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  1. Article: Physical and Physiological Predictors Determining the Maximal Static Apnea Diving Time of Male Freedivers.

    Lee, Dai-Woo / Yang, Hongwei / Ju, Jeong-Sun

    Undersea & hyperbaric medicine : journal of the Undersea and Hyperbaric Medical Society, Inc

    2024  Volume 51, Issue 1, Page(s) 85–92

    Abstract: This study aimed to investigate what factors determine freedivers' maximal static apnea dive time. We correlated some physical/physiological factors with male freedivers' maximum apnea diving duration. Thirty-six experienced male freedivers participated ... ...

    Abstract This study aimed to investigate what factors determine freedivers' maximal static apnea dive time. We correlated some physical/physiological factors with male freedivers' maximum apnea diving duration. Thirty-six experienced male freedivers participated in this study. The divers participated in two days of the experiments. On the first day, apnea diving time, blood oxygen saturation (SpO
    MeSH term(s) Humans ; Apnea/etiology ; Diving ; 3-Hydroxybutyric Acid ; Blood Glucose ; Lactic Acid
    Chemical Substances 3-Hydroxybutyric Acid (TZP1275679) ; Blood Glucose ; Lactic Acid (33X04XA5AT)
    Language English
    Publishing date 2024-04-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1154414-4
    ISSN 1066-2936
    ISSN 1066-2936
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: The effects of heliox non-saturation diving on the cardiovascular system and cognitive functions.

    Lee, Dal-Woo / Jung, Su-Jeen / Ju, Jeong-Sun

    Undersea & hyperbaric medicine : journal of the Undersea and Hyperbaric Medical Society, Inc

    2020  Volume 47, Issue 1, Page(s) 93–100

    Abstract: The purpose of this study was to investigate the effects of a single bout of heliox non-saturation diving on the cardiovascular system and cognitive function. Ten recreational scuba divers (10 males, ∼35 years old) participated in this study. These ... ...

    Abstract The purpose of this study was to investigate the effects of a single bout of heliox non-saturation diving on the cardiovascular system and cognitive function. Ten recreational scuba divers (10 males, ∼35 years old) participated in this study. These subjects made two pool dives within a one-week interval, alternating gases with compressed air (21% O2, 79% N2) and with heliox (21% O2 and 79% He). The depth was to 26 meters over a 20-minute duration. The results showed that heliox diving significantly increased blood O2 saturation by 1.15% and significantly decreased blood lactate levels by ∼57% when compared with air diving (P ≺ 0.05). However, there were no significant differences in resting heart rate, systolic or diastolic pressure, core body blood pressure, and pulse wave velocity between the heliox and air dives. The Stroop test showed that the heliox dive significantly increased cognitive function compared with the air dive in both the simple test (Offtime) and interference test (Ontime) (P ≺ 0.05). It was concluded that the heliox dive increases blood O2 saturation and decreases blood lactate concentration when compared with air dives. These conditions are likely to help divers reduce hypoxia in the water, reduce the risk of loss of consciousness, reduce fatigue and allow them to dive for longer. Heliox diving may also help judgment and risk coping skills in the water due to the improvement of cognitive ability as compared to air breathing dives.
    MeSH term(s) Adult ; Air ; Blood Pressure/drug effects ; Cardiovascular System/drug effects ; Cell Hypoxia ; Cognition/drug effects ; Diving/physiology ; Heart Rate/drug effects ; Helium/pharmacology ; Humans ; Hypoxia/blood ; Hypoxia/prevention & control ; Lactic Acid/blood ; Male ; Oxygen/blood ; Oxygen/pharmacology ; Pulse Wave Analysis ; Recreation ; Time Factors ; Vascular Stiffness
    Chemical Substances Helium (206GF3GB41) ; Lactic Acid (33X04XA5AT) ; heliox (58933-55-4) ; Oxygen (S88TT14065)
    Language English
    Publishing date 2020-03-15
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1154414-4
    ISSN 1066-2936
    ISSN 1066-2936
    DOI 10.22462/01.03.2020.10
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Measurement of autophagy flux in benign prostatic hyperplasia in vitro.

    Oh, Sung-Hee / Lee, Dong-Won / Choi, Yong-Bok / Lee, Yoo-Hyun / Ju, Jeong-Sun

    Prostate international

    2020  Volume 8, Issue 2, Page(s) 70–77

    Abstract: Background: Recent studies have suggested a novel therapeutic strategy for treatment of benign prostatic hyperplasia (BPH) via modulation of autophagy. However, it is not clear whether autophagy induction or inhibition can render better therapeutic ... ...

