Objective To observe the changes of the blood pressure after intracerebral hemorrhage (ICH) in spontaneously hypertensive rats (SHRs) as well as the expressions of α2A-adrenergic receptor (AR) in center (brain tissue) and peripheral (renal tissue) α1A-AR and to investigate the correlation between α1A-AR/α2A-AR and blood pressure regulation in acute hypertensive ICH. Methads A total of 30 six-month-old male SHRs were randomly divided into a sham-operation group and ICH (day 1,3, 7 and 14) groups (n =6 in each group). Blood pressure was measured by the tail-cuff method. Collagenase Ⅳ was injected into caudate-puta-men nucleus to induce a model of ICH. The expressions of α1A-AR and α2A-AR were detected by using immunohistochemistry and reverse-transcription polymerase chain reaction. Results One day after ICH, the blood pressure was 195.4 ± 8.39 mm Hg, and it was significantly higher than 177.8 ± 8.69 mm Hg (P = 0. 000) before ICH and 184. 1 ± 3.76 mm Hg in the sham-operation group (P=0. 002). At day 3 it was 185.3 ±9.22 mm Hg, and it was lower than that at day 1. It was 177.7 ±5.62 mm Hg and 176.7 ±6. 06 mm Hg at day7 and 14 respectively, which almost returned to the normal level before ICH. The α1A-AR mRNA and protein in renal tissue at day 1 after ICH were 0. 91 ±0. 013 and 0. 944 ±0. 142%, respectively, They were higher than 0. 89 ±0. 018 and0. 779 ±0. 103% in the sham-operation group, and they reached the peak (0. 93 ±0.015, P =0.008; 1.526 ± 0.296%, P =0.010) at day 3. The α2A-AR mRNA and protein in brain tissue were 0. 93 ±0. 020 and 2.64 ±0. 293% at day 3 after ICH, and they were significantly higher than 0. 86 ±0. 019 (P =0. 001) and 1. 070 ±0. 155% (P = 0. 020), and0.87 ±0. 029 (P =0. 000) at day 1 after ICH and 1. 629 ±0. 488% (P =0. 023) in the sham-operation group. The changes of blood pressure in the ICH day 1 to day 7 grottos in SHRs and correlation coefficient of α2A-AR mRNA absorbance in brain tissue r was - 0. 509 (P = 0.031), and the correlation coefficient of α2A-AR protein-expression volume fraction in brain tissue r was - 0. 473 (P = 0. 047). Conelusions Regulation of blood pressure during acute ICH may have certain correlation with the up-expressions of α2A-AR in brain tissue and α1A-AR in renal tissue.%目的 观察自发性高血压大鼠(spontaneously hypertensive rat,SHR)脑出血后血压变化以及中枢(脑组织)-肾上腺素能受体(adrenergic receptor,AR)和外周(肾组织)α1A-AR的表达,探讨高血压脑出血急性期α1A-AR和α2A-AR与血压调控的相关性.方法 30只6月龄雄性SHR,随机分为假手术组和脑出血1 d、3 d、7 d和14 d组,每组6只.尾袖法测定血压;尾壳核注入Ⅳ型胶原酶建立脑出血模型;逆转录聚合酶链反应和免疫组织化学染色法检测α2A-AR和α2A-AR mRNA和蛋白表达.结果 脑出血后1 d时血压为(195.4 ±8.39)mm Hg,显著高于出血前的(177.8±8.69)mm Hg(P=0.00)和假手术组的(184.1±3.76)mm Hg(P=0.002),3 d时为(185.3±9.22)mm Hg,较1 d时下降,7 d和14d时分别为(177.7±5.62)mm Hg和(176.67±6.06)mm Hg,基本恢复至出血前水平.肾组织α2A-AR mRNA和蛋白在脑出血后1 d时分别为(0.91±0.013)和(0.944±0.142)%,高于假手术组的(0.89±0.018)和(0.779±0.103)%,3 d时达高峰,为(0.93±0.015)(P=0.008)和(1.526 ±0.296)%(P=0.010);(3)脑出血3 d时脑组织俚α2A-AR mRNA和蛋白为(0.93±0.020)和(2.64±0.293)%,显著高于假手术组的(0.86 ±0.019)(P=0.001)和(1.070±0.155)%(P=0.020)以及脑出血1 d时的(0.87±0.029)(P=0.000)和(1.629±0.488)%(P=0.023).脑出血1 d组～7 d组血压变化与脑组织α2A-AR mRNA吸光度的相关系数r=-0.509(P=0.031),与脑组织α2A-AR蛋白表达容积分数的相关系数r=-0.473(P=0.047).结论 急性脑出血的血压调控可能与脑组织α2A-AR和肾组织α2A-AR表达上调有一定的相关性.
展开▼
