• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    Carbon dots with two-photon fluorescence imaging for efficient synergistic trimodal therapy

    2023-10-14 03:01:42YahuiZhangHaoyuXiaMengdieYangHairongLiFeishiShanYilongChenXueYueZhouyuWangXiaoqiYu
    Chinese Chemical Letters 2023年9期

    Yahui Zhang, Haoyu Xia, Mengdie Yang, Hairong Li, Feishi Shan,Yilong Chen, Xue Yue, Zhouyu Wang,?, Xiaoqi Yu,c,?

    a Department of Chemistry, School of Science, Xihua University, Chengdu 610039, China

    b Asymmetric Synthesis and Chiral technology Key Laboratory of Sichuan Province, Chengdu 610039, China

    c Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 61064, China

    Keywords:Carbon dots (CDs)Two-photon imaging Photothermal therapy (PTT)Type I photodynamic therapy (PDT)Synergistic trimodal anticancer therapy

    ABSTRACT Applying the fluorescent carbon dots as smart materials in anticancer therapy is of great interest.However, carbon dots for multimodal synergistic anticancer therapy, especially for the triple modality, is rarely reported.Herein, we successfully synthesized OCDs by citric acid and (1R,2S)-2-amino-1,2-diphenylethan-1-ol, which show aggregation-induced emission property and two-photon fluorescence imaging.Meanwhile, OCDs are ideal photosensitizers for photothermal therapy under 808 nm and Type I photodynamic therapy with white light.Hydroxyl radicals, generated by Type I photodynamic therapy based on OCDs can transform protumoral M2 macrophages into antitumoral M1 macrophages, which exhibited immunotherapy ability.The synergism trimodal of OCDs results in potent anticancer efficacy, showing great potential in cancer therapy.

    Photothermal therapy (PTT) and photodynamic therapy (PDT)have emerged as new modalities for cancer therapy because of their outstanding advantages such as spatiotemporal controllability, minimal invasiveness, high efficiency, and low toxicity [1-6].For PTT, photothermal agents (PTAs) can convert the input light energy into heat which can induce protein disruption and tumor cells death [7-9].While in PDT, photosensitizers (PSs) trigger the generation of reactive oxygen species (ROS), which can disrupt cellular membranes, proteins, and nucleic acids, thereby realizing effective treatment [10-14].According to the mechanism, PDT can be divided into two types: Type I involves an electron or proton transfer generating free radicals such as superoxide anion (?O2-) and hydroxyl radical (?OH), while Type II includes an energy transfer producing singlet oxygen (1O2) [1,12,15].It is important to point out that oxygen is necessary for the production of1O2in Type II PDT,but the tumor microenvironment is hypoxic [12,16,17].Therefore,Type I PDT is more advantageous in hypoxic tumor.Additionally,the antitumoral M1 macrophages (M1) exhibiting immunotherapy ability can be transformed from protumral M2 macrophages (M2)in the presence of?OH during Type I PDT process [18,19].Thus,Type ?PDT itself is a combination of photodynamic therapy and immunotherapy.

    Considerable efforts have been devoted to endowing carbon dots (CDs) with diverse properties to expand their application fields in anticancer therapy [20-28].CDs materials are excellent PTAs/PSs candidates for PTT and PDT, due to the unique properties and diverse functions [17,29-32].However, the single mode phototherapy (PTT or PDT alone) using CDs materials cannot always results in successful therapeutic outcome, as the high temperature and long-time irradiation during the therapy may lead to inflammation and thermal damage to the normal tissues nearby[4,10,11,33].To overcome the drawbacks of single-mode phototherapy (PTT or PDT) and enhance its efficacy, multiple therapy of CDs had been introduced [34].Commercially available PSs or anticancer drugs are introduced to form a combination therapy with CDs.Jiaet al.prepared Ce6-RCDs by covalently coupling red emissive CDs(PTAs) with Ce6 (PSs), which exhibited a much higher cancer therapy efficacy under a low laser power density [35].Duttaet al.prepared CDs with high reactive oxygen species (ROS) generation ability, which were developed to load the doxorubicin (DOX).The CDs-DOX system realized chemotherapy and PDT synergetic therapy [36].

    Fig.1.Synthetic route of OCDs and schematic diagram of synergistic PTT, Type I PDT and immunotherapy processes.

    Fig.2.(a) The transmission electron microscopy (TEM) of OCDs, inset: the high-resolution transmission electron microscopy (HRTEM) of OCDs.(b) The size distribution of OCDs.(c) The Fourier transform infrared spectroscopy (FTIR) of OCDs.(d) The X-ray diffraction (XRD) spectrum of OCDs.(e) The X-ray photoelectron spectroscopy (XPS) of OCDs.The high-resolution (f) C 1s XPS, (g) N 1s XPS, and (h) O 1s spectra of OCDs, respectively.

    These works achieved synergistic therapy based on CDs by introducing additional therapeutic agents, which increase the cost and complicate the preparation process.Simultaneous synergistic therapy with individual CDs has gradually attracted attention.Chenet al.proposed the carbon dots, which demonstrated an extremely high photothermal conversion efficiency of 77.6% and a high1O2quantum yield of 0.37 under a 660 nm light irradiation [37].However, CDs with superior Type ?PDT are still scarce [38].

