CN115786246B - Construction method of zebra fish immune non-responsive heart failure model - Google Patents

Construction method of zebra fish immune non-responsive heart failure model Download PDF

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CN115786246B
CN115786246B CN202211627686.8A CN202211627686A CN115786246B CN 115786246 B CN115786246 B CN 115786246B CN 202211627686 A CN202211627686 A CN 202211627686A CN 115786246 B CN115786246 B CN 115786246B
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zebra fish
gfp
myl
heart
heart failure
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CN115786246A (en
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祝辉
廖大龙
王凝
兰朝华
李林蔓
肖雄俊
徐柯伟
周小莉
张镨予
阮茂
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Sichuan University of Science and Engineering
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02A40/00Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/80Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
    • Y02A40/81Aquaculture, e.g. of fish

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Abstract

The invention discloses a method for constructing a zebra fish immune non-responsive heart failure model, which utilizes butyl p-hydroxybenzoate to induce zebra fish embryos so as to obtain the zebra fish immune non-responsive heart failure model. Specifically, selecting a zebra fish embryo with normal development of 5-6hpf, transferring the zebra fish embryo into a zebra fish embryo culture solution added with 1.2-2.0mg/L of butyl p-hydroxybenzoate, culturing at 28-28.5 ℃, changing the solution every 22-24h, and culturing to 3-3.5dpf to obtain the zebra fish immune non-responsive heart failure model. The model test period constructed by the invention is short, and the method is simple to operate.

