CN103265947A - Indolpyridine type fluorescent probe for imaging RNA and nucleolus in living cell - Google Patents
Indolpyridine type fluorescent probe for imaging RNA and nucleolus in living cell Download PDFInfo
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- CN103265947A CN103265947A CN2013102165019A CN201310216501A CN103265947A CN 103265947 A CN103265947 A CN 103265947A CN 2013102165019 A CN2013102165019 A CN 2013102165019A CN 201310216501 A CN201310216501 A CN 201310216501A CN 103265947 A CN103265947 A CN 103265947A
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Abstract
The invention discloses a kind of indolepyridinium salt fluorescence probes being imaged for RNA in living cells and kernel, and the fluorescence probe general structure is such as shown in (I), and wherein R1, R2 indicate alkyl, hydroxyalkyl or ether. The invention also discloses the fluorescence probes to mark or show that RNA and kernel are distributed in living cells and identify the application in cell life or death state. Probe of the invention have it is applied widely, membrane permeability is good, and cytotoxicity is low, can be in competent cell the characteristics of single-minded fluorescence imaging RNA.
Description
Technical field
The present invention relates to a kind of fluorescent probe, relate in particular to a kind of indoles pyridine salt fluorescent probe for viable cell RNA and kernel imaging.
Background technology
Nucleic acid is the basal component of all biomass cellss still not, and also the great biological phenomenas such as growth, growth, breeding, heredity and variation to organism play the dominant force effect.As nucleic acid oxygenolysis thing--purine is to cause human uric acid to increase major cause with gout.Nucleic acid molecule is divided into two classes: thymus nucleic acid (DNA) and Yeast Nucleic Acid (RNA), protein copy and synthetic in play a part to store and convey hereditary information.DNA is the essential substance basis that stores, copies and convey hereditary information, and RNA plays an important role in protein building-up process, and wherein transfer RNA (tRNA) (tRNA) carries and shift activated amino acid; Messenger RNA(mRNA) (mRNA) is the template of synthetic protein; Ribosome-RNA(rRNA) (rRNA) is the main place of cell synthetic protein.
Kernel in the cell has had been found that more than 100 year, but its biological function is not illustrated fully.People generally believe that kernel is the place of rrna rna transcription, processing, assembling in the nuclear.Usually begin to disappear at fissional early stage kernel, mid-term and later stage completely dissolve, telophase the privileged sites on certain karyomit(e)---nucleolus organizer's (the rRNA gene is where) forms nucleolar structure again, and increase gradually, be fused into one or several kernel, kernel continues to exist in the interval cell, and the structure and function of kernel is relevant with the Metabolic activity of cell, propagation and differentiation, and kernel type, number and the size of different cells all have nothing in common with each other.Cause the mechanism of various kernel composition adhesion still under study for action.Kernel also has a lot of other functions, for example, signal identification, particle RNA maturation, the potential function of somatomedin and somatomedin associated protein, the investigator has also proposed potential contact of kernel and tumour, aging.
The fluorescence imaging of RNA in kernel and the tenuigenin is very significant to biological chemistry and biological medicine.Compare numerous commercial dna probes, rna probe is considerably less, because existing nucleic acid probe is general and double-stranded DNA has bigger affinity, and the mechanism of action of small molecules and RNA it be unclear that, so the research of rna probe is the comparison difficulty.
Retrieval shows that molecular probe company (Molecular Probes Co.) can only provide a typical commercial rna probe " SYTO RNA-Select " that can be used for the RNA imaging, but its chemical structure is still in maintaining secrecy.The shortage of RNA visible probe has limited the exploitation of pathological research and medicine at present.So RNA or the kernel fluorescent probe of development novel texture and function are extremely urgent.
Summary of the invention
At the deficiencies in the prior art, the problem to be solved in the present invention provides a kind of indoles pyridine salt fluorescent probe for viable cell RNA and kernel imaging.
Indoles pyridine salt fluorescent probe for viable cell RNA and kernel imaging of the present invention, it is characterized in that: described fluorescent probe general structure is shown in (I):
Wherein: above-mentioned R
1, R
2Expression alkyl, hydroxyalkyl or ether.
In the above-mentioned indoles pyridine salt fluorescent probe for viable cell RNA and kernel imaging: described R
1Preferred hydrogen, C
1-6Alkyl, hydroxyalkyl or ether base, R
2Preferred C
1-4Alkyl or hydroxyalkyl.
In the above-mentioned indoles pyridine salt fluorescent probe for viable cell RNA and kernel imaging: described R
1Hydrogen most preferably, R
2Most preferable.Most preferred fluorescent probe is (E)-4-(2-(1H-indoles-3-) vinyl)-1-picoline salt compounded of iodine (abbreviating 2c as).
