The Protective Effect of a Human Umbilical Cord Mesenchymal Stem Cell Supernatant on UVB-Induced Skin Photodamage.

The skin is constantly exposed to a range of environmental stressors, including ultraviolet (UV) radiation, which can cause damage to the skin. Repairing UV-damaged skin has been a major focus of research in recent years. The therapeutic potential of human umbilical cord mesenchymal stem cells (HUCMSCs) exhibits anti-photoaging properties. In this study, we developed a strategy for concentrating an HUCMSC supernatant, and examined the protective effects of CHS on UVB exposure in vitro and in vivo. Our results demonstrate that CHS repairs UVB exposure by promoting cell viability and migration and reducing senescent and apoptosis cells. We further found that the photoprotective effect of CHS is due to autophagy activation. Moreover, CHS reduces wrinkles and senescent cells, increases collagen expression, and improves immune function in UVB exposure-induced skin damage. In summary, our study provides a new approach for repairing cell damage, and suggests that CHS might be a potential candidate for preventing UVB-induced skin photodamage.

Mid1ip1b modulates apical reorientation of non-centrosomal microtubule organizing center in epithelial cells.

In most kinds of animal cells, the centrosome serves as the main microtubule organizing center (MTOC) that nucleates microtubule arrays throughout the cytoplasm to maintain cell structure, cell division and intracellular transport. Whereas in epithelial cells, non-centrosomal MTOCs are established in the apical domain for generating asymmetric microtubule fibers and cilia in epithelial cells for the organ morphogenesis during embryonic development. However, the mechanism by which MTOCs localize to the apical domain in epithelial cells remains largely unknown. Here, we show that Mid1ip1b has a close interaction with γ-tubulin protein, the central component of MTOC, and modulates lumen opening of the neural tube, gut, intestine, and kidney of zebrafish. Knockdown or dominant negative effect of Mid1ip1b resulted in failure of lumen formation of the organs as aforementioned. Moreover, the non-centrosomal MTOCs were unable to orientate to the apical domain in Mid1ip1b knockdown epithelial cells, and the centrosomal MTOCs were inaccurately placed in the apical domain, resulting in defective formation of asymmetric microtubules and misplacement of cilia in the apical domain. These data uncover a molecule that controls the proper localization of MTOCs in the apical domain in epithelial cells for organ morphogenesis during embryonic development.

A zebrafish mosaic assay to study mammalian stem cells in real time in vivo.

The differentiation potentials of stem cells have been evaluated by various in vivo and in vitro assays. However, these assays have different limitations hindering efficient study of mammalian stem cells. Here we describe a rapid and powerful mosaic assay to study the differentiation potentials of stem cells in real time in vivo by using zebrafish embryo. We transplanted mouse neural stem cells into zebrafish embryos at different developmental stages and found that they mainly formed neural tissues while occasionally trans-differentiated into mesoderm- and endoderm-derived tissues. Because zebrafish embryo is transparent, the behaviors of transplanted mouse stem cells can be easily tracked in a real-time manner and at single-cell resolution. We expect that this assay may be widely applied to explore the in vivo behaviors of any stem cells available.

Efficacy and safety of bone marrow cell transplantation for chronic ischemic heart disease: a meta-analysis.

