Effects of hypobaric hypoxia on vascular endothelial growth factor and the acute phase response in subjects who are susceptible to high-altitude pulmonary oedema

2000 ◽  
Vol 81 (6) ◽  
pp. 497-503 ◽  
Author(s):  
V. Pavlicek ◽  
H. H. Marti ◽  
S. Grad ◽  
J. S. R. Gibbs ◽  
C. Kol ◽  
...  
Keyword(s):  
Vascular Endothelial Growth Factor ◽  
Growth Factor ◽  
High Altitude ◽  
Pulmonary Oedema ◽  
Acute Phase ◽  
Acute Phase Response ◽  
Hypobaric Hypoxia ◽  
Phase Response ◽  
Vascular Endothelial ◽  
Endothelial Growth Factor

scholarly journals Polymorphisms of human vascular endothelial growth factor gene in high-altitude pulmonary oedema susceptible subjects

Respirology ◽  
2009 ◽  
Vol 14 (1) ◽  
pp. 46-52 ◽  
Author(s):  
Masayuki HANAOKA ◽  
Yunden DROMA ◽  
Masao OTA ◽  
Michiko ITO ◽  
Yoshihiko KATSUYAMA ◽  
...  
Keyword(s):  
Vascular Endothelial Growth Factor ◽  
Growth Factor ◽  
High Altitude ◽  
Pulmonary Oedema ◽  
Vascular Endothelial ◽  
Factor Gene ◽  
Growth Factor Gene ◽  
Endothelial Growth Factor

Effects of high-altitude exposure on vascular endothelial growth factor levels in man

2001 ◽  
Vol 85 (1-2) ◽  
pp. 113-117 ◽  
Author(s):  
Roland Walter ◽  
Marco Maggiorini ◽  
Urs Scherrer ◽  
John Contesse ◽  
Walter H. Reinhart
Keyword(s):  
Vascular Endothelial Growth Factor ◽  
Growth Factor ◽  
High Altitude ◽  
Vascular Endothelial ◽  
Altitude Exposure ◽  
Endothelial Growth Factor

scholarly journals Hypoxia-tolerant vascular endothelial growth factor-A (VEGF-A) and the genetic variations of VEGFA in Sherpa highlanders

2020 ◽  
Author(s):  
Yunden Droma ◽  
Takumi Kinjo ◽  
Shuhei Nozawa ◽  
Nobumitsu Kobayashi ◽  
Masanori Yasuo ◽  
...  
Keyword(s):  
Vascular Endothelial Growth Factor ◽  
Growth Factor ◽  
High Altitude ◽  
Capillary Density ◽  
Tibet Plateau ◽  
Vascular Endothelial ◽  
Nucleotide Polymorphisms ◽  
High Altitudes ◽  
Tolerance To Hypoxia ◽  
Endothelial Growth Factor

AbstractSherpa highlanders demonstrate extraordinary tolerance to hypoxia at high altitudes, partly by one of the adaptation mechanisms promoting increases of microcirculatory blood flow and capillary density at high altitude for restoring oxygen supply to tissues. Hypoxia stimulates vascular endothelial growth factor (VEGF), which is an important signaling protein involved in hypoxia-stimulated vasculogenesis and angiogenesis. Our present study included 51 Sherpas dwelling in Namche Bazaar village (3440 m) and 76 non-Sherpa lowlanders residing in Kathmandu (1300 m) in Nepal. In these participants, we measured plasma VEGF-A concentrations and genotyped five single-nucleotide polymorphisms (SNPs) of VEGFA: rs699947, rs8333061, rs1570360, and rs2010963 in the 5′-untranslated region (5′-UTR); and rs3025039 in the 3′-UTR. The average circulating VEGF-A level in Sherpas did not respond to hypoxia at the high altitude in 3440 m, remaining equivalent to the level in non-Sherpa lowlanders at low altitude. Allele discriminations for the analyzed SNPs revealed significant genetic divergences of rs699947, rs8333061, and rs2010963 in Sherpa highlanders compared with non-Sherpa lowlanders, East Asians, South Asians, and the global population; however, consistency with the indigenous Tibetan highlanders from the Tibet Plateau. On the other hand, the SNP rs3025039 in the 3′-UTR presented constant preserved genetic variation among global populations. Our findings indicated that the physiological sea-level VEGF-A concentration in Sherpa highlanders at high altitude was probably linked with the significant variations of VEGFA in Sherpas that regulate the gene expression in a manner of tolerance to hypoxia through production of the optimal biological level of VEGF-A at high altitudes. Precise angiogenesis at high altitude contributes to the adaptive levels of capillary density and microcirculation, providing efficient and effective diffusion of oxygen to tissues and representing human adaptation to high-altitude hypoxia environment.Author summarySherpa highlanders demonstrate extraordinary tolerance to hypoxia at high altitudes, partly by one of the adaptation mechanisms promoting increases of microcirculatory blood flow and capillary density at high altitude for restoring oxygen supply to tissues. Vascular endothelial growth factor (VEGF) is mainly stimulated by hypoxia, and is an important signaling protein involved in hypoxia-stimulated vasculogenesis and angiogenesis. Interestingly, we found that the circulating VEGF-A level in Sherpa highlanders did not respond to hypoxia at high altitude. Furthermore, allele discrimination of the single nucleotide polymorphisms (SNPs) of VEGFA revealed significant divergences of rs699947, rs8333061, and rs2010963 within the VEGFA regulation region in Sherpa highlanders compared to the non-Sherpa lowlanders, East Asians, South Asians, and the global population; however, consistency with Tibetan highlanders from the Tibet Plateau. We propose that the hypoxia-tolerant circulating VEGF-A level in Sherpa highlanders is linked with the genetic variations of VEGFA, contributing to human adaptation to high-altitude hypoxic environments.