Above-mentioned indoles pyridine salt fluorescent probe compounds preparation method for viable cell RNA and kernel imaging is summarized as follows:
In order to increase the adaptability of molecule under physiological environment, the contriver at first introduces ethyl, butyl or ether base at indole nitrogen, utilize the Vilsmeier reaction to synthesize corresponding single aldehyde then, utilize the Knoevenagel reaction to obtain final product indoles pyridinium salt compounds at last.
Concrete, above-mentioned (E)-4-(the preparation feedback formula of 2-(1H-indoles-3-) vinyl)-1-picoline salt compounded of iodine compound (2c) is as follows:
Indoles pyridine salt fluorescent probe for viable cell RNA and kernel imaging of the present invention is at mark or show the application that RNA and kernel distribute in viable cell.
The application of indoles pyridine salt fluorescent probe in identification of cell life or death state for viable cell RNA and kernel imaging of the present invention.
Wherein: described cell is HeLa, SiHa or H17702 cell.
Experimental result confirms, utilize the fluoroscopic image behind the fluorescent probe mark of the present invention to show, at tenuigenin and nucleolar zone tangible green light distribution is arranged, clearly point out described probe can be in viable cell RNA in narrow spectrum imaging kytoplasm and the kernel, and with traditional kernel fluorescent probe or with compare test through the cell behind the RNase A digestion experiment after also further confirmed.Propidium iodide (PI) is a kind of traditional imaging apoptosis or the fluorescence dye that glows of non-viable non-apoptotic cell nuclear, after utilizing fluorescent probe of the present invention and propidium iodide (PI) to compare test, what the entoblast that red fluorescence is arranged of finding every PI mark did not have that fluorescent probe of the present invention sends has the green fluorescence of obvious difference with PI fluorescence, point out fluorescent probe of the present invention optionally kernel and the RNA of imaging viable cell, this also provides another approach for fluorescent probe of the present invention is used for identification of cell life or death state.
Indoles pyridine salt fluorescent probe provided by the invention is the novel RNA selectivity identification fluorescent probe molecule of a class, the kernel fluorescent probe ratio close with its function, probe of the present invention has that membrane permeability is good, colour developing is strong, redye the characteristics compatible good, that light stability is stronger, indicate that it has widely as RNA and kernel fluorescent probe and use, be expected to be developed as the RNA physiology relevant with kernel and pathological research with simple and direct, biological detection reagent intuitively.
Description of drawings
Fig. 1: (E)-4-(fluorescence micrograph that 2-(1H-indoles-3-) vinyl)-1-picoline salt compounded of iodine (2c) dyes and obtains under 460-495 nanometer mercury lamp irradiation live HeLa, SiHa and H17702 cell.
Fig. 2: (E)-4-(the confocal fluorescent Photomicrograph that 2-(1H-indoles-3-) vinyl)-1-picoline salt compounded of iodine (2c) dyes and obtains under 488 nanometer laser irradiation active H17702 cell.Left side figure is laser scanning co-focusing mirror fluorescence micrograph; Middle figure is the differential interference Photomicrograph of light field laser scanning; The combined diagram that right figure is two figure in the left side (location map altogether).
Fig. 3: to fixing HeLa cell after rnase (RNase) is handled, (2-(1H-indoles-3-) vinyl)-1-picoline salt compounded of iodine (2c) dyes the fluorescence micrograph that obtains under 460-495 nanometer mercury lamp irradiation to the HeLa cell with (E)-4-.Wherein: a left side 1, left 2 figure: fix with-20 ℃ of methyl alcohol; A left side 3, left 4 figure: fix with paraformaldehyde solution.
Fig. 4: (E)-(2-(1H-indoles-3-) vinyl)-1-picoline salt compounded of iodine (2c) carries out the fluorescence micrograph that common dyeing obtains with propidium iodide (PI) to HeLa, SiHa and H17702 cell to 4-under mercury lamp irradiation.
Fig. 5: (E)-(2-(1H-indoles-3-) vinyl)-1-picoline salt compounded of iodine (2c) carries out the fluorescence micrograph that counterstaining obtains with traditional core acid dye Hoechst33342, plastosome fluorescent probe plastosome red (MTR) to active H17702 cell to 4-under mercury lamp irradiation.Wherein: green glow is from (E)-4-(2-(1H-indoles-3-) vinyl)-1-picoline salt compounded of iodine (2c) (left side 1), blue light is from a Hoechst33342(left side 2), and ruddiness is from plastochondria red (MTR) (left side 3), and (left side 4) is stacking diagram of first three figure.
Embodiment
Embodiment 1:(E)-4-(2-(1H-indoles-3-) vinyl)-1-picoline salt compounded of iodine (2c) synthetic
N-methyl-2-formyl radical pyrroles and N-hydroxyethyl-4-picoline are dissolved in methyl alcohol, get light yellow transparent solution, add 3～4 piperidines, the solution look that reddens rapidly.Back flow reaction 4h has the red-purple precipitation to separate out.Cooling is filtered, and washed with dichloromethane gets brown powder, productive rate 90%.
