OBJECTIVETo quantitatively evaluate the contamination area and risk of a live pathogen during tissue homogenization by either ultrasonic processor or tissue disperser.

METHODSA recombinant Herpes Simplex Virus (rHSV) containing GFP gene was used as the index virus, and fresh liver tissue from healthy mice was used as simulated specimen. After 10% liver homogenate was mixed with rHSV (100 TCID50/0.1 mL) in a 5 mL tube, the stability of rHSV in liver homogenate and influences of an ultrasonic processor and a tissue disperser on viral infectivity were determined by GFP expressions in cell cultures. The contaminating areas of live viruses during homogenization were evaluated by a cell culture-based sedimentary. The contamination radii were counted by measurement of the distance between the operator and the farthest GFP positive well.

RESULTSThe infectivity of rHSV in 10% liver homogenate maintained almost unchanged after it was incubated at room temperature for 30 min. Treatment with an ultrasonic processor clearly dropped down the virus infectivity, while a disperser not. Obvious spills and slashes of live viruses were observed in processes of homogenization with those two apparatuses. The contamination radii are positively related with sample volume, output energy of operator and handling time.

CONCLUSIONHomogenizing infectious samples with an ultrasonic processor and a tissue disperser at commonly used conditions caused obvious spills and splashes of live viruses, which possesses high risk to induce Laboratory acquired infections (LAIs).

Simplexvirus ; pathogenicity ; physiology ; Ultrasonics ; Virulence

Animals ; Apoptosis ; Herpes Simplex ; physiopathology ; virology ; Humans ; MicroRNAs ; genetics ; metabolism ; Simplexvirus ; genetics ; physiology ; Virus Latency

Cyclin-dependent protein kinase (CDK) plays an important role in the replication of herpes simplex virus (HSV) and other important human disease viruses. But which kinds of CDK are required in the replication of HSV is still not clear. In this study, we infected dominant negative CDK2 cell line with different multiplicity of infection (MOI) of HSV-1-KOS strain (abbreviated as HSV below), and the results showed that the yield of HSV depended on the MOI; the replication of HSV delayed about 3 h as compared with that of the control in the one-step growth curve replication experiments; the CDK2 activity was induced 6 h post HSV infection and reached the highest 9 h post infection; the HSV went into rapid productive replication after the CDK2 was induced. We propose herein that the CDK2 is required in the initiation of replication of HSV.
Animals ; Cell Proliferation ; Cercopithecus aethiops ; Cyclin-Dependent Kinase 2 ; physiology ; HT29 Cells ; Humans ; Simplexvirus ; physiology ; Vero Cells ; Virus Replication

BACKGROUNDOncolytic herpes simplex virus (HSV) vectors can be used for cancer therapy as direct cytotoxic agents, inducers of anti-tumor immune responses, and as expressers of anti-cancer genes. In this study, the efficacy of HSV vectors, G47Delta and NV1023 were examined for the treatment of the human breast cancer.

METHODSHuman breast cancer MDA-MB-435 cells were cultured or implanted subcutaneously in BALB/c nude mice. The cells or tumors were inoculated with G47Delta or NV1023, and cell killing or inhibition of tumor growth determined. Both viruses contained the LacZ gene and expression in infected cells was detected with X-gal histochemistry.

RESULTSG47Delta and NV1023 were highly cytotoxic to MDA-MB-435 cells in vitro at very low multiplicities of infection. X-gal staining of infected tumor cells in vitro and in vivo illustrated the replication and spread of both viruses. G47Delta and NV1023 inoculation inhibited tumor growth and prolonged mouse survival. Both vectors behaved similarly.

CONCLUSIONSOncolytic HSV vectors, G47Delta and NV1023, were extremely effective at killing human breast cancer cells in vitro and in tumor xenografts in vivo. This novel form of cancer therapy warrants further investigation and consideration of clinical application.

