WO2019119307A1

WO2019119307A1 - Cmklr1 antagonist polypeptide, and derivative and application thereof

Info

Publication number: WO2019119307A1
Application number: PCT/CN2017/117520
Authority: WO
Inventors: 张键; 代小勇; 陈杰; 黄晨; 余贵媛; 薛丽
Original assignee: 深圳先进技术研究院
Priority date: 2017-12-20
Filing date: 2017-12-20
Publication date: 2019-06-27

Abstract

A CMKLR1 antagonist polypeptide, and derivative and application thereof, in particular relating to sequence SEQ ID No.1-15 and derivative thereof. The derivative of the binding peptide is a product obtained by conventionally modifying an amino terminal or a carboxyl terminal of a CMKLR1 antagonist polypeptide fragment on an amino acid side-chain group of a CMKLR1 binding peptide, or a product obtained by linking a tag for polypeptide or protein detection or purification on the CMKLR1 antagonist polypeptide. The binding peptide and derivative thereof can bind CMKLR1 in vitro, and can, by blocking the binding between chemerin/RvE1 and CMKLR1, change the concentration of cAMP and inhibit calcium influx and cell chemotaxis which are caused by chemerin; in addition, the binding peptide and derivative thereof can inhibit ovarian cancer cell proliferation, facilitate apoptosis of ovarian cancer cells, and provide small molecule drugs for effectively treating female reproductive diseases.

Description

CMKLR1 antagonist polypeptide and its derivative and application

Technical field

The present invention relates to the field of biotechnology and biomedicine, and in particular, the present invention is a target of female reproductive disease CMKLR1 receptor antagonist polypeptide LRH7-C3 and its derivatives and applications.

Background technique

Among female reproductive cancers, some are associated with endocrine. For example, breast cancer, endometrial cancer and Ovarian Cancer (OAC). Among them, ovarian cancer is a malignant tumor that occurs in the ovary, 90% to 95% of which are primary ovarian cancers, and 5% to 10% of the primary cancers in other parts are transferred to the ovaries. Although the incidence of ovarian cancer in China is not as high as in Europe and the United States, eradication surgery and cytotoxic chemotherapy lack the effectiveness of effectively reducing ovarian cancer mortality. Because of the early absence of symptoms in ovarian cancer, even if symptoms are not specific, the role of screening is limited, so early diagnosis is difficult, 60% to 70% of patients have advanced in the treatment, and advanced cases are not effective. Therefore, although the incidence of ovarian cancer is second only to cervical cancer and endometrial cancer, the third place in gynecological malignancies, but the mortality rate is more than the sum of cervical cancer and endometrial cancer, the highest in gynecological cancer, is serious The biggest threat to women's health.

In previous clinical studies, ovarian cancer was found to have no obvious symptoms at an early stage. However, some studies have shown that ovarian cancer may show some clinical symptoms in the early stage, such as abnormal bloating, fullness, abdominal pain or back pain, lack of energy, etc., but these symptoms are often ignored by patients, often when diagnosed Metastasis has occurred, and ovarian cancer is often described as a "silent killer", which in turn leads to a poor prognosis for ovarian cancer.

A large number of studies have shown that ovarian cancer is often spread to distant organs by direct spread and basin and abdominal cavity. The main route of ovarian cancer metastasis is intra-abdominal implantable metastasis. According to clinical observation, the main part of metastasis is the omentum, and 80% of women with ovarian cancer have retinal metastasis. At this time, the cancer cells on the greater omentum grow at a much faster rate than the original lesion. The omentum is a peritoneum that connects the stomach to the transverse colon. It contains phagocytic cells and has important defense functions. It is also an adipose tissue containing a large number of lipid droplets. It is an important endocrine organ in the body and participates in the homeostasis of the body. Although the fact that ovarian cancer metastasizes to the greater omentum is obvious, its mechanism has not been clarified. Because the adipose tissue is mainly adipose tissue, adipose tissue is the largest endocrine organ in the body, which can secrete adipokines, cytokines, etc. The relationship between fat cells and ovarian cancer cells in adipose tissue and its mechanism still need more More evidence is stated.

With the deepening of research on cancer, there is growing evidence that obesity increases the risk of death in cancer patients. For example, leptin secreted by white adipose tissue promotes the development of breast cancer: on the one hand, leptin can promote the growth of breast cancer by activating JAK/STAT3, MAPK-ERK1/2 or PI3K pathways; Can also promote tumor-associated angiogenesis by inducing expression of angiopoietin, and leptin can also induce transcription of human epidermal growth factor receptor 2 (ErbB-2) and participate in insulin-like growth in triple-negative breast cancer cells. The reaction of body 1 (IGF-1) activates the epidermal growth factor receptor (EGFR) to promote cell invasion and metastasis. The current study also shows that leptin can also promote the development of various cancers such as prostate cancer and thyroid cancer, and its expression level is positively correlated with tumorigenesis, but the level of leptin in pancreatic cancer is relatively low, and both. The relationship is not very clear. Studies have also found that adiponectin has an inhibitory effect on the development of tumors.

It has been reported that obesity can also increase the risk of ovarian cancer in women. Adipose tissue affects ovarian cancer in obese women. The researchers studied 216 women, 35 of whom were obese women and 108 were normal-weight women. They were found in ovarian cancer patients compared with women of normal weight. Obese women have lower survival rates and shorter survival times. Scientists have found that in addition to their cancer death rate and cancer recurrence rate, their tumor cells also behave differently, suggesting that hormones or proteins secreted by adipose tissue may cause ovarian cancer cells to proliferate rapidly. Studies have also shown that IL-6 and IL-8 secreted by the adipocytes of the omentum in the peritoneal cavity can promote the transfer of ovarian cancer cells to it.

Regarding the relationship between adipose tissue, especially omental fat, and ovarian cancer, an article published by Professor Ernst Lengyel in the October 30, 2011 issue of Nature Medicine provides detailed evidence. Chemerin is a newly discovered adipocytokine, also known as chemerin, which plays a role in immune response, inflammatory response, adipocyte differentiation maturation, lipid metabolism, etc., and is associated with obesity and metabolic syndrome. The chemerin gene, also known as Tazarotene Induced Gene 2 (TIG2), was first cloned in 1997. Subsequently, in 2003, Wittamer et al. passed reverse-phase high-pressure liquid chromatography in ascites secondary to ovarian cancer. The active protein is isolated.

In 2012, studies by Revechon et al. confirmed that chemerin and its receptor CMKLR1 (chemokine receptor-1) are expressed in major human ovarian granulosa cells (hGCs) and human ovarian granulosa-like tumor cells (KGN), again The relationship between chemerin and ovarian tumors.

In October 2011, Dr. Ernst Lengyel published a study in nature medicine that found that ovarian cancer plays a crucial role in the process of metastasis to the greater omentum, and that the chemokines of the greater omentum are involved in the migration of ovarian cancer. The process of omental fat, and the chemokine adiponectin and cytokines IL-6, IL-8 in omental fat cells were detected. However, there is no record in the article that chemerin, which is also a chemokine, is detected.

