• Nuclear Medicine and Molecular Imaging
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• v.41 no.2
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• pp.91-96
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• 2007

The measurement of pathologically low levels of tissue $pO_2$ is an important diagnostic goal for determining the prognosis of many clinically important diseases including cardiovascular insufficiency, stroke and cancer. The target tissues nowaday have mostly been tumors or the myocardium, with less attention centered on the brain. Radiolabelled nitroimidazole or derivatives may be useful in identifying the hypoxic cells in cerebrovascular disease or traumatic brain injury, and hypoxic-ischemic encephalopathy. In acute stroke, the target of therapy is the severely hypoxic but salvageable tissue. $^{18}F-MISO$ PET and $^{99}mTc-EC-metronidazole$ SPECT in patients with acute ischemic stroke identified hypoxic tissues and ischemic penumbra, and predicted its outcome. A study using $^{123}I-IAZA$ in patient with closed head injury detected the hypoxic tissues after head injury. Up till now these radiopharmaceuticals have drawbacks due to its relatively low concentration with hypoxic tissues associated with/without low blood-brain barrier permeability and the necessity to wait a long time to achieve acceptable target to background ratios for imaging in acute ischemic stroke. It is needed to develop new hypoxic marker exhibiting more rapid localization in the hypoxic region in the brain. And then, the hypoxic brain imaging with imidazoles or non-imidazoles may be very useful in detecting the hypoxic tissues, determining therapeutic strategies and developing therapeutic drugs in several neurological disease, especially, in acute ischemic stroke.

• The Journal of Pediatrics of Korean Medicine
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• v.18 no.2
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• pp.143-160
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• 2004

Objective: There were few reports on the treatment of Hypoxic ischemic encephalopathy. We treated a hypoxic ischemic encephalopathic patient after accident with Oriental medical approach, and get a significant result. this treatment shows the possibility of healing Hypoxic ischemic encephalopathy, So we are reporting that case. Method : The acupuncture, herb medication. rehabilitation therapy was applied for treting patient's chife symptom(involuntary movement, dystonia, aphasia, dysuria, constipation) Results : 1. Generally patients with Hypoxic ischemic encephalopathy show language impairment and cognition disorder for several weeks to months. After coma stage, first they recover consciousness but have various degree of confusional mentality, visual agnosia, extrapyramidal stiffness and motor disturbance. 2. Consciousness loss in acute stage of Hypoxic ischemic encephalopathy can be considered as Mental Confusion due to Phlegm(Dammisimgyu) in veiw point of Oriental medicine. 3. After oriental medical treatment, patient's chief symptoms were improved. Conclusion: We treated a hypoxic ischemic encephalopathic patient with Oriental medical approach and patient's chief symptoms were improved. this treatment shows the possibility of healing Hypoxic ischemic encephalopathy.

• ALGAE
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• v.38 no.4
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• pp.265-281
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• 2023

Hypoxia can indeed impact the survival of protists, which play a crucial role in marine ecosystems. To better understand the protistan community structure and species that can thrive in hypoxic waters, we collected samples from both the surface and bottom waters during the hypoxic period in Jinhae and Masan Bays and the non-hypoxic period in Jinhae Bay. Subsequently, we utilized metabarcoding techniques to identify the protistan species. During hypoxia, with dissolved oxygen concentrations of 0.8 mg L^-1 in Jinhae Bay and 1.8 mg L^-1 in Masan Bay within the bottom waters, the phylum Dinoflagellata exhibited the highest amplicon sequence variants richness among the identified protist phyla. Following the Dinoflagellata, Ochrophyta and Ciliophora also displayed notable presence. In hypoxic waters of Jinhae and Masan Bays, we identified a total of 36 dinoflagellate species that exhibited various trophic modes. These included one autotrophic species, 14 mixotrophic species, 9 phototrophic species with undetermined trophic modes (either autotrophic or mixotrophic), 2 kleptoplastidic species, and 10 heterotrophic species. Furthermore, the hypoxic bottom water exhibited a greater number of heterotrophic dinoflagellate species compared to the non-hypoxic surface water within the same water column or the non-hypoxic bottom water. Therefore, feeding by mixotrophic and heterotrophic dinoflagellates may be partially responsible for their dominance in terms of the number of species surviving in hypoxic waters. This study not only introduces the initial documentation of 26 dinoflagellate species surviving in hypoxic conditions but also establishes a foundation for a more comprehensive understanding of the ecophysiology of dinoflagellates in hypoxic marine environments.