Animals ; Female ; Genetic Therapy ; Genetic Vectors ; Humans ; Mammary Neoplasms, Experimental ; pathology ; therapy ; virology ; Mice ; Mice, Inbred BALB C ; Neoplasm Transplantation ; Simplexvirus ; genetics ; physiology ; Transplantation, Heterologous ; Virus Replication

Latency within the nervous system is a characteristic feature of herpesviridae infection. It is reactivated by triggering factors such as UV exposure, stress, and trauma. Simultaneous reactivation of herpes simplex and herpes zoster is uncommon, however, an observation provably explained by differences in the trigerring mechanism. Concurrent reactivation of herpes simplex virus (HSV) and varicella zoster virus (VZV) is occasionally encountered in immunosuppressed patients; on the other hand, it is rarely reported in immunocompetent individuals. We present the case of an immunocompetent 8-yr-old female patient with concurrent reactivation of HSV on the face and VZV on the right L2 dermatome.
Buttocks/pathology/virology ; Child ; Face ; Female ; Herpes Simplex/complications/diagnosis/pathology/*virology ; Herpes Zoster/complications/diagnosis/pathology/*virology ; Herpesvirus 3, Human/*physiology ; Humans ; Immunocompetence ; Simplexvirus/*physiology ; Thigh/pathology/virology ; *Virus Activation

Oncolytic herpes simplex virus (HSV) can replicate in and kill cancer cells without harming normal tissue. G47delta is a third-generation HSV vector. In this study, the therapeutic effects of G47delta on human nasopharyngeal carcinoma (NPC) were determined in vitro and in vivo. The human NPC cell lines CNE-2 and SUNE-1, primary normal nasopharyngeal epithelial cells (NPECs), and immortalized nasopharyngeal cells NP-69 and NPEC2/Bmi1 were infected with G47delta at different multiplicities of infection (MOIs). The survival of infected cells was observed daily. Two subcutaneous models of NPC were established with CNE-2 and SUNE-1 in Balb/c nude mice. G47delta or virus buffer as control was injected into the subcutaneous tumors. Tumor size was measured twice a week, and animals were euthanized when the diameter of their tumors exceeded 18 mm or when the animals appeared moribund. For the NPC cell lines CNE-2 and SUNE-1, more than 85% and 95% of cells were killed on day 5 after G47delta infection at MOI = 0.01 and MOI = 0.1, respectively. Similar results were observed for an immortalized cell line NPEC2/Bmi-1. A moderate effect of G47delta was also found on another immortalized cell line NP-69, of which only 27.7% and 75.9% of cells were killed at MOI = 0.01 and MOI = 0.1, respectively. On the contrary, there was almost no effect observed on NPECs. The in vivo experiments showed that tumors in mice in the G47delta-treated group regressed completely, and the mice exhibited much longer survival time than those in the control groups. Our results suggest that the potential therapeutic effects of G47delta would be applicable for treatment of NPC patients in the future.
Animals ; Apoptosis ; Carcinoma ; Cell Line, Tumor ; Female ; Humans ; Mice ; Mice, Inbred BALB C ; Mice, Nude ; Nasopharyngeal Neoplasms ; pathology ; therapy ; virology ; Oncolytic Virotherapy ; methods ; Oncolytic Viruses ; physiology ; Simplexvirus ; physiology ; Xenograft Model Antitumor Assays

OBJECTIVETo construct the recombinant adenovirus containing herpes simplex virus-1 virion protein (VP) 22 and human microdystrophin gene, then the adenovirus was transfected into C2C12 myoblast and studied on the property of protein transduction with VP22-mediated microdystrophin in C2C12 myoblast.

