Flow-induced arterial remodeling in rat mesenteric vasculature

David A. Tulis, Joseph L. Unthank, Russell L. Prewitt

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

This study was designed to characterize in vivo arterial remodeling of male Wistar rat small mesenteric arteries exposed to varying levels of elevated blood flow in the presence of normal arterial pressure. Through a series of arterial ligations, respective ileal artery and second-order branch blood flows acutely increased ~36 and ~170% over basal levels. Their respective diameters increased 12 and 38% and their wall area increased 58 and 120% in a time-dependent fashion between i and 7 days postligation compared with same-animal control vessels. Medial extracellular connective tissue increased concomitantly with medial wall hypertrophy. Immunostaining for proliferating cell nuclear antigen and nuclear profile analyses suggests that both smooth muscle and endothelial cell hyperplasia contribute to flow- induced vascular remodeling. The initial stimulus in this model is flow- mediated shear stress, with possible augmentation by hoop stress, which is increased ~7% by the resultant vasolation. Stable wall thickness-to-lumen diameter ratios at 1, 3, and 7 days, however, suggest chronic hoop stress is tightly regulated and remains constant. The model described herein allows analyses of two arteries with different degrees of flow elevation within the same animal and demonstrates that the magnitude of vessel remodeling in vivo is directly dependent on the duration of flow elevation after abrupt arterial occlusion.

Original languageEnglish (US)
Pages (from-to)H874-H882
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume274
Issue number3 43-3
StatePublished - Mar 1 1998

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Arteries
Mesenteric Arteries
Proliferating Cell Nuclear Antigen
Connective Tissue
Hypertrophy
Smooth Muscle Myocytes
Hyperplasia
Ligation
Wistar Rats
Arterial Pressure
Endothelial Cells
Vascular Remodeling

Keywords

  • Cellular hyperplasia
  • Medial wall hypertrophy
  • Mesenteric arteries
  • Shear stress

ASJC Scopus subject areas

  • Physiology

Cite this

Flow-induced arterial remodeling in rat mesenteric vasculature. / Tulis, David A.; Unthank, Joseph L.; Prewitt, Russell L.

In: American Journal of Physiology - Heart and Circulatory Physiology, Vol. 274, No. 3 43-3, 01.03.1998, p. H874-H882.

Research output: Contribution to journalArticle

Tulis, DA, Unthank, JL & Prewitt, RL 1998, 'Flow-induced arterial remodeling in rat mesenteric vasculature', American Journal of Physiology - Heart and Circulatory Physiology, vol. 274, no. 3 43-3, pp. H874-H882.
Tulis, David A. ; Unthank, Joseph L. ; Prewitt, Russell L. / Flow-induced arterial remodeling in rat mesenteric vasculature. In: American Journal of Physiology - Heart and Circulatory Physiology. 1998 ; Vol. 274, No. 3 43-3. pp. H874-H882.
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