    Abstract Background: Recent studies have suggested a novel therapeutic strategy for treatment of benign prostatic hyperplasia (BPH) via modulation of autophagy. However, it is not clear whether autophagy induction or inhibition can render better therapeutic efficacy for BPH treatment because autophagy activation in BPH tissue is not precisely known and still contradictory. The purpose of this study was to examine the levels of autophagy in BPH tissue cells.
    Methods: We have analyzed and compared autophagic flux which is defined as a measure of autophagic degradation activity in two human prostate epithelial cell lines, RWPE-1 (normal prostate) and BPH-1 (BPH) using LC3-II turnover assay, to clarify the levels of autophagy in BPH.
    Results: The
    Conclusion: It is suggested that defective autophagy, which is decreased autophagy flux in the prostate gland, may be implicated in BPH, and activating autophagy flux of the prostate with BPH may be used as a potential therapeutic target for treating and alleviating BPH disease.
    Language English
    Publishing date 2020-02-26
    Publishing country Korea (South)
    Document type Journal Article
    ZDB-ID 2711928-2
    ISSN 2287-903X ; 2287-8882
    ISSN (online) 2287-903X
    ISSN 2287-8882
    DOI 10.1016/j.prnil.2019.11.004
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Inclusion body myopathy, Paget's disease of the bone and fronto-temporal dementia: a disorder of autophagy.

    Ju, Jeong-Sun / Weihl, Conrad C

    Human molecular genetics

    2010  Volume 19, Issue R1, Page(s) R38–45

    Abstract: Inclusion body myopathy associated with Paget's disease of the bone and fronto-temporal dementia (IBMPFD) is a progressive autosomal dominant disorder caused by mutations in p97/VCP (valosin-containing protein). p97/VCP is a member of the AAA+ (ATPase ... ...

    Abstract Inclusion body myopathy associated with Paget's disease of the bone and fronto-temporal dementia (IBMPFD) is a progressive autosomal dominant disorder caused by mutations in p97/VCP (valosin-containing protein). p97/VCP is a member of the AAA+ (ATPase associated with a variety of activities) protein family and participates in multiple cellular processes. One particularly important role for p97/VCP is facilitating intracellular protein degradation. p97/VCP has traditionally been thought to mediate the ubiquitin-proteasome degradation of proteins; however, recent studies challenge this dogma. p97/VCP clearly participates in the degradation of aggregate-prone proteins, a process principally mediated by autophagy. In addition, IBMPFD mutations in p97/VCP lead to accumulation of autophagic structures in patient and transgenic animal tissue. This is likely due to a defect in p97/VCP-mediated autophagosome maturation. The following review will discuss the evidence for p97/VCP in autophagy and how a disruption in this process contributes to IBMPFD pathogenesis.
    MeSH term(s) Adenosine Triphosphatases/genetics ; Adenosine Triphosphatases/physiology ; Autophagy ; Cell Cycle Proteins/genetics ; Cell Cycle Proteins/physiology ; Frontotemporal Dementia/complications ; Frontotemporal Dementia/genetics ; Homeostasis ; Humans ; Mutation ; Myositis, Inclusion Body/complications ; Myositis, Inclusion Body/genetics ; Osteitis Deformans/complications ; Osteitis Deformans/genetics ; Valosin Containing Protein
    Chemical Substances Cell Cycle Proteins ; Adenosine Triphosphatases (EC 3.6.1.-) ; VCP protein, human (EC 3.6.4.6) ; Valosin Containing Protein (EC 3.6.4.6)
    Language English
    Publishing date 2010-04-21
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 1108742-0
    ISSN 1460-2083 ; 0964-6906
    ISSN (online) 1460-2083
    ISSN 0964-6906
    DOI 10.1093/hmg/ddq157
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: p97/VCP at the intersection of the autophagy and the ubiquitin proteasome system.

