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Melatonin plus exercise-based neurorehabilitative therapy for spinal cord injury
Hong, Yonggeun,Palaksha, K. J.,Park, Kanghui,Park, Sookyoung,Kim, Hyun-Dong,Reiter, Russel J.,Chang, Kyu-Tae Blackwell Publishing Ltd 2010 Journal of pineal research Vol.49 No.3
<P>Abstract: </P><P>Spinal cord injury (SCI) is damage to the spinal cord caused by the trauma or disease that results in compromised or loss of body function. Subsequent to SCI in humans, many individuals have residual motor and sensory deficits that impair functional performance and quality of life. The available treatments for SCI are rehabilitation therapy, activity-based therapies, and pharmacological treatment using antioxidants and their agonists. Among pharmacological treatments, the most efficient and commonly used antioxidant for experimental SCI treatment is melatonin, an indolamine secreted by pineal gland at night. Melatonin’s receptor-independent free radical scavenging action and its broad-spectrum antioxidant activity makes it an ideal antioxidant to protect tissue from oxidative stress-induced secondary damage after SCI. Owing to the limitations of an activity-based therapy and antioxidant treatment singly on the functional recovery and oxidative stress-induced secondary damages after SCI, a melatonin plus exercise treatment may be a more effective therapy for SCI. As suggested herein, supplementation with melatonin in conjunction with exercise not only would improve the functional recovery by enhancing the beneficial effects of exercise but would reduce the secondary tissue damage simultaneously. Finally, melatonin may protect against exercise-induced fatigue and impairments. In this review, based on the documented evidence regarding the beneficial effects of melatonin, activity-based therapy and the combination of both on functional recovery, as well as reduction of secondary damage caused by oxidative stress after SCI, we suggest the melatonin combined with exercise would be a novel neurorehabilitative strategy for the faster recovery after SCI.</P>
Analysis of the communications of sleepy nodes in constrained node networks
YongGeun Hong,JooSang Youn,MyungKi Shin 한국산업정보학회 2014 한국산업정보학회 학술대회논문집 Vol.2014 No.1
This paper describes the use cases of communication considering sleepy nodes and the problems of connecting to sleepy nodes in constrained node networks. The use cases of communications between sleepy nodes and non-sleepy nodes are classified by the end-to-end communication and the network topology. The adaptation of power saving in constrained nodes raises compelling problems in network layer/transport/application layer. In this paper, problems of each layer in a sleepy node are described.
대장암 세포주에서 메타아비산 나트륨에 의한 G1 세포주기 정지
홍윤경(Yunkyung Hong),김선미(Sunmi Kim),이승훈(Seunghoon Lee),강재선(Jae Seon Kang),홍용근(Yonggeun Hong) 대한약학회 2011 약학회지 Vol.55 No.5
KML001 reduced the proliferation of HCT116 cells in a concentration- and time-dependent manner without change of cell viability. Beclin-1 expression was significantly attenuated by KML001 (P<0.05), but no significant changes were observed in KML001-treated cells. The number of cells in G1 phase was increased 48 hr after KML001 treatment. Furthermore, a dramatic reduction in the frequency of beating and the number of embryoid bodies of the cells was noted after treatment. Taken together, KML001 suppresses the proliferation of HCT116 cells, which might be due to G1 phase arrest.
홍용근,박윤배,Hong Yonggeun,Pak Yunbae 한국생명과학회 2005 생명과학회지 Vol.15 No.2
본 연구는 혈당강하효과를 갖는 chiro-inositol을 다량 함유하고 있는 식품이나 식용물질을 탐색하여 선발하고, 선택된 식품이나 식용물질에서 chiro-inositol을 분리$ {\cdot}$정제하여 정제된 chiro-inositol로 동물실험을 실시하여 혈당강하효과를 증명하였다. 약 300여종의 식품 및 식용물질을 HPLC로 분석한 결과 식품으로 안전한 대두 부산물인 탈지대두와 두부 순물에서 chiro-inositol의 함량이 각각 6.75 mg/g, 20mg/kg로 조사되어 선택되었고, chiro-inositol의 순도가 $90\%$ 이상(w/w)인 chiro-inositol의 추출물을 이용하여 동물실험을 통한 혈당강하효과를 조사하였다. 그 결과, STZ로 유발된 고혈당 쥐에 경구 투여시, 약 $40\%$의 강한 혈당강하 효과를 나타내었으며 지속시간은 약 12시간이었고, 인슐린과 복합처리 했을 때 상승작용(synergy)을 나타내었으며, 저혈당증으로 전혀 발전되지 않았다. Studies with diabetic mammalian systems showed that chiro-inositol administration decreased blood glucose levels. We investigated which foodstuffs contain large amounts of chiro-inositol by surveying vegetables, edible plants and other staples in an effort to explore the nutritional or therapeutic supplements of chiro-inositol for diabetic patients. In the course of our investigation, we found that soybean and soybean derivatives have high chiro-inositol levels (upto 20 mg/g). The purified chiro-inositol from the soybean was then tested for reducing hyperglycemia by administrating the chiro-inositol in streptozotocin-treated diabetic rats. The results showed that the intragastric administration of 50 mg chiro-inositol/kg BW lowered hyperglycemia by $40\%$ and that the effect was sustained for approximately 12 hr.
The effects of smartphone use on upper extremity muscle activity and pain threshold
Lee, Minkyung,Hong, Yunkyung,Lee, Seunghoon,Won, Jinyoung,Yang, Jinjun,Park, Sookyoung,Chang, Kyu-Tae,Hong, Yonggeun The Society of Physical Therapy Science 2015 JOURNAL OF PHYSICAL THERAPY SCIENCE Vol.27 No.6
<P>[Purpose] The purpose of this study was to determine whether muscle activity and pressure-induced pain in the upper extremities are affected by smartphone use, and to compare the effects of phone handling with one hand and with both hands. [Subjects] The study subjects were asymptomatic women 20–22 years of age. [Methods] The subjects sat in a chair with their feet on the floor and the elbow flexed, holding a smartphone positioned on the thigh. Subsequently, the subjects typed the Korean anthem for 3 min, one-handed or with both hands. Each subject repeated the task three times, with a 5-min rest period between tasks to minimize fatigue. Electromyography (EMG) was used to record the muscle activity of the upper trapezius (UT), extensor pollicis longus (EPL), and abductor pollicis (AP) during phone operation. We also used a dolorimeter to measure the pressure-induced pain threshold in the UT. [Results] We observed higher muscle activity in the UT, AP, and EPL in one-handed smartphone use than in its two-handed use. The pressure-induced pain threshold of the UT was lower after use of the smartphone, especially after one-handed use. [Conclusion] Our results show that smartphone operation with one hand caused greater UT pain and induced increased upper extremity muscle activity.</P>