    Herein, we designed and synthesized orange carbon dots(OCDs) by citric acid and (1R,2S)-2-amino-1,2-diphenylethan-1-ol as shown in Fig.1 to achieve trimodal therapy.The OCDs have good Type ? ROS generation ability and photothermal conversion ability, thus, simultaneously exhibiting three synergistic therapy modalities against cancer, which are PTT, Type ? PDT and immunotherapy.Also, aggregation-induced emission (AIE) performance and the two-photon imaging make up for the shortcoming of the short excitation wavelength of OCDs and realize nearinfrared (NIR) phototherapy excitation of OCDs.OCDs are very promising candidates for multimodel combination therapy.

    In this study, we strategically designed and prepared the OCDs by citric acid and (1R,2S)-2-amino-1,2-diphenylethan-1-ol as shown in Fig.S1 (Supporting information).The OCDs exhibit a uniform dispersion with an average size of 2.7 nm as confirmed by transmission electron microscopy (TEM) imaging (Fig.2a), which the size distribution range is 1.0~6.2 nm (Fig.2b).Meanwhile, the high-resolution TEM (HRTEM) image provides more detailed evidence for the crystalline structure of the OCDs.The lattice spacing is 0.12 nm (Fig.2a inset) which is different from that of graphene or graphene quantum dots [39,40].This is attributed to the preparation process of OCDs, which has great influence on the formation of lattice spacing of CDs.

    Fourier transform infrared spectroscopy (FT-IR) spectroscopy represents the functional groups of OCDs on the surface, as shown in Fig.2c.The peaks at 3640~3300, 1345~1279, 933 cm-1are assigned to the stretching vibration of O-H and the peak at 3500~3300, 3087~2851, 1764, 1708~1686 cm-1are assigned to the N-H, C-H, O-C=O and C=O groups, respectively.The stretching vibration peaks of C-N, C=N, C=C and C-C are at 1675~1641,1028~1000, 1606~1492 and 699~508 cm-1.The FTIR results show that the formation of OCDs conforms to the basic principles of organic synthesis, such as condensation, dehydration, ring-off, addition, cross-linking and carbonization [41].

    In addition, The OCDs exhibit relatively obvious diffraction peak near 20°~22° as confirmed by X-ray diffraction (XRD) spectrum, which confirms the existence of the carbon core structure as shown in Fig.2d [42,43].And the X-ray photoelectron spectroscopy (XPS) spectrum shows three characteristic peaks (Fig.2e),corresponding to C 1s (284.80 eV), N 1s (400.38 eV), O 1s (531.64 eV), and the elemental content of C, N, O is 93.48 %, 2.67 %, 3.85%, respectively.The high-resolution C 1s spectrum (Fig.2f) exhibitions five peaks at 284.80, 285.51, 285.93, 286.44 and 288.28 eV,which are assigned to C-C/C=C, C-N, C-O), C=N, and C=O, respectively.The N 1s spectrum (Fig.2g) reveals three different types of N: pyridinic N, pyrrolic N, and graphitic N, respectively.The O 1s shows two peaks at 531.46 and 533.09 eV, assigned to O=C and OC bonds, respectively (Fig.2h).The high-resolution spectra of C 1s,N 1s, and O 1s indicates that OCDs have various chemical groups,consistent with the analysis of FTIR.

    Fig.3.(a) Absorption and (b) photoluminescence spectra of OCDs.(c) Photoluminescence spectra of OCDs with different excitation wavelength.(d) Emission spectra of OCDs solid excited at 490 nm (red line) and 900 nm (black line).(e) Emission spectra and (f) the logarithmic plots of the emission integral of OCDs solid at different excitation intensities by 900 nm femtosecond pulsed laser light.CLSM images of 4T1 cells incubated with OCDs (10 μg/mL in DMEM): (g) bright field image, (h)λex = 490 nm, (i) λex = 900 nm.

    The absorption and photoluminescence (PL) spectra of OCDs were measured.The prepared OCDs have poor water solubility and are easily soluble in organic solvents.Therefore, DMSO is selected as a good solvent and water is used as a poor solvent to test the optical properties.As shown in Figs.3a and b, the absorption peak of the solution shows at 448 nm.The emission peak of OCDs in DMSO appears in the orange region at 580 nm and does not change with the excitation wavelength (Fig.3c).Interesting, with the water content increasing, a new emission peak appears at 480 nm, which achieves its maximum in intensity when the water fraction (fw) reaches 40%.When thefwis more than 60%, the emission peak of 480 nm almost disappears and the emission peak of 580 nm plays a dominant role (Fig.S2 in Supporting information).The system displays bright orange emission.When the water content is 99%, the absolute fluorescence quantum yield (φf(shuō)) of aggregated OCDs is as high as 10.30, showing typical AIE properties.

    Compared with one-photon imaging, two-photon fluorescence imaging excited by NIR laser displays better performance in terms of deeper penetration, lower photo damage, and higher signal-tonoise ratio.We are glad to find that OCDs have the ability of twophoton imaging and it can make up for the shortcoming of the short excitation wavelength of OCDs.The optimal excitation wavelength is determined.As can be seen from the Fig.S3 (Supporting information), OCDs can be excited by 800, 850, 900 and 1000 nm, respectively, among which 900 nm exciting light lead to the strongest florescence emission.The band shape and position are almost the same excited by 490 nm and 900 nm as shown in Fig.3d.Also, the PL intensity increases with increasing laser power with 900 nm excite.Moreover, relationship between PL intensity and power demonstrate exponential linear relationship (Figs.3e and f).Subsequently, the two-photon imaging capability of OCDs is validated at the cellular level.As shown in Fig.S4 (Supporting information), the fluorescence image of 4T1 cells indicates that the OCDs might localize at lysosome with a Pearson coefficient of 0.94.Meanwhile, signals of OCDs in 4T1 cell from two-photon imaging irradiated with 900 nm laser display almost identical distribution compared to that of one-photon imaging (490 nm) (Figs.3g-i).The two-photon imaging capability of OCDs under NIR-light excitation in aqueous solution, makes OCDs potential not only for bioimaging,but also for PTT under 808 nm.

    Fig.4.(a) PL spectra and (b) PL intensity net change at 532 nm for the DCFH indicator with OCDs upon wight light irradiation (10 mW/cm2), [DCFH]=1.0×10-6 mol/L, [OCD]=10 μg/mL.(c) Electron paramagnetic resonance spectrometer (EPR)to verify the production of ?OH.(d) The temperature image and (e) the temperature change curve of PBS and OCDs (10 μg/mL) under 808 nm laser irradiation (1 W/cm2).

    The fluorescent indicator 2′,7′-dichlorodihydrofluorescein(DCFH) was used to evaluate the total ROS generation ability.As shown in Figs.4a and b, when OCDs with DCFH-DA are irradiated by white light (10 mW/cm2), the fluorescence intensity at 532 nm increases dramatically, indicating the strong ability of OCDs to generate ROS under white light irradiation.To clarify the types of ROS, the commonly used1O2indicator 9,10-anthracenediylbis(methylene)-dimalonic acid (ABDA) is used.As shown in Fig.S5(Supporting information), the absorbance of ABDA hardly changes for OCDs, thereby indicating no1O2generation.Meanwhile, electron spin resonance (ESR) spectroscopy is employed.Four-line resonances at a 1:2:2:1 intensity is observed under laser irradiation at 490 nm, which directly confirmed?OH production (Fig.4c).These results directly indicates that OCDs belonged to Type I PSs and had an excellent ability to produce Type I ROS (?OH).Photothermal conversion capability is also tested.The temperature of the OCDs solution increases rapidly to 42.4 °C within 10 min under 808 nm laser radiation and reaches 45.6 °C at 20 min as shown in Figs.4d and e.Temperatures reaching 45 °C can lead to enhanced PDT efficiency.PTT could improve the oxygen supply in the tumor tissue through raising the blood flow rate, thus promoting the PDT effect, which conversely further eliminates the heat-resistant tumor cells in PTT [44,45].

    Fig.5.Fluorescence images by CLSM of 4T1 cells stained with (a) H2DCFDA.(b) DAPI, CD206 and CD80.(c) Calcein-AM/PI.Light for H2DCFDA and M2-M1 was white light;Light for Live and Dead was dual light radiation (white light+808 nm).

    Then we confirmed the combined effect of PDT, PTT and immunotherapy of OCD at the cellular level.Cytotoxicity of different concentrations of OCDs is shown in Fig.S6 (Supporting information).When the concentration of OCD is lower than 10 μg/mL,the cell survival rate is higher than 90%, illustrating non-toxic.In Fig.5a, 4T1 cells show a strong green fluorescence treated with OCDs under white light, indicating the presence of high levels of ROS.Comparatively, the other three groups of 4T1 cells have almost no green fluorescence or very weak fluorescence.?OH generated by OCDs under white light can continuously re-educate M2 to M1 macrophages, which can phagocytose tumor cells exhibiting immunotherapy feasibility.As expected, the cells treated with OCDs under white light significantly increase the expression of M1-related costimulatory molecules CD86 (red emission in Fig.5b),while decreasing the expression of CD206, a typical marker for the M2 phenotype (green emission in Fig.5b), suggesting the successful transformation of M2 to M1.Finally, we combine PDT, PTT and immunotherapy to achieve multimodal treatment of cancer cells.As shown in Fig.5c, 4T1 cells co-incubated with OCDs are almost apoptotic under white light (Type ?PDT) and 808 nm laser (PTT)radiation.Compared to the group PBS, group Light Only and OCDs Only, OCDs with dual light radiation display the highest red fluorescence and negligible green fluorescence, confirming that therapeutic synergism is the most effective in killing cancer cells.