    Ju, Jeong-Sun / Weihl, Conrad C

    Autophagy

    2010  Volume 6, Issue 2, Page(s) 283–285

    MeSH term(s) Adenosine Triphosphatases/genetics ; Adenosine Triphosphatases/metabolism ; Animals ; Autophagy/physiology ; Cell Cycle Proteins/genetics ; Cell Cycle Proteins/metabolism ; Frontotemporal Dementia/genetics ; Frontotemporal Dementia/pathology ; Frontotemporal Dementia/physiopathology ; Humans ; Mice ; Myositis, Inclusion Body/genetics ; Myositis, Inclusion Body/pathology ; Myositis, Inclusion Body/physiopathology ; Osteitis Deformans/genetics ; Osteitis Deformans/pathology ; Osteitis Deformans/physiopathology ; Proteasome Endopeptidase Complex/metabolism ; Ubiquitin/metabolism ; Valosin Containing Protein
    Chemical Substances Cell Cycle Proteins ; Ubiquitin ; Proteasome Endopeptidase Complex (EC 3.4.25.1) ; Adenosine Triphosphatases (EC 3.6.1.-) ; VCP protein, human (EC 3.6.4.6) ; Valosin Containing Protein (EC 3.6.4.6) ; Vcp protein, mouse (EC 3.6.4.6)
    Language English
    Publishing date 2010-03-01
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2454135-7
    ISSN 1554-8635 ; 1554-8627
    ISSN (online) 1554-8635
    ISSN 1554-8627
    DOI 10.4161/auto.6.2.11063
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Comparisons of ELISA and Western blot assays for detection of autophagy flux.

    Oh, Sung-Hee / Choi, Yong-Bok / Kim, June-Hyun / Weihl, Conrad C / Ju, Jeong-Sun

    Data in brief

    2017  Volume 13, Page(s) 696–699

    Abstract: We analyzed autophagy/mitophagy ... ...

    Abstract We analyzed autophagy/mitophagy flux
    Language English
    Publishing date 2017-07-04
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2786545-9
    ISSN 2352-3409
    ISSN 2352-3409
    DOI 10.1016/j.dib.2017.06.045
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Quantification of autophagy flux using LC3 ELISA.

    Oh, Sung-Hee / Choi, Yong-Bok / Kim, June-Hyun / Weihl, Conrad C / Ju, Jeong-Sun

    Analytical biochemistry

    2017  Volume 530, Page(s) 57–67

    Abstract: Macroautophagy (hereafter referred to as autophagy) is a degradation system that delivers cytoplasmic materials to lysosomes via autophagosomes. Autophagic flux is defined as a measure of autophagic degradation activity. Despite several methods for ... ...

    Abstract Macroautophagy (hereafter referred to as autophagy) is a degradation system that delivers cytoplasmic materials to lysosomes via autophagosomes. Autophagic flux is defined as a measure of autophagic degradation activity. Despite several methods for monitoring autophagic flux being currently utilized, interest in finding a highly accurate, sensitive and well-quantifiable assay is still growing. Therefore, we introduce a new approach analyzing autophagic flux in vitro and in vivo using enzyme-linked immunosorbent assay (ELISA) technique. In order to adapt this assay from LC3-II turnover measured by Western blot in the presence and absence of lysosomal inhibitors, we induced autophagy by starvation or rapamycin and mitophagy (mitochondrial degradation by autophagy) by CCCP in C2C12 myotubes for 8 h and in mice for 48 h with and without Bafilomycin A1 or colchicine treatment, respectively. Following subcellular fractionation of mouse skeletal muscle cells and tissue, cytosolic, membrane, and mitochondrial fractions were analyzed through a sandwich ELISA using two LC3 antibodies, LC3 capture and HRP-conjugated LC3 detection antibodies. Using this ELISA, changes in the membrane-bound or mitochondrion-associated LC3-II levels, and the ratio of the LC3-II from each fraction to LC3-I levels (cytosolic fraction) were evaluated for measuring autophagy and mitophagy flux. This study demonstrates that this ELISA was more sensitive and reliable to measure autophagic/mitophagic flux in both in vitro and in vivo, compared with the most commonly used LC3 turnover assay via Western blot.
    MeSH term(s) Animals ; Autophagy ; Blotting, Western ; Cell Compartmentation ; Cells, Cultured ; Enzyme-Linked Immunosorbent Assay/methods ; Lysosomes/metabolism ; Male ; Mice ; Mice, Inbred C57BL ; Microtubule-Associated Proteins/metabolism ; Mitochondria/metabolism ; Mitochondria/pathology ; Muscle Fibers, Skeletal/metabolism ; Muscle Fibers, Skeletal/pathology ; Muscle, Skeletal/metabolism ; Muscle, Skeletal/pathology
    Chemical Substances Map1lc3b protein, mouse ; Microtubule-Associated Proteins
    Language English
    Publishing date 2017-05-04
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1110-1
    ISSN 1096-0309 ; 0003-2697
    ISSN (online) 1096-0309
    ISSN 0003-2697
    DOI 10.1016/j.ab.2017.05.003
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Comparisons of ELISA and Western blot assays for detection of autophagy flux