Fatty factor Chemerin

The adipokines Chemerin is also known as tazarotene-inducible gene 2 (TIG2) or retinol receptor-reactive protein 2. After being discovered by Nagpal and other clones in 1997, in 2003, Wittamer et al. isolated active proteins in reverse blood from ovarian cancer by reversed-phase high pressure liquid chromatography. The Chemerin protein precursor is 163 amino acids in length, has 6 cysteine residues, forms 3 disulfide bonds, removes the N-terminal signal peptide and several amino acids at the C-terminus, and has biological activity, and chemerin activation in the blood. The form contains 134 amino acids (about 16 kDa) and is structurally a family of bactericidal peptides/cysteine protease inhibitors. When an inflammatory reaction occurs, chemerin can be rapidly converted into an activated form by several proteases. Chemerin is widely expressed in various tissues of human body, mainly expressed in white adipose tissue, placenta and liver, and is combined with three receptors: 1G protein-coupled receptor CMKLR1; 2G protein-coupled receptor GPR1; 3CCRL-2. CMKLR1 is highly expressed in macrophages, immature dendritic cells and white adipose tissue, and is the main receptor for Chemerin to play biological functions. Chemerin can chemotactically express CMKLR1 dendritic cells and macrophages, in immunity and adaptation. Sexual immunity plays a role as a bridge between immune response, inflammatory response, adipocyte differentiation and maturation, lipid metabolism, etc., and is associated with obesity and metabolic syndrome. When Chemerin binds to CMKLR1, it releases calcium ions in CMKLR1-positive cells, inhibits aggregation of cAMP, and phosphorylates MAP kinase. Pretreatment with pertussis toxin can block intracellular signal transduction of CMKLR1, and intracellular signal transduction of CMKLR1 may be related to Gi family. Chemerin acts as a chemokine, chemotaxis of dendritic cells and macrophages, and acts as a bridge between immune and adaptive immunity. Chemotactic natural killer cells reach the site of inflammation to participate in inflammatory reactions; on the other hand, as new fats The factor, produced by adipose tissue secretion, regulates the differentiation and lipolysis of fat cells, and promotes biological effects such as insulin signaling pathways in adipocytes. Chemerin plays an important role in the pathophysiological mechanisms of obesity and metabolic syndrome.

Reducing E1 (resolvin E1)

In 2002, American scholar SerhanCN and other studies showed that EPA and aspirin treatment can reduce the number of 25%-60% neutrophils in inflammatory exudates of acute inflammation models in mice. They use liquid chromatography-tandem mass spectrometry (LC-MS/ MS) Analysis of inflammatory exudates revealed novel trihydroxy-containing compounds (5, 12, 18-tri HEPE) and the production of monohydroxy fatty acids, 18-hydroxy-EPA (18-HEPE) and 5-HEPE from EPA. When administered intravenously (100 ng/mouse), this new trihydroxy-EPA is a potent inhibitor of neutrophil infiltration. It has the property of reducing inflammation and is named RvE1. Based on the physical and biological properties of the synthetic compounds, RvE1 was identified as 5S, 12R, 18R-hydroxy-6Z, 8E, 10E, 14Z, 16E-eicosapentaenoic. The vasopressin compounds (Rvs) are a group produced by epoxidation of EPA or DHA in vascular endothelial cells. According to the different substrates required, it can be divided into D, E and other types, each type is divided into several categories. RvE1 belongs to the E-group Rvs, and Resolvin E1 is another lipid ligand of CMKLR1, which can reduce the inflammatory response, reduce the migration of dendritic cells and reduce the production of interleukin 12 by binding to CMKLR1 and the leukotriene B4 receptor BLT1. RvE1 can be synthesized by an aspirin-dependent pathway and a non-dependent aspirin pathway.

RvE1 should be stimulated to produce a local action and rapidly metabolize further by enzymes. In mammalian tissues, there are at least four separate pathways of RvE1 metabolism. RvE1 has a strong anti-inflammatory effect, which can alleviate leukocyte-mediated tissue damage and down-regulate inflammatory gene overexpression. RvE1 is an important regulator of neutrophils. In an inflammatory model, including yeast-induced peritonitis and 2,4,6-trinitrobenzene-induced colitis, a nanogram dose of RvE1 can significantly reduce neutrophil infiltration at the site of inflammation. In CMKLR1 transfected cells, RvE1 interacts with CMKLR1 to inhibit tumor necrosis factor-α-induced NF-κB activation. In vivo RvE1 blocks DC migration and IL-12 production. At the same time, RvE1 can effectively inhibit lipopolysaccharide (LPS)-stimulated release of TNF-α, IL-6 and IL-23 from bone marrow-derived dendritic cells (BMDCs). RvE1 blocks excessive platelet aggregation under pathological conditions, but does not interfere with collagen-induced physiological coagulation. RvE1 induces L-selectin shedding and down-regulates the expression of human granulocyte and monocyte surface molecule CD18. In addition, in mice, RvE1 rapidly reduces the rolling of leukocyte testicular venous epithelial cells. RvE1 selectively induces the expression of the anti-adhesion molecule CD55 in epithelial cells, thereby promoting neutrophil clearance dependent on epithelial cell surface CD55. It can prevent inflammatory cells from trans-epithelial and transendothelial migration; promote phagocytosis of apoptotic neutrophils by macrophages; down-regulate the secretion of interleukin-12 from dendritic cells; up-regulate the expression of CCR5 in T cells; regulate the expression of leukocyte adhesion molecules Reduce leukocyte rolling; selectively block adenosine and thromboxane receptor agonist U46619 to promote platelet aggregation. It has exhibited good preventive and therapeutic effects in various disease models such as rabbit periodontitis, mouse peritonitis, mouse retinopathy, and colitis.

CMKLR1 receptor

CMKLR1, also known as ChemR23. In 2003, Meder et al. demonstrated that Chemerin is a natural ligand for CMKLR1 by reverse pharmacology. The human CMKLR1 gene is located at 23.3 of the upper arm of chromosome 12 and consists of three exons and two introns. High expression in the acquired immune system, in which high expression was detected in macrophages, immature DCs, monocytes, neutrophils, and natural killer cells, but expression in mature DCs was decreased; Addition of miniplate cells, adipocytes, endothelial cells, oral epithelial cells, osteoclasts, vascular smooth muscle cells, myocytes, and sacral glioma cells (DBTRG-05MG) also expressed CMKLR1. Chemerin/RvE1 binds to CMKLR1 and activates endocytosis, which promotes the release of intracellular calcium (Ca ²⁺ ) ions, phosphorylates extracellular signal-regulated kinase 1/2 (ERK1/2), and binds to G-protein coupled Source trimers to inhibit the accumulation of cyclic adenosine monophosphate (cAMP); up-regulate the PI3K/Akt signaling pathway, down-regulate nuclear factor kappa B (NFκB) signaling pathway: recruit immature dendritic cells and macrophages to the site of inflammation, thereby Achieve regulation of various metabolic processes, inflammatory responses and cancer.

More and more studies have shown that the signal abnormality of Chemerin and its receptor is closely related to the occurrence and development of cancer. Chemerin can induce endothelial cell proliferation and neovascular plexus formation after binding to CMKLR1 receptor on endothelial cell membrane. It promotes the growth and proliferation of tumor cells. The expression level of Chemerin in most tumors is very low, and some are not even detected, but in the paracancerous tissues, and in the distal normal tissues, Chemerin expression levels are higher, such as: colon cancer, lung cancer (including non- Small cell lung cancer), liver cancer, melanoma, gastric cancer and ovarian cancer. Yu et al found that Chemerin up-regulates VEGF, MMP-7 and IL-6 protein levels in gastric cancer by activating p38 and ERK1/2 signaling pathways, and promoting tumor invasion and migration. In 2012, studies by Revechon et al. confirmed that Chemerin and CMKLR1 are expressed in major human ovarian granulosa cells (hGCs) and human ovarian granular tumor cells (KGN). In October 2011, Dr. Ernst Lengyel published a study in nature medicine that found that ovarian cancer plays a crucial role in the process of metastasis to the greater omentum, and that the chemokines of the greater omentum are involved in the migration of ovarian cancer. The process of omental fat, and the detection of chemokines adiponectin and cytokines IL-6, IL-8 in omental adipocytes, once again suggest that chemerin in adipose tissue may be involved in ovarian cancer cell migration .