BACKGROUND: Although bone marrow-derived cells (BMCs) have shown great therapeutic potential in patients with chronic ischemic heart disease (CIHD), the exact efficacy and safety of BMCs therapy is still not completely defined. MATERIAL/METHODS: We searched PubMed, OVID, EMBASE, the Cochrane Library, and ClinicalTrials.gov and finally identified 20 qualified trials in this meta-analysis. Assessment of efficacy was based on left ventricular ejection fraction (LVEF), left ventricular end-systolic volume (LVESV), and left ventricular end-diastolic volume (LVEDV) improvement, by weighted mean difference (WMD) with 95% confidence intervals (CIs). RESULTS of all-cause death, ventricular arrhythmia, recurrent myocardial infarction, and cerebrovascular accident were pooled to assess safety. Subgroup analysis was performed by stratifying RCTs into 2 subgroups of those with revascularization and without revascularization. RESULTS: BMC transplantation significantly improved LVEF in patients with revascularization (3.35%, 95% CI 0.72% to 5.97%, p=0.01; I2=85%) and without revascularization (3.05%, 95% CI 0.65% to 5.45%, p=0.01; I2=86%). In patients without revascularization, BMC transplantation was associated with significantly decreased LVESV (-11.75 ml, 95% CI -17.81 ml to -5.69 ml, p=0.0001; I2=81%), and LVEDV (-7.80 ml, 95% CI -15.31 ml to -0.29 ml, p=0.04; I2=39%). Subgroup analysis showed that the route of transplantation, baseline LVEF, and type of cells delivered could influence the efficacy of BMC transplantation. CONCLUSIONS: Autologous transplantation of BMCs was safe and effective for patients who were candidates for revascularization with CABG/PCI and those who were not. However, large clinical trials and long-term follow-up are required to confirm these benefits.

Low-dose paclitaxel improves the therapeutic efficacy of recombinant adenovirus encoding CCL21 chemokine against murine cancer.

Secondary lymphoid tissue chemokine (SLC/CCL21), one of the CC chemokines, exerts potent antitumor immunity by co-localizing T cells and dendritic cells at the tumor site and is currently tested against human solid tumors. Here, we investigated whether the combination of recombinant adenovirus encoding murine CCL21 (Ad-mCCL21) with low-dose paclitaxel would improve therapeutic efficacy against murine cancer. Immunocompetent mice bearing B16-F10 melanoma or 4T1 breast carcinoma were treated with either Ad-mCCL21, paclitaxel, or both agents together. Our results showed that Ad-mCCL21 + low-dose paclitaxel more effectively reduced the growth of tumors as compared with either treatment alone and significantly prolonged survival time of the tumor-bearing animals. These antitumor effects of the combined therapy were linked to altered cytokine network at the tumor site, enhanced apoptosis of tumor cells, and decreased formation of new vessels in tumors. Importantly, the combined therapy elicited a strong therapeutic antitumor immunity, which could be partly abrogated by the depletion of CD4(+) or CD8(+) T lymphocytes. Collectively, these preclinical evaluations may provide a combined strategy for antitumor immunity and should be considered for testing in clinical trials.

[Lumen morphogenesis and molecular mechanisms in tubular organs during zebrafish embryonic development].

A network tubular system is an important structure in the body and organ of metazoa. The lumen of tube is fundamental units in the structure, which serve to transport material, divide the organ into different functional compartments and separate the organ from the environment. The defects of lumen formation will lead to abnormalities of the organ morphogenesis and disorder of the function. Zebrafish (Danio rerio)is an important model for development research. Meanwhile easy observation of tubular organ, the relevant mutants, and transgene linages make zebrafish to become an excellent model to study the formation of lumen in the tubular organs, including the blood vessels, neural tube, gut, exocrine pancreas, and pronephric duct, which undergo the typical morphogenesis of lumen that is involved in the organs' development. The process of lumen formation is mainly consisted of induction of extracellular signals, polarization of epithelial cell, directional transportation in the polar cells, the aggregation and transportation of fluid in the lumen, and the reconstruction of cytoskeleton in polar cells and controlled by the precise and complicated molecular networks during embryonic development. This review will summarize our current knowledge on lumen morphogenesis in four kinds of typical tubular organs during zebrafish embryonic development and the related molecular mechanisms as well as to supply helpful reference to the future studies.

Proteomic analysis of interstitial fluid in bone marrow identified that peroxiredoxin 2 regulates H(2)O(2) level of bone marrow during aging.