    OCDs showed good effectin vitro, and then we studied PTT/PDT and immunotherapy synergistic therapy of OCDs in tumor bearing mice.The mice were randomly divided into four groups (n=5)when the volume of subcutaneously inoculated 4T1 tumor reached 40 mm3.The focus of this work was therapeutic effect of synergistic trimodal therapy.Intratumoral injection was used to evaluate the effectiveness of treatment [45,46].The mice were treated with intratumoral injection of PBS (group PBS, group Light Only)or OCDs (group OCDs Only, group OCDs+Light), followed with or without irradiation as shown in Fig.6a.As shown in Fig.6b(the corresponding tumor photographs) and 6c (the tumor growth curves), the tumor volume in the group PBS, group Light Only and group OCDs Only obviously increased.

    However, after white light (0.2 W/cm2, 2 min) and 808 nm irradiation (1 W/cm2, 10 min), the group OCDs+Light exhibited significant tumor growth inhibition, and tumor is controlled and somewhat or even completely disappeared.Importantly, their body weights were also recorded every two days and no significant change in all four groups was observed (Fig.6d), demonstrating the good biosafety of our PDT/PTT immunotherapy approach.These results were further confirmed by hematoxylin and eosin(H&E) staining (Fig.S7 in Supporting information) and complete blood panel and serum biochemistry test (Fig.S8 in Supporting information) after the synergistic therapy of OCDs.Then we observed that the proportion of M1 cells in the group OCDs+Light was almost 4.9 times than that of group PBS from dissected and analyzed of the tumors, confirming the participation of immunotherapy in the treatmentin vivo(Fig.6e).The above results indicate that the synergistic therapy of OCDs is effective and biofriendly.

    Fig.6.(a) Treatment schedule.(b) Representative tumor images from mice on the 14th day after treatment.(c) Tumor growth curves for all treated groups.(d)Weights of the tumors collected on day 14 of treatment.(e) Ratios of the M1 phenotype in tumor tissues after treatment with OCDs.Light: white light (0.2 W/cm2,2 min) and 808 nm irradiation (1 W/cm2, 10 min).

    In this study, OCDs is obtained by one-step synthesis using citric acid and (1R,2S)-2-amino-1,2-diphenylethan-1-ol as substrates.The OCDs demonstrate excellent optical properties, typical AIE property and two-photon fluorescence imaging.Moreover, OCDs exhibited excellent ability to generate type I ROS (?OH) with white light and good photothermal conversion ability under 808 nm irradiation.Type I PDT generated?OH can trigger the conversion of M2 cells to M1 cells, leading to immunotherapy.The AIE, two-photon imaging, PDT and PTT capabilities enable OCDs to be used in multimodal combination therapy of tumors.OCDs agent under light irradiation, effectively inhibited tumor growth and prolonged the life of in tumor-bearing mice, thus, demonstrates safe multimodal therapeutic results.Longer emission wavelength and targeting to tumors will become the focus of our future work.To explore the multi-mode synergistic therapy of CDs by intravenous injection.CDs are biocompatible and available to thein vivosystem and are expected for clinical treatment.

    Declaration of competing interest

    The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

    Acknowledgments

    This work was financially supported by the National Natural Science Foundation of China (Nos.21905021, U21A20308), Sichuan Science and Technology Support Program (Nos.2022NSFSC1269,2023NSF1977, 2023NSFSC0637, 2022ZYD0048, 2021ZDYF3218,2021YFG0291, 2021YFH0132), and Sichuan Students’ Platform for innovation and entrepreneurship training program (No.202210623013).

    Supplementary materials

    Supplementary material associated with this article can be found, in the online version, at doi:10.1016/j.cclet.2023.108197.