• The Korean Journal of Physiology and Pharmacology
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• v.18 no.5
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• pp.391-396
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• 2014

Although interleukin-11 (IL-11) has been reported to be elevated in hypoxic tumors and has been associated with a poor prognosis in various cancers, little is known about its precise role in promoting metastasis in hypoxic tumors. In the present study, the molecular mechanism underlying the effects of IL-11 on MDA-MB-231 breast cancer cells migration and invasion in relation to metastasis under hypoxic conditions has been defined. Inhibition of IL-11 expression or function using small interfering RNA (siRNA) or a neutralizing antibody attenuated hypoxic MDA-MB-231 breast cancer cell migration and invasion through down-regulation of matrix metalloproteinases (MMPs) and activation of epithelial-to-mesenchymal transition (EMT) related gene expression. In addition, hypoxia-induced IL-11 increased STAT3 phosphorylation and STAT3 knockdown suppressed hypoxic MDA-MB-231 breast cancer cell invasion due to reduced MMP levels and reprogrammed EMT-related gene expression. These results suggest that one of the hypoxic metastasis pathways and the regulation of this pathway could be a potential target for novel cancer therapeutics.

• The Journal of Korean Medicine
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• v.29 no.1
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• pp.167-178
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• 2008

Object : Gliosis becomes a physical and mechanical barrier to axonal regeneration. Reactive gliosis induced by hypoxic brain injury is involved with up-regulation of CD81 and GFAP. The current study was to examine the effect of the Angelica Sinens on CD81 and GFAP regulation after hypoxic brain injury in the astrocyte. Methods : MTT assay was performed to examine cell viability, and cell based ELISA, western blot and PCR were used to detect the expression of CD81 and GFAP. Results : The following results were obtained: 1. Using ELISA, western blot and PCR from the astrocyte after hypoxic injury, CD81 and GFAP expression was seen to have increased. 2. After the administration of Angelica Sinens extract to astrocyte following hypoxic injury, CD81 and GFAP expression was down regulated significantly. The water extract of Angelica Sinens prevented cell destruction by hypoxic induced with $CoCl_2$. Conclusion : These results indicate that Angelica Sinens could suppress reactive gliosis, which disturbs astrocyte regeneration after hypoxic brain injury by controlling the expression of CD81 and GFAP.

• The Korean Journal of Physiology and Pharmacology
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• v.6 no.4
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• pp.183-186
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• 2002

Ischemic damage is one of the most serious problems. The openers of KATP channel have been suggested to have an effect to limit the ischemic damage. However, it is not yet clear how KATP channels of a cell correspond to hypoxic damage. To address the question, N2a cells were exposed to two different hypoxic conditions as follows: 6 hours hypoxia followed by 3 hours reperfusion and 12 hours hypoxia followed by 3 hours reperfusion. As the results, 6 hours hypoxic treatment increased glibenclamide- sensitive basal $K_{ATP}$ current activity (approximately 6.5-fold at 0 mV test potential) when compared with nomoxic condition. In contrast, 12 hours hypoxic treatment induced a relatively smaller change in the $K_{ATP}$ current density (2.5-fold at 0 mV test potential). Additionally, in experiments where $K_{ATP}$ channels were opened using diazoxide, the hypoxia for 6 hours significantly increased the current density in comparison to control condition (p＜0.001). Interestingly, the augmentation in the $K_{ATP}$ current density reduced after exposure to the 12 hours hypoxic condition (p＜0.001). Taken together, these results suggest that $K_{ATP}$ channels appear to be recruited more in cells exposed to the 6 hours hypoxic condition and they may play a protective role against hypoxia-reperfusion damage within the time range.

• Animal cells and systems
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• v.15 no.4
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• pp.279-286
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• 2011

Hypoxic ischemia injury is a common cause of functional brain damage, resulting from a decrease in cerebral blood flow and oxygen supply to the brain. The main problems associated with hypoxic ischemia to the brain are memory impairment and dopamine dysfunction. Hypothermia has been suggested to ameliorate the neurological impairment induced by various brain insults. In this study, we investigated the effects of hypothermia on memory function and dopamine synthesis following hypoxic ischemia to the brain in rats. For this purpose, a step-down avoidance task, a radial eight-arm maze task, and immunohistochemistry for tyrosine hydroxylase (TH) and 5-bromo-2'-deoxyuridine (BrdU) were performed. The present results indicated that the hypoxic ischemia-induced disturbance of the animal's performances and spatial working memory was associated with a decrement in TH expression in the substantia nigra and striatum, and an increase in cell proliferation in the hippocampal dentate gyrus. Hypothermia treatment improved the animals' performance and spatial working memory by suppressing the decrement in TH expression in the substantia nigra and striatum and the increase in cell proliferation in the dentate gyrus. We suggest that hypothermia can be an efficient therapeutic modality to facilitate recovery following hypoxic ischemia injury to the brain, presumably by modulating the dopaminergic cell loss.

