Inducible nitric oxide synthase promotes cytokine expression in cardiac allografts but is not required for efficient rejection

Roslyn B. Mannon, Karen Roberts, Phillip Ruiz, Victor Laubach, Thomas M. Coffman

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Background: Inducible nitric oxide synthase (iNOS) is enhanced during acute rejection. Pharmacologic inhibition of nitric oxide synthase (NOS) activity has had variable effects on graft survival in a number of animal models. To further characterize the requirement and effects of iNOS during acute allograft rejection, we examined rejection responses of mice completely deficient of iNOS. MethodsHeterotopic cardiac allografts were performed using wild-type and iNOS deficient mice (iNOS[-/-]) as recipients. Graft survival was determined by abdominal palpation. At days 3 and 7 following transplantation, grafts were harvested and analyzed histologically. Cytokine messenger RNA (mRNA) expression was measured by ribonuclease protection assay. ResultsMean survival time of cardiac allografts did not differ between wild-type (18 ± 3 days) and iNOS(-/-) recipients (16 ± 2 days). At 3 days, findings of moderate acute rejection were seen in both recipients groups, although modestly reduced in iNOS(-/-) mice. By 7 days, allografts in both groups demonstrated severe rejection. Within grafts at day 3, there was a 3-fold reduction in IL-1β expression and a 4-fold reduction in IL-1RA in iNOS(-/-) recipients (p = 0.03 and p = 0.04, respectively) compared to wild-type recipients. Expression of other proinflammatory cytokines was detected in the grafts from both recipients, but was not significantly different. Finally, rejection responses to iNOS(-/-) cardiac allografts were nearly identical to wild-type allografts.ConclusionsRejection of cardiac allografts by iNOS(-/-) mice occurs in a similar fashion to wild-type recipients, with extensive inflammation and proinflammatory cytokine production. While iNOS may play a role in cytokine induction by macrophages, these studies suggest that iNOS is not required for efficient cardiac graft rejection. Copyright (C) 1999 International Society for Heart and Lung Transplantation.

Original languageEnglish
Pages (from-to)819-827
Number of pages9
JournalJournal of Heart and Lung Transplantation
Volume18
Issue number9
DOIs
StatePublished - Sep 1 1999

Fingerprint

Nitric Oxide Synthase Type II
Allografts
Cytokines
Graft Survival
Transplants
Palpation
Graft Rejection
Ribonucleases
Interleukin-1
Nitric Oxide Synthase
Animal Models
Transplantation
Macrophages
Inflammation

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Surgery
  • Transplantation

Cite this

Inducible nitric oxide synthase promotes cytokine expression in cardiac allografts but is not required for efficient rejection. / Mannon, Roslyn B.; Roberts, Karen; Ruiz, Phillip; Laubach, Victor; Coffman, Thomas M.

In: Journal of Heart and Lung Transplantation, Vol. 18, No. 9, 01.09.1999, p. 819-827.