Hematopoiesis in bone marrow declines during aging owing to alteration of the hematopoietic niche. However, due to difficult accessibility and other complexities, senescence-related alteration of the hematopoietic niche is largely unknown. The interstitial fluid of bone marrow (IFBM), a pivotal component of the hematopoietic niche, includes soluble secretory factors that are present between bone marrow cells. To characterize the proteomic profile changes of IFBM during aging, we analyzed the IFBMs of young, adult, and senescent rats using 2-DE combined with ESI/MALDI-Q-TOF MS. Finally, 31 differentially expressed proteins involved in multiple biological functions were identified. Peroxiredoxin 2 (Prx2), down-regulated during aging, was further analyzed and demonstrated that it is produced by bone marrow stromal cells. Interestingly, higher levels of hydrogen peroxide (H(2)O(2)) were detected in the bone marrow with lower Prx2 expression. Moreover, exogenous Prx2 reduced the intracellular H(2)O(2) level in bone marrow stromal cells in vitro. Therefore, Prx2 is implied in the regulation of H(2)O(2) production in the bone marrow during aging. Our data characterized the dynamic protein profiles of the bone marrow microenvironment during aging and we provided clues to elucidate the mechanism of creating a low ROS level in the hematopoietic niche.

Suppression of human MDA-MB-435S tumor by U6 promoter-driven short hairpin RNAs targeting focal adhesion kinase.

PURPOSE: Focal adhesion kinase (FAK) is a non-receptor protein tyrosine kinase implicated in cancer cell survival, proliferation, and in various steps in the metastatic cascade. In the present study, we took advantage of a cationic liposome as gene carrier and targeted FAK function through both in vitro and in vivo approaches. METHODS: We utilized a plasmid-encoded hairpin RNA targeting the human FAK mRNA (pGensil2-shRNA/FAK), as a means to inhibit FAK expression for evaluating its anti-tumor effect in vitro and in vivo. Human MDA-MB-435S breast cancer cells were transfected with pGensil2-shRNA/FAK and examined for apoptosis by propidium iodide staining, DNA ladder, and flow cytometric analysis. For in vivo study, subcutaneous breast carcinomatosis models in nude mice were established to evaluate the therapeutic potential of pGensil2-shRNA/FAK. Assessments of proliferation (Ki-67), apoptosis (TUNEL) and angiogenesis (CD31) were done using immunohistochemical analysis. RESULTS: Transcripts expressed from plasmid both in vitro and in vivo were identified by northern blot analysis. pGensil2-shRNA/FAK effectively down-regulated the expression of FAK as demonstrated in vitro by real time RT-PCR and western blot analysis, whereas by real time RT-PCR and IHC staining of MDA-MB-435S tumors growing subcutaneously. Breast cancer cells lacking FAK expression undergo apoptosis in vitro. Systemic delivery of cationic liposome-complexed plasmids targeting FAK, resulted in the diminishment of subcutaneous tumor growth beyond the effects observed with liposomes carrying a non-specific shRNA. This diminishment in growth was associated with elevated levels of apoptosis (TUNEL staining), decreased cell proliferation (Ki-67 staining) and diminished endothelial cell density (CD31 staining). CONCLUSION: These results indicate that the systemic delivery of plasmid DNA targeting FAK function using cationic liposome as a gene carrier, represents a promising avenue for breast cancer therapy.

Synergistic effects of FGF-2 and PDGF-BB on angiogenesis and muscle regeneration in rabbit hindlimb ischemia model.

Combinatorial strategy has been used in therapeutic angiogenesis in animal models of peripheral arterial disease (PAD) and coronary artery disease for decades. Previous studies have shown that basic fibroblast growth factor (FGF-2) and platelet-derived growth factor BB (PDGF-BB) proteins together establish functional and stable vascular networks on mouse corneal and also in animal model of hindlimb ischemia. However, the short half life of protein by single injection is not sufficient to achieve effective dosage, repeated and prolonged injection causes systemic toxicity. Here we study the synergistic effects of FGF-2 and PDGF-BB by intramuscular injection of naked plasmid DNA on therapeutic angiogenesis in rabbit model of hindlimb ischemia. We found that transient delivery of FGF-2 and PDGF-BB naked DNA together resulted in greater increases in capillary growth, collateral formation and popliteal blood flow compared with control and single gene delivery. Our data provided novel evidence of beneficial effects of DNA-based FGF-2 and PDFG-BB on muscle repair after ischemic injury. These findings reveal an alternative therapeutic approach in the treatment of ischemic diseases and even in muscular disorders.

