Photodynamic therapy inhibits experimental allograft rejection

A novel approach for the development of vascular bioprostheses

G. M. LaMuraglia, F. Adili, T. Schmitz-Rixen, N. A. Michaud, Thomas J Flotte

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Background: Biological vascular allografts have proved unsatisfactory because of thrombosis, occlusion, and aneurysmal degeneration during chronic rejection. Photodynamic therapy (PDT), a technique that leads to the production of cytotoxic free radicals, was investigated as a novel method to prepare arterial allografts. Methods and Results: Shortly after impregnation with the photosensitizer drug chloroaluminum sulfonated phthalocyanine, infrarenal aortas of ACI rats were PDT-treated and orthotopically grafted in Lewis rats (PDT). The transplanted grafts were sequentially analyzed at 2, 4, and 8 weeks by morphometry, immunohistochemistry, and scanning electron microscopy. Of 25 untreated allografts, 4 (16%) developed aneurysms compared with 0 of 33 in PDT or untreated isografts (ISO, P<.001). PDT treatment of allografts significantly inhibited intimal hyperplasia (P<.001) and resulted in intimal areas comparable to those in ISO. However, medial thickness in both control allografts and PDT grafts was markedly decreased compared with ISO. External graft diameters of control allografts at 8 weeks were significantly enlarged (P<.02) compared with PDT or ISO. At all time points, T lymphocytes were found in a substantially larger number in untreated control grafts than in PDT or ISO. Scanning electron microscopy at 4 weeks confirmed complete repopulation with endothelial cells in PDT, which was not seen in the control allografts. Conclusions: Our findings suggest that local PDT treatment of arterial allografts inhibits inflammatory infiltration, aneurysmal dilatation, and development of intimal hyperplasia and may he used to develop vascular bioprostheses for use in humans.

Original languageEnglish (US)
Pages (from-to)1919-1926
Number of pages8
JournalCirculation
Volume92
Issue number7
StatePublished - 1995
Externally publishedYes

Fingerprint

Bioprosthesis
Photochemotherapy
Allografts
Blood Vessels
Tunica Intima
Transplants
Electron Scanning Microscopy
Hyperplasia
Inbred ACI Rats
Isografts
Photosensitizing Agents
Free Radicals
Aneurysm
Aorta
Dilatation
Thrombosis
Endothelial Cells
Immunohistochemistry
T-Lymphocytes

Keywords

  • allografts
  • arteries
  • free radicals
  • photodynamic therapy
  • rejection

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

Cite this

Photodynamic therapy inhibits experimental allograft rejection : A novel approach for the development of vascular bioprostheses. / LaMuraglia, G. M.; Adili, F.; Schmitz-Rixen, T.; Michaud, N. A.; Flotte, Thomas J.

In: Circulation, Vol. 92, No. 7, 1995, p. 1919-1926.

Research output: Contribution to journalArticle

LaMuraglia, G. M. ; Adili, F. ; Schmitz-Rixen, T. ; Michaud, N. A. ; Flotte, Thomas J. / Photodynamic therapy inhibits experimental allograft rejection : A novel approach for the development of vascular bioprostheses. In: Circulation. 1995 ; Vol. 92, No. 7. pp. 1919-1926.
@article{a4d8d3e801cc44b6980d5869c70ed2c2,
title = "Photodynamic therapy inhibits experimental allograft rejection: A novel approach for the development of vascular bioprostheses",
abstract = "Background: Biological vascular allografts have proved unsatisfactory because of thrombosis, occlusion, and aneurysmal degeneration during chronic rejection. Photodynamic therapy (PDT), a technique that leads to the production of cytotoxic free radicals, was investigated as a novel method to prepare arterial allografts. Methods and Results: Shortly after impregnation with the photosensitizer drug chloroaluminum sulfonated phthalocyanine, infrarenal aortas of ACI rats were PDT-treated and orthotopically grafted in Lewis rats (PDT). The transplanted grafts were sequentially analyzed at 2, 4, and 8 weeks by morphometry, immunohistochemistry, and scanning electron microscopy. Of 25 untreated allografts, 4 (16{\%}) developed aneurysms compared with 0 of 33 in PDT or untreated isografts (ISO, P<.001). PDT treatment of allografts significantly inhibited intimal hyperplasia (P<.001) and resulted in intimal areas comparable to those in ISO. However, medial thickness in both control allografts and PDT grafts was markedly decreased compared with ISO. External graft diameters of control allografts at 8 weeks were significantly enlarged (P<.02) compared with PDT or ISO. At all time points, T lymphocytes were found in a substantially larger number in untreated control grafts than in PDT or ISO. Scanning electron microscopy at 4 weeks confirmed complete repopulation with endothelial cells in PDT, which was not seen in the control allografts. Conclusions: Our findings suggest that local PDT treatment of arterial allografts inhibits inflammatory infiltration, aneurysmal dilatation, and development of intimal hyperplasia and may he used to develop vascular bioprostheses for use in humans.",
keywords = "allografts, arteries, free radicals, photodynamic therapy, rejection",
author = "LaMuraglia, {G. M.} and F. Adili and T. Schmitz-Rixen and Michaud, {N. A.} and Flotte, {Thomas J}",
year = "1995",
language = "English (US)",
volume = "92",
pages = "1919--1926",
journal = "Circulation",
issn = "0009-7322",
publisher = "Lippincott Williams and Wilkins",
number = "7",

