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Bhoora S, Pillay TS, Punchoo R. Cholecalciferol induces apoptosis via autocrine metabolism in epidermoid cervical cancer cells. Biochem Cell Biol 2022; 100:387-402. [PMID: 35724427 DOI: 10.1139/bcb-2022-0049] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The anti-cancer effects of vitamin D are of fundamental interest. Cholecalciferol is sequentially hydroxylated endogenously to calcidiol and calcitriol. Here, SiHa epidermoid cervical cancer cells were treated with cholecalciferol (10 - 2600 nM). Cell count and viability were assayed using crystal violet and trypan blue, respectively. Apoptosis was assessed using flow cytometry for early and late biomarkers along with brightfield microscopy and transmission electron microscopy. Autocrine vitamin D metabolism was analysed by qPCR and immunoblotting for activating enzymes; 25-hydroxylases (CYP2R1 and CYP27A1) and 1α-hydroxylase (CYP27B1); the catabolic 24-hydroxylase (CYP24A1); and the vitamin D receptor (VDR). Data were analysed using one-way ANOVA and Bonferroni post hoc test, and p<0.05 was considered significant. After cholecalciferol, cell count (p=0.011) and viability (p<0.0001) decreased, apoptotic biomarkers were positive, mitochondrial membrane potential decreased (p=0.0145), and phosphatidylserine externalisation (p=0.0439); terminal caspase activity (p=0.0025) and nuclear damage (p=0.004) increased. Microscopy showed classical features of apoptosis. Gene and protein expression were concordant. Immunoblots revealed increased CYP2R1 (p = 0.021), VDