CN111568894A - Use of 2- (ethylaminomethyl) -5- (phenyl) furan for the preparation of a medicament for inhibiting TLR7/8 - Google Patents

Use of 2- (ethylaminomethyl) -5- (phenyl) furan for the preparation of a medicament for inhibiting TLR7/8 Download PDF

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CN111568894A
CN111568894A CN202010418422.6A CN202010418422A CN111568894A CN 111568894 A CN111568894 A CN 111568894A CN 202010418422 A CN202010418422 A CN 202010418422A CN 111568894 A CN111568894 A CN 111568894A
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杨谨成
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Abstract

The invention discloses an application of a 2- (substituted ethylaminomethyl) -5- (substituted phenyl) furan compound or a medicinal salt thereof in preparing a medicament for inhibiting TLR7/8, which is characterized in that the 2- (substituted ethylaminomethyl) -5- (substituted phenyl) furan compound is shown as the following formula I:
Figure DDA0002495956690000011
the 2- (substituted ethylaminomethyl) -5- (substituted phenyl) furan compound has TLR7/8 inhibitor effect, and can inhibit tumor treatment by inhibiting TLR7/8Hyperglycemia due to therapy and its associated adverse consequences, such as infection and non-malignant tumor-related death, cell proliferation rate>80%, the cytotoxicity is lower, and the normal growth of cells is not influenced; the anti-inflammatory effect is better than that of indometacin, the anti-inflammatory activity is better, the cytotoxicity is lower, NF-kB can be blocked by inhibiting TLR7/8, the expression of proinflammatory genes is inhibited, and the aim of treating inflammation is fulfilled.

Description

Use of 2- (ethylaminomethyl) -5- (phenyl) furan for the preparation of a medicament for inhibiting TLR7/8
Technical Field
The invention relates to a TLRs receptor inhibitor, in particular to an application of a 2- (substituted ethylaminomethyl) -5- (substituted phenyl) furan compound or a medicinal salt thereof in preparing a medicament for inhibiting TLR 7/8.
Background
TLRs (Toll-like receptors) receptors are members of the interleukin receptor (IL-1R) superfamily, mainly play a role in the innate immune system, are single, transmembrane, non-catalytic receptors and recognize structure-specific molecules derived from microorganisms. Among them, TLR7 not only recognizes small molecule compounds with antiviral and antitumor effects such as imidazoquinoline analogs, but also recognizes viral ssRNA, activates MyD88 signal pathway, activates immune cells, and promotes the expression of downstream cytokines such as IFN, TNF-alpha, IL-12, etc., thereby mediating the immune regulation of the body and the regulation of tumor cells. TLR7 agonists can activate both innate and cell-regulated immune pathways. However, activation of the endogenous immune system through TLR7 is one of the pathogenesis causes of insulin resistance, diabetes and atherosclerosis.
Hyperglycemia is a major side effect of tumors and tumor therapy, and the occurrence of hyperglycemia is not related to diabetes. Glucose is the only energy source for tumor cells. The hyperglycemic state can be used as a nutrient medium to promote the growth of tumor cells, so that the tumor cells have more sufficient energy to complete the rapid proliferation. Hyperglycemia can lead to a range of adverse outcomes, such as infection and non-malignant tumor-related death. Hyperglycemia increases the risk of clinical toxicity, neutropenia, neutropenic fever, sepsis and neuropathy. Hyperglycemia in the course of tumor treatment is also one of the clinical toxicities that lead to delayed chemotherapy efficacy, reducing the patient's response to chemotherapeutic drugs.
Hyperglycemia in turn can activate the TLR pathway. Chronic hyperglycemia is associated with inflammation (high NO levels) and oxidative stress. The neuroinflammatory state caused by hyperglycemia activates the NF- κ B pathway, which in turn activates microglia and astrocytes, resulting in brain-related neuropathological responses.
Therefore, the side effects brought by the activation of NF-kB pathway by TLRs and the relation between TLR and NF-kB pathway activation and hyperglycemia and inflammation promote the further research of TLR inhibitors.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide application of a 2- (substituted ethylaminomethyl) -5- (substituted phenyl) furan compound or a pharmaceutically acceptable salt thereof in preparing a medicament for inhibiting TLR7/8, which can solve the problem that the existing TLR agonist has side effects.
To achieve the above objects, the present invention provides the use of a 2- (substituted ethylaminomethyl) -5- (substituted phenyl) furan compound or a pharmaceutically acceptable salt thereof for the manufacture of a medicament for inhibiting TLR7/8, the 2- (substituted ethylaminomethyl) -5- (substituted phenyl) furan compound being represented by formula I below:
Figure BDA0002495956670000021
wherein R1 is selected from any one of the following substituents:
Figure BDA0002495956670000022
Figure BDA0002495956670000031
r2 is selected from any one or more of the following substituents:
-Cl、-Br、-OH、
Figure BDA0002495956670000032
Figure BDA0002495956670000033
in a preferred embodiment, the medicament is used for in vitro anti-inflammatory, MyD88 pathway inhibition, NF-kB pathway inhibition.
