• Title/Summary/Keyword: 미토콘드리아

Search Result 763, Processing Time 0.025 seconds

Determination of Respiratory Activity of Mitochondria and Submitochondrial Particles by Using Dropping Mercury Electrode (적하수은전극을 이용한 미토콘드리아 및 Submitochondrial particles의 호흡활성측정)

  • Jung, Jin;Park, Sang-Gyu;Lee, Sang-Kee;Kim, Se-Ho
    • Applied Biological Chemistry
    • /
    • v.28 no.4
    • /
    • pp.271-277
    • /
    • 1985

  • A polarograph with specially designed cell compartment usable in kinetic study of the mitochondrial respiration of a small sized sample was made, and its performance and experimental conditions were examined. An applied potential (ca-1.2V vs. SCE) which gives rise to the second step reduction of oxygen caused a considerable level of a residual current independent of oxygen, which is temporarily interpreted as the reduction current of the membrane-bound redox material(s) of mitochondria. A potential corresponding to the first slop reduction of oxygen (ca-0.4V vs SCE) did not produce the residual current. Thus, it is suggested that a measurement of oxygen concentration in a sample of mitochondria and submitochondrial particles by using dropping mercury electrode should be done with an applied potential of about -0.4V vs SCE. Consumption of oxygen by mitochondria was observed to follow practically zero order kinetics. Its rate constant exhibited the proportional relationship with the respiratory activity of mitochondria. Usefulness of tile instrument was properly demonstrated in the work on the temperature effect on the respiration of mitochondria isolated from several plant 4issues which were selected on the basis of chilling susceptivity.

  • PDF

Complete Mitochondrial Genome of the Gypsy Moth, Lymantria dispar (Lepidoptera: Erebidae) (매미나방의 미토콘드리아 게놈 분석)

  • Na Ra, Jeong;Youngwoo, Nam;Wonhoon, Lee
    • Korean journal of applied entomology
    • /
    • v.61 no.3
    • /
    • pp.507-512
    • /
    • 2022

  • The Gypsy moth, Lymantria dispar (Linnaeus, 1758) (Lepidoptera: Erebidae) is a serious pest that attacks forest as well as fruit trees. We sequenced the 15,548 bp long complete mitochondrial genome (mitogenome) of this species. It consists of a typical set of genes (13 protein-coding genes, 2 rRNA genes, and 22 tRNA genes) and one major non-coding A + T-rich region. The orientation and gene order of the L. dispar mitogenome are identical to that of the ancestral type found in majority of the insects. Phylogenetic analyses using concatenated sequences of 13 PCGs and 2 rRNAs (13,568 bp including gaps) revealed that the L. dispar examined in our study, together with other geographical samples of L. dispar in a group forming the family Erebidae and consistently supported the monophyly of each family (Erebidae, Euteliidae, Noctuidae, Nolidae and Notodontidae), generally with the highest nodal supports.

  • https://doi.org/10.5656/KSAE.2022.08.0.051 인용 PDF KSCI

Resveratrol Ameliorates NMDA-induced Mitochondrial Injury by Enhanced Expression of Heme Oxygenase-1 in HT-22 Neuronal Cells (NMDA를 처리한 HT-22 신경세포에서 미토콘드리아 손상을 완화하는 레스베라트롤의 보호 효과와 헴 산화효소-1의 역할)

  • Kang, Jae Hoon;Woo, Jae Suk
    • Journal of Life Science
    • /
    • v.32 no.1
    • /
    • pp.11-22
    • /
    • 2022

  • N-methyl-D-aspartate (NMDA) receptors have received considerable attention regarding their involvement in glutamate-induced neuronal excitotoxicity. Resveratrol has been shown to exhibit neuroprotective effects against this kind of overactivation, but the underlying cellular mechanisms are not yet clearly understood. In this study, HT-22 neuronal cells were treated with NMDA in Mg2+-free buffer and subsequently used as an experimental model of glutamate excitotoxicity to elucidate the mechanisms of resveratrol-induced neuroprotection. We found that NMDA treatment causes a drop in MTT reduction ability, disrupts inside-negative transmembrane potential of mitochondria, depletes cellular ATP levels, and stimulates intracellular ROS production. Double fluorescence imaging studies demonstrated an increased formation of mitochondrial permeability transition (MPT) pores accompanied by apoptotic cell death, while cobalt protoporphyrin and bilirubin showed protective effects against NMDA-induced mitochondrial injury. On the other hand, zinc protoporphyrin IX significantly attenuated the protective effects of resveratrol which was itself shown to enhance heme oxygenase-1 (HO-1) mRNA and protein expression levels. In cells transfected with HO-1 small interfering RNA, resveratrol failed to suppress the NMDA-induced effects on MTT reduction ability and MPT pore formation. The present study suggests that resveratrol may prevent mitochondrial injury in NMDA- treated HT-22 cells and that enhanced expression of HO-1 is involved in the underlying cellular mechanism.

  • https://doi.org/10.5352/JLS.2022.32.1.11 인용 PDF KSCI HTML