Description

Construction method of zebra fish immune non-responsive heart failure model
Technical Field
The invention relates to the field of animal models, in particular to a method for inducing and generating a zebra fish immune unresponsive heart failure model by utilizing butyl p-hydroxybenzoate.
Background
Heart failure is a clinical syndrome of cardiac insufficiency due to various heart diseases, and is the final destination of most cardiovascular diseases, and its main symptoms are manifested by dyspnea, fatigue, pulmonary edema, etc. Heart failure disease can result in the heart failing to pump enough blood to meet the metabolic needs of the body, and serious heart failure disease can be life threatening. Heart failure syndrome may be caused by lesions at any level of the heart, including heart muscle, cardiovascular system, pericardium, heart valves, and heart abnormalities, among others.
Compared with the traditional animal models (mice, rats, rabbits, etc.), the zebra fish has the advantages of short growth cycle, high reproductive capacity, transparent zebra fish body in embryo period, easy observation, convenient realization of high throughput screening, and the like. In addition, the genome sequence of zebra fish has homology as high as 87% with human, and the developed molecular and cellular mechanisms are very similar to those of mammal, so that it can effectively simulate the pathological characteristics of human diseases. The heart of zebra fish consists of one ventricle and one atrium, resembling the 3-week human puppy heart, has a heart morphology, physiology, molecules and pathological features that are highly similar to humans, and is the first organ for zebra fish to develop and function, thus zebra fish is an ideal animal model for studying heart disease.
The current methods for modeling heart failure mainly include: pressure overload method, volume load method, myocardial ischemia/myocardial infarction method, and drug method. However, these methods are basically established based on animal models such as mice, rats, rabbits, etc., and mainly have the disadvantages of long test period, complex method, difficult operation, etc. For example, patent document 1 (Bayong, wei Yihong, asterin cloud, etc.) the shen clam san has heart protection effect and mechanism research on pressure-loaded heart failure rats [ J ]. Chinese medicine academic periodical, 2022 (004): 040.) and a pressure-loaded method is adopted to build a rat heart failure model. For example, in document 2 (Wang Siyuan, CHEN WEIDAN, study of Chen xinxin. Adriamycin-induced heart failure model in rats of low age [ J ]. Ind. J.Guangzhou medical school, 2019,047 (001): 10-12, 16.), an Adriamycin pharmaceutical method was used to construct a heart failure model in rats.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: provides a method for constructing a zebra fish immune non-responsive heart failure model with short period and simple method.
The technical scheme of the invention is as follows: the method for constructing the zebra fish immune non-responsive heart failure model utilizes butyl p-hydroxybenzoate to induce zebra fish embryos, so that the zebra fish immune non-responsive heart failure model is obtained.
Further, selecting a zebra fish embryo with normal development of 5-6hpf, transferring the zebra fish embryo into a zebra fish embryo culture solution added with 1.2-2.0mg/L of butyl p-hydroxybenzoate, culturing at 28-28.5 ℃, changing the solution every 22-24h, and culturing to 3-3.5dpf to obtain the zebra fish immune non-responsive heart failure model.
Further, the addition amount of the butyl p-hydroxybenzoate is 1.8mg/L.
Further, 5hpf normal-developing zebra fish embryos were selected.
Further, the culture temperature was 28.5 ℃.
Further, culturing to 3dpf resulted in a zebra fish immune non-responsive heart failure model.
Further, the liquid is changed every 24 hours.
Further, in order to facilitate the visual observation of the physiological condition of zebra fish, the zebra fish employs transgenic labeled zebra fish lines such as Tg (myl: GFP), tg (myl: GFP) by Tg (gata 1: dsred) hybrid zebra fish, tg (myl: GFP) by Tg (mpeg 1: mcherry), tg (myl: GFP) by Tg (lyz: dsred) hybrid zebra fish, and the like.
In the present invention, hpf is an abbreviation of hor post-fertilization, which means that zebra fish fertilize for several hours. Dpf is an abbreviation for day post-fertilization, which refers to zebra fish after fertilization for several days.
The invention also discloses a method for evaluating the zebra fish immune non-responsive heart failure model, which comprises one or more of the following (a) - (c):
(a) The heart development of the transgenic Tg (myl: GFP) zebra fish model was observed using a fluorescence microscope, and the end systole and end diastole images were obtained by the tracker software, further using video recordings.
(B) Observing the quantity, blood volume and blood flow velocity of red blood cells at the heart of the hybridized zebra fish model by fluorescence confocal, integral fluorescence microscopy shooting and combining o-dianisidine staining to observe Tg (myl 7:GFP) x Tg (gata 1: dsred); and detecting endocardial blood flow response gene and natriuretic peptide and brain natriuretic peptide transcription level by qPCR.
(C) The numbers of macrophages and neutral particles in myocardial tissue of the hybridized zebra fish model were observed by fluorescence confocal imaging for Tg (myl: GFP). Times.Tg (mpeg 1: mcherry), tg (myl: GFP). Times.Tg (lyz: dsred); shooting the quantity conditions of whole macrophages and neutral grains of the transgenic zebra fish model with a split fluorescent microscope according to Tg (mfap 4:GFP) and Tg (lyz: dsred); and detecting transcription level of the inflammatory factors related to the heart region by qPCR.
Compared with the prior art, the invention has the following beneficial effects:
1. The test period is short, and the method is simple to operate.
2. The dynamic change of the heart area can be observed in real time.
3. High throughput screening can be performed for drugs that rescue macrophage defects or immune non-responsiveness from causing or exacerbating heart failure.
Drawings
FIG. 1 is a graph showing the effect of different concentrations of butyl parahydroxybenzoate solution on zebra fish heart development in an example; wherein A is a heart phenotype chart under a white light and fluorescent microscope; b, a heart rate change chart of zebra fish; c is a mortality change chart of zebra fish; d is a zebra fish heart cell area chart; e is a graph of zebra fish arteria-venous sinus distance or atrioventricular distance.
FIG. 2 is a graph showing the effect of different concentrations of butyl paraben on the ability of a zebra fish embryo to contract heart in an example; wherein A is a cardiac schematic of zebra fish, and end systole and end diastole schematic; b ventricular area (size); c shortening the fraction; d, pumping blood fraction; e stroke volume.
