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( Justin Y. Jeon ) 연세대학교 체육연구소 2004 체육연구논문집 Vol.11 No.1
척수 장애인은 일반인에 비해 당뇨병과 심장질환에 걸릴 확률이 약 3배에서 5배 가량 높다. 척수 장애인이 당뇨병과 심장질환에 걸릴 확률이 높은 이유는 운동부족과 비만이다. 운동은 비만 그리고 비만과 관련된 당뇨병과 심장질환을 예방해 주는 효과가 있다는 선행연구가 많이 있다. 새롭게 발견된 렙틴이란 호르몬은 인체의 비만도를 조절한다고 알려져 있다. 렙틴은 지방에서 만들어져 피를 통해 우리의 몸을 순환하게 되며 주로 뇌에서 그 주요 작용을 하여 식욕과 기초 대사량을 조절한다고 알려져 있다. 렙틴이 효과적으로 작용을 하기 위해서는 정상적인 교감신경계를 필요로 한다. 하지만 척수 장애인은 척수의 절단과 손상으로 인해 정상적인 교감신경계를 가지고 있지 않다. 그러므로 척수 장애인은 일반인에 비해 비만과 비만관련 만성질병이 발병될 위험이 증가되어 있다. 본 논문은 렙틴생리와, 운동이 렙틴 대사에 주는 영향, 교감신경계가 렙틴 대사에 미치는 영향 그리고 운동이 척수 장애인 비만과 당뇨에 어떠한 영향을 주는지 연구 하였다. People with spinal cord injury (SCI) have three to five times higher risk of developing type 2 diabetes and cardiovascular disease. The mechanisms for the high risk of developing type 2 diabetes and cardiovascular disease in people with SCI are due to reduced physical activity and higher prevalence of obesity. Exercise is known to prevent and treat obesity and obesity related disorders such as type 2 diabetes and cardiovascular disease. Newly found hormone, leptin, has been known to control obesity. Leptin is produced by adipose tissue and secreted into the blood stream, which mainly acts in the hypothalamus to control food intake and basal metabolic rate. Sympathetic nervous system plays an important role in regulating leptinmediated basal metabolic rate. Impairment in sympathetic nervous system in people with SCI may put them at the higher risk of developing obesity and obesity related disorders. This review paper discusses the current literature on leptin physiology, the effects of exercise on leptin metabolism, role of sympathetic nervous system in leptin regulation, and the effects of exercise on obesity and type 2 diabetes in people with SCI.
Jeon, Hyeona,Tsui, Jonathan H.,Jang, Sue Im,Lee, Justin H.,Park, Soojin,Mun, Kevin,Boo, Yong Chool,Kim, Deok-Ho American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.8
<P>Endothelial physiology is regulated not only by humoral factors, but also by mechanical factors such as fluid shear stress and the underlying cellular matrix microenvironment. The purpose of the present study was to examine the effects of matrix topographical cues on the endothelial secretion of cytokines/chemokines in vitro. Human endothelial cells were cultured on nanopatterned polymeric substrates with different ratios of ridge to groove widths (1:1, 1:2, and 1:5) and with different stiffnesses (6.7 MPa and 2.5 GPa) in the presence and absence of 1.0 ng/mL TNF-α. The levels of cytokines/chemokines secreted into the conditioned media were analyzed with a multiplexed bead-based sandwich immunoassay. Of the nanopatterns tested, the 1:1 and 1:2 type patterns were found to induce the greatest degree of endothelial cell elongation and directional alignment. The 1:2 type nanopatterns lowered the secretion of inflammatory cytokines such as IL-1β, IL-3, and MCP-1, compared to unpatterned substrates. Additionally, of the two polymers tested, it was found that the stiffer substrate resulted in significant decreases in the secretion of IL-3 and MCP-1. These results suggest that substrates with specific extracellular nanotopographical cues or stiffnesses may provide anti-atherogenic effects like those seen with laminar shear stresses by suppressing the endothelial secretion of cytokines and chemokines involved in vascular inflammation and remodeling.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-8/acsami.5b00554/production/images/medium/am-2015-00554x_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b00554'>ACS Electronic Supporting Info</A></P>
Jeon, Hyon Jin,Pak, Gi Deok,Im, Justin,Owusu-Dabo, Ellis,Adu-Sarkodie, Yaw,Gassama Sow, Amy,Bassiahi Soura, Abdramane,Gasmelseed, Nagla,Keddy, Karen H,Bjerregaard-Andersen, Morten,Konings, Frank,Aseff Oxford University Press 2018 Clinical infectious diseases Vol.67 No.12