1H?NMR(300MHz,DMSO-d
6),δ(ppm):11.92(s,1H),8.68(d,J=7.0Hz,2H),8.24(d,J=16.2Hz,1H),8.16(dd,J=6.6,1.7Hz,1H),8.11(d,J=6.92Hz,2H),7.97(s,1H),7.51(dd,J=6.8,1.7Hz,1H),7.26(m,3H),4.18(s,3H).13C?NMR(400MHz,DMSO-d6),δ(ppm):154.62,144.62,137.96,136.69,132.71,125.36,123.38,122.08,121.59,120.90,117.29,114.02,113.05,46.74.HRMS(m/z):[M-I]+.Calcd?for?C16H15IN2,235.12;found,235.12。
Embodiment 2:HeLa, SiHa and H17702 cell cultures
With HeLa, SiHa and H17702 cell respectively adherent culture in including 10% foetal calf serum nutrient solution, at 37 ℃, 5%CO
2The saturated humidity incubator in cultivate, per 2～3d changes liquid and goes down to posterity 1 time.
Treat that cell grows into logarithmic phase, contact pin is cultivated: 1. cover glass is soaked 30min in dehydrated alcohol, put into disposable 35mm culture dish after the spirit lamp oven dry, and standby; 2. the cell that covers with in the 100mL cell bottle is given a baby a bath on the third day after its birth time with PBS, with 1mL0.25% trysinization 3-5 minute, pour out pancreatin carefully, add fresh medium piping and druming evenly and cell counting, with the addition control cell density of nutrient solution, making final concentration of cells is 1x10
5, in the above-mentioned culture dish that contains cover glass, put into 5%CO in being seeded to then
2Cultivate in the incubator, make the cell climbing sheet growth.
After treating the cell climbing sheet growth and covering with cover glass, be used for experiment.
Embodiment 3:(E)-(2-(1H-indoles-3-) vinyl)-1-picoline salt compounded of iodine (2c) is to HeLa, and the dyeing of SiHa and H17702 cell is observed for 4-
Embodiment 2 preparation covered with HeLa respectively, the cover glass of SiHa and H17702 cell (creep plate) is given a baby a bath on the third day after its birth time with PBS, is that (2-(1H-indoles-3-) vinyl)-1-picoline salt compounded of iodine fluorescent probe solution is at CO for (E)-4-of 20 μ M in order to the concentration of nutrient solution dilution then
2In the incubator, respectively to various cell dyeing 30min.
Creep plate after the dyeing is taken out, and the unconjugated unnecessary dye liquor of flush away, cell aufwuchsplate, are observed under fluorescent microscope and laser scanning co-focusing mirror on slide glass towards lower cover, coloring site in the record cell, fluorescence distribution and brightness flop etc.
The results are shown in Figure 1, Fig. 2.Fluoroscopic image is presented at tenuigenin and nucleolar zone has tangible green light distribution, clearly point out probe of the present invention can be in viable cell RNA in narrow spectrum imaging kytoplasm and the kernel.
Embodiment 4:(E)-4-(observe the dyeing of HeLa cell and the HeLa cell (RNase A digestion experiment) after rnase (RNase A) is handled by 2-(1H-indoles-3-) vinyl)-1-picoline salt compounded of iodine fluorescent probe
The fixed cell preparation: at first the cover glass that covers with the HeLa cell (creep plate) with embodiment 2 preparations is soaked in 4% paraformaldehyde solution 30min, perhaps use fixedly 15min of-20 ℃ of methyl alcohol, use the penetrating 2min of 0.5%Triton X-100 room temperature then, must fixed cell be dyeed.
Get above-mentioned two groups of fixed cells, wherein add 25mg/mL DNase-FreeRNase(GE in one group) in incubator, digest 2h; Then two groups of fixed cells are cleaned 3 times with PBS, and all to use concentration simultaneously be that (2-(1H-indoles-3-) vinyl)-1-picoline salt compounded of iodine fluorescent probe solution is at CO for (E)-4-of 20 μ M
2Hatching dyeing 30min in the incubator.
Creep plate after the dyeing is taken out, the unconjugated unnecessary dye liquor of flush away, the cell aufwuchsplate, is observed under the fluorescent microscope of wide field on slide glass towards lower cover, coloring site in the record cell, fluorescence distribution and brightness flop etc.
The results are shown in Figure 3, find that the fluorescence of the groups of cells microscopically after GE handles weakens than control group (without the GE treatment group), and fluorescence only focuses on nuclear area, and on kernel and tenuigenin, can't see fluorescence substantially.Because RNase can hydrolysis falls the RNA in the cell, therefore, from then on angle can confirm and verify the RNA of probe of the present invention in can the selective imaging cell.