G-protein coupled receptor superfamilies (GPCRs) play an important role in extracellular signaling to intracellular transduction, regulating cell movement, growth, and gene transcription—a critical factor in these three cancer biology . In the past decade or so, the mediated signaling pathway has been shown to be a key regulator of protooncogene signaling and is a good drug target. Currently, 60% of the drugs sold on the market are designed for this receptor. . While CMKLR1 is a member of GPCRs, there is still no drug that directly targets CMKLR1 for the treatment of clinical cancer. Therefore, targeting CMKLR1, screening novel anti-cancer peptide drugs and humanized antibodies has important social significance and broad economic market.

Phage Display Technology is a specific polypeptide or protein screening technology. The technology can display the polypeptide encoded by the target gene as a fusion protein on the surface of the phage. The displayed polypeptide or protein can remain relatively independent. Spatial structure and biological activity, which establish a direct link between a large number of random polypeptides and their DNA coding sequences, enabling peptide ligands of various target molecules (such as antibodies, enzymes and cell surface receptors) to be obtained by in vitro affinity panning procedures. Quick identification. Phage display technology has been widely used in the screening of tumor diagnostic markers and anti-tumor lead compounds, tumor-specific antibodies and targeted drug delivery of tumor drugs.

Summary of the invention

In order to overcome the deficiencies and shortcomings of the prior art, the primary object of the present invention is to provide a CMKLR1 antagonist polypeptide which is screened by a phage display library, which has a specific high affinity with the Chemerin/RvE1 receptor CMKLR1 and can inhibit Chemerin. /RvE1 binds to CMKLR1 to block the signaling pathway of Chemerin/RvE1-CMKLR1, demonstrating that this peptide plays an important role in targeting ovarian cancer cell proliferation and promoting ovarian cancer cell apoptosis. The treatment has great application value.

Another object of the present invention is to provide a derivative of the above CMKLR1 receptor antagonist polypeptide which is also capable of having a specific high affinity with the CMKLR1 receptor and which specifically competes with the binding site of Chemerin/RvE1 and CMKLR1, and is capable of inhibiting Chemerin /RvE1 combines with CMKLR1.

A further object of the present invention is to provide the use of the above CMKLR1 antagonist polypeptide and derivatives thereof.

In order to achieve the above tasks, the present invention adopts the following technical solutions:

One aspect of the present invention provides a CMKLR1 antagonist polypeptide, which has the amino acid sequence of: Tyr-(D)Asp-Gly-Gln-Trp-Arg-Leu-NH ₂ (SEQ ID No. 1), that is, LRH7 -C3.

The screening method of the above CMKLR1 antagonist polypeptide adopts a phage random peptide library, firstly transfects 293T cells with CMKLR1 plasmid to obtain a stable cell line with permanent high expression of CMKLR1, and adsorbs cells with wild type 293T cells as control, and performs 5 rounds of whole cells. The screening was reduced, 50 positive phage amplifications were randomly picked, and cloned single-stranded DNA sequencing was performed. The basic characteristics of the amino acid sequence of the polypeptide are analyzed, the homology of the polypeptide is compared, and the polypeptide motif with high frequency of occurrence is searched. BLAST searches a protein database to detect proteins with high homology of polypeptide motifs, and discovers biological species containing a large amount of the polypeptide, and possibly cell surface receptors and ligands, which facilitate subsequent large-scale extraction and purification of polypeptides.

Hydrophilic analysis indicated that LRH7-C3 is a hydrophilic polypeptide;

The purity of LRH7-C3 synthesized by high performance liquid chromatography (HPLC) and mass spectrometry (MS) was 99.85%.

Another aspect of the present invention provides a product of the CMKLR1 antagonist polypeptide of the present invention which is obtained by conventionally modifying the amino terminus or the carboxy terminus of the CMKLR1 antagonist polypeptide fragment on the amino acid side chain group of the CMKLR1 antagonist polypeptide, or CMKLR1 antagonist a product obtained by attaching a tag for detection or purification of a polypeptide or protein to a polypeptide;

Preferably, the conventional modification is amination, amidation, hydroxylation, carboxylation, carbonylation, alkylation, acetylation, phosphorylation, sulfation, esterification, glycosylation, cyclization, biotinylation , fluorophore modification, polyethylene glycol PEG modification or immobilization modification;

Preferably, the tag is His6, GST, EGFP, MBP, Nus, HA, IgG, FLAG, c-Myc or ProfinityeXact.

In a further aspect of the invention there is provided a biologically active fragment or analog of a CMKLR1 antagonist polypeptide of the invention, as set forth in SEQ ID No. 2-15:

YX ₁ GX ₂ WRX ₃ SEQ ID No. 2, where:

( ₁ ) X ₁ is glutamic acid (E);

( ₂ ) X ₂ is glutamic acid (E);

( ₃ ) X ₃ is methionine (M).

YX ₄ GX ₅ WR SEQ ID No. 3, where:

(1) X ₄ is asparagine or glutamic acid (N, E);

(2) X ₅ is glutamic acid (E).

YX ₆ GX ₇ W SEQ ID No. 4, where:

(1) X ₆ is glutamic acid (E);

(2) X ₇ is glutamic acid (E).

GX ₈ WRL SEQ ID No. 5, where:

(1) X ₈ is histidine (H).

The invention also provides a derivative of a biologically active fragment or analog of a CMKLR1 antagonist polypeptide, wherein the amino acid side chain group, the amino terminus or the carboxy terminus of the derivative of the biologically active fragment or analog of the CMKLR1 antagonist polypeptide is conventionally modified. The resulting product, or a biologically active fragment or analog of a CMKLR1 antagonist polypeptide, is ligated to a product obtained for labeling or purification of a polypeptide or protein;

In the technical solution of the present invention, the CMKLR1 antagonist polypeptide and the derivative thereof can be applied to the preparation of a medicament for preventing and/or treating female reproductive diseases, and the present invention has the following forms: 1 contains 4 amino acids; 2 consists of 5 amino acids Composition; 3 consists of 6 amino acids; 4 consists of 7 amino acids. The derivative of the CMKLR1 antagonist polypeptide is a product obtained by conventional modification of the amino acid side chain group of the CMKLR1 antagonist polypeptide, the amino terminus or the carboxy terminus of the CMKLR1 antagonist polypeptide fragment, or the CMKLR1 antagonist polypeptide is ligated for polypeptide or protein detection. Or a purified tag resulting in a product; the conventional modification is preferably amination, amidation, hydroxylation, carboxylation, carbonylation, alkylation, acetylation, phosphorylation, esterification, glycosylation, cyclization , biotinylation, fluorophore modification, polyethylene glycol PEG modification or immobilization modification, etc.; the label is preferably His ₆ , GST, EGFP, MBP, Nus, HA, IgG, FLAG, c-Myc or Profinitye Xact et al;

The CMKLR1 antagonist polypeptide and its derivatives may be derived from bacteria, fungi or viruses, as well as mammals or birds, such as primates (humans); rodents, including mice, rats, hamsters, rabbits , horses, cows, dogs, cats, snakes, etc.