    av在线播放精品| 久久毛片免费看一区二区三区| 国产在线观看jvid| 久久中文看片网| 91av网站免费观看| 成人国语在线视频| 丰满少妇做爰视频| 午夜免费成人在线视频| 亚洲人成77777在线视频| 久久精品亚洲av国产电影网| 人人澡人人妻人| 国产亚洲av高清不卡| 国产野战对白在线观看| 叶爱在线成人免费视频播放| 国产97色在线日韩免费| 天天躁日日躁夜夜躁夜夜| 欧美日韩亚洲高清精品| 亚洲成av片中文字幕在线观看| 久久精品成人免费网站| 久久久久精品国产欧美久久久 | 国产精品麻豆人妻色哟哟久久| 99久久人妻综合| 少妇 在线观看| 老司机影院成人| 精品国产乱码久久久久久小说| 91麻豆av在线| 精品国产乱子伦一区二区三区 | 欧美日韩亚洲高清精品| 91成人精品电影| 久久精品aⅴ一区二区三区四区| 国产又色又爽无遮挡免| 欧美日韩中文字幕国产精品一区二区三区 | 免费女性裸体啪啪无遮挡网站| 久久九九热精品免费| 欧美另类亚洲清纯唯美| 91精品伊人久久大香线蕉| 真人做人爱边吃奶动态| 国产精品熟女久久久久浪| 欧美 日韩 精品 国产| 久久久久久久大尺度免费视频| 亚洲国产看品久久| 女人久久www免费人成看片| 最近最新中文字幕大全免费视频| 亚洲精品自拍成人| 久久天躁狠狠躁夜夜2o2o| 狠狠狠狠99中文字幕| 欧美成狂野欧美在线观看| 女人精品久久久久毛片| 精品欧美一区二区三区在线| 国产激情久久老熟女| 99久久99久久久精品蜜桃| 一级黄色大片毛片| 少妇粗大呻吟视频| 十八禁高潮呻吟视频| 少妇被粗大的猛进出69影院| 精品国产一区二区三区久久久樱花| 久久精品国产亚洲av高清一级| 亚洲黑人精品在线| 国产熟女午夜一区二区三区| 欧美日韩福利视频一区二区| 国产极品粉嫩免费观看在线| 日韩有码中文字幕| 一区二区av电影网| 在线av久久热| 精品久久蜜臀av无| 91麻豆av在线| 国产高清videossex| 成人18禁高潮啪啪吃奶动态图| 亚洲精品国产色婷婷电影| 黄色a级毛片大全视频| 免费一级毛片在线播放高清视频 | 亚洲欧美一区二区三区黑人| 男女免费视频国产| 亚洲精品中文字幕一二三四区 | 欧美黄色片欧美黄色片| 久久久精品免费免费高清| 日韩欧美一区视频在线观看| 在线观看免费视频网站a站| 亚洲精品一二三| 蜜桃在线观看..| 亚洲欧美色中文字幕在线| 99re6热这里在线精品视频| 99精国产麻豆久久婷婷| 黄片大片在线免费观看| 大片电影免费在线观看免费| 啦啦啦视频在线资源免费观看| 欧美日韩精品网址| 亚洲av成人不卡在线观看播放网 | 国产国语露脸激情在线看| 久久久精品94久久精品| 国产免费视频播放在线视频| 水蜜桃什么品种好| 自线自在国产av| 人妻 亚洲 视频| 亚洲精品美女久久av网站| bbb黄色大片| 黑人操中国人逼视频| 两性午夜刺激爽爽歪歪视频在线观看 | 黑人巨大精品欧美一区二区蜜桃| 国产在线观看jvid| 日本黄色日本黄色录像| 亚洲激情五月婷婷啪啪| 欧美国产精品一级二级三级| 欧美精品啪啪一区二区三区 | 女性生殖器流出的白浆| 天天添夜夜摸| 69精品国产乱码久久久| 亚洲精品国产色婷婷电影| 可以免费在线观看a视频的电影网站| 国产成人av教育| 日韩有码中文字幕| 欧美日韩成人在线一区二区| 欧美xxⅹ黑人| 欧美日韩亚洲综合一区二区三区_| 日韩,欧美,国产一区二区三区| 国产精品久久久人人做人人爽| 嫩草影视91久久| 热re99久久精品国产66热6| 男人舔女人的私密视频| 在线观看www视频免费| 天天躁夜夜躁狠狠躁躁| 久久国产精品男人的天堂亚洲| 久久精品国产亚洲av香蕉五月 | 99热网站在线观看| 黄色怎么调成土黄色| 丰满少妇做爰视频| 欧美精品啪啪一区二区三区 | 亚洲欧美精品综合一区二区三区| 少妇猛男粗大的猛烈进出视频| 人人妻人人澡人人看| 99久久国产精品久久久| 各种免费的搞黄视频| 成人国产av品久久久| 男女下面插进去视频免费观看| 欧美日韩亚洲综合一区二区三区_| 宅男免费午夜| 在线观看免费视频网站a站| 一区二区日韩欧美中文字幕| 成年动漫av网址| 免费在线观看完整版高清| 美女高潮到喷水免费观看| 亚洲精品国产精品久久久不卡| 中文字幕人妻丝袜一区二区| 亚洲视频免费观看视频| 久久久精品免费免费高清| 午夜影院在线不卡| av天堂在线播放| 男女无遮挡免费网站观看| 久久天堂一区二区三区四区| 国产av精品麻豆| 国产精品一区二区在线观看99| 