• The Korean Journal of Physiology and Pharmacology
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• v.17 no.5
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• pp.463-468
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• 2013

Acute hypoxia induces contraction of pulmonary artery (PA) to protect ventilation/perfusion mismatch in lungs. As for the cellular mechanism of hypoxic pulmonary vasoconstriction (HPV), hypoxic inhibition of voltage-gated $K^+$ channel (Kv) in PA smooth muscle cell (PASMC) has been suggested. In addition, our recent study showed that thromboxane $A_2$ ($TXA_2$) and hypoxia-activated nonselective cation channel ($I_{NSC}$) is also essential for HPV. However, it is not well understood whether HPV is maintained in the animals exposed to ambient hypoxia for two days (2d-H). Specifically, the associated electrophysiological changes in PASMCs have not been studied. Here we investigate the effects of 2d-H on HPV in isolated ventilated/perfused lungs (V/P lungs) from rats. HPV was almost abolished without structural remodeling of PA in 2d-H rats, and the lost HPV was not recovered by Kv inhibitor, 4-aminopyridine. Patch clamp study showed that the hypoxic inhibition of Kv current in PASMC was similar between 2d-H and control. In contrast, hypoxia and $TXA_2$-activated $I_{NSC}$ was not observed in PASMCs of 2d-H. From above results, it is suggested that the decreased $I_{NSC}$ might be the primary functional cause of HPV disappearance in the relatively early period (2 d) of hypoxia.

• The Journal of Pediatrics of Korean Medicine
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• v.19 no.2
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• pp.127-136
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• 2005

Objective: There were few reports on the treatment of Wolff-Parkinson-White syndrome with Hypoxic ischemic encephalopathy. We treated a Wolff-Parkinson-White syndrome with Hypoxic ischemic encephalopathic patient with Oriental medical approach, and got a significant result. This treatment shows the possibility of healing Wolff-Parkinson-White syndrome with Hypoxic ischemic encephalopathy. So we are reporting this case. Method : Acupuncture treatment, herb medication, rehabilitation therapy were applied for treating patient's chief symptom.(involuntary movement, dystonia, aphasia, fever, perspiration) Results : Consciousness loss in acute stage of Hypoxic ischemic encephalopathy can be considered as Mental Confusion due to Phlegm(Dammisimgyu) in veiw point of Oriental medicine. Wolff-Parkinson-White syndrome can be considered as Sudden Palpitation(Gyounggye) in veiw point of Oriental medicine. After oriental medical treatment, patient's chief symptoms were improved. Conclusion: More study about oriental medical treatment on Wolff-Parkinson-White syndrome with Hypoxic ischemic encephalopathy is needed.

• The Journal of Pediatrics of Korean Medicine
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• v.19 no.2
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• pp.255-269
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• 2005

Objective : To evaluate the effect of Oriental Medical Treatment on a patient with Hypoxic Ischemic Encephalopathy followed by Cardiopulmonary Resuscitation Method : We applied various methodology of Oriental Medical Treatment including Acupuncture, Electroacupuncture, Physical treatment, Herbal Medicine, Moxibustion treatment and Western medication as well. Result: Herbal medicine was applied on the basis of the patient's history. We applied formular to remove phelgm as a pathogenic factor after Hypoxic Ischemic Encephalopathy. At the same time, considering the patient spent more than a month in ICU lacking appropriate nutrition, we used formuli on the basis of 'Deficiency of Spleen' focusing to vitalize the function of digestive system. As the condition of the patient changed, we also adapted formular accordingly. We prescribed Herbal medication to strengthen Yin and Yang equally as she got hospitalized for long time. Also we applied Acupuncture treatment and Moxibustion treatment to control Qi flow. The general condition of the patient got better with successful removal of Foley catheter and elevated Glasgow Coma scale. We used Electroacupuncture, Physical treatment and Western medication at the same to get maximized effect on relaxing the contracted muscle. According to the Modified Ashworth Scale (MAS), we have some changes in muscle spasticity but later, the effect was not that significant. Conclusion : We had a patient with Hypoxic Ischemic Encephalopathy followed by Cardiopulmonary Resuscitation. In the management of Hypoxic Ischemic Encephalopathy, Conservative treatments are the mainstream but there are not many alternatives. Therefore, We suggest that Oriental medical approach may contribute to the management of Hypoxic Ischemic Encephalopathy.