Vascular Endothelial Growth Factor Gene Delivery for Revascularization in Transplanted Human Islets

Ajit S. Narang, Kun Cheng, James Henry, Chunxiang Zhang, Omaima Sabek, Daniel Fraga, Malak Kotb, A. Osama Gaber, Ram I. Mahato

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

Purpose. Islet transplantation is limited by islet graft failure because of poor revascularization, host immune rejection, and nonspecific inflammatory response. Human vascular endothelial growth factor (hVEGF) gene delivery is likely to promote islet revascularization and survival. Methods. We evaluated gene expression from a bicistronic plasmid encoding hVEGF and enhanced green fluorescent protein (EGFP) (pCMS-EGFP-hVEGF). Glucose responsiveness of islets was evaluated both in vitro and in vivo, and revascularization in islet graft was evaluated by immunohistochemistry. Results. After transfection, hVEGF and EGFP expression levels were comparable with original monocistronic plasmids in Jurkat cells but higher and prolonged hVEGF expression in islets transfected with the bicistronic plasmid was observed, possibly as the result of differences in promoter strength and hypoxia response. The 3:1 w/w complexes showed little toxicity to islets at a dose of 5 μg DNA per 2000 islets. On glucose challenge, insulin release from transfected islets as well as secretion from islets after transplantation under the mouse kidney capsules in response to glucose stimulation, increased with time. Immunohistochemical staining of transplanted islets using mouse anti-human insulin, mouse anti-human von Willebrand factor, and rat anti-mouse CD31 antibodies suggests that islets are functional and there is new blood vessel formation. Conclusions. These findings suggest that transient hVEGF gene expression by the islets may promote islet revascularization and prolong islet survival after transplantation.

Original languageEnglish (US)
Pages (from-to)15-25
Number of pages11
JournalPharmaceutical Research
Volume21
Issue number1
DOIs
StatePublished - Jan 1 2004

Fingerprint

Vascular Endothelial Growth Factor A
Genes
Islets of Langerhans Transplantation
Plasmids
Gene expression
Glucose
Grafts
Insulin
Transplantation (surgical)
Transplants
Gene Expression
Jurkat Cells
Survival
Blood vessels
von Willebrand Factor
Capsules
Transfection
Blood Vessels
Toxicity
human VEGFA protein

Keywords

  • Bicistronic vector
  • Cationic liposomes
  • Human islets
  • Immunohistochemistry
  • Real-time RT-PCR
  • Transfection

ASJC Scopus subject areas

  • Biotechnology
  • Molecular Medicine
  • Pharmacology
  • Pharmaceutical Science
  • Organic Chemistry
  • Pharmacology (medical)

Cite this

Vascular Endothelial Growth Factor Gene Delivery for Revascularization in Transplanted Human Islets. / Narang, Ajit S.; Cheng, Kun; Henry, James; Zhang, Chunxiang; Sabek, Omaima; Fraga, Daniel; Kotb, Malak; Gaber, A. Osama; Mahato, Ram I.

In: Pharmaceutical Research, Vol. 21, No. 1, 01.01.2004, p. 15-25.

Research output: Contribution to journalArticle

Narang, Ajit S. ; Cheng, Kun ; Henry, James ; Zhang, Chunxiang ; Sabek, Omaima ; Fraga, Daniel ; Kotb, Malak ; Gaber, A. Osama ; Mahato, Ram I. / Vascular Endothelial Growth Factor Gene Delivery for Revascularization in Transplanted Human Islets. In: Pharmaceutical Research. 2004 ; Vol. 21, No. 1. pp. 15-25.
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