China Animal Husbandry and Veterinary Medicine ›› 2023, Vol. 50 ›› Issue (11): 4392-4402.doi: 10.16431/j.cnki.1671-7236.2023.11.008

• Biotechnology • Previous Articles     Next Articles

Generation of Mrjp1 Gene Knock-in Mice with Specific Expression in Vascular Smooth Muscle Cells via CRISPR/Cas9 Strategy

SHA Fangfang1, FAN Pei1,2, YANG Peichang1, ZHANG Lu1, LI Jianke2   

  1. 1. School of Biological Engineering, Henan University of Technology, Zhengzhou 450001, China;
    2. Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100193, China
  • Received:2023-04-18 Online:2023-11-05 Published:2023-10-27

Abstract: 【Objective】 The aim of this study was to disclose whether the introduction of major royal jelly protein 1 (MRJP1) to vascular smooth muscle cells (VSMCs) could regulate mice blood pressure in vivo.【Method】 Based on the CRISPR/Cas9 strategy, the gRNA to Hipp11 site, Cas9, and donor vector containing honeybee Mrjp1 cDNA with the upstream Sm22α promoter were co-injected to embryos to produce the Mrjp1 gene knock-in mice that Mrjp1 gene specifically expressed in VSMCs, followed by the verification of knock-in correctness.The systolic and diastolic blood pressures of different days and Media/Lumen area ratios of thoracic aorta for wild type (WT) and homozygous (Mrjp1+/+) mice with continuous angiotensinⅡ(AngⅡ) infusion by mini-osmotic pumps implanted subcutaneously on the back were compared.【Result】 The heterozygous (Mrjp1+/-) mice were generated by crossing F0 chimeric with WT mice.PCR amplification and sequencing, as well as Southern blotting, for homology fragments showed that Mrjp1 gene was successfully integrated into the Hipp11 site of mouse chromosome.The WT, Mrjp1+/- and Mrjp1+/+mice were generated through Mrjp1+/-mating.Mrjp1 gene was able to transcript and translate in thoracic aorta.Continuously induced by AngⅡ, the blood pressure, including systolic and diastolic, of the Mrjp1+/+ mice showed the lower trend than that of the WT.To be exact, the systolic blood pressure at the days of 3, 6, 9 and 12 were significantly different(P<0.05), and the diastolic blood pressure at the days of 3 (P<0.05) and 6 (P<0.01) were significantly different.After the treatment of AngⅡ, the Media/Lumen area ratio of thoracic aorta of Mrjp1+/+ mice was also significantly lower than that of the WT (P<0.05). 【Conclusion】 The specific knock-in of Mrjp1 gene to VSMCs inhibited the mice blood pressure stimulated by AngⅡ in vivo.The current work would cast light on the in-depth elucidation of MRJP1 function and the precise utilization of royal jelly.

Key words: CRISPR/Cas9; mice; gene knock-in; major royal jelly protein 1; blood pressure regulation

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