[Construction of recombinant adenovirus containing full-length sense and antisense cyclin B1 cDNA and their impact on proliferation and apoptosis of HeLa cells].

OBJECTIVE: To construct a recombinant adenovirus vector carrying the full-length sense and antisense cyclin B1 cDNA of human, and to investigate the influence of the recombinant adenoviruses on the cultured human cervical carcinoma cell line HeLa. METHODS: The recombinant adenovirus vectors were constructed by homologous recombination technique. The recombinant adenoviruses were packaged and amplified in 293A cells. Then the recombinant adenoviruses were used to infect HeLa cells. The influence was determined by cell counting and flow cytometry. RESULTS: The HeLa cells infected with antisense recombinant adenovirus exhibited significant cell apoptosis and growth inhibition compared to the normal HeLa cells and the cells infected with sense recombinant adenovirus. CONCLUSION: Recombinant adenoviruses vectors containing the full-length sense and antisense cDNA of human cyclin B1 is successfully constructed, which has laid a foundation for further studies on its anticancer functions.

CXC-chemokine-ligand-10 gene therapy efficiently inhibits the growth of cervical carcinoma on the basis of its anti-angiogenic and antiviral activity.

Epidemiological studies have demonstrated that high-risk human papillomavirus (HPV) is involved in causing cervical carcinoma. The HPV oncoproteins E6 and E7 immortalize human keratinocytes is mostly resulted from inactivation of tumor suppressor proteins p53 and pRB, which also play an important role in regulating the expression of pro- and antiangiogenic factors. The present study was conducted to determine whether IFN--inducible protein 10 (IP-10)/CXC chemokine ligand 10(CXCL10), one of the potent antiangiogenic chemokines, can inhibit the growth of cervical cancer. Plasmid DNA encoding CXCL10 was encapsulated with cationic liposomes, mice were treated with DNA-liposome mixture 6 times with the 5-day interval. Our results demonstrated that CXCL10 could reduce the level of HPV oncoproteins E6 and E7 in cervical cancer cells. In vivo study showed that CXCL10 could inhibit the growth of tumor in the immunodeficiency mice. Immunohistology analysis revealed that CXCL10 downregulated the microvessel density and the expression of PCNA in tumor tissues. TUNEL staining demonstrated CXCL10 significantly increase the apoptotic rate. Our data suggest that CXCL10 can inhibit the growth of cervical carcinoma through modulating the formation of microvessel and the expression of HPV oncoproteins E6 and E7. The present findings also provide further evidence of the anti-tumor effects of CXCL10, and may be of importance for the further exploration of the potential application of this molecule in the treatment of cervical carcinoma.

[Cancer stem cell theory and cancer therapy].

OBJECTIVE: To analyze the advances of cancer stem cell (CSC) in recent years, and to propose a prospect for CSC research and cancer therapy. METHODS: Articles about important advances of CSC theory and cancer therapy were reviewed, and then selected and summarized. RESULTS: In 2001, CSC was first put forward as a concept, till now, which has been confirmed in many tissues. In recent years, efforts were dedicated to such topics including: identification of CSC in solid tumors, the origin of CSC, its niche and growth mechanism, cancer therapy, etc. According to the CSC theory, traditional therapeutic methods have deficiencies, and new treatment targeting CSC may thoroughly eliminate tumors. CONCLUSION: At present, CSC theory is still controversial, while it proposed revolutionary methods and directions for the therapy of cancer.

[Experimental study on culture of human mesenchymal stem cells from cord blood using autologous serum].