scholarly journals Vascular Endothelial Growth Factor (VEGF) Serological and Lacrimal Signaling in Patients Affected by Vernal Keratoconjunctivitis (VKC)

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Marcella Nebbioso ◽  
Andrea Iannaccone ◽  
Marzia Duse ◽  
Michele Aventaggiato ◽  
Alice Bruscolini ◽  
...  
Keyword(s):  
Vascular Endothelial Growth Factor ◽  
Growth Factor ◽  
Acute Phase ◽  
Mean Value ◽  
Vernal Keratoconjunctivitis ◽  
Healthy Children ◽  
Vascular Endothelial ◽  
Blood Samples ◽  
Significant Difference ◽  
Endothelial Growth Factor

Background. Vernal keratoconjunctivitis (VKC) is a rare inflammatory disease involving the ocular surface, with seasonally exacerbated symptoms. Both type-1 and type-4 hypersensitivity reactions play a role in the development of VKC. Purpose. The aim of the present study was to assess the presence and evaluate the concentration of the vascular endothelial growth factor (VEGF) in tear and blood samples from patients with VKC, during the acute phase, based on the histopathological vasculostromal structure of the tarsal papillae. Methods. Two groups of children aged between 6 and 16 years of life were enrolled: 21 patients (16 males, 76%) affected by VKC, tarsal or mixed form, and 13 healthy children (5 males, 38%) used as controls. Blood and tear samples were obtained from all patients, in order to specifically assess the presence of VEGF. Statistical analyses were performed with one-way ANOVA, followed by post hoc comparisons with the Bonferroni tests. Pearson’s correlation was chosen as statistical analysis to assess the relationship between the expression levels of VEGF in tears and blood and the clinical parameters measured. Results. Comparing the 2 groups for VEGF concentration, a statistically significant difference was found in tear samples: the mean value was 12.13 pg/mL (±5.54 SD) in the patient group and 7 pg/ml (±4.76 SD) in controls (p<0.05). However, no statistically significant difference was found when comparing VEGF concentration in blood samples (p>0.05), with a mean value of 45.17 pg/mL (±18.67 SD) in VKC patients and 38.08 pg/mL (±19.43 SD) in controls. Conclusions. This pilot study highlights the importance of lacrimal and vascular inflammatory biomarkers that can be detected in VKC patients during the acute phase, but not in healthy children. The small group of patients warrants additional studies on a larger sample, not only to further investigate the role of VEGF but also to evaluate the angiogenic biomarkers before and after topical treatment.

scholarly journals Acute Mountain Sickness Following Incremental Trekking to High Altitude: Correlation With Plasma Vascular Endothelial Growth Factor Levels and the Possible Effects of Dexamethasone and Acclimatization Following Re-exposure

2021 ◽  
Vol 12 ◽  
Author(s):  
Craig Winter ◽  
Tracy Bjorkman ◽  
Stephanie Miller ◽  
Paul Nichols ◽  
John Cardinal ◽  
...  
Keyword(s):  
Vascular Endothelial Growth Factor ◽  
Growth Factor ◽  
High Altitude ◽  
Acute Mountain Sickness ◽  
Vascular Endothelial ◽  
Mountain Sickness ◽  
High Altitude Illness ◽  
Exercise Induced ◽  
Endothelial Growth Factor ◽  
Vegf Level

Purpose: The recognition and treatment of high-altitude illness (HAI) is increasingly important in global emergency medicine. High altitude related hypobaric hypoxia can lead to acute mountain sickness (AMS), which may relate to increased expression of vascular endothelial growth factor (VEGF), and subsequent blood-brain barrier (BBB) compromise. This study aimed to establish the relationship between AMS and changes in plasma VEGF levels during a high-altitude ascent. VEGF level changes with dexamethasone, a commonly used AMS medication, may provide additional insight into AMS.Methods: Twelve healthy volunteers ascended Mt Fuji (3,700 m) and blood samples were obtained at distinct altitudes for VEGF analysis. Oxygen saturation (SPO2) measurements were also documented at the same time-point. Six out of the 12 study participants were prescribed dexamethasone for a second ascent performed 48 h later, and blood was again collected to establish VEGF levels.Results: Four key VEGF observations could be made based on the data collected: (i) the baseline VEGF levels between the two ascents trended upwards; (ii) those deemed to have AMS in the first ascent had increased VEGF levels (23.8–30.3 pg/ml), which decreased otherwise (23.8–30.3 pg/ml); (iii) first ascent AMS participants had higher VEGF level variability for the second ascent, and similar to those not treated with dexamethasone; and (iv) for the second ascent dexamethasone participants had similar VEGF levels to non-AMS first ascent participants, and the variability was lower than for first ascent AMS and non-dexamethasone participants. SPO2 changes were unremarkable, other than reducing by around 5% irrespective of whether measurement was taken for the first or second ascent.Conclusion: First ascent findings suggest a hallmark of AMS could be elevated VEGF levels. The lack of an exercise-induced VEGF level change strengthened the notion that elevated plasma VEGF was brain-derived, and related to AMS.

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