Research output: Contribution to journalArticle

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abstract = "Background: Inducible nitric oxide synthase (iNOS) is enhanced during acute rejection. Pharmacologic inhibition of nitric oxide synthase (NOS) activity has had variable effects on graft survival in a number of animal models. To further characterize the requirement and effects of iNOS during acute allograft rejection, we examined rejection responses of mice completely deficient of iNOS. MethodsHeterotopic cardiac allografts were performed using wild-type and iNOS deficient mice (iNOS[-/-]) as recipients. Graft survival was determined by abdominal palpation. At days 3 and 7 following transplantation, grafts were harvested and analyzed histologically. Cytokine messenger RNA (mRNA) expression was measured by ribonuclease protection assay. ResultsMean survival time of cardiac allografts did not differ between wild-type (18 ± 3 days) and iNOS(-/-) recipients (16 ± 2 days). At 3 days, findings of moderate acute rejection were seen in both recipients groups, although modestly reduced in iNOS(-/-) mice. By 7 days, allografts in both groups demonstrated severe rejection. Within grafts at day 3, there was a 3-fold reduction in IL-1β expression and a 4-fold reduction in IL-1RA in iNOS(-/-) recipients (p = 0.03 and p = 0.04, respectively) compared to wild-type recipients. Expression of other proinflammatory cytokines was detected in the grafts from both recipients, but was not significantly different. Finally, rejection responses to iNOS(-/-) cardiac allografts were nearly identical to wild-type allografts.ConclusionsRejection of cardiac allografts by iNOS(-/-) mice occurs in a similar fashion to wild-type recipients, with extensive inflammation and proinflammatory cytokine production. While iNOS may play a role in cytokine induction by macrophages, these studies suggest that iNOS is not required for efficient cardiac graft rejection. Copyright (C) 1999 International Society for Heart and Lung Transplantation.",
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N2 - Background: Inducible nitric oxide synthase (iNOS) is enhanced during acute rejection. Pharmacologic inhibition of nitric oxide synthase (NOS) activity has had variable effects on graft survival in a number of animal models. To further characterize the requirement and effects of iNOS during acute allograft rejection, we examined rejection responses of mice completely deficient of iNOS. MethodsHeterotopic cardiac allografts were performed using wild-type and iNOS deficient mice (iNOS[-/-]) as recipients. Graft survival was determined by abdominal palpation. At days 3 and 7 following transplantation, grafts were harvested and analyzed histologically. Cytokine messenger RNA (mRNA) expression was measured by ribonuclease protection assay. ResultsMean survival time of cardiac allografts did not differ between wild-type (18 ± 3 days) and iNOS(-/-) recipients (16 ± 2 days). At 3 days, findings of moderate acute rejection were seen in both recipients groups, although modestly reduced in iNOS(-/-) mice. By 7 days, allografts in both groups demonstrated severe rejection. Within grafts at day 3, there was a 3-fold reduction in IL-1β expression and a 4-fold reduction in IL-1RA in iNOS(-/-) recipients (p = 0.03 and p = 0.04, respectively) compared to wild-type recipients. Expression of other proinflammatory cytokines was detected in the grafts from both recipients, but was not significantly different. Finally, rejection responses to iNOS(-/-) cardiac allografts were nearly identical to wild-type allografts.ConclusionsRejection of cardiac allografts by iNOS(-/-) mice occurs in a similar fashion to wild-type recipients, with extensive inflammation and proinflammatory cytokine production. While iNOS may play a role in cytokine induction by macrophages, these studies suggest that iNOS is not required for efficient cardiac graft rejection. Copyright (C) 1999 International Society for Heart and Lung Transplantation.

AB - Background: Inducible nitric oxide synthase (iNOS) is enhanced during acute rejection. Pharmacologic inhibition of nitric oxide synthase (NOS) activity has had variable effects on graft survival in a number of animal models. To further characterize the requirement and effects of iNOS during acute allograft rejection, we examined rejection responses of mice completely deficient of iNOS. MethodsHeterotopic cardiac allografts were performed using wild-type and iNOS deficient mice (iNOS[-/-]) as recipients. Graft survival was determined by abdominal palpation. At days 3 and 7 following transplantation, grafts were harvested and analyzed histologically. Cytokine messenger RNA (mRNA) expression was measured by ribonuclease protection assay. ResultsMean survival time of cardiac allografts did not differ between wild-type (18 ± 3 days) and iNOS(-/-) recipients (16 ± 2 days). At 3 days, findings of moderate acute rejection were seen in both recipients groups, although modestly reduced in iNOS(-/-) mice. By 7 days, allografts in both groups demonstrated severe rejection. Within grafts at day 3, there was a 3-fold reduction in IL-1β expression and a 4-fold reduction in IL-1RA in iNOS(-/-) recipients (p = 0.03 and p = 0.04, respectively) compared to wild-type recipients. Expression of other proinflammatory cytokines was detected in the grafts from both recipients, but was not significantly different. Finally, rejection responses to iNOS(-/-) cardiac allografts were nearly identical to wild-type allografts.ConclusionsRejection of cardiac allografts by iNOS(-/-) mice occurs in a similar fashion to wild-type recipients, with extensive inflammation and proinflammatory cytokine production. While iNOS may play a role in cytokine induction by macrophages, these studies suggest that iNOS is not required for efficient cardiac graft rejection. Copyright (C) 1999 International Society for Heart and Lung Transplantation.

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