the details of this invention are described as following through combination of the embodiments and figures . the normal mice were purchased from shanghai research center for model organisms . all the reagents and raw materials can be obtained through purchase from companies or preparation with the methods reported . in the following experiments , the processes without specific instructions were carried out routinely or according to the manufactory &# 39 ; s instruction . a plasmid containing fabp4 - metrnl was constructed with the promoter region of fabp4 and open reading frame of metrnl . after the verification with sequencing and linearization with restriction enzyme cutting , this plasmid was injected into fertilized eggs which were transplanted into the uterus of pseudopregnant mice . after genomic identification of the offspring , the mice carrying the fabp4 - metrnl in genome were chosen to mate with c57bl / 6 mice . the next - generation mice carrying the fabp4 - metrnl in genome were selected into experimental group , and the mice without fabp4 - metrnl in genome were selected into control group . plasmid containing fabp4 - metrnl can also be produced using purchased commodities , for example , open reading frame of metrnl can be purchased from thermo ( lot . mmm1013 - 202763251 ), and the promoter region of fabp4 can be obtained from addgene ( no . 11424 ). the metrnl adipose - specific overexpression mice can also produced through entrusting shanghai research center for model organisms . metrnl overexpression can prevent the increase of blood glucose induced by intraperitoneal injection of glucose mice aged 22 weeks have been fed for 16 weeks with high fat diet ( research diets , lot . d12492 ). both control wild type and metrnl adipose - specific overexpression mice were administrated with the same dose of glucose via intraperitoneal injection . follows are the details . mice aged 22 weeks fasted for 8 hours , and were intraperitoneally injected with glucose at a dose of 1 g / kg . then , blood glucose was detected at different time points ( table 1 ) with a one touch ultra glucometer ( johnson & amp ; johnson ) via tail vein bleeding . the results showed that the blood glucose was dramatically lower in metrnl adipose - specific overexpression mice than that in control wild type mice ( table 1 and fig1 ). 12 - week - old mice fasted for 3 hours , and were administrated with fat emulsion ( lipofundin , b . braun melsungen ) at a dose of 10 μl / g . blood samples were obtained from the tail vein at different time points . and 10 μl serum was used to detect the concentration of triglyceride with triglyceride colorimetric assay kit ( e1003 , applygen technologies inc .) the results showed that the blood triglyceride was significantly lower in metrnl adipose - specific overexpression mice than that in control wild type mice ( table 2 and fig2 ). the present invention is not intended to limit to embodiments thereof . further , it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims .
the present invention provides an application of metrnl protein in preparing a hypolipidemic , hypoglycemic medicine or dietary supplement . the present invention further provides a method for preparing a mouse with fat - specific overexpression of metrnl .