Embodiment 5:(E)-(2-(1H-indoles-3-) vinyl)-1-picoline salt compounded of iodine (2c) and propidium iodide (PI) are to HeLa, and the common dyeing of SiHa and H17702 cell is observed for 4-
Embodiment 2 preparation covered with HeLa respectively, the cover glass of SiHa and H17702 cell (creep plate) is given a baby a bath on the third day after its birth time with PBS, is that (2-(1H-indoles-3-) vinyl)-1-picoline salt compounded of iodine fluorescent probe solution is at CO for (E)-4-of 20 μ M in order to the concentration of nutrient solution dilution then
2In the incubator, respectively to various cell dyeing 30min.And then give a baby a bath on the third day after its birth time with the various cells of PBS after to dyeing, be that the PI of 0.5 μ M is at CO in order to the concentration of PBS dilution
2In the incubator, respectively to various cell dyeing 15min.
Creep plate after the dyeing is taken out, and the unconjugated unnecessary dye liquor of flush away, cell aufwuchsplate, are observed under fluorescent microscope or laser scanning co-focusing mirror on slide glass towards lower cover, coloring site in the record cell, fluorescence distribution and brightness flop etc.
The results are shown in Figure 4, propidium iodide (PI) is a kind of traditional imaging apoptosis or the fluorescence dye that glows of non-viable non-apoptotic cell nuclear, after utilizing fluorescent probe of the present invention and propidium iodide (PI) to compare test, what the entoblast that red fluorescence is arranged of finding every PI mark did not have that fluorescent probe of the present invention sends has the green fluorescence (namely not having the entoblast of red fluorescence to send bright green fluorescence) of obvious difference with PI fluorescence, points out fluorescent probe of the present invention optionally kernel and the RNA of imaging viable cell.
Embodiment 6:(E)-4-(observe the common dyeing of H17702 cell with traditional core acid dye Hoechst, plastosome red (MTR) by 2-(1H-indoles-3-) vinyl)-1-picoline salt compounded of iodine (2c)
The cover glass that covers with the H17702 cell (creep plate) of embodiment 2 preparation is given a baby a bath on the third day after its birth time with PBS, is that (2-(1H-indoles-3-) vinyl)-1-picoline salt compounded of iodine fluorescent probe solution is at CO for (E)-4-of 20 μ M in order to the concentration of nutrient solution dilution then
2In the incubator, to cell dyeing 30min.And then give a baby a bath on the third day after its birth time with the cell of PBS after to dyeing, be that the Hoechst33342 of 5 μ M is at CO in order to the concentration of PBS dilution
2In the incubator to cell dyeing 30min.And then give a baby a bath on the third day after its birth time with the cell of PBS after to dyeing, be that the MTR of 0.5 μ M is at CO in order to the concentration of PBS dilution
2In the incubator to cell dyeing 30min.
Creep plate after the dyeing is taken out, and the unconjugated unnecessary dye liquor of flush away, cell aufwuchsplate, are observed under fluorescent microscope or laser scanning co-focusing mirror on slide glass towards lower cover, coloring site in the record cell, fluorescence distribution and brightness flop etc.
The results are shown in Figure 5, find not disturb mutually when fluorescent probe of the present invention and Hoechst33342, MTR dye altogether, the good compatibility of redying is arranged.
Claims (7)
1. indoles pyridine salt fluorescent probe that is used for viable cell RNA and kernel imaging, it is characterized in that: described fluorescent probe general structure is shown in (I):
Wherein: above-mentioned R
1, R
2Expression alkyl, hydroxyalkyl or ether.
2. be used for the indoles pyridine salt fluorescent probe of viable cell RNA and kernel imaging according to claim 1, it is characterized in that: described R
1Be hydrogen, C
1-6Alkyl, hydroxyalkyl or ether base, R
2Be C
1-4Alkyl or hydroxyalkyl.
As described in the claim 2 for the indoles pyridine salt fluorescent probe of viable cell RNA and kernel imaging, it is characterized in that: described R
1Expression hydrogen, R
2The expression methyl.
As described in the claim 3 for the indoles pyridine salt fluorescent probe of viable cell RNA and kernel imaging, it is characterized in that: described fluorescent probe is (E)-4-(2-(1H-indoles-3-) vinyl)-1-picoline salt compounded of iodine.
5. the described indoles pyridine salt fluorescent probe for viable cell RNA and kernel imaging of claim 1 is at mark or show the application that RNA and kernel distribute in viable cell.
6. the described application of indoles pyridine salt fluorescent probe in identification of cell life or death state for viable cell RNA and kernel imaging of claim 1.
7. as claim 5 or 6 described application, it is characterized in that: described cell is HeLa, SiHa or H17702 cell.
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