In this study, we collected human umbilical cord blood and separated the autologous serum and clear cells. Then the human mesenchymal stem cells were cultured with the use of autologous serum and fetal serum, respectively. By identifing surface markers with flow cytometry and testing the osteogenic, adipogenic and cardiomyocytes differentiation capacity of the cells, we affirmed that the cultured cells are mesenchymal stem cells. Among 21 cases of umbilical cord blood, 11 cases using fetal bovine serum and 15 cases using autologous successfully cultured mesenchymal stem cells from umbilical cord blood. The UCB-MSCs did not express CD34 and CD45, but they expressed CD29, CD44 and CD105, and they were successfully induced into osteogenic cells, adipogenic cells and cardiomyocytic-like cells. All of these suggest that using autologous serum to culture UCB-MSCs is better than using fetal bovine serum, and the autologous serum cultured UCB-MSCs can also be induced into osteogenic cells, adipogenic cells cardiomycyote-like cells.

Synergistic antitumor effect of CXCL10 with hyperthermia.

PURPOSE: IFN-inducible protein 10 (IP-10)/CXCL10 (CXC chemokine ligand 10) has been described as an antiangiogenic chemokine and displays a potent antitumor activity in vivo. In the present study, we try to investigate whether the combination therapy of hyperthermia, a physical antiangiogenic modality, with CXCL10 would completely eradicate the established solid tumors. METHODS: Immunocompetent BALB/c mice bearing Meth A fibrosarcoma were established. Mice were treated with either CXCL10 at 25 microg/kg once a day for 20 days, hyperthermia was given twice (at 42 degrees C for 1 h, on day 6 and 12 after the initiation of CXCL10), or together. Tumor volume and survival time were observed. The microvessel density was determined by CD31 immunofluorescence. Histologic analysis and assessment of apoptotic cells were also conducted in tumor tissues. RESULTS: The results showed that CXCL10 and hyperthermia inhibited the growth of Meth A fibrosarcoma and interestingly, the combination therapy enhanced the antiangiogenic effects and completely eradicated the established solid tumors. Histological examination revealed that CXCL10 + hyperthermia led to increased induction of apoptosis, tumor necrosis, and elevated lymphocyte infiltration compared with the controls. Moreover, the tumor eradicated animals developed a protective T-cell-dependent antitumor memory response against Meth A tumor cells rechallenge. CONCLUSIONS: Our finding is that the combination therapy can achieve a synergistic antitumor efficacy, supporting the idea that the combination of two antiangiogenic agents may lead to improved clinical outcome. These findings could open new perspectives in clinical antitumor therapy.

[Construction of recombinant adenovirus vector carrying secondary lymphoid organ chemokine].

OBJECTIVE: To construct a recombinant adenovirus vector carring the SLC gene for further studies on gene therapy for carcinoma. METHODS: The SLC gene was amplified from the pORF5 vector with polymerase chain reaction (PCR) technique. The amplified gene was cloned into the pENTR11 vector. With the pENTR11-SLC plasmid and the backbone plasmid pAd/CMV/V5-DEST, the homologous recombination reaction took place in vitro. The reaction mixture was transferred into TOP10 E. coli strains (without F' episome). The recombination adenovirus plasmid was then generated. The recombinant adenoviruses were packaged and amplified in 293A cells. RESULTS: The SLC gene was successfully cloned into the pAd/CMV/V5-DEST plasmid and the recombinant adenoviruses carrying SLC gene were detected by PCR, with a viral titer of 2. 6 X 10(8) pfu/mL. CONCLUSION: The constructed recombinant adenovirus can introduce SLC gene into tumor tissues, which provides a foundation for the study of antitumor efficacy of SLC.

[Cloning, expression, distribution and subcellular localization of AK078438 gene].