In a preferred embodiment, the above-mentioned medicament is for the treatment and/or prevention of inflammation, hyperglycemia.
In a preferred embodiment, the hyperglycemia is hyperglycemia due to tumor treatment.
In a preferred embodiment, the pharmaceutically acceptable salts include, but are not limited to, carbonate, hydrochloride, sulfate, sulfite, maleate, succinate, hydrobromide, nitrate, phosphate, metaphosphate, perchlorate, and one or more of formate, acetate, propionate, malonate, acrylate, succinate, oxalate, D or L malate, fumarate, benzoate, hydroxybutyrate, phthalate, methanesulfonate, ethanesulfonate, sulfonate, salicylate, tartrate, citrate, lactate, mandelate.
In a preferred embodiment, R1 is selected from any one of the following substituents:
Figure BDA0002495956670000041
in a preferred embodiment, R2 is selected from any one of the following substituents:
-Cl、-Br、-OH、
Figure BDA0002495956670000042
in a preferred embodiment, the compound of formula I above is a compound of formula 1 below:
Figure BDA0002495956670000043
in a preferred embodiment, the compound of formula I above is a compound of formula 2 below:
Figure BDA0002495956670000044
compared with the prior art, the invention has the following beneficial effects:
(1) both compound 1 and compound 2 form hydrogen bonds with Asp555, Thr586, but unlike TLR7/8 agonists, the hydrogen bond strength is not as strong as agonists such as R848(resiquimod, raemont); in addition, the binding mode of the TLR7/8 inhibitor molecule compound 1 and the TLR7/8 agonist is obviously different from that of the TLR7/8 agonist, almost all the TLR7/8 inhibitor molecule compound 1 and the TLR 368 inhibitor molecule compound 2 are combined with TLR7/8 protein in the X-axis direction, and interact with adjacent loops of 2-3 TLR7/8 molecules, like a cap binding mode, and are firmly buckled on a first-site position, so that a relatively conservative system structure is formed, and a dimer system formed by overlapping two TLRs 7/8 is difficult to form.
(2) The test principle of the inhibitor is that the inhibitor is firstly added to cultivate cells, then the agonist is added, then the agonistic effect is tested, and if the agonistic effect is not generated, the inhibitory activity is shown. The agonistic effect of CL097 is 100%, the percentage of the agonistic effect of TLR7/8 of compound 1 or compound 2 is low, which indicates that the 2- (substituted ethylaminomethyl) -5- (substituted phenyl) furan compound or the pharmaceutically acceptable salt thereof has TLR7/8 inhibitor effect, better effect than TLR7/8 agonist CL097, and can block hyperglycemia caused by tumor treatment and adverse effects thereof, such as infection and non-malignant tumor-related death, by inhibiting TLR 7/8. Meanwhile, the cell proliferation rate of the compound 1 and the compound 2 is more than 80 percent, which indicates that the 2- (substituted ethylaminomethyl) -5- (substituted phenyl) furan compound or the medicinal salt thereof has low cytotoxicity and does not influence the normal growth of cells.
(3) The invention uses LPS to stimulate cells to generate inflammation, then adds anti-inflammatory compound, measures NO concentration and finally determines anti-inflammatory effect. The anti-inflammatory effect of the compound 1 is better than that of indometacin, the cell proliferation rate of the compound is higher than that of negative control, the 2- (substituted ethylaminomethyl) -5- (substituted phenyl) furan compound or the medicinal salt thereof has better anti-inflammatory activity and lower cytotoxicity, and NF-kB can be blocked by inhibiting TLR7/8, so that the expression of proinflammatory genes is inhibited, and the aim of treating inflammation is fulfilled.
In conclusion, the 2- (substituted ethylaminomethyl) -5- (substituted phenyl) furan compound of formula I or a pharmaceutically acceptable salt thereof has TLR7/8 inhibitory activity, is low in cytotoxicity, does not have the side effects of existing TLR agonists, and does not affect normal growth of cells while being capable of treating inflammation and hyperglycemia.
Drawings
FIG. 1 is a graph of the effect of compound 1, compound 2 and a control compound TLR7/8 activator on the inhibitory activity of TLR7/8 protein in HEK293 cells and the rate of cell proliferation as determined by CCK-8.
Figure 2 is a schematic representation of molecular docking of compound 1 with TLR7/8 protein.
Figure 3 is a schematic representation of molecular docking of compound 2 with TLR7/8 protein.
