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J Appl Physiol 91: 379-385, 2001;
8750-7587/01 $5.00
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Vol. 91, Issue 1, 379-385, July 2001

Expression of heme oxygenase in the oxygen-sensing regions of the rostral ventrolateral medulla

Emilio Mazza1, Smita Thakkar-Varia2, Carol A. Tozzi1, and Judith A. Neubauer1

1 Division of Pulmonary and Critical Care Medicine, Department of Medicine, and 2 Department of Neuroscience and Cell Biology, University of Medicine and Dentistry of New Jersey Robert Wood Johnson Medical School, New Brunswick, New Jersey 08903-0019

Recently, unique regions in the rostral ventrolateral medulla (RVLM) have been found to be oxygen sensitive. However, the mechanism of sensing oxygen in these RVLM regions is unknown. Because heme oxygenase (HO) has been shown to be involved in the hypoxic responses of the carotid body and pulmonary artery, the aim of this study was to determine whether HO is present in the RVLM and whether expression of HO is altered by chronic hypoxia. Adult rats were exposed to hypoxia (10% O2) or normoxia (21% O2) for 10 days, and the mRNA for HO-1 and HO-2 was examined in the RVLM by using RT-PCR. Expression of HO-2 mRNA was seen in the RVLM of both control and hypoxic samples, whereas expression of HO-1 mRNA was only seen in the RVLM of hypoxic samples. HO-2 was immunocytochemically localized in brain sections (40 µm) to the C1 region and pre-Bötzinger complex of the RVLM. Together, these results indicate that HO-2 is present in the RVLM under control conditions and that HO-1 is induced in the RVLM during chronic hypoxia, consistent with a potential role for HO in the oxygen-sensing function of these cardiorespiratory RVLM regions.

oxygen chemosensitivity; respiration; sympathetic; chronic hypoxia; immunocytochemistry


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