METHODSThe full-length VP22 cDNA was obtained from recombinant plasmid pSINrep5-VP22 with PCR, and the product was directionally inserted into pShuttle-CMV to acquire the plasmid pCMV-VP22. Microdystrophin cDNA was obtained from recombinant plasmid pBSK-micro digested with restrictive endonuclease NotI, and the product was directionally inserted into pCMV-VP22 to acquire the plasmid pCMV-VP22-MICDYS. The plasmid of pCMV-VP22-MICDYS was lined with Pme I, and the fragment containing VP22-microdystrophin was reclaimed and transfected into E1 coli BJ5183 with plasmid pAdeasy-1. After having been screened by selected media, the extracted plasmid of positive bacteria was transfected into HEK293 cells with liposome and was identified by observing the cytopathic effect of cells and by PCR method to acquire the recombinant adenovirus Ad-VP22-MICDYS. Finally, the C2C12 myoblast were transfected with the recombinant adenovirus Ad-VP22-MICDYS and Ad-MICDYS, and the expression of microdystrophin was detected by RT-PCR, Western blot and immunocytochemistry.

RESULTSThe recombinant adenovirus including VP22 and microdystrophin gene was successfully constructed. VP22 transferred VP22-microdystrophin fused protein from infected C2C12 myoblast into uninfected cells and enhance the expression of microdystrophin in myoblast.

CONCLUSIONSRecombinant adenovirus containing VP22 and microdystrophin gene was constructed successfully. VP22 can enhance the expression with microdystrophin in myoblast. It lays the foundation for further studying on VP22-mediated recombinant including microdystrophin gene to cure Duchenne muscular dystrophy.

Adenoviridae ; genetics ; physiology ; Animals ; Cell Line ; Dystrophin ; genetics ; metabolism ; Genetic Vectors ; genetics ; metabolism ; Humans ; Mice ; Myoblasts ; metabolism ; virology ; Simplexvirus ; genetics ; metabolism ; Transduction, Genetic ; Viral Structural Proteins ; genetics ; metabolism ; Virion ; genetics ; metabolism

OBJECTIVETo investigate the potentiality of herpes simplex virus thymidine kinase transduced endothelial progenitor cells (EPC-TK) as angiogenesis-targeting vector in the glioma treatment in vitro and in vivo.

METHODSEPC-TK were mixed with human umbilical vein endothelial cells (HUVECs), U87 or U251 cells at various ratios for ganciclovir (GCV) treatment. The bystander effect was observed by counting the survival cells using MTT assay, and the apoptotic cells were determined by annexin-V and propidium iodide (PI) staining. EPC-TK, EPCs, or phosphate buffered saline (PBS) were injected into the nude mice model of glioma xenograft by tail vein, for the EPC-TK group, EPC group, and PBS group, respectively. And then the changes of tumor volume and tumor vasculature were observed.

RESULTSGCV killed most EPC-TK and reduced the number of other viable cells in a cell:cell ratio-dependent and time-dependent manner. EPC-TK obviously inhibited tumor growth. The tumor volumes on day 21 were 1741.20+/- 576.10 mm(3), 3275.52 +/- 710.86 mm(3) and 3033.09+/-1134.86 mm(3) in the EPC-TK, EPC and PBS group, respectively. EPC-TK also displayed a significant effect on the inhibition of tumor angiogenesis.

CONCLUSIONEPC-TK can exert a potent antiglioma effect via inhibiting angiogenesis.

Angiogenesis Inhibitors ; pharmacology ; Animals ; Antiviral Agents ; pharmacology ; Bystander Effect ; Cell Transformation, Viral ; physiology ; Endothelial Cells ; virology ; Endothelium ; Genetic Vectors ; Glioma ; therapy ; Humans ; Mice ; Mice, Nude ; Simplexvirus ; enzymology ; genetics ; Thymidine Kinase ; genetics ; Transduction, Genetic ; Transfection ; Xenograft Model Antitumor Assays