    Oh, Sung-hee / Choi, Yong-bok / Kim, June-hyun / Weihl, Conrad C. / Ju, Jeong-sun

    Data in Brief. 2017 Aug., v. 13

    2017  

    Abstract: We analyzed autophagy/mitophagy flux in vitro (C2C12 myotubes) and in vivo (mouse skeletal muscle) following the treatments of autophagy inducers (starvation, rapamycin) and a mitophagy inducer (carbonyl cyanide m-chlorophenylhydrazone, CCCP) using two ... ...

    Abstract We analyzed autophagy/mitophagy flux in vitro (C2C12 myotubes) and in vivo (mouse skeletal muscle) following the treatments of autophagy inducers (starvation, rapamycin) and a mitophagy inducer (carbonyl cyanide m-chlorophenylhydrazone, CCCP) using two immunodetection methods, ELISA and Western blotting, and compared their working range, accuracy, and reliability. The ELISAs showed a broader working range than that of the LC3 Western blots (Table 1). Table 2 showed that data value distribution was tighter and the average standard error from the ELISA was much smaller than those of the Western blot, directly relating to the accuracy of the assay. Test-retest reliability analysis showed good reliability for three individual ELISAs (interclass correlation, ≥ 0.7), but poor reliability for three individual Western blots (interclass correlation, ≤ 0.4) (Table 3).
    Keywords Western blotting ; cyanides ; mice ; mitophagy ; myotubes ; rapamycin ; skeletal muscle ; starvation
    Language English
    Dates of publication 2017-08
    Size p. 696-699.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 2786545-9
    ISSN 2352-3409
    ISSN 2352-3409
    DOI 10.1016/j.dib.2017.06.045
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: Autophagy plays a role in skeletal muscle mitochondrial biogenesis in an endurance exercise-trained condition.

    Ju, Jeong-Sun / Jeon, Sei-Il / Park, Je-Young / Lee, Jong-Young / Lee, Seong-Cheol / Cho, Ki-Jung / Jeong, Jong-Moon

    The journal of physiological sciences : JPS

    2016  Volume 66, Issue 5, Page(s) 417–430

    Abstract: Mitochondrial homeostasis is tightly regulated by two major processes: mitochondrial biogenesis and mitochondrial degradation by autophagy (mitophagy). Research in mitochondrial biogenesis in skeletal muscle in response to endurance exercise training has ...

    Abstract Mitochondrial homeostasis is tightly regulated by two major processes: mitochondrial biogenesis and mitochondrial degradation by autophagy (mitophagy). Research in mitochondrial biogenesis in skeletal muscle in response to endurance exercise training has been well established, while the mechanisms regulating mitophagy and the interplay between mitochondrial biogenesis and degradation following endurance exercise training are not yet well defined. The purpose of this study was to examine the effects of a short-term inhibition of autophagy in response to acute endurance exercise on skeletal muscle mitochondrial biogenesis and dynamics in an exercise-trained condition. Male wild-type C57BL/6 mice performed five daily bouts of 1-h swimming per week for 8 weeks. In order to measure autophagy flux in mouse skeletal muscle, mice were treated with or without 2 days of 0.4 mg/kg/day intraperitoneal colchicine (blocking the degradation of autophagosomes) following swimming exercise training. The autophagic flux assay demonstrated that swimming training resulted in an increase in the autophagic flux (~100 % increase in LC3-II) in mouse skeletal muscle. Mitochondrial fusion proteins, Opa1 and MFN2, were significantly elevated, and mitochondrial fission protein, Drp1, was also increased in trained mouse skeletal muscle, suggesting that endurance exercise training promotes both mitochondrial fusion and fission processes. A mitochondrial receptor, Bnip3, was further increased in exercised muscle when treated with colchicine while Pink/Parkin protein levels were unchanged. The endurance exercise training induced increases in mitochondrial biogenesis marker proteins, SDH, COX IV, and a mitochondrial biogenesis promoting factor, PGC-1α but this effect was abolished in colchicine-treated mouse skeletal muscle. This suggests that autophagy plays an important role in mitochondrial biogenesis and this coordination between these opposing processes is involved in the cellular adaptation to endurance exercise training.
    MeSH term(s) Animals ; Autophagy/physiology ; Colchicine/pharmacology ; GTP Phosphohydrolases/genetics ; GTP Phosphohydrolases/metabolism ; Male ; Membrane Proteins/genetics ; Membrane Proteins/metabolism ; Mice ; Mitochondrial Proteins/genetics ; Mitochondrial Proteins/metabolism ; Muscle, Skeletal/metabolism ; Organelle Biogenesis ; Physical Conditioning, Animal/physiology ; Physical Endurance/physiology ; Swimming/physiology
    Chemical Substances BNip3 protein, mouse ; Membrane Proteins ; Mitochondrial Proteins ; GTP Phosphohydrolases (EC 3.6.1.-) ; Mfn2 protein, mouse (EC 3.6.1.-) ; Opa1 protein, mouse (EC 3.6.1.-) ; Colchicine (SML2Y3J35T)
    Language English
    Publishing date 2016-03-04
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 2234472-X
    ISSN 1880-6562 ; 1880-6546
    ISSN (online) 1880-6562
    ISSN 1880-6546
    DOI 10.1007/s12576-016-0440-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Increased autophagy accelerates colchicine-induced muscle toxicity.