Preferably, the derivative of the CMKLR1 antagonist polypeptide is: the second amino acid residue of the above CMKLR1 antagonist polypeptide is D-configuration aspartic acid, and the terminal is amidated, that is, Tyr-(D)Asp-Gly-Gln- Trp-Arg-Leu-NH ₂ .

The obtaining of the CMKLR1 antagonist polypeptide and the derivative thereof is carried out by a known method in the prior art, and can be chemically synthesized by an automatic peptide synthesizer; the nucleotide sequence is deduced from the short peptide sequence, and then cloned into a vector. Biosynthesis is carried out; it can also be extracted and purified in large quantities from existing organisms.

Specifically, the CMKLR1 antagonist polypeptide LRH7-C3 and its derivatives have the following sequences:

1. YX ₁ GX ₂ WRX ₃ (SEQ ID No. 2), where:

( ₁ ) X ₁ is glutamic acid (E);

( ₂ ) X ₂ is glutamic acid (E);

( ₃ ) X ₃ is methionine (M).

2. YX ₄ GX ₅ WR (SEQ ID No. 3), where:

(1) X ₄ is asparagine, glutamic acid (N, E);

(2) X ₅ is glutamic acid (E).

3. YX ₆ GX ₇ W (SEQ ID No. 4), where:

(1) X ₆ is glutamic acid (E);

(2) X ₇ is glutamic acid (E).

4. GX ₈ WRL (SEQ ID No. 5), where:

(1) X ₈ is histidine (H).

In addition, the CMKLR1 antagonist polypeptide LRH7-C3 and its derivatives also include the following polypeptides naturally present in the organism:

A further aspect of the invention provides a polynucleotide encoding the polypeptide of any one of SEQ ID No. 1-15.

In a further aspect of the invention there is provided a vector comprising a nucleotide of the invention which can be linked to a promoter sequence by genetic means.

In a further aspect of the invention there is provided a host cell transfected with a vector of the invention.

According to still another aspect of the present invention, a CMKLR1 antagonist polypeptide, a derivative of a CMKLR1 antagonist polypeptide, a biologically active fragment or the like of a CMKLR1 antagonist polypeptide, and a derivative thereof are provided for the preparation of a medicament for treating a chemerin/RvE1-CMKLR1 mediated disease. Use in.

According to still another aspect of the present invention, there is provided a CMKLR1 antagonist polypeptide, a derivative of a CMKLR1 antagonist polypeptide, a biologically active fragment or analog of a CMKLR1 antagonist polypeptide, and a derivative thereof, for use in treating a chemerin/RvE1-CMKLR1 mediated disease. .

In the technical solution of the present invention, the chemerin/RvE1-CMKLR1 mediated disease is selected from the group consisting of ovarian cancer, polycystic ovary syndrome, fatty liver, diabetes, and inflammatory response.

According to still another aspect of the present invention, a CMKLR1 antagonist polypeptide, a derivative of a CMKLR1 antagonist polypeptide, a biologically active fragment or analog of the CMKLR1 antagonist polypeptide, and a derivative thereof according to the present invention are provided in the preparation of a medicament for inhibiting a decrease in cAMP concentration caused by chemerin. the use of.

In a further aspect of the invention, the use of a CMKLR1 antagonist polypeptide, a derivative of a CMKLR1 antagonist polypeptide, a biologically active fragment or analog of a CMKLR1 antagonist polypeptide, and a derivative thereof, for inhibiting a decrease in cAMP concentration by chemerin is provided.

According to still another aspect of the present invention, the CMKLR1 antagonist polypeptide, the derivative of the CMKLR1 antagonist polypeptide, the biologically active fragment or the like of the CMKLR1 antagonist polypeptide and the derivative thereof are provided in the preparation of calcium (Ca ²⁺ ) induced by inhibition of chemerin. Use in flow-acting drugs.

According to still another aspect of the present invention, a CMKLR1 antagonist polypeptide, a derivative of a CMKLR1 antagonist polypeptide, a biologically active fragment or the like of the CMKLR1 antagonist polypeptide, and a derivative thereof are provided for inhibiting chemerin-induced calcium (Ca ²⁺ ) influx. Use in action.

According to still another aspect of the present invention, a CMKLR1 antagonist polypeptide, a derivative of a CMKLR1 antagonist polypeptide, a biologically active fragment or the like of a CMKLR1 antagonist polypeptide, and a derivative thereof are provided in the preparation of a medicament for inhibiting chemotaxis caused by chemerin. the use of.

In a further aspect of the invention, the use of a CMKLR1 antagonist polypeptide, a derivative of a CMKLR1 antagonist polypeptide, a biologically active fragment or analog of a CMKLR1 antagonist polypeptide, and a derivative thereof, for inhibiting chemerin-induced cell chemotaxis is provided.

According to still another aspect of the present invention, a CMKLR1 antagonist polypeptide, a derivative of a CMKLR1 antagonist polypeptide, a biologically active fragment or analog of the CMKLR1 antagonist polypeptide, and a derivative thereof are provided for treating ovarian cancer, polycystic ovary syndrome, and fat. Use in drugs for liver, diabetes, and inflammatory reactions.

According to still another aspect of the present invention, a CMKLR1 antagonist polypeptide, a derivative of a CMKLR1 antagonist polypeptide, a biological active fragment or the like of the CMKLR1 antagonist polypeptide, and a derivative thereof are provided for treating ovarian cancer, polycystic ovary syndrome, and fatty liver. , diabetes, and the use of inflammatory reactions.

According to still another aspect of the present invention, a pharmaceutical composition comprising the CMKLR1 antagonist polypeptide of the present invention, a derivative of a CMKLR1 antagonist polypeptide, a biologically active fragment or analog of a CMKLR1 antagonist polypeptide, and a derivative thereof, or A variety of as an active ingredient.

The pharmaceutical composition may contain one or a plurality of pharmaceutically acceptable carriers;

The pharmaceutically acceptable carrier is preferably a diluent, an excipient, a filler, a binder, a wetting agent, a disintegrant, an absorption enhancer, an adsorption carrier, a surfactant or a lubricant;

The pharmaceutical composition may be further prepared into various forms such as tablets, granules, capsules, oral liquids or injections, and the medicaments of various dosage forms may be prepared according to conventional methods in the pharmaceutical field;

A medicament for preventing and/or treating female reproductive diseases, comprising at least one of the above-mentioned CMKLR1 antagonist polypeptide and a derivative of CMKLR1 antagonist polypeptide (SEQ ID No. 1 to 15);

In a specific experiment of the present invention, the present invention utilizes the obtained CMKLR1 antagonist polypeptide LRH7-C3 to effectively change the inhibitory effect of chemerin/RvE1 on cAMP signaling pathway. Among them, the CMKLR1 antagonist polypeptide LRH7-C3 derivatives (SEQ ID No. 1 to 15) have the same effects.

In another specific experiment of the present invention, the CMKLR1 antagonist polypeptide LRH7-C3 can effectively inhibit the chelation of calcium (Ca ²⁺ ) induced by chemerin. Among them, the CMKLR1 antagonist polypeptide LRH7-C3 derivatives (SEQ ID No. 1 to 15) have the same effects.