午夜福利在线观看吧| 国产欧美日韩综合在线一区二区| 国产区一区二久久| 国产日韩一区二区三区精品不卡| 超碰97精品在线观看| 亚洲中文日韩欧美视频| 看免费av毛片| 中文字幕av电影在线播放| 高清欧美精品videossex| 国产免费视频播放在线视频| 午夜91福利影院| 亚洲精品国产av成人精品| 老司机深夜福利视频在线观看 | av欧美777| 欧美av亚洲av综合av国产av| 在线观看免费视频网站a站| 久久亚洲国产成人精品v| 日韩视频在线欧美| 欧美在线黄色| 午夜免费观看性视频| 午夜福利,免费看| 国产一区二区三区在线臀色熟女 | 国产一区二区三区av在线| 国产国语露脸激情在线看| 国产人伦9x9x在线观看| 午夜福利影视在线免费观看| av电影中文网址| 黑人巨大精品欧美一区二区mp4| 不卡av一区二区三区| 日韩免费高清中文字幕av| 无限看片的www在线观看| 麻豆乱淫一区二区| 日韩中文字幕欧美一区二区| 动漫黄色视频在线观看| 悠悠久久av| 免费黄频网站在线观看国产| 侵犯人妻中文字幕一二三四区| 亚洲一区中文字幕在线| 欧美日韩精品网址| 欧美精品高潮呻吟av久久| 日韩欧美一区二区三区在线观看 | 国产黄频视频在线观看| 人人妻人人澡人人看| 久久久国产一区二区| 国产高清videossex| 国精品久久久久久国模美| 国产成人a∨麻豆精品| 一本大道久久a久久精品| 手机成人av网站| 精品少妇一区二区三区视频日本电影| 午夜视频精品福利| 国产不卡av网站在线观看| 美女高潮到喷水免费观看| 大型av网站在线播放| 亚洲国产欧美一区二区综合| 中亚洲国语对白在线视频| 如日韩欧美国产精品一区二区三区| 国产成人av教育| 欧美大码av| 午夜福利视频精品| 欧美成人午夜精品| 日韩欧美国产一区二区入口| 日本精品一区二区三区蜜桃| 91av网站免费观看| 久久九九热精品免费| 美女主播在线视频| 爱豆传媒免费全集在线观看| 亚洲第一欧美日韩一区二区三区 | 19禁男女啪啪无遮挡网站| 美女大奶头黄色视频| 菩萨蛮人人尽说江南好唐韦庄| 久久人人爽av亚洲精品天堂| 中文字幕精品免费在线观看视频| 欧美日韩av久久| 亚洲国产成人一精品久久久| 国产免费av片在线观看野外av| 十八禁网站网址无遮挡| 一区二区日韩欧美中文字幕| 成人亚洲精品一区在线观看| 老司机影院毛片| 中亚洲国语对白在线视频| av片东京热男人的天堂| 久久综合国产亚洲精品| 国产精品熟女久久久久浪| 亚洲专区中文字幕在线| 午夜福利,免费看| 一级片免费观看大全| 欧美黄色淫秽网站| 精品一区二区三区av网在线观看 | 成年av动漫网址| 美女视频免费永久观看网站| 少妇 在线观看| 午夜免费观看性视频| 亚洲成av片中文字幕在线观看| 超色免费av| av片东京热男人的天堂| 久久国产亚洲av麻豆专区| 亚洲欧美日韩另类电影网站| 天天躁狠狠躁夜夜躁狠狠躁| 五月开心婷婷网| 热99re8久久精品国产| 久久久久精品国产欧美久久久 | 九色亚洲精品在线播放| 悠悠久久av| h视频一区二区三区| 亚洲精品第二区| 极品少妇高潮喷水抽搐| 日韩,欧美,国产一区二区三区| 国产黄色免费在线视频| 十分钟在线观看高清视频www| √禁漫天堂资源中文www| 91精品国产国语对白视频| 国产精品99久久99久久久不卡| 丰满饥渴人妻一区二区三| 久久精品熟女亚洲av麻豆精品| 大香蕉久久成人网| 久久影院123| 超碰成人久久| 欧美97在线视频| 天堂中文最新版在线下载| 国产极品粉嫩免费观看在线| 亚洲色图综合在线观看| 啦啦啦啦在线视频资源| 18禁国产床啪视频网站| 亚洲av日韩精品久久久久久密| 亚洲精华国产精华精| 欧美日韩福利视频一区二区| √禁漫天堂资源中文www| 亚洲欧美一区二区三区久久| 999久久久国产精品视频| 午夜福利,免费看| 电影成人av| av片东京热男人的天堂| 王馨瑶露胸无遮挡在线观看| 久久精品国产a三级三级三级| 美女高潮到喷水免费观看| 中文欧美无线码| 免费av中文字幕在线| 老司机亚洲免费影院| 悠悠久久av| 久久久精品免费免费高清| 成在线人永久免费视频| 国产一区二区三区av在线| 国产高清videossex| 欧美精品啪啪一区二区三区 | 欧美精品高潮呻吟av久久| 欧美黑人欧美精品刺激| 一级,二级,三级黄色视频| 人妻久久中文字幕网| 丰满少妇做爰视频| 悠悠久久av| 在线精品无人区一区二区三| a在线观看视频网站| 大片电影免费在线观看免费| 