PURPOSE: We have used a genetically attenuated adenoviral vector which expresses HSVtk to assess the possible additive role of suicidal gene therapy for enhanced oncolytic effect of the virus. Expression of TK was measured using a radiotracer-based molecular counting and imaging system. MATERIALS AND METHODS: Replication-competent recombinant adenoviral vector (Ad-deltaE1B19/55) was used in this study, whereas replication-incompetent adenovirus (Ad-deltaE1A) was generated as a control. Both Ad-deltaE1B19/55-TK and Ad-deltaE1A-TK comprise the HSVtk gene inserted into the E3 region of the viruses. YCC-2 cells were infected with the viruses and incubated with 2'-deoxy-2'-fluoro-beta-D-arabinofuranosyl-5-iodouracil (I-131 FIAU) to measure amount of radioactivity. The cytotoxicity of the viruses was determined, and gamma ray imaging of HSVtk gene was performed. MTT assay was also performed after GCV treatment. RESULTS: On gamma counter-analyses, counts/minute (cpm)/microgram of protein showed MOIs dependency with deltaE1B19/55-TK infection. On MTT assay, Ad-deltaE1B19/55-TK led to more efficient cell killing than Ad-deltaE1A-TK. On plate imaging by gamma camera, both Ad-deltaE1B19/55-TK and Ad-deltaE1A-TK infected cells showed increased I-131 FIAU uptake in a MOI dependent pattern, and with GCV treatment, cell viability of deltaE1B19/55-TK infection was remarkably reduced compared to that of Ad-deltaE1A-TK infection. CONCLUSION: Replicating Ad-deltaE1B19/55-TK showed more efficient TK expression even in the presence of higher-cancer cell killing effects compared to non-replicating Ad-deltaE1A-TK. Therefore, GCV treatment still possessed an additive role to oncolytic effect of Ad-deltaE1B19/55-TK. The expression of TK by oncolytic viruses could rapidly be screened using a radiotracer-based counting and imaging technique.
Adenoviridae/*genetics/physiology ; Cell Line, Transformed ; Cell Line, Tumor ; Ganciclovir/pharmacology ; Gene Expression ; Gene Therapy/methods ; Genetic Vectors ; Humans ; *Oncolytic Virotherapy ; Oncolytic Viruses/*genetics/physiology ; Simplexvirus/genetics ; Tetrazolium Salts/analysis ; Thiazoles/analysis ; Thymidine Kinase/*genetics/metabolism ; Transgenes ; Viral Proteins/*genetics/metabolism ; Virus Replication

OBJECTIVETo investigate the killing effect of herpes simplex virus thymidine kinase gene expression actuated by the promoter of the vascular endothelial growth factor gene on human hepatocellular tumor cells under hypoxic condition.

METHODSRecombinant adenoviral vectors, AdVEGF-tk and AdVEGF-GFP, were constructed with HSV-tk or GFP under the control of VEGF promoter through AdEasy system. Then GFP expression in hepatoma cell line HepG2 and normal liver cell line L02 transfected with AdVEGF-GFP were observed under fluorescence microscope, and the sensitivity to GCV of the AdVEGF-tk-transfected cells under normoxia or hypoxia condition were monitored by MTT method.

RESULTSGFP expression actuated by VEGF promoter was detected in sporadic L02 cells, but in almost all HepG2 cells after transfected with AdVEGF-GFP. With GCV at 10 micro g/ml and MOI at 100, L02 cells were insensitive to GCV under oxic condition, but more than 70% L02 cells were killed under hypoxic condition. Moreover, HepG2 cells infected with AdVEGF-tk showed the increased GCV sensitivity under hypoxia (over 80% killed) as compared with normoxia (over 60% killed) conditions.

CONCLUSIONHypoxia enhances the GCV sensitivity of human hepatocellular tumor cells infected with recombinant AdVEGF-tk under the control of VEGF promoter.

Adenoviridae ; genetics ; Carcinoma, Hepatocellular ; pathology ; Endothelial Growth Factors ; genetics ; Gene Expression ; drug effects ; Gene Transfer Techniques ; Genetic Vectors ; genetics ; Humans ; Hypoxia ; Intercellular Signaling Peptides and Proteins ; genetics ; Liver Neoplasms ; pathology ; Lymphokines ; genetics ; Oxygen ; pharmacology ; Promoter Regions, Genetic ; physiology ; Simplexvirus ; enzymology ; Thymidine Kinase ; genetics ; metabolism ; Tumor Cells, Cultured ; Vascular Endothelial Growth Factor A ; Vascular Endothelial Growth Factors