In addition, chemerin can act by chemotaxis of cells by binding to the CMKLR1 receptor. In another specific experiment of the present invention, the inventors used the Transwell assay to find that the CMKLR1 antagonist polypeptide LRH7-C3 significantly inhibits cell migration induced by chemerin. Among them, the CMKLR1 antagonist polypeptide LRH7-C3 derivatives (SEQ ID No. 1 to 15) have the same effects.

In a further experiment, the inventors verified the function of the CMKLR1 antagonist polypeptide LRH7-C3 by using ovarian cancer cell SKOV-3, which highly expresses CMKLR1, as a cell model. Compared with the control group, it was found that LRH7-C3 can significantly inhibit ovarian cancer cell SKOV- 3 proliferation. Among them, the CMKLR1 antagonist polypeptide LRH7-C3 derivatives (SEQ ID No. 1 to 15) have the same effects.

In another specific experiment of the present invention, the inventors used flow cytometry to detect that the CMKLR1 antagonist polypeptide LRH7-C3 can block the SKOV-3 cycle of ovarian cancer cells and promote the apoptosis of SKOV-3. Among them, the CMKLR1 antagonist polypeptide LRH7-C3 derivatives (SEQ ID No. 1 to 15) have the same effects.

The present invention has the following advantages and effects over the prior art:

(1) The present invention provides a CMKLR1 antagonist polypeptide LRH7-C3 and a derivative thereof (SEQ ID No. 1 to 15), which are capable of specifically binding to CMKLR1 and specifically competing The Chemerin/RvE1 binding site to CMKLR1 inhibits the Chemerin/RvE1-CMKLR1 signaling pathway.

(2) The CMKLR1 antagonist polypeptide and its derivative (SEQ ID No. 1-15) screened by the present invention can inhibit the proliferation of breast cancer cells and promote the apoptosis of breast cancer cells by blocking the binding of Chemerin/RvE1-CMKLR1. A biological polypeptide drug which can be used as a Chemerin/RvE1-CMKLR1 binding site, and can be used for the preparation of a medicament for preventing and/or treating female reproductive diseases, such as ovarian cancer, polycystic ovary syndrome, fatty liver, diabetes, and inflammatory reaction. It can be widely used in the fields of medicine and biology, and it has enormous social and economic benefits.

DRAWINGS

Figure 1: LRH7-C3 high performance liquid chromatography (HPLC) detection chart.

Figure 2: LRH7-C3 mass spectrometry (MS) detection plot.

Figure 3: Comparative analysis of hydrophobic profiles of CMKLR1, chemerin, RvE1 and LRH7-C3 polypeptides. Wherein: A: CMKLR1 hydrophobic profile; B: chemerin hydrophobic profile; C: RvE1 hydrophobic profile; D: LRH7-C3 polypeptide hydrophobic profile; E: CMKLR1, chemerin, RvE1 and LRH7-C3 polypeptide hydrophobic profile comparison. CMKLR1 has a blue outline, chemerin has a green outline, RvE1 has a red outline, and LRH7-C3 has a purple outline.

Figure 4: LRH7-C3 alters the inhibitory effect of chemerin on the cAMP signaling pathway.

Figure 5: LRH7-C3 inhibits the influx of calcium (Ca ²⁺ ) induced by chemerin.

Figure 6: LRH7-C3 inhibits cell chemotaxis by chemerin.

Figure 7: LRH7-C3 inhibits the proliferation of ovarian cancer cell SKOV-3.

Figure 8: LRH7-C3 blocks the cell cycle progression of ovarian cancer cell SKOV-3. A: flow cytometry to detect cell cycle; B: cell cycle data statistics.

Figure 9: LRH7-C3 promotes apoptosis of ovarian cancer cell line SKOV-3. A: Flow cytometry detects apoptosis; B: Apoptosis data statistics.

Detailed ways

In order to more clearly understand the present invention, the present invention will be further described with reference to the following examples and the accompanying drawings. The examples are for illustrative purposes only and are not intended to limit the invention in any way. In the examples, each of the original reagent materials is commercially available, and the experimental methods not specifying the specific conditions are conventional methods and conventional conditions well known in the art, or in accordance with the conditions recommended by the instrument manufacturer.

Example 1: Panning, amplification, purification, sequencing and synthesis of CMKLR1 antagonist polypeptide LRH7-C3.

This example is mainly for screening for positive phage which specifically binds to CMKLR1, and then by amplifying and purifying the positive phage, extracting phage single-stranded DNA (ssDNA) for sequencing, comparing the obtained sequence analysis, and finally synthesizing high purity. Antagonistic polypeptide LRH7-C3.

details as follows:

1. Establish a 293T cell line that permanently expresses CMKLR1: 293T-CMKLR1 ^+/+ /LRH

1 The luminescent human 293T cells were selected and inoculated into 6-well plates at 5×10 ⁵ cells/well one day before transfection, and the cell fusion degree was 60% after the second day of culture;

2 Transfection was performed on the second day, and 3 μg of the plasmid was diluted with 200 μL of opti-MEM medium in a culture well of a 6-well plate, and 6 μL of liposome Lipofectamine 2000 was diluted with 200 μL of opti-MEM medium, respectively. After mixing, leave it at room temperature for 5 minutes;

3 gently mix the two tube dilutions, let stand for 20 minutes at room temperature, gently add 600 μL of opti-MEM medium to the mixed dilution;

4 The cells to be transfected were gently rinsed once with PBS, and then the mixed dilutions were gently added to the culture wells and placed in a carbon dioxide incubator for cultivation;

5 After 4 to 6 hours of culture, discard the medium used for transfection, and add 3 mL of complete medium to the well;

After 648 hours, a medium containing 1 μg/mL puromycin was selected for screening; after the cells no longer died, a 293T cell line stably expressing CMKLR1 was obtained.

7 Total RNA was extracted with TRIzol, 2 μg of RNA was quantified for reverse transcription (reverse transcription kit, purchased from Promega), and qPCR was performed using specific primer sequences. The specific primer sequence used was the Hu-CMKLR1 primer sequence:

Fw5'-GAGGCGTGACATAGAATGGA-3'SEQ ID No.16;

Rv5'-TGATATGGATTGGGAGGAAGAC-3'SEQ ID No. 17;

8 Compared with transfected pSM2c-Hu-scramble RNA, the high expression level of CMKLR1 was detected and named as: 293T-CMKLR1 ^+/+ /LRH, which can be used for positive phage screening.

2. Purification, amplification, purification, sequencing and synthesis of CMKLR1 antagonist polypeptides.

Preparation of 1ER2738 host bacterial solution: Aseptic technique, first take 200μl LB-Tet liquid medium in 1.5ml sterile centrifuge tube, then mix 0.2μl bacterial solution from E.coli ER2738 glycerol frozen solution and mix well with it. All the tubes were blotted onto LB-Tet plates, and the plates were labeled, placed at room temperature for 3 min, and then placed in a 37 ° C incubator for overnight incubation. The next day of observation, the clone was grown and sealed with a parafilm, and stored at 4 ° C in the dark. Single colonies were picked by sterile technique using a sterile tip, placed in a 10 ml sterilized centrifuge tube supplemented with 3 ml of LB-Tet liquid medium, labeled, and shaken overnight at 37 ° C, 300 rpm / min. . The next day, the bacterial amplification solution was stored at 4 ° C until use. Take 10ml sterile centrifuge tube, add 3ml LB-Tet liquid medium aseptically, take 30μl of overnight cultured bacteria to inoculate it, shake the incubator at 37°C, shake at 300rpm/min for 2~3h, the bacteria are in exponential growth phase, naked eye Observed as a mist (OD ₆₀₀ ~ 0.5).