OBJECTIVE: To investigate the molecular cloning, tissue distribution, tumor distribution and the subcellular localization of AK078438 gene. METHODS: Reverse transcriptase-polymerase chain reaction (RT-PCR) technique was applied to amplify the open reading frame of AK078438 gene. Prokaryotic expressing vector and affinity purification were used to get the fusion protein. At mRNA expressing levels semi-quantitative RT-PCR was employed for the investigation of its distribution in normal rat tissues, tumor cell and mesenchymal stem cell (MSC) lines. The eukaryotic expression green fluorescence protein (GFP) fusion protein vector was transfected into cells and identified subcellular localization. RESULTS: The full open reading frame of AK078438 gene with 1065 bp, 355aa were identified. mRNA of the gene distributed in brain, uterus, colon, bone marrow, testis and kidney, but not in stomach, liver, the lung, spleen and heart. Murine colon adenocarcinoma C26, melanoma B16, Lewis lung carcinoma LL/2 and MSC had the gene and mouse myeloma cell line NS-1 and Hepa mouse hepatoma cell line had no the gene. The protein was localized in cytoplasm. CONCLUSION: Protein expression, expressing profile and subcellular localization of AK078438 gene set the basis for further exploration of its functions.

[Isolation and purification of BMScs of GFP transgenic mouse using the method of adhering to cuture plastic in different time].

OBJECTIVE: To adopt the method of adhering to culture plastic in different time for cultivating and purifying BMSCs of green fluorescent protein (GFP) transgenic mice. METHODS: Bone marrow cells isolated from GFP transgenic mice are directly planted in culture flask and an exchange of the total volume medium is made at different time. Then the cells adhering to culture plastic are differently counted according to the cell types and are examined by immunohistochemistry using the antibodies of CD44, CD45 and CD54 in three days. Moreover, the cells after the exchange of the total volume medium in 4 hours, 8 hours and 24 hours are selected and successively subcultured down to the fifth passage. Then the result of amplification is calculated and the cells are examined by immunohistochemistry using the antibodies of CD44, CD45 and CD54. RESULTS: With the extending of the time for the first exchange of medium, the density of cells adhering to culture plastic increased accordingly, but the BMSCs proportion decreased. The cells after first exchange of medium in 4 hours had high BMSCs proportion but low BMSCs density, and the cells in 24 hours had high BMSCs density and low BMSCs proportion. However, the cells in 8-10 hours had high BMSCs density and also high BMSCs proportion. The subcultured BMSCs could stably express GFP. CONCLUSION: The method of adhering to culture plastic in different time for cultivating and purifying BMSCs of GFP transgenic mice is effective. It is suitable to make the first exchange of total volume medium in 8-10 hours. The subcultured cell has the capacity for amplification and will probably be a seed cell for the research of tissue engineering and gene therapy.

[Establishment of transgenic mice of hepatitis B virus X gene (adr subtype) mediated by spermatogonial cells].

OBJECTIVE: To test the possibility of using spermatogonial cells as vector in the establishment of HBV X gene transgenic mice. METHODS: Eukaryoti expression vector pcDNA3-X of hepatitis B virus X gene was constructed. The recombinant pcDNA3-X packed by liposome was injected into testicle tissue of male C57BL/6N mice using microvolume injector. Six weeks after the first injection, the mice were crossed with female mice. Polymerase chain reaction and immunohistochemistry were applied to identify the viral DNA(HBx gene) harbored n liver tissue. RESULTS: The sequence of the X gene is consistent with that reported in literature. The X gene can be expressed in Hela cells. The positive rate in daughter mice was 6.25%. CONCLUSION: It is possible to use spermatogonial cells as vector to establish HBx transgenic mice.

[Isolation, cultivation and identification of neural stem cell from human embryonic CNS].

This is a study on the cultivation condition in vitro and differentiation of neural stem cells from human embryonic brain in order to find a way to get purified multipotential neural stem cells. The single cells was derived from the three-month embryonic brain digested with trypsin, some cells was frozen, the other cells were expanded with EGF and bFGF, the single-cell-clone was obtained by the way of limited dilution, and the serum was used to induce the cells differentiation. The cells were detected with the method of immunohistochemistry. The results showed that a lot of neurospheres could be seen in the presence of mitogens (both EGF and bFGF) and serum could induce neural stem cells to differentiate into neurons, astrocytes, and oligodendrocytes. These indicate that the survival and proliferation of neural stem cells rely on the cooperation of EGF and bFGF. The neural stem cells can also be harvested from the frozen cells.