Application of leukocyte immunoglobulin like receptor B4 (LILRB4) to preparation of medicine for preventing, alleviating and/or treating cardiac hypertrophy
A technology of immunoglobulin and myocardial hypertrophy, which is applied in the field of gene function and application, can solve problems such as LILRB4 that has not been seen, and achieve the effect of inhibiting myocardial hypertrophy and improving heart function
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Embodiment 1
[0045] [Example 1] Construction of heart-specific LILRB4 knockout mice:
[0046] Using CRISPR-Cas9 technology to construct heart-specific LILRB4 gene knockout mice (for the construction strategy, see figure 1 ). First, a CRISPR targeting site was designed in the front non-coding region of exon 1 and intron 2 of the mouse LILRB4 gene through the online CRISPR design tool (http: / / crispr.mit.edu), and the target sequences were respectively for:
[0047] LILRB4sgRNA1:ggTAGGATGTCAGAGTTGCAGCGTGG,
[0048] LILRB4sgRNA2: ggATTCCTCAAAATGGTGATGGGGGG.
[0049] In addition, a donor vector (Donor Vector) for homology repair was designed, which included homology arms on both sides, exons 1 and 2 in the middle, and two loxp sequences in the same direction.
[0050] (1) Construction of targeting vector: The two primers corresponding to sgRNA1 and sgRNA2 were fused into double-stranded DNA, and then ligated into pUC57-sgRNA vector treated with restriction endonuclease BsaI with T4 DNA liga...
Embodiment 2
[0066] [Example 2] Establishment of mouse cardiac hypertrophy model
[0067] 1. Grouping of experimental animals: male background C57BL / 6 cardiac-specific Cre mice (α-MHC-Cre (WT), cardiac-specific LILRB4 gene knockout mice (LILRB4-KO), established myocardial muscle by aortic constriction Hypertrophy model. Randomly divided into 4 groups, grouped as follows: C57BL / 6 background wild-type mice sham operation group (WT Sham) and AB operation group (WT AB), LILRB4 gene knockout mouse sham operation group (LILRB4-KO Sham ) and AB group (LILRB4-KO AB).
[0068] 2. The myocardial hypertrophy model adopts aortic arch coarctation (AB) surgery, and the operation process of the model is as follows:
[0069] 2.1 Preoperative preparation
[0070] (1) Anesthesia: weigh the mice first, calculate the required amount of anesthetic (3% pentobarbital sodium) according to 90 mg / kg body weight, inject intraperitoneally, and record the injection time point. There is no obvious reaction between t...
Embodiment 3
[0077] [Example 3] Myocardial hypertrophy and fibrosis evaluation of mouse cardiac hypertrophy model
[0078] 1. Take materials
[0079] (1) Preliminary work: prepare in advance a urine cup filled with 20 mL of 10% formaldehyde by volume, and label it (mouse number, group, type of operation and date of collection). Place a petri dish filled with 10% KCl solution in mass fraction at the sampling site. Turn on the analytical balance and set it to zero for later use. Mice were then weighed and sacrificed.
[0080] (2) Material collection: Ophthalmic curved tweezers clamped the vascular pedicle below the atrial appendage, cut off the heart, and quickly placed it in 10% KCl solution by mass fraction. After the heart stops beating in the diastolic phase, place it on sterilized gauze, gently squeeze the fluid in the heart cavity, dip the surface fluid dry, weigh and record, put the heart into the corresponding urine cup, fix it for 48 hours and use it for pathological testing.
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