Panning of 2CMKLR1 antagonist peptide: high-expression CMKLR1 cells were inoculated into a 60×15 mm ² culture dish pre-coated with polylysine in 10 ⁵ / culture dishes, and cultured until the cell density was 80% to 90%. For panning (while using cell line that does not express CMKLR1 as a blank control), take 1μl of titer for each round of eluate, and add it to 20ml of LB medium for amplification, purification, and finally measurement. After the increased titer, the amplification was stored at 4 ° C for a short period of time and taken for an equal number of stages for the next round of panning, and the remaining amplifications were stored at 50 ° C with glycerol at -20 ° C.

3 Determination of phage titer: Take 4 sterile 10 ml centrifuge tubes, prepare 1 sterile centrifuge tube for each phage dilution, melt the top agar (Agarose Top) in a microwave oven, add 3 ml top agar to each tube, and use a 45 ° C water bath. . One LB/IPTG/Xgal plate was prepared for each phage dilution, and preheated in a 37 °C incubator. E. coli ER2738 E. coli having an OD ₆₀₀ to 0.5 was dispensed according to a phage dilution of 200 μl/tube, and stored at 4 ° C until use. Take 4 sterile 1.5ml centrifuge tubes, respectively, containing 100μl, 90μl, 90μl, 90μl LB-Tet medium, and take 1μl of the phage to be tested into 100μl LB-Tet medium, and dilute it by 10-fold gradient. For 10 ^-1 , 10 ^-2 , 10 ^-3 , 10 ^-4 , gently mix and shake each dilution and centrifuge instantaneously. 10 μl of each dilution of the phage to be titrated was mixed with 200 μl of E. coli ER 2738, gently shaken and mixed, centrifuged instantaneously, and incubated at room temperature for 5 min. The mixed bacterial solution was quickly added to the top agar, mixed rapidly by shaking, and immediately poured into a preheated LB/IPTG/Xgal plate, which was uniformly flattened, cooled at room temperature for 5 min, and cultured in a 37 ° C incubator at room temperature overnight.

4 Amplification and purification of eluted phage: Take a 250 ml Erlenmeyer flask, add the ER2738 host broth cultured overnight to 20 ml LB liquid medium at a ratio of 1:100, and incubate vigorously at 37 ° C, 250 rpm for 2 h; The phage liquid to be amplified was added to an Erlenmeyer flask, and cultured vigorously at 37 ° C, 250 rpm for 4.5 h; the culture was transferred to a 50 ml centrifuge tube and centrifuged at 10,000 rpm for 10 min at 4 ° C. The supernatant was transferred to another clean centrifuge tube and centrifuged again at 10,000 rpm for 10 min at 4 ° C; 80% of the supernatant was transferred to another clean centrifuge tube, 1/4 volume of PEG/NaCl was added, and the mixture was inverted and mixed. The pellet was precipitated overnight at 4 ° C; the next day, the pellet was centrifuged at 12,000 rpm for 20 min at 4 ° C. The supernatant was carefully aspirated with a clean tip and centrifuged at 12,000 rpm for 1 min at 4 ° C to remove the residual supernatant; then the pellet was resuspended in 1 ml of TBS and gently pipetted 100 times. Then, the suspension was transferred to a 2 ml centrifuge tube, and the residual cells were removed by centrifugation at 10,000 rpm for 5 min at 4 ° C; the supernatant was added to 1/4 volume of PEG/NaCl, and then incubated on ice for 60 min to precipitate again; the centrifuge tube was taken out at 4 ° C for 12,000 °C. After centrifugation at rpm for 20 min, the supernatant was removed; the pellet was resuspended in 200 μl of TBS and centrifuged at 10,000 rpm for 1 min at 4 °C. The supernatant is transferred to another centrifuge tube. Short-term storage at 4 ° C, can also be stored with 50% glycerol at -20 ° C for a long time. Amplification of monoclonal phage, including (1) adding the ER2738 host broth cultured overnight to 2 mL LB liquid medium at a ratio of 1:100, vigorously shaking at 37 ° C, 250 rpm for 2 h; using a sterile toothpick, from the fourth round A plate with less than 100 plaques was selected from the titer plate, and the well-separated blue plaques were picked and added to the culture tube, and vigorously shaken at 37 ° C for 250 h/min for 4.5 h; then the culture was transferred to Centrifuge at 10,000 rpm for 30 sec at 4 ° C in a fresh centrifuge tube. The supernatant was transferred to a fresh tube and centrifuged again; 80% of the supernatant was transferred to a fresh centrifuge tube and stored at 4 ° C. It can also be stored with 50% glycerol at -20 ° C for a long time.

5 Agarose gel electrophoresis identification of M13 phage ssDNA: Place the gel forming mold horizontally, place the selected comb, leave 1mm space between the bottom of the comb and the mold; weigh 1g of DNA electrophoresis with agarose into 250ml triangle Add 100 ml of 1×TAE buffer to the flask, mix well, place the flask in a microwave oven, heat and boil until the agarose is completely dissolved; close the induction cooker, take out the Erlenmeyer flask, and let it cool to room temperature at room temperature (hand holding the flask) Can be tolerated), and then add 5μl of ethidium bromide, after mixing, the gel solution is poured into the rubber sheet. The rubber plate used in this experiment requires about 100ml of glue; the gel is completely solidified at room temperature, it takes about 30 minutes, the comb is pulled out, and the rubber plate is placed in the electrophoresis tank; 1×TAE buffer is added to the electrophoresis tank. It is better to raise the surface of the gel by 2mm; the sample is diluted with the Loading buffer and added to the rubber plate. Note that the applicator tip should be placed in the gel sample hole, the gel should not be pierced, and the sample should be prevented. Outside the overflow hole; turn on the power, adjust the voltage to 50 volts, after electrophoresis for 90 minutes, remove the gel plate and observe the result under UV light.

6ssDNA sequencing and sequence analysis: The extracted M13 phage ssDNA was sent to Shanghai Yingji Jieji Biotechnology Co., Ltd. for DNA sequencing. Sequence analysis was performed using Bioedit software after sequencing. According to the analysis results, the sample sequence is Tyr-(D)Asp-Gly-Gln-Trp-Arg-Leu-NH ₂ , in which the second amino acid is in the D configuration, which is represented by LRH7-C3, and the last short peptide is strongly enhanced by Shanghai. Yao Bio Company synthesis.

Figure 1 High performance liquid chromatography (HPLC) and Figure 2 mass spectrometry (MS) showed that the purity of LRH7-C3 polypeptide was 99.85%, and the molecular weight was consistent with the predicted value. The hydrophobic profile analysis of Figure 3 demonstrates that the LRH7-C3 polypeptide has some similarity to CMKLR1 with a similarity of 0.002681 (PAM250).

Example 2 The CMKLR1 antagonist polypeptide LRH7-C3 can effectively promote the inhibitory effect of chemerin on cAMP signaling pathway.