    Ching, James K / Ju, Jeong Sun / Pittman, Sara K / Margeta, Marta / Weihl, Conrad C

    Autophagy

    2013  Volume 9, Issue 12, Page(s) 2115–2125

    Abstract: Colchicine treatment is associated with an autophagic vacuolar myopathy in human patients. The presumed mechanism of colchicine-induced myotoxicity is the destabilization of the microtubule system that leads to impaired autophagosome-lysosome fusion and ... ...

    Abstract Colchicine treatment is associated with an autophagic vacuolar myopathy in human patients. The presumed mechanism of colchicine-induced myotoxicity is the destabilization of the microtubule system that leads to impaired autophagosome-lysosome fusion and the accumulation of autophagic vacuoles. Using the MTOR inhibitor rapamycin we augmented colchicine’s myotoxic effect by increasing the autophagic flux; this resulted in an acute myopathy with muscle necrosis. In contrast to myonecrosis induced by cardiotoxin, myonecrosis induced by a combination of rapamycin and colchicine was associated with accumulation of autophagic substrates such as LC3-II and SQSTM1; as a result, autophagic vacuoles accumulated in the center of myofibers, where LC3-positive autophagosomes failed to colocalize with the lysosomal protein marker LAMP2. A similar pattern of central LC3 accumulation and myonecrosis is seen in human patients with colchicine myopathy, many of whom have been treated with statins (HMGCR/HMG-CoA reductase inhibitors) in addition to colchicine. In mice, cotreatment with colchicine and simvastatin also led to muscle necrosis and LC3 accumulation, suggesting that, like rapamycin, simvastatin activates autophagy. Consistent with this, treatment of mice with four different statin medications enhanced autophagic flux in skeletal muscle in vivo. Polypharmacy is a known risk factor for toxic myopathies; our data suggest that some medication combinations may simultaneously activate upstream autophagy signaling pathways while inhibiting the degradation of these newly synthesized autophagosomes, resulting in myotoxicity.
    MeSH term(s) Animals ; Autophagy/drug effects ; Autophagy/physiology ; Colchicine/pharmacology ; Disease Progression ; Humans ; Lysosomal Storage Diseases/chemically induced ; Lysosomal Storage Diseases/pathology ; Mice ; Mice, Inbred C57BL ; Muscle, Skeletal/drug effects ; Muscle, Skeletal/pathology ; Muscle, Skeletal/physiopathology ; Muscular Diseases/chemically induced ; Muscular Diseases/pathology ; Phagosomes/drug effects ; Phagosomes/pathology ; Simvastatin/pharmacology ; Up-Regulation/drug effects ; Vacuoles/drug effects ; Vacuoles/pathology
    Chemical Substances Simvastatin (AGG2FN16EV) ; Colchicine (SML2Y3J35T)
    Language English
    Publishing date 2013-10-31
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 2454135-7
    ISSN 1554-8635 ; 1554-8627
    ISSN (online) 1554-8635
    ISSN 1554-8627
    DOI 10.4161/auto.26150
    Database MEDical Literature Analysis and Retrieval System OnLINE

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