热99国产精品久久久久久7| 99国产极品粉嫩在线观看| 日本精品一区二区三区蜜桃| 这个男人来自地球电影免费观看| av天堂久久9| 欧美 日韩 精品 国产| 十八禁网站免费在线| 久久九九热精品免费| 亚洲欧洲精品一区二区精品久久久| 99热全是精品| 久久毛片免费看一区二区三区| 纵有疾风起免费观看全集完整版| 99久久国产精品久久久| 色播在线永久视频| 国产精品麻豆人妻色哟哟久久| 午夜福利在线免费观看网站| 久久久久久亚洲精品国产蜜桃av| 男男h啪啪无遮挡| av在线app专区| 精品国产乱码久久久久久男人| 欧美日韩一级在线毛片| 亚洲av成人一区二区三| av在线app专区| 成人亚洲精品一区在线观看| 久久这里只有精品19| netflix在线观看网站| 丝瓜视频免费看黄片| 成人亚洲精品一区在线观看| 在线观看免费日韩欧美大片| 久久综合国产亚洲精品| 男人舔女人的私密视频| 十八禁网站网址无遮挡| 嫁个100分男人电影在线观看| 国产亚洲午夜精品一区二区久久| 精品福利观看| 日韩 欧美 亚洲 中文字幕| 老司机影院毛片| 99热国产这里只有精品6| 亚洲国产精品一区三区| 久热爱精品视频在线9| 美女午夜性视频免费| 一个人免费在线观看的高清视频 | 亚洲第一欧美日韩一区二区三区 | 免费在线观看黄色视频的| 欧美大码av| av免费在线观看网站| 美女中出高潮动态图| 欧美日韩亚洲综合一区二区三区_| bbb黄色大片| 久久国产亚洲av麻豆专区| 国产成人欧美| 亚洲精品美女久久久久99蜜臀| 一区二区三区精品91| 青春草亚洲视频在线观看| 性色av一级| 久久久水蜜桃国产精品网| 两性夫妻黄色片| xxxhd国产人妻xxx| 纯流量卡能插随身wifi吗| www.av在线官网国产| 久久久国产成人免费| 脱女人内裤的视频| 12—13女人毛片做爰片一| 国产一区二区三区综合在线观看| 久久九九热精品免费| 亚洲色图综合在线观看| 一区福利在线观看| 国产av又大| 在线观看舔阴道视频| 青春草视频在线免费观看| 99精国产麻豆久久婷婷| 日本wwww免费看| 欧美人与性动交α欧美软件| 亚洲第一av免费看| 国产精品成人在线| 亚洲成人手机| 亚洲欧美日韩另类电影网站| 国产淫语在线视频| 亚洲精华国产精华精| 天堂8中文在线网| av在线app专区| av网站免费在线观看视频| 国产日韩一区二区三区精品不卡| 免费在线观看影片大全网站| 色94色欧美一区二区| 在线av久久热| 亚洲欧美精品综合一区二区三区| kizo精华| 99精品久久久久人妻精品| 亚洲欧美一区二区三区久久| 男人添女人高潮全过程视频| 久久天躁狠狠躁夜夜2o2o| 91老司机精品| 国产高清视频在线播放一区 | 99久久精品国产亚洲精品| 99国产精品一区二区三区| 80岁老熟妇乱子伦牲交| 国产欧美日韩一区二区精品| 丝袜美足系列| 日韩 欧美 亚洲 中文字幕| 亚洲激情五月婷婷啪啪| 久久综合国产亚洲精品| 乱人伦中国视频| 老司机影院毛片| 午夜激情久久久久久久| 一二三四在线观看免费中文在| 精品一品国产午夜福利视频| 最新的欧美精品一区二区| 国产成人免费无遮挡视频| 18禁观看日本| 亚洲成人国产一区在线观看| 欧美精品人与动牲交sv欧美| 国产精品欧美亚洲77777| av不卡在线播放| 久久精品aⅴ一区二区三区四区| 中文字幕人妻熟女乱码| 亚洲人成电影观看| 丁香六月欧美| 亚洲精品国产区一区二| 国产欧美亚洲国产| 久久九九热精品免费| 脱女人内裤的视频| 日本五十路高清| 免费观看av网站的网址| 亚洲伊人久久精品综合| 一区二区三区乱码不卡18| 午夜精品国产一区二区电影| 视频区欧美日本亚洲| 久久精品国产亚洲av高清一级| 中文精品一卡2卡3卡4更新| 亚洲自偷自拍图片 自拍| 在线观看人妻少妇| 欧美激情高清一区二区三区| 久久久精品国产亚洲av高清涩受| 在线观看舔阴道视频| 国产日韩欧美在线精品| 成年美女黄网站色视频大全免费| 操美女的视频在线观看| 一区二区三区乱码不卡18| 国产又色又爽无遮挡免| 中文字幕另类日韩欧美亚洲嫩草| 18禁裸乳无遮挡动漫免费视频| 王馨瑶露胸无遮挡在线观看| 无遮挡黄片免费观看| 国产三级黄色录像| tocl精华| 啦啦啦视频在线资源免费观看| 精品人妻1区二区| 国产精品久久久久久人妻精品电影 | 丰满少妇做爰视频| 午夜福利乱码中文字幕| 两性夫妻黄色片| 9191精品国产免费久久| 一个人免费看片子| 纵有疾风起免费观看全集完整版| 中文字幕最新亚洲高清| 