Title:Angelica archangelica and Ginkgo biloba Extracts Recover Functional Blood
Hemoglobin Derivatives in Rabbits Exposed to High Altitude
Volume: 23
Issue: 11
Author(s): Bassem M. Raafat, Amira M. Gamal-Eldeen*, Mazen M. Almehmadi, Sherien M. El-Daly, Nahla L. Faizo and Fayez Althobaiti
Affiliation:
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, Taif University, P.O. Box 11099,Taif, 21944, Saudi Arabia
- High Altitude Research Center, Prince Sultan Medical Complex, Al-Hawiyah, Taif University, Taif, Saudi Arabia
Keywords:
Hemoglobin derivatives, oxyhemoglobin, methemoglobin, high altitude, Ginkgo biloba, Angelica archangelica.
Abstract:
Background: Shortage of oxygen is a common condition for residents of high-altitude (HA)
areas. In mammals, hemoglobin (Hb) has four derivatives: oxyhemoglobin (Hb-O2), carboxyhemoglobin
(Hb-CO), sulfhemoglobin (Hb-S), and methemoglobin (Met-Hb). In HA areas, aberrant physiological
performance of blood hemoglobin is well-established.
Objectives: The study aimed to investigate the influence of 30 days of HA residence on rabbits' total
Hb, Hb derivatives, Hb autooxidation rate, and antioxidant enzymes in comparison to low-altitude
control rabbits. Further, the study aimed to investigate the effect of antioxidant-rich Angelica archangelica
and/or Ginkgo biloba extracts on the same parameters in HA-resident rabbits.
Methods: Rabbits subjected to 30 days of HA residence were compared to low-altitude control rabbits.
HA-residence rabbits were then orally administered 0.11 g/kg b.wt. of Angelica archangelica and/or
Ginkgo biloba extract for 14 days. Hb derivatives and Hb autooxidation rate were measured spectrophotometrically.
Antioxidant enzymes were estimated using specialized kits.
Results: Compared to low-altitude rabbits, 30-day HA-residence rabbits showed a noticeable increase
(p<0.05) in Hb-O2 and Hb-CO concentration. In addition, Met-Hb concentration, autooxidation rate of
Hb molecules, and activities of superoxide dismutase (SOD) and glutathione peroxidase (GPx) exhibited
a remarkable increase in HA-residence rabbits (p<0.01), reflective of rapid ROS generation. In
HA-residence rabbits, both individual and combined treatment with antioxidant-rich extracts for 14
days resulted in recovery to near-normal functional levels of Hb-O2 and Met-Hb, Hb autooxidation
rate, and activities of SOD and GPx, while only combined treatment led to Hb-O2 recovery.
Conclusion: The findings suggest that functional Hb levels may be recovered by oral administration
of A. archangelica, G. biloba, or combined treatments. In conclusion, oxidative stress due to living in
HA areas may be avoided by supplementation with natural antioxidants.