FIG. 3 is a graph showing the effect of varying concentrations of butyl paraben exposure on blood supply to the heart of zebra fish and blood flow rate in an example embodiment; wherein A is a representative graph of cardiac blood cell number; b cardiac blood volume representative map; c, heart blood cell intensity statistical graph; d, a tail vein blood flow velocity statistical schematic diagram; e, a tail vein blood flow velocity statistical graph; f endocardial blood flow response gene kfl a transcript levels; e heart failure is well known to indicate transcript levels.
FIG. 4 is a graph showing the effect of varying concentrations of butyl paraben exposure on macrophages and neutrophils in zebra fish myocardial tissue in an example; wherein A is a representative graph of the number of macrophages in myocardial tissue; b myocardial tissue neutrophil count representation; c, counting the number of macrophages in myocardial tissue; d, counting a neutral grain number in myocardial tissue; e, representative graph of whole-body macrophage number of zebra fish; f, representative graph of whole body neutral particle number of zebra fish; g, a whole-body macrophage quantity statistical graph of zebra fish; h, counting the total neutral particle number of the zebra fish; i transcription level of inflammatory factors in heart region.
Detailed Description
The experimental methods in the following examples are conventional methods unless otherwise specified. The test materials used in the examples described below, unless otherwise specified, were purchased from commercial sources.
1. Experimental method
1. Normally farmed zebra fish are placed in mating cylinders in a ratio of 1:1 or 1:2 for male and female and separated by a spacer. The next morning, the barrier is removed and females begin to spawn. Embryos are collected within 30min after spawning, and the dead and unfertilized eggs, feces and other impurities are sucked out and washed 3 times with clear water. Then placed in an incubator at 28.5 ℃.
2. Zebra fish embryos with normal development of 5-6hpf are selected under a microscope, transferred into butyl p-hydroxybenzoate solutions (0.6 mg/L, 1.2mg/L, 1.8 mg/L) with different concentration gradients prepared by embryo culture water, and simultaneously a control group (the same volume of embryo culture water is used for incubation) is arranged and cultured in an incubator at 28-28.5 ℃ for changing liquid every 22-24 hours.
3. The transgenic Tg (myl 7:7 GFP) after treatment was observed for the cardiac development of zebra fish using a fluorescence microscope (Lycra M205 FA, germany). And meanwhile, video recording is further adopted, and images of the systole end and the diastole end are obtained through tracker software. The ventricular area (size), fractional shortening, fractional pumping, stroke volume (shown in fig. 2) were obtained with the short axis length a and the long axis length b, respectively.
Ventricular area = pi x ab/2;
ventricular volume = a2×b×0.523;
Fractional shortening= (end diastole area-end systole area)/end diastole area;
pump fraction = (end diastole volume-end systole volume)/end diastole volume;
Stroke volume = end diastole volume-end systole volume.
4. Hybridization of the zebra fish with Tg (myl: GFP) multiplied by Tg (gata 1: dsred), shooting by a fluorescence confocal microscope, and observing the number of red blood cells, the blood volume and the blood flow velocity of the zebra fish at the heart by combining o-dianisidine staining; and detecting endocardial blood flow response gene and natriuretic peptide and brain natriuretic peptide transcription level by qPCR.
5. The numbers of macrophages and neutral particles in the myocardial tissue of the hybridized zebra fish were observed by fluorescence confocal imaging for Tg (myl: GFP). Times.Tg (mpeg 1: mcherry), tg (myl: GFP). Times.Tg (lyz: dsred); and shooting the quantity conditions of whole-body macrophages and neutral grains of the transgenic zebra fish Tg (mfap 4:4) and Tg (lyz: dsred) by using a body fluorescence microscope; and detecting transcription level of the inflammatory factors related to the heart region by qPCR.
2. Experimental results
(A) Effect of different concentrations of butyl p-hydroxybenzoate solution on the ability of zebra fish to contract heart.
The results are shown in FIG. 1, and the initial phenotype pericardial edema, cardiac linearization, heart rate decline (A, B in FIG. 1) was observed after butyl parahydroxybenzoate treatment. And as the concentration of butyl parahydroxybenzoate and the treatment time increased, the survival rate, heart rate of zebra fish decreased (B, C in fig. 1), and the state of pericardial edema, heart linearization became more serious (A, D, E in fig. 1). Further video recordings were made of end systole and end diastole images by the tracker software as shown in fig. 2 (a in fig. 2), and statistics have found that butyl parahydroxybenzoate solutions resulted in significant decreases in zebra fish ventricular area (size) (B in fig. 2), fractional shortening (C in fig. 2), fractional pumping (D in fig. 2), and stroke volume (E in fig. 2) with increasing concentration. Wherein the fractional shortening and the fractional pumping are key indicators of the ability of the heart to contract, and insufficient ability of the heart to contract satisfies one of the key features of heart failure.
(B) Effects of different concentrations of butyl paraben solutions on blood supply capacity and blood flow rate of zebra fish heart.
As a result, as shown in FIG. 3, it was further found that the combination of fluorescence confocal and o-dianisidine staining resulted in a decrease in blood supply to the heart (decrease in blood flow to the heart) (A, B, C in FIG. 3). And was found to cause blood circulation disorders (decrease blood flow rate) (D, E in fig. 3). The decrease in cardiac blood flow was further confirmed by endocardial blood flow response gene detection (F in fig. 3). I.e. phenotypically fulfilling the key features that heart failure has. And by increasing the transcript levels of atrial natriuretic peptide (nppa), cerebral natriuretic peptide (nppb) (G in fig. 3), key molecular indicators leading to heart failure were validated.
(C) Butyl parahydroxybenzoate solutions resulted in macrophage defects and immune cell response defects at the zebra fish heart.
As shown in fig. 4, the cardiac region macrophages and neutrophils were recorded by fluorescence confocal (A, B in fig. 4) and found that the butyl p-hydroxybenzoate treated myocardial tissue and cardiac region did not recruit more macrophages and neutrophils (C, D in fig. 4) and resulted in a loss of the number of cardiac resident macrophages (B in fig. 4); and results in abnormal changes in macrophage morphology and size (arrow a in fig. 4). Imaging of whole-body macrophages and neutrophils of zebra fish by a whole-body fluorescence microscope revealed that butyl p-hydroxybenzoate did not significantly affect whole-body macrophage and neutrophil status (E, G, F, H in fig. 4); however, by QPCR on isolated hearts for detection of inflammatory factor transcript levels (I in fig. 4), significant inflammatory response was found in heart regions; the results indicate that butyl parahydroxybenzoate inhibits the recruitment of macrophages and neutrophils to myocardial tissue and cardiac regions and leads to defects in resident macrophages in the heart.

