Method for producing recombinant cells for detecting HIV
Recombinant expression vectors and methods are provided for detecting HIV and monitoring HIV drug resistance. The method comprises: taking a culture of cells; adding a recombinant viral vector into the culture to transduce the cells, the recombinant viral vector comprising a reporter sequence comprising a reporter gene whose expression is regulated by a protein specific to HIV viruses which is expressed from a genome of an HIV virus upon infection of a cell in the culture that is transduced by the recombinant viral vector, and a receptor sequence comprising CD 4 and one or more coreceptor genes, expression of the coreceptor genes facilitating productive infection of the transduced cell and enabling HIV virus which has infected the transduced cell to replicate and infect non-infected cells in the culture of the cells transduced by the recombinant viral vector; infecting the transduced cells with a sample containing HIV; adding one or more anti-HIV agents to the cell culture; and detecting a change in a level of expression of the reporter gene in cells.
1. A method for producing recombinant cells for detecting a presence of HIV in a sample, comprising:
establishing a culture of cells having a reporter sequence comprising a reporter gene whose expression is regulated by a protein specific to HIV; and
transducing the cells with a recombinant adenoviral vector having sequences comprising a CD4 gene and one or more cell surface coreceptor genes for HIV and an interleukin gene whose expression of an interleukin renders the transduced cell more susceptible to HIV; infection;
wherein the transduced cells are more susceptible to HIV infection and express the one or more coreceptors for HIV at an elevated level such that productive infection of the transduced cells by HIV is achieved, said productive infection defined as HIV viral replication and infection of non-infected cells in the culture of the transduced cells.
2. The method of claim 1 , wherein the recombinant adenoviral vector is replication incompetent.
3. The method of claim 1 , wherein the reporter gene expression is up-regulated by the HIV specific protein.
4. The method of claim 1 , wherein the HIV specific protein is an HIV transactivator protein.
5. The method of claim 4 , wherein the HIV transactivator protein is Tat.
6. The method of claim 1 , wherein the reporter sequence comprises a promoter sequence including an HIV specific enhancer sequence, and the expression of the reporter gene is regulated by binding of an HIV specific transactivator protein to the HIV specific enhancer sequence.
7. The method of claim 6 , wherein the HIV specific transactivator protein is Tat and the HIV specific enhancer sequence comprises at least one copy of TAR sequence.
8. The method of claim 1 , wherein the reporter gene is selected from the group consisting of b-galactosidase, luciferase, b-glucuronidase, green fluorescent protein, blue fluorescent protein, yellow fluorescent protein, chloramphenicol acetyl transferase, secreted embryonic alkaline phosphatase, hormones and cytokine genes.
9. The method of claim 1 , wherein the one or more coreceptor genes are selected from the group consisting of CXCR4, CCR5, CCR1, CCR2b, CCR3, CCR4, CCR8, CXCR1, CXCR2, CXCR3, CX3CR1, STRL33/BONZO and GPR15/BOB genes.
10. The method of claim 1 , wherein the one or more coreceptor genes comprise CXCR4 gene.
11. The method of claim 1 , wherein the one or more coreceptor genes comprise CXCR4 and CCR5.
12. The method of claim 1 , wherein the interleukin gene expresses interleukin-2 or interleukin-12.
13. The method of claim 1 , wherein the E1 region of the recombinant adenoviral vector is replaced by the receptor sequence and the E1 promoter remains to express the receptor sequence.
14. The method of claim 1 , wherein the E1 region including E1 promoter of the recombinant adenoviral vector is replaced by an exogenous promoter and the receptor sequence where the exogenous promoter expresses the receptor sequence.
15. The method of claim 14 , wherein the exogenous promoter is a CMV promoter.
16. The method of claim 1 , wherein the reporter sequence is positioned in the E4 or E3 region of the recombinant adenoviral vector.
17. The method of claim 1 , wherein the recombinant adenoviral vector further comprises an adenoviral packaging signal.
18. The method of claim 1 , wherein the recombinant adenoviral vector further comprises a eukaryotic polyadenylation sequence.
19. The method of claim 18 , wherein the eukaryotic polyadenylation sequence is a bovine growth hormone or SV40 polyadenylation site.
20. The method of claim 1 , wherein the culture of cells is a culture of HeLa cells.