<▼1><P><B>Abstract</B></P><P><B>Background</B></P><P>The World Health Organization recently prequalified a typhoid conjugate vaccine (TCV), recommending its use in persons ≥6 months to 45 years residing in typhoid fever (TF)–endemic areas. We now need to consider how TCVs can have the greatest impact in the most vulnerable populations.</P><P><B>Methods</B></P><P>The Typhoid Fever Surveillance in Africa Program (TSAP) was a blood culture-based surveillance of febrile patients from defined populations presenting at healthcare facilities in 10 African countries. TF and invasive non-typhoidal <I>Salmonella</I> (iNTS) disease incidences were estimated for 0–10 year-olds in one-year age increments.</P><P><B>Results</B></P><P><I>Salmonella</I> Typhi and iNTS were the most frequently isolated pathogens; 135 and 94 cases were identified, respectively. Analysis from three countries was excluded (incomplete person-years of observation (PYO) data). Thirty-seven of 123 TF cases (30.1%) and 71/90 iNTS disease cases (78.9%) occurred in children aged <5 years. No TF and 8/90 iNTS infections (8.9%) were observed in infants aged <9 months. The TF incidences (/100 000 PYO) for children aged <1 year and 1 to <2 years were 5 and 39, respectively; the highest incidence was 304 per 100 000 PYO in 4 to <5 year-olds. The iNTS disease incidence in the defined age groups ranged between 81 and 233 per 100 000 PYO, highest in 1 to <2 year-olds. TF and iNTS disease incidences were higher in West Africa.</P><P><B>Conclusions</B></P><P>High burden of TF detected in young children strengthens the need for TCV introduction. Given the concurrent iNTS disease burden, development of a trivalent vaccine against <I>S.</I> Typhi, <I>S.</I> Typhimurium, and <I>S.</I> Enteritidis may be timely in this region.</P></▼1><▼2><P>A significant burden of typhoid fever in children aged <5 years in sub-Saharan Africa merits the introduction of typhoid conjugate vaccine at age 9 months, which coincides with the first dose of measles vaccine.</P></▼2>
Determinant of Arterial Stiffness in Young Adults
조윤경,Justin Y. Jeon,김은성,제갈윤석,엄용빈,임지애 대한의생명과학회 2006 Biomedical Science Letters Vol.12 No.3
young subjects may be valuable in further elucidating at this issue. We evaluated the association between baPWV (brachial-ankle pulse wave velocity) and cardiovascular risk factors in apparently healthy young adults. A total of 46 male and 91 female adolescents aged 18~25 years were studied. baPWV increased in a dose-responsive manner as the number of metabolic syndrome components. In both gender groups, baPWV was positively correlated with age. In males, waist, circumference total cholesterol, and LDL-cholesterol were positively correlated with baPWV, and in females, blood pressure (BP) was positively correlated with baPWV. Age, gender, mean BP, and Homeostasis model assessment insulin resistance (HOMA-IR) were found to be independent factors associated with baPWV levels. In conclusion, mean BP, age, gender, and HOMA-IR were associated with baPWV in young adults. This result suggests that multiple cardiovascular risk factors may be associated with an increased risk of arterial stiffness in young adults.
다양한 온도 조건에서 제조한 크라프트 리그닌 탄화물의 특성 및 슈퍼커패시터로의 적용
저스틴알프레드페 ( Justin Alfred Pe Iii ),전세진 ( Se-jin Jeon ),길명섭 ( Myung-seob Khil ),문성필 ( Sung-phil Mun ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.2
Kraft lignin (KL) was carbonized at temperatures ranging from 600 °C to 1200 °C under inert atmosphere to investigate their performance as an electrode material in symmetrical supercapacitors. The carbonized samples (KL 600 to KL 1200) were characterized by elemental analysis, X-ray photoelectron spectroscopy, X-ray diffraction, Raman spectroscopy, and electrochemical characterizations. Characterization studies indicated that KL carbonized at lower carbonization temperatures produced graphitic structures. Based from the results of electrochemical characterizations, KL carbonized at 700 °C (KL 700) showed the highest specific capacitance of 45.7 F/g at 0.3 A/g among all carbonized samples. Moreover, purification by boiling and rinsing with water improved the specific capacitance of KL 700 to 62.1 F/g at 0.3 A/g. Consequently, the outcomes suggest that KL are potential precursors for electrode materials in supercapacitors.