Michael E. Landis, MDa, Edward C

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Presentation transcript:

Effects of dietary L -arginine on structure and function of flow-restricted vein grafts Michael E. Landis, MDa, Edward C. Ray, MDb, Peter Gloviczki, MDc, Virginia M. Miller, PhDa,c Journal of Vascular Surgery Volume 33, Issue 4, Pages 829-839 (April 2001) DOI: 10.1067/mva.2001.111987 Copyright © 2001 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions

Fig. 1 Schematic of possible metabolites of L -arginine. Journal of Vascular Surgery 2001 33, 829-839DOI: (10.1067/mva.2001.111987) Copyright © 2001 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions

Fig. 2 Time course of mean changes in plasma arginine, proline, citrulline, and ornithine after arginine feeding (200 mg/kg per day) (n = 3-7, samples from different dogs for each data point). Plasma arginine peaked 3 hours after feeding, increasing from 164 ± 11.2 to 407.7 ± 18.9 μmol/L. Parallel increases at 3 hours were also seen in plasma ornithine (18.3 ± 1.3 to 55 ± 2.6 μmol/L) and citrulline (49.8 ± 8.1 to 87.4 ± 6.68 μmol/L). Journal of Vascular Surgery 2001 33, 829-839DOI: (10.1067/mva.2001.111987) Copyright © 2001 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions

Fig. 3 Contractions to 60 mmol/L KCl in saphenous vein grafts from control and arginine-fed dogs. Data are presented as mean ± SEM; n = 6 for each group. A significant decrease in contractions was observed between control and arginine-fed dogs in grafts with (10.8 ± 0.9 vs 7.1 ± 1.2 gm tension) and without (9.4 ± 1.7 vs 4.8 ± 0.9 gm tension) endothelium under conditions of restricted flow. Asterisks denote statistically significant difference from contractions of grafts from control dogs by analysis of variance (P <.05). Journal of Vascular Surgery 2001 33, 829-839DOI: (10.1067/mva.2001.111987) Copyright © 2001 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions

Fig. 4 Contractions to the α2 -adrenergic agonist UK 14,304 in vein grafts without endothelium from control and arginine-fed dogs. Contractions of grafts under normal flow are shown in upper panel ; those from grafts with restricted flow are shown in the lower panel. Values are expressed as percent of maximal contraction to KCl (60 mm). Data are presented as mean ± SEM; n = 6 for each group. Contractions of rings with endothelium were identical to rings without endothelium, which are omitted for clarity. Journal of Vascular Surgery 2001 33, 829-839DOI: (10.1067/mva.2001.111987) Copyright © 2001 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions

Fig. 5 Relaxations to adenosine diphosphate in rings with endothelium in vein grafts with normal flow (upper panel ) and restricted flow (lower panel ) from control and arginine-fed dogs. Values are shown as percent change in tension from contractions to prostaglandin F2α (9.2 ± 2.1 and 7.4 ± 1.5 g in rings of grafts with normal flow from control and arginine-fed dogs, respectively; 7.9 ± 2.4 and 8.4 ± 2.5 g in rings of grafts with restricted flow from control and arginine-fed dogs, respectively). Data are expressed as mean ± SEM; n = 5 to 6 per group. Relaxations of rings without endothelium were similar to those with endothelium and are omitted for clarity (n = 5-6 per group). Journal of Vascular Surgery 2001 33, 829-839DOI: (10.1067/mva.2001.111987) Copyright © 2001 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions

Fig. 6 Responses to the calcium ionophore A23187 in vein grafts with endothelium from control and arginine-fed dogs under conditions of normal flow (left panel ) and restricted flow (right panel ). Values are expressed as percent of relaxations from contraction to prostaglandin F2α (2 × 10–6 mol/L; 2.5 ± 0.7 and 1.3 ± 0.5 g in rings from control and arginine-fed dogs, respectively). Data are expressed as mean ± SEM; n = 6 for each group. A significant decrease in maximal relaxation was observed in grafts from arginine-fed dogs with normal flow (P =.0178). Journal of Vascular Surgery 2001 33, 829-839DOI: (10.1067/mva.2001.111987) Copyright © 2001 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions

Fig. 7 Representative light micrographs of sections stained with elastin van Gieson from the mid portion of normal flow (top panels ) and flow-restricted (lower panels ) grafts from control (left panels ) and arginine-fed (right panels ) dogs. Intimal hyperplasia was measured as area above intimal elastin lamina (↑). Black stain : elastin; red stain : collagen; yellow stain : other cellular material. Original magnification ×200; sections 5 μm. Journal of Vascular Surgery 2001 33, 829-839DOI: (10.1067/mva.2001.111987) Copyright © 2001 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions

Fig. 8 Intimal hyperplasia was quantified with computer-assisted analysis of light microscopy, measuring the total area of the neointima and dividing by the circumference of the internal elastic lamina. There was a statistically significant increase in intimal hyperplasia in grafts under restricted flow conditions in both control and arginine-fed dogs. There was a trend toward increased development of intimal hyperplasia in arginine-fed dogs compared with control dogs under condition of flow restriction (P >.05). Data are shown as measurement from grafts of individual animals. The line indicates measurements from control and restricted grafts from the same animal. Journal of Vascular Surgery 2001 33, 829-839DOI: (10.1067/mva.2001.111987) Copyright © 2001 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions

Fig. 9 Light micrograph of immunostaining for bone sialoprotein in vein grafts with restricted flow from control dogs (upper panel ) and arginine-fed dogs (lower panel ). Staining for bone sialoprotein was greater in control compared with arginine-fed dogs. Original magnification ×100; sections 5 μm. Journal of Vascular Surgery 2001 33, 829-839DOI: (10.1067/mva.2001.111987) Copyright © 2001 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions