Gastroenterology

Gastroenterology

Volume 109, Issue 4, October 1995, Pages 1241-1248
Gastroenterology

The effects of recombinant human hemoglobin on esophageal motor function in humans

https://doi.org/10.1016/0016-5085(95)90584-7Get rights and content

Abstract

Background & Aims: Nitric oxide controls lower esophageal sphincter (LES) relaxation and esophageal peristalsis in opossums, but its role in the control of esophageal motility in humans is not defined. Hemoglobin inactivates NO by binding it. Recombinant human hemoglobin (rHb1.1) was used to test the hypothesis that NO mediates esophageal motor functions in humans. Methods: rHb1.1 or human serum albumin was administered intravenously to fasting male volunteers. Esophageal manometric studies were performed before, during, and up to 6 hours after the infusion. Results: rHb1.1 increased the velocities of peristaltic contractions to produce simultaneous contractions in 6 of 9 subjects. It increased the amplitude and duration of contractile waves in the esophagus. There was no consistent effect on the resting tone of the LES, but LES relaxation was inhibited. Spontaneous, simultaneous high-pressure contractions occurred in 8 of 9 subjects. Lower retrosternal chest pain during swallowing was observed in 4 subjects. Conclusions: rHb1.1 interfered with esophageal peristalsis and LES relaxation. It precipitated esophageal spasm in some subjects. These data support the hypothesis that the timing of smooth muscle esophageal peristalsis and LES relaxation are mediated by NO. They suggest that some disorders of esophageal motor function may result from defects in NO neuromuscular communication.

References (28)

  • K Nho et al.

    PEG-bovine hemoglobin: safety in a canine dehydrated hypovolemic-hemorrhagic shock model

    Biomaterials, Artificial Cells, Immobilization Biotechnology

    (1992)
  • J Ning et al.

    Resuscitation of bled dogs with peridoxalated-polymerized hemoglobin solution

    Biomaterials, Artificial Cells, Immobilization Biotechnology

    (1992)
  • TM Chang

    Safety studies of modified hemoglobin as an oxygen-carrying blood substitute

    Hematol Pathol

    (1993)
  • D Looker et al.

    A human recombinant haemoglobin designed for use as a blood substitute

    Nature

    (1992)
  • Cited by (0)

    Supported by Somatogen Inc., Boulder, CO; a VA Merit grant (to J.L.C.); and a VA Research Career Development Award (to J.A.M.).

    View full text