12—13女人毛片做爰片一| 亚洲人成77777在线视频| 久久精品成人免费网站| 欧美日韩亚洲国产一区二区在线观看 | 女人高潮潮喷娇喘18禁视频| 纵有疾风起免费观看全集完整版| 淫妇啪啪啪对白视频 | 色婷婷久久久亚洲欧美| 十八禁网站网址无遮挡| 操出白浆在线播放| 天天躁日日躁夜夜躁夜夜| 国产又爽黄色视频| 国产一区二区三区av在线| 精品一区二区三区av网在线观看 | 免费av中文字幕在线| 黑人巨大精品欧美一区二区mp4| 国产一区二区三区综合在线观看| 99热网站在线观看| 日韩中文字幕欧美一区二区| 国产欧美亚洲国产| 日韩中文字幕视频在线看片| 欧美 亚洲 国产 日韩一| 国产精品国产av在线观看| 热99re8久久精品国产| 一边摸一边抽搐一进一出视频| 午夜福利视频在线观看免费| 国产精品二区激情视频| 国产一区二区三区av在线| 91精品伊人久久大香线蕉| 少妇精品久久久久久久| 成年美女黄网站色视频大全免费| 正在播放国产对白刺激| 亚洲精品国产av蜜桃| 亚洲国产欧美一区二区综合| 午夜免费鲁丝| 国产高清视频在线播放一区 | 女警被强在线播放| 亚洲欧美一区二区三区久久| 日本91视频免费播放| 欧美精品一区二区大全| 午夜日韩欧美国产| 少妇精品久久久久久久| 老鸭窝网址在线观看| 淫妇啪啪啪对白视频 | 日韩视频在线欧美| 18在线观看网站| 日日夜夜操网爽| 欧美黑人精品巨大| tocl精华| a级毛片黄视频| 国产在线观看jvid| 久久精品亚洲av国产电影网| 啦啦啦中文免费视频观看日本| 天天躁狠狠躁夜夜躁狠狠躁| 国产精品久久久久久人妻精品电影 | 大片免费播放器 马上看| 波多野结衣av一区二区av| 18在线观看网站| 午夜日韩欧美国产| 人妻 亚洲 视频| 最新在线观看一区二区三区| 国产无遮挡羞羞视频在线观看| 99国产综合亚洲精品| 成人影院久久| 97在线人人人人妻| 欧美日韩一级在线毛片| 九色亚洲精品在线播放| 国产欧美日韩精品亚洲av| av网站在线播放免费| 欧美乱码精品一区二区三区| 日本精品一区二区三区蜜桃| 国产精品亚洲av一区麻豆| 麻豆乱淫一区二区| 亚洲av日韩精品久久久久久密| 国产精品免费大片| 精品人妻一区二区三区麻豆| 国产精品久久久久久人妻精品电影 | 一级a爱视频在线免费观看| 精品久久久久久久毛片微露脸 | 满18在线观看网站| 久久国产精品人妻蜜桃| 亚洲成人免费av在线播放| 丝袜人妻中文字幕| 99国产精品99久久久久| 日韩视频在线欧美| 国产黄频视频在线观看| 高清在线国产一区| 欧美 日韩 精品 国产| 黄色视频,在线免费观看| 欧美国产精品一级二级三级| 99热全是精品| 日韩欧美免费精品| 国产免费视频播放在线视频| 美女午夜性视频免费| 国产熟女午夜一区二区三区| 国产老妇伦熟女老妇高清| 国产不卡av网站在线观看| 日本vs欧美在线观看视频| 亚洲 国产 在线| av网站免费在线观看视频| 手机成人av网站| 日本a在线网址| 夜夜骑夜夜射夜夜干| 99精品欧美一区二区三区四区| 国产人伦9x9x在线观看| 日本欧美视频一区| 十分钟在线观看高清视频www| 亚洲精品成人av观看孕妇| 伊人亚洲综合成人网| 91九色精品人成在线观看| www.av在线官网国产| 黄片播放在线免费| 青春草视频在线免费观看| 自拍欧美九色日韩亚洲蝌蚪91| 乱人伦中国视频| av福利片在线| 老司机靠b影院| 制服诱惑二区| 妹子高潮喷水视频| 国产精品 国内视频| 777久久人妻少妇嫩草av网站| 亚洲精品美女久久久久99蜜臀| 亚洲精品乱久久久久久| 国产深夜福利视频在线观看| 久久精品亚洲av国产电影网| 亚洲精品一卡2卡三卡4卡5卡 | 亚洲性夜色夜夜综合| 精品卡一卡二卡四卡免费| 捣出白浆h1v1| 亚洲 欧美一区二区三区| 久久久国产欧美日韩av| 亚洲精华国产精华精| 亚洲国产精品成人久久小说| 精品久久久久久久毛片微露脸 | 在线 av 中文字幕| 亚洲国产精品999| 国产亚洲午夜精品一区二区久久| 搡老岳熟女国产| 国产男人的电影天堂91| 精品亚洲乱码少妇综合久久| 99久久国产精品久久久| 欧美日韩黄片免| 成人黄色视频免费在线看| 99热全是精品| 汤姆久久久久久久影院中文字幕| 下体分泌物呈黄色| 香蕉丝袜av| 国产成人a∨麻豆精品| 日韩欧美一区二区三区在线观看 | 欧美国产精品一级二级三级| 一个人免费看片子| 中文字幕色久视频| 国产成人系列免费观看| 爱豆传媒免费全集在线观看|