(1) Cyclic adenosine monophosphate (cAMP) enzyme-linked immunosorbent assay:

1 cell plating: wild type 293T cells and 293T cells (293TCMKLR1 ^+/+ ) with high expression of CMKLR1 were seeded at ⁵ ×10 ⁵ cells/well in 6-well cell culture plates at a volume of 1 mL per well. After incubation for 24 h in the chamber, starvation overnight, adding different concentration gradients (3 μM, 0.3 μM, 0.03 μM) of LRH7-C3 polypeptide, Fosklin (25 μM) and chemerin (30 nM) for 6 h;

2 Sample preparation: 300 μL of cell lysate was added to each well, and placed at 4 ° C for 20 minutes. The cells were collected by scraping with a cell scraper, mixed upside down, centrifuged at 12,000 rpm for 10 minutes, and the supernatant was collected;

3 sample concentration determination: sample concentration is determined by BCA method;

4 cyclic adenosine monophosphate (cAMP) enzyme-linked immunosorbent assay:

a, prepare the required reagents, prepare 3 duplicate wells for each sample;

b, 50 μL of the sample or standard is added to the antibody-coated 96-well plate; then 25 μL of cAMP peroxidase tracer conjugate is added to each well;

c, 50 μL of Anti-cAMP antibody was added to each well, and incubated at room temperature for 30 minutes on a shaker;

d, wash 5 times with eluent, add 100 μL of chemical reflective agent per well, incubate for 5 minutes at room temperature;

e, the microplate reader reads the plate and records the luminescence value.

Figure 4 shows that chemerin can reduce cAMP concentration at a concentration of 30 nM, and add LRH7-C3 (3 μM, 0.3 μM, 0.03 μM) to 293T cells (293T CMKLR1 ^+/+ ) with high expression of CMKLR1. It can further promote the reduction of cAMP concentration by chemerin. In the LRH7-C3 short peptide alone group, LRH7-C3 had no significant effect on the change in cAMP concentration. In summary, it can be inferred that LRH7-C3 can specifically promote the reduction of cAMP concentration by chemerin by acting with CMKLR1. *P<0.05, **P<0.01, ***P<0.001 compared with the Forskolin+chemerin group.

Example 3 The CMKLR1 antagonist polypeptide LRH7-C3 can effectively inhibit the influx of calcium (Ca ²⁺ ) induced by chemerin.

1 cell plating: wild type 293T cells and 293T cells (293T CMKLR1 ^+/+ ) with high expression of CMKLR1 were seeded at ⁵ ×10 ³ cells/well in 96-well cell culture plates at a volume of 200 μL per well. After culturing for 24 hours in the incubator, starving overnight;

2 Reagent configuration: Mix probenecid into 1mL buffer solution, configure to a concentration of 250nM probenecid, shake well, add fluorescent reagents to prepare for use;

3 Remove the cell culture medium, add LRH7-C3 polypeptide with different concentration gradient (30μM, 3μM, 0.3μM, 0.03μM, 0.003μM) and chemerin (0.3nM) for 30 minutes, then add 100μL of the above fluorescent reagent per well;

Leave at 437 ° C for 30 minutes, then leave at room temperature for 30 minutes;

5 Fluorescence absorbance was measured at excitation light 494 nm and emission light 516 nm.

Figure 5 shows that in 293T cells (293T CMKLR1 ^+/+ ) with high expression of CMKLR1, chemerin can promote calcium (Ca ²⁺ ) flow signaling pathway and increase calcium ion (Ca ²⁺ ) concentration at a concentration of 0.3 nM. . And after the addition of different concentrations of LRH7-C3 peptide, can significantly reduce the calcium ion (Ca ²⁺⁾ concentrations, inhibition chemerin activation of calcium (Ca ²⁺⁾ stream signal path. However, in wild-type 293T cells that do not express CMKLR1, chemerin has no activation effect on calcium (Ca ²⁺ ) flow signaling pathway, and LRH7-C3 has no effect on calcium (Ca ²⁺ ) flow signaling pathway. Chemerin can activate the calcium (Ca ²⁺ ) flow signaling pathway by binding to the receptor CMKLR1, while the LRH7-C3 short peptide can specifically inhibit the chemerin/CMKLR1 signaling pathway to reduce calcium (Ca ²⁺ ) concentration. *P<0.05, **P<0.01, ***P<0.001 compared with the chemerin group.

Example 4 Transwell assay detects that the CMKLR1 antagonist polypeptide LRH7-C3 inhibits chemerin-induced cellular chemotaxis.

1 Wild type L1.2 cells and L1.2 cells (L1.2CMKLR1 ^+/+ ) with high expression of CMKLR1 were inoculated into 5 μm 96-well Transwell cell culture plates at 1× ^{10 6} cells/well, respectively, and cultured for 6 hours. Hunger for 1h;

2 In the lower chamber of the culture plate, different concentration gradient (30μM, 3μM, 0.3μM, 0.03μM, 0.003μM) of LRH7-C3 polypeptide and chemerin (0.3nM) were added for 2h;

3 Count the number of cells from the upper chamber to the lower chamber by flow cytometry.

Figure 6 shows that in L1.2 cells (L1.2CMKLR1 ^+/+ ) with high expression of CMKLR1, chemerin can significantly promote cell chemotaxis from the upper chamber to the lower chamber, while adding the same concentration of LRH7-C3 short peptide, It can significantly reduce the number of cell chemotaxis and inhibit the chemotaxis of chemerin to cells. However, in wild type L1.2 cells that do not express CMKLR1, chemerin has no chemotactic effect on cells, and LRH7-C3 short peptide has no effect on cells. From this experiment, it can be inferred that chemerin can promote cell chemotaxis by binding to the receptor CMKLR1, while the LRH7-C3 short peptide can specifically block the chemerin/CMKLR1 signaling pathway to inhibit cell chemotaxis. *P<0.05, **P<0.01, ***P<0.001 compared with the chemerin group.

Example 5 LRH7-C3 significantly inhibited the proliferation of human ovarian cancer SKOV-3 cells.

1 Human ovarian cancer cell line SKOV-3 was inoculated into a 96-well cell culture plate at ⁵ ×10 ³ cells/well, and the medium volume per well was 200 μL, cultured for 24 hours, and then starved overnight;

2 LRH7-C3 polypeptides with different concentration gradients (100 μM, 10 μM, 1 μM, 0.1 μM, 0.01 μM, 0.001 μM) were cultured for 24 hours, 48 hours, and 72 hours, respectively;

3 Add 20 μL of MTT working solution per well and continue to incubate for 4 hours in a carbon dioxide incubator;

4 Discard the supernatant in the culture plate, add 150 μL of DMSO (dimethyl sulfoxide), shake for 10 minutes, select the wavelength of 490 nm on the microplate reader for detection, and plot the growth curve of the cells.

In the preliminary work of the inventor's laboratory, it was found by q-PCR test that ovarian cancer cell SKOV-3 highly expressed CMKLR1. Figure 7 shows that different concentrations of LRH7-C3 short peptide can significantly inhibit SKOV-3 cell proliferation, and the effect of short peptides on SKOV-3 cell proliferation is more pronounced with increasing action time.

Example 6 LRH7-C3 blocks the cell cycle progression of human ovarian cancer SKOV-3.