}

TY - JOUR

T1 - Photodynamic therapy inhibits experimental allograft rejection

T2 - A novel approach for the development of vascular bioprostheses

AU - LaMuraglia, G. M.

AU - Adili, F.

AU - Schmitz-Rixen, T.

AU - Michaud, N. A.

AU - Flotte, Thomas J

PY - 1995

Y1 - 1995

N2 - Background: Biological vascular allografts have proved unsatisfactory because of thrombosis, occlusion, and aneurysmal degeneration during chronic rejection. Photodynamic therapy (PDT), a technique that leads to the production of cytotoxic free radicals, was investigated as a novel method to prepare arterial allografts. Methods and Results: Shortly after impregnation with the photosensitizer drug chloroaluminum sulfonated phthalocyanine, infrarenal aortas of ACI rats were PDT-treated and orthotopically grafted in Lewis rats (PDT). The transplanted grafts were sequentially analyzed at 2, 4, and 8 weeks by morphometry, immunohistochemistry, and scanning electron microscopy. Of 25 untreated allografts, 4 (16%) developed aneurysms compared with 0 of 33 in PDT or untreated isografts (ISO, P<.001). PDT treatment of allografts significantly inhibited intimal hyperplasia (P<.001) and resulted in intimal areas comparable to those in ISO. However, medial thickness in both control allografts and PDT grafts was markedly decreased compared with ISO. External graft diameters of control allografts at 8 weeks were significantly enlarged (P<.02) compared with PDT or ISO. At all time points, T lymphocytes were found in a substantially larger number in untreated control grafts than in PDT or ISO. Scanning electron microscopy at 4 weeks confirmed complete repopulation with endothelial cells in PDT, which was not seen in the control allografts. Conclusions: Our findings suggest that local PDT treatment of arterial allografts inhibits inflammatory infiltration, aneurysmal dilatation, and development of intimal hyperplasia and may he used to develop vascular bioprostheses for use in humans.

AB - Background: Biological vascular allografts have proved unsatisfactory because of thrombosis, occlusion, and aneurysmal degeneration during chronic rejection. Photodynamic therapy (PDT), a technique that leads to the production of cytotoxic free radicals, was investigated as a novel method to prepare arterial allografts. Methods and Results: Shortly after impregnation with the photosensitizer drug chloroaluminum sulfonated phthalocyanine, infrarenal aortas of ACI rats were PDT-treated and orthotopically grafted in Lewis rats (PDT). The transplanted grafts were sequentially analyzed at 2, 4, and 8 weeks by morphometry, immunohistochemistry, and scanning electron microscopy. Of 25 untreated allografts, 4 (16%) developed aneurysms compared with 0 of 33 in PDT or untreated isografts (ISO, P<.001). PDT treatment of allografts significantly inhibited intimal hyperplasia (P<.001) and resulted in intimal areas comparable to those in ISO. However, medial thickness in both control allografts and PDT grafts was markedly decreased compared with ISO. External graft diameters of control allografts at 8 weeks were significantly enlarged (P<.02) compared with PDT or ISO. At all time points, T lymphocytes were found in a substantially larger number in untreated control grafts than in PDT or ISO. Scanning electron microscopy at 4 weeks confirmed complete repopulation with endothelial cells in PDT, which was not seen in the control allografts. Conclusions: Our findings suggest that local PDT treatment of arterial allografts inhibits inflammatory infiltration, aneurysmal dilatation, and development of intimal hyperplasia and may he used to develop vascular bioprostheses for use in humans.

KW - allografts

KW - arteries

KW - free radicals

KW - photodynamic therapy

KW - rejection

UR - http://www.scopus.com/inward/record.url?scp=0029102862&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0029102862&partnerID=8YFLogxK

M3 - Article

VL - 92

SP - 1919

EP - 1926

JO - Circulation

JF - Circulation

SN - 0009-7322

IS - 7

ER -