Claims (9)

1. The method for constructing the zebra fish immune non-responsive heart failure model is characterized by selecting 5-6 hpf normal-development zebra fish embryos, transferring the zebra fish embryos into zebra fish embryo culture solution added with 1.2-1.8mg/L butyl p-hydroxybenzoate, culturing at 28-28.5 ℃, changing the solution every 22-24 h, and culturing until the temperature reaches 3-3.5 dpf to obtain the zebra fish immune non-responsive heart failure model.
2. The construction method according to claim 1, wherein the addition amount of butyl parahydroxybenzoate is 1.8mg/L.
3. The method of claim 1, wherein 5 hpf normal-developing zebra fish embryos are selected.
4. The method according to claim 1, wherein the culturing temperature is 28.5 ℃.
5. The method of claim 1, wherein culturing to 3dpf results in a zebra fish immune non-responsive heart failure model.
6. The method of claim 1, wherein the liquid is changed every 24 hours.
7. The method of claim 1, wherein the zebra fish is a transgenic tagged line.
8. The construction method according to claim 7, wherein the transgenic marker line is one or more of Tg (myl: GFP), tg (myl: GFP) x Tg (gata 1: dsred), tg (myl: GFP) x Tg (mpeg 1: mcherry) or Tg (myl: GFP) x Tg (lyz: dsred).
9. A method of assessing a model of zebra fish immune non-responsive heart failure as claimed in any one of claims 1-8, comprising one or more of the following (a) - (c):
(a) Observing the heart development condition of the transgenic Tg (myl 7:GFP) zebra fish model by using a fluorescence microscope, and obtaining images of the end systole and the end diastole of the heart by using video recording and tracker software;
(b) Observing the quantity, blood volume and blood flow velocity of red blood cells at the heart of the hybridized zebra fish model by fluorescence confocal, integral fluorescence microscopy shooting and combining o-dianisidine staining to observe Tg (myl 7:GFP) x Tg (gata 1: dsred); detecting endocardial blood flow reaction genes and the transcription level of the natriuretic peptide and the brain natriuretic peptide by qPCR;
(c) The numbers of macrophages and neutral particles in myocardial tissue of the hybridized zebra fish model were observed by fluorescence confocal imaging for Tg (myl: GFP). Times.Tg (mpeg 1: mcherry), tg (myl: GFP). Times.Tg (lyz: dsred); shooting the quantity conditions of whole macrophages and neutral grains of the transgenic zebra fish model with a split fluorescent microscope according to Tg (mfap 4:GFP) and Tg (lyz: dsred); and detecting transcription level of the inflammatory factors related to the heart region by qPCR.
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