Decorin gene delivery system and cancer treatment

1. A method for enhancing transduction efficiency of a recombinant adenovirus expression vector into a tumor cell in a solid tumor, the method comprising:

a. preparing a replication incompetent recombinant adenovirus expression vector comprising an adenovirus wild-type genome, the recombinant adenovirus expression vector comprising a first nucleotide sequence of interest operably linked to a first promoter and a polyadenylation sequence (promoter-nucleotide sequence of interest-poly A sequence) and a second nucleotide sequence encoding a wild type decorin operably linked to a second promoter and a polyadenylation sequence (promoter-decorin-encoding nucleotide sequence-poly A sequence), wherein the E3 region and the E1 region of the recombinant adenovirus genome sequence are deleted, wherein the promoter-nucleotide sequence of interest-poly A sequence and the promoter-decorin-encoding nucleotide sequence-poly A sequence are inserted into the deleted E3 region and E1 region, respectively, of the adenovirus genome sequence; and

b. infecting the tumor cell with the prepared recombinant adenovirus expression vector by administering to a subject having the solid tumor the prepared recombinant adenovirus expression vector via intravenous, intraperitoneal, intramuscular, subcutaneous or transdermal route, or intratumoral injection, wherein expression of wild type decorin in the tumor cell infected with the prepared recombinant adenovirus expression vector enhances transduction efficiency of the prepared recombinant adenovirus expression vector which has not yet infected the tumor cell by binding of the expressed wild type decorin to type-I collagen fibril in an extracellular matrix of connective tissue surrounding the tumor cell.

2. The method according to claim 1 , wherein the recombinant adenovirus expression vector further comprises a nucleotide sequence of interest operably linked to a promoter and a polyadenylation sequence (promoter-nucleotide sequence of interest-poly A sequence) in addition to the first nucleotide sequence inserted into adenoviral wild-type genome.

3. A method for enhancing transduction efficiency of a recombinant adenovirus expression vector into a tumor cell in a solid tumor, the method comprising:

a. preparing an oncolytic recombinant adenovirus expression vector comprising an adenovirus wild-type genome, the recombinant adenovirus expression vector comprising a nucleotide sequence encoding a wild type decorin operably linked to a promoter and a polyadenylation sequence (promoter-decorin-encoding nucleotide sequence-poly A sequence), wherein the promoter-decorin-encoding nucleotide sequence-poly A sequence is inserted into a deleted E1B region of the adenovirus genome sequence wherein the recombinant adenovirus expression vector comprises an active E1A gene; and

b. infecting the tumor cell with the prepared recombinant adenovirus expression vector by administering to a subject having the solid tumor the prepared recombinant adenovirus expression vector via intravenous, intraperitoneal, intramuscular, subcutaneous or transdermal route, or intratumoral injection, wherein expression of a wild type decorin in the tumor cell infected with the prepared recombinant adenovirus expression vector enhances transduction efficiency of the prepared recombinant adenovirus expression vector which has not yet infected the tumor cell by binding of the expressed a wild type decorin to type-I collagen fibril in an extracellular matrix of connective tissue surrounding the tumor cell.

4. The method according to claim 3 , wherein the prepared recombinant adenovirus expression vector comprises an inactivated gene selected from the group consisting of an inactivated E1B 19 gene, an inactivated E1B 55 gene, and an inactivated E1B 19 and E1B 55 genes.

5. A method for treating a cancer of a subject having a solid tumor, the method comprising: administering to the subject a replication incompetent recombinant adenovirus expression vector via intratumoral injection, wherein the replication incompetent recombinant adenovirus expression vector comprises a first nucleotide sequence encoding an antitumor protein operably linked to a first promoter and a polyadenylation sequence (promoter-antitumor protein-encoding nucleotide sequence-poly A sequence) and a second nucleotide sequence encoding a wild type decorin operably linked to a second promoter and a polyadenylation sequence (promoter-decorin-encoding nucleotide sequence-poly A sequence); wherein the E3 region and the E1 region of the recombinant adenovirus genome sequences are deleted, wherein the promoter—an antitumor protein-poly A sequence and the promoter-decorin-encoding nucleotide sequence-poly A sequence are inserted into the deleted E3 or the deleted E1 region of the adenovirus genome sequence; wherein expression of wild type decorin in cells of the solid tumor infected with the recombinant adenovirus expression vector enhances transduction efficiency of the recombinant adenovirus expression vector which has not yet infected the tumor cells, and wherein the method is performed without exogenous addition of a protease during transduction.

6. The method according to claim 5 , wherein the promoter-antitumor protein-encoding nucleotide sequence-poly A sequence is inserted into the deleted E1 region and the promoter-decorin-encoding nucleotide sequence-poly A sequence is inserted into the deleted E3 region.

7. The method according to claim 5 , wherein the promoter-antitumor protein-encoding nucleotide sequence-poly A sequence is inserted into the deleted E3 region and the promoter-decorin-encoding nucleotide sequence-poly A sequence is inserted into the deleted E1 region.

8. A method for treating a cancer of a subject having a solid tumor, the method comprising: administering to the subject an oncolytic recombinant adenovirus expression vector via intratumoral injection, wherein the oncolytic recombinant adenovirus expression vector comprises a nucleotide sequence encoding a wild type decorin operably linked to a promoter and a polyadenylation sequence (promoter-decorin-encoding nucleotide sequence-poly A sequence), wherein the promoter-decorin-encoding nucleotide sequence-poly A sequence is inserted into a deleted E1B region of the adenovirus genome sequence wherein the recombinant adenovirus expression vector comprises an active E1A gene; wherein expression of wild type decorin in cells of the solid tumor infected with the recombinant adenovirus expression vector enhances transduction efficiency of the recombinant adenovirus expression vector which has not yet infected the tumor cells, and wherein the method is performed without exogenous addition of a protease during transduction.

9. The method according to claim 8 , wherein the recombinant adenovirus expression vector comprises an inactivated gene selected from the group consisting of an inactivated E1B 19 gene, an inactivated E1B 55 gene, and an inactivated E1B 19 and E1B 55 genes.