Figure 4 is the effect of compound 1, compound 2 and the control anti-inflammatory compound indomethacin on NO inhibitory activity.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
According to computer-aided drug design, virtual screening is carried out in the first round, drug formation experience evaluation is carried out in the second round, synthesis feasibility evaluation is carried out in the third round, lead compounds 1 and compounds 2 are purchased in the fourth round, and finally pharmacological experiment confirmation is carried out on the compounds 1 and the compounds 2.
Example 1
Effect of Compound 1, Compound 2 and control Compound TLR7/8 activator on the inhibitory Activity of TLR7/8 protein in HEK293 cells and cell proliferation Rate determined by CCK-8
The scheme is as follows: HEK-BlueTMhTLR7 cells (HEK 293 cells transfected with humanized TLR7, from InvivoGen) were seeded in 96-well plates at a density of 4 × 104Agonist CL097(5 μ M) and test compound 1 or compound 2(40 μ M) were added overnight per well to give a supernatant. The resulting supernatant was aspirated by pipette, the supernatant (20. mu.L) was assayed by Quanti-blue (OD 630nm), and the residue was assayed for cell proliferation rate by CCK-8. If the cell proliferation rate is high, the cytotoxicity is low, and the cells can grow normally.
Index of Quanti-Blue value (A-B)/(C-B); wherein A: average value of the wells to be measured; b: an average value of the cell-containing matrix; c: positive control (CL 097).
The method comprises the following operation steps:
① HEK-TLR7/8 cell line of HEK293 line was seeded in 96-well plate, 4 × 104One/well/100. mu.L. Test Compound 1 or test Compound 2 (40. mu.M, 100. mu.L), 37 ℃ with 5% CO was added2And staying overnight;
50mL of DMEM medium: 5mL of FBS (10%), 500. mu.L of PS (100X), 100. mu.L of Normocin (0.01%), 500. mu.L of L-glutamine, 50. mu.L of Zeocin (100mg/mL) and 50. mu.L of Blastin (10 mg/mL).
② on the next day, 20 mu L of supernatant is taken and added with QUANTI-Blue to 200 mu L for color development (630 nm).
③ adding TLR7/8 agonist CL097 (purchased from InvivoGen company) into the original 96 pore plate at 5 μ M/pore; the next day, 20. mu.L of supernatant was added with QUANTI-Blue to 200. mu.L, and color development (630nm) was performed.
Fourthly, adding 10 mu L of reagent CCK-8 into the residual liquid, detecting the cell proliferation rate (450nm), and calculating the formula as follows:
Figure BDA0002495956670000071
Figure BDA0002495956670000072
the principle of the embodiment is as follows: the inhibitory effect of compound 1 and compound 2 was tested by measuring TLR7/8 agonist activity. If TLR7/8 is inhibited, its downstream agonistic activity is reduced.
In FIG. 1, the ordinate represents the cell proliferation rate and TLR7/8 inhibitory effect, the better the TLR7/8 inhibitory effect, the lower the bar graph. As can be seen from FIG. 1, the agonist effect of the positive control CL097 is 100%, and the percentage of the agonist effect of the TLR7/8 of the compound 1 or the compound 2 is low, which indicates that the two compounds have the TLR7/8 inhibitor effect and the effect is better than that of the TLR7/8 agonist CL 097. In addition, compound 1 has a superior inhibitory effect to compound 2. The cell proliferation effect of compound 1 and compound 2 was simultaneously measured to detect the cytotoxicity of compound 1 and compound 2. The cell proliferation rate of the compound 1 and the compound 2 is more than 80 percent, which indicates that the two compounds have low cytotoxicity and do not influence the normal growth of cells. The compound 1 and the compound 2 can block hyperglycemia caused by tumor treatment, such as infection and non-malignant tumor related death, by inhibiting TLR 7/8.
The molecular docking is illustrated in conjunction with fig. 2 and 3. For TLR7/8 inhibitor molecules compound 1 and compound 2, the inhibitor of interest was able to stably bind to TLR7/8 from a binding pattern. Both compound 1 and compound 2 form hydrogen bonds with Asp555, Thr586, but unlike TLR7/8 agonists, hydrogen bond strength is not as strong as those of R848; in addition, the binding mode of the TLR7/8 inhibitor molecule compound 1 and the TLR7/8 agonist is obviously different from that of the TLR7/8 agonist, almost all the TLR7/8 inhibitor molecule compound 1 and the TLR 368 inhibitor molecule compound 2 are combined with TLR7/8 protein in the X-axis direction, and interact with adjacent loops of 2-3 TLR7/8 molecules, like a cap binding mode, and are firmly buckled on a first-site position, so that a relatively conservative system structure is formed, and a dimer system formed by overlapping two TLRs 7/8 is difficult to form.
