pulmonary artery < tail artery = thoracic aorta < internal carotid artery < mesenteric artery. The relative P2X1 receptor mRNA expression in the caudal artery was observed to be elevated when compared to that of the internal carotid, pulmonary and thoracic aorta as well as the mesenteric arteries. The P2X7 receptor mRNA expression level is pulmonary artery < caudal artery = thoracic aorta < internal carotid artery < mesenteric artery. P2X4 receptor mRNA expression was not significantly different among these five blood vessels.
Insights
This study investigated P2X receptor mRNA expression in rat arteries. P2X1 receptor mRNA significantly increased in caudal arteries, while P2X7 receptor mRNA varied across vessels, highlighting differential P2X receptor roles in arterial tissues.
Area of Science:
- Cardiovascular Biology
- Molecular Biology
- Pharmacology
Background:
- P2X receptors are ATP-gated ion channels implicated in various physiological processes.
- Their expression and function in different arterial beds are not fully elucidated.
- Understanding subtype-specific expression is crucial for targeted therapeutic interventions.
Purpose of the Study:
- To compare the messenger RNA (mRNA) expression levels of distinct P2X receptor subtypes across various rat arterial tissues.
- To identify which P2X receptor subtypes are expressed in the internal carotid, pulmonary, thoracic aorta, mesenteric, and caudal arteries.
- To quantify the relative expression of P2X1, P2X4, and P2X7 receptor mRNA in these vascular segments.
Main Methods:
- Dissection of five major rat arterial types: internal carotid, pulmonary, thoracic aorta, mesenteric, and caudal arteries.
- Detection of P2X receptor subtype mRNA using reverse transcription-polymerase chain reaction (RT-PCR) and real-time quantitative PCR.
- Analysis of specific amplification products for P2X1, P2X4, and P2X7 receptor mRNA.
Main Results:
- P2X1, P2X4, and P2X7 receptor mRNA were detected, while P2X2, P2X3, P2X5, and P2X6 showed no significant specific bands via RT-PCR.
- P2X1 receptor mRNA expression was significantly elevated in the caudal artery compared to other analyzed arteries.
- P2X7 receptor mRNA expression exhibited significant differences across the arterial tissues, with a distinct gradient observed.
- P2X4 receptor mRNA expression levels did not significantly differ among the five arterial types.
Conclusions:
- The caudal artery shows a notably higher expression of P2X1 receptor mRNA.
- P2X7 receptor mRNA expression is differentially regulated across rat arterial tissues.
- These findings suggest distinct roles for P2X receptor subtypes in the physiology of different vascular beds, particularly P2X1 and P2X7 in caudal and other arteries respectively.
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