1 Human ovarian cancer cell line SKOV-3 was inoculated into a 6-well cell culture plate at ⁵ ×10 ⁵ cells/well, and the volume of the culture medium per well was 1 mL, cultured for 24 hours, and then starved overnight;

2 LRH7-C3 polypeptides with different concentration gradients (1 μM, 0.1 μM, 0.01 μM) were added for 24 hours, 48 hours, and 72 hours, respectively;

3 Carefully collect the cell culture medium into a centrifuge tube for later use. The cells are digested with trypsin, and when the cells can be gently pipetted with a pipette or a pipette tip, the previously collected cell culture medium is added, all adherent cells are blown down, and the cells are gently blown off. Collect again into the centrifuge tube. Centrifuge for about 3-5 minutes at 1000g to precipitate cells;

4 Carefully remove the supernatant and leave about 50 μl of the culture solution to avoid aspiration. Add about 1 ml of ice bath to pre-cooled PBS, resuspend the cells, and transfer to a 1.5 ml centrifuge tube. The cells were again pelleted by centrifugation, and the supernatant was carefully aspirated, leaving about 50 μl of PBS remaining to avoid aspiration of the cells. Gently bomb the bottom of the centrifuge tube to properly disperse the cells to avoid cell agglomeration;

5 Add 1 ml of ice bath to pre-cool 70% ethanol, mix gently by blowing, and fix at 12 °C for 12 h. Centrifuge the cells for about 3-5 minutes by centrifugation at 1000 g. Carefully aspirate the supernatant to leave approximately 50 microliters of 70% ethanol to avoid aspiration. Add about 1 ml of ice bath pre-chilled PBS and resuspend the cells. The cells were again pelleted by centrifugation, and the supernatant was carefully aspirated, leaving about 50 μl of PBS remaining to avoid aspiration of the cells. Gently bomb the bottom of the centrifuge tube to properly disperse the cells to avoid cell agglomeration;

6 Add 0.5 ml of propidium iodide staining solution to each cell sample, slowly and fully resuspend the cell pellet, and leave the bath at 37 ° C for 30 minutes. It can then be stored in the dark at 4 ° C or in an ice bath;

7 The red fluorescence was detected by a flow cytometer at an excitation wavelength of 488 nm, and the light scattering was detected. Analyze the cell results.

Figure 8 shows that by flow cytometry analysis, on the one hand, with the increase of the concentration of action, LRH7-C3 short peptide can significantly reduce the number of cells in human ovarian cancer cells SKOV-3G2/M phase, increase G0/G1 and S phase The number of cells blocked the normal progression of the cell cycle; on the other hand, with the prolongation of the action time, the LRH7-C3 short peptide also significantly decreased the number of cells in the G2/M phase, increased the number of G0/G1 and S phases, and blocked the normal progression of the cell cycle. In summary, it can be inferred that the LRH7-C3 short peptide inhibits the proliferation of human ovarian cancer cell line SKOV-3 by blocking the cell cycle. * P <0.05, ** P < 0.01 control group G0 / G1 phase compared; ^# P <0.005 compared to the control group of S; ^& P <0.005 with the control group G2 / M phase compared.

Example 7 LRH7-C3 can promote apoptosis of human ovarian cancer SKOV-3 cells.

3 The supernatant was collected into a centrifuge tube, and the cell culture medium was carefully digested with trypsin without EDTA to the centrifuge tube. Centrifuge for 5 minutes at about 500g to precipitate the cells;

4 Wash the cells twice with pre-cooled PBS, and centrifuge the cells for about 5 minutes to collect the cells;

5 Resuspend the cells by adding 100 μL of pre-cooled 1xAnnexinV Binding Buffer;

6 Add 5 μL of Annexin V-FITC and 5 μL of PI, mix gently, and react at room temperature for 15 minutes in the dark;

7 Add 400 μL of pre-cooled 1xAnnexinV Binding Buffer, mix gently, place the sample on ice and protect it from light, and measure it by flow cytometry within 1 h. Analyze the test results.

Figure 9 shows that by flow cytometry analysis, on the one hand, with the increase of the concentration of action, LRH7-C3 short peptide can significantly promote the apoptosis of human ovarian cancer cell line SKOV-3, on the other hand, with the prolongation of the action time The LRH7-C3 short peptide also significantly increased the number of apoptosis in human ovarian cancer cell line SKOV-3. In summary, LRH7-C3 short peptide can significantly promote the apoptosis of human ovarian cancer cell line SKOV-3. *P<0.05, **P<0.01 compared with the control group.

Claims

A CMKLR1 antagonist polypeptide characterized in that the amino acid sequence thereof is Tyr-(D)Asp-Gly-Gln-Trp-Arg-Leu-NH 2 SEQ ID No. 1.
A biologically active fragment or analog of a CMKLR1 antagonist polypeptide, as set forth in SEQ ID No. 2-15:

YX 1 GX 2 WRX 3 SEQ ID No. 2, where:

( 1) X 1 is glutamic acid;

( 2) X 2 is glutamic acid;

( 3) X 3 is methionine;

YX 4 GX 5 WR SEQ ID No. 3, where:

(1) X 4 is asparagine or glutamic acid;

(2) X 5 is glutamic acid;

YX 6 GX 7 W SEQ ID No. 4, where:

(1) X 6 is glutamic acid;

(2) X 7 is glutamic acid;

GX 8 WRL SEQ ID No. 5, where:

(1) X 8 is histidine;
A CMKLR1 antagonist polypeptide according to claim 1 or a derivative of a biologically active fragment or analog of the CMKLR1 antagonist polypeptide of claim 2, characterized in that:

The derivative is a product obtained by conventional modification of an amino acid side chain group, an amino terminal or a carboxy terminus of a CMKLR1 antagonist polypeptide or a biologically active fragment live analog thereof, or a label for ligation or purification of a polypeptide or protein. The product obtained;

Preferably, the conventional modification is amination, amidation, hydroxylation, carboxylation, carbonylation, alkylation, acetylation, phosphorylation, esterification, glycosylation, cyclization, biotinylation, fluorophore Group modification, polyethylene glycol PEG modification or immobilization modification; the label is His 6 , GST, EGFP, MBP, Nus, HA, IgG, FLAG, c-Myc or ProfinityeXact.
A polynucleotide encoding the polypeptide of any one of SEQ ID No. 1-15.
A vector comprising any one of the polynucleotides of claim 4 and linked to a promoter sequence by genetic means.
A host cell transfected with the vector of claim 5.
Use of the CMKLR1 receptor antagonist polypeptide of claim 1, the biologically active fragment or analog of claim 2, and the derivative of claim 3 for the treatment of a chemerin/RvE1CMKLR1 mediated disease;

Preferably, the chemerin/RvE1-CMKLR1 mediated disease is selected from the group consisting of breast cancer, fatty liver, diabetes, and an inflammatory response.
Use of the CMKLR1 receptor antagonist polypeptide according to claim 1, the biologically active fragment or analog of claim 2, and the derivative of claim 3 for the preparation of a medicament for inhibiting a decrease in cAMP concentration caused by chemerin.
The CMKLR1 receptor antagonist polypeptide according to claim 1, the biologically active fragment or the analog of claim 2, and the derivative of claim 3, for preparing a drug for inhibiting calcium (Ca 2+ ) influx caused by chemerin Use in.
Use of the CMKLR1 receptor antagonist polypeptide of claim 1, the biologically active fragment or analog of claim 2, and the derivative of claim 3 for the preparation of a medicament for inhibiting chemotaxis caused by chemerin.
A pharmaceutical composition comprising one or more of the CMKLR1 receptor antagonist polypeptide of claim 1, the biologically active fragment or analog of claim 2, and the derivative of claim 3, Active ingredient

Preferably, the pharmaceutical composition may contain one or a plurality of pharmaceutically acceptable carriers;

The pharmaceutically acceptable carrier is preferably a diluent, an excipient, a filler, a binder, a wetting agent, a disintegrant, an absorption enhancer, an adsorption carrier, a surfactant or a lubricant;

The pharmaceutical composition may be further prepared into various forms such as tablets, granules, capsules, oral solutions or injections, and the medicaments of various dosage forms may be prepared according to a conventional method in the pharmaceutical field.