Example 2
NO Activity assay and cell survival assay for Compound 1/Compound 2
The scheme is that RAW264.7 cells are inoculated in a 96-well plate, and the density is 4 × 104One well, 1.5h later compound 1, compound 2 or indomethacin (40 μ M) and Lipopolysaccharide (LPS) (1 μ g/mL, 10 μ L/well) were added. After 24h, the NO concentration was measured by Griess reagent (540 nm); cell growth was measured by MTT (200. mu.L, 0.5mg/mL, 450 nm).
The method comprises the following operation steps:
① RAW264.7 cells were cultured in DMEM medium (10% FBS + 1% penicillin/streptomycin), 37 ℃ and 5% CO2Inoculating to 96-well plate (5 × 10) after cell growth is stable4One/well), overnight.
② after addition of compound (40. mu.M, 100. mu.L) LPS (1. mu.g/mL, 10. mu.L/well) was added.
③ taking 50 μ L of cell supernatant on the next day, and simultaneously drawing a standard curve by using a Griess kit (nitric oxide kit, purchased from Biyuntian Biotechnology Co., Ltd.).
And fourthly, removing the supernatant, adding 200 mu L (0.5mg/mL) of MTT [3- (4, 5-dimethylthiazole-2) -2, 5-diphenyl tetrazolium bromide ] into the supernatant, blackening the cells after 4h, sucking the supernatant, adding 150 mu L of DMSO into the residue, shaking the mixture for 15min to dissolve the residue, and detecting the NO inhibition rates of the compound 1, the compound 2 and the anti-inflammatory compound indometacin at 450nm, 490 nm, 520 nm and 570nm respectively. The calculation formula is as follows:
Figure BDA0002495956670000081
Figure BDA0002495956670000091
the measurement principle of the embodiment is as follows: the cells are stimulated to produce inflammation with LPS, then anti-inflammatory compounds are added, the NO concentration is measured, and finally the anti-inflammatory effect is determined. Indomethacin is a recognized anti-inflammatory compound and is also a commonly used anti-inflammatory positive control. FIG. 2 is a graph showing the anti-inflammatory activity of NO and the cell proliferation rate, wherein the ordinate represents the cell proliferation rate and the NO inhibition rate, the better the anti-inflammatory effect, and the higher the columnar shape. As can be seen from FIG. 2, compound 1 in this example has better anti-inflammatory effect than indomethacin, and higher cell proliferation rate than that of the negative control, indicating that compound 1 has better anti-inflammatory activity and lower cytotoxicity.
TLRs clear pathogens and produce toxic inflammatory mediators, which are produced in excessive amounts and cause a number of side effects. The compound 1 and the compound 2 can block NF-kB by inhibiting TLR7/8, thereby inhibiting the expression of proinflammatory genes and further achieving the purpose of treating inflammation.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims (9)

  1. Use of a 2- (substituted ethylaminomethyl) -5- (substituted phenyl) furan compound, or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for inhibiting TLR7/8, wherein the 2- (substituted ethylaminomethyl) -5- (substituted phenyl) furan compound is represented by formula I below:
    Figure FDA0002495956660000011
    wherein R1 is selected from any one of the following substituents:
    Figure FDA0002495956660000012
    r2 is selected from any one of the following substituents:
    -Cl、-Br、-OH、
    Figure FDA0002495956660000013
    Figure FDA0002495956660000014
  2. 2. the use according to claim 1, wherein the medicament is for anti-inflammatory, MyD88 pathway inhibition, NF- κ B pathway inhibition in vitro.
  3. 3. Use according to claim 1, characterized in that the medicament is for the treatment and/or prevention of inflammation, hyperglycemia.
  4. 4. Use according to claim 3, characterized in that the hyperglycemia is hyperglycemia as a result of tumor therapy.
  5. 5. The use according to claim 1, wherein the pharmaceutically acceptable salts include, but are not limited to, one or more of carbonate, hydrochloride, sulfate, sulfite, maleate, succinate, hydrobromide, nitrate, phosphate, metaphosphate, perchlorate, formate, acetate, propionate, malonate, acrylate, succinate, oxalate, D or L malate, fumarate, benzoate, hydroxybutyrate, phthalate, methanesulfonate, ethanesulfonate, sulfonate, salicylate, tartrate, citrate, lactate, mandelate.
  6. 6. The use according to claim 1, wherein R1 is selected from any one of the following substituents:
    Figure FDA0002495956660000021
  7. 7. the use according to claim 1, wherein R2 is selected from any one or more of the following substituents:
    -Cl、-Br、-OH、
    Figure FDA0002495956660000022
  8. 8. use according to claim 6, wherein the compound of formula I is a compound of formula 1 below:
    Figure FDA0002495956660000031
  9. 9. use according to claim 7, wherein the compound of formula I is a compound of formula 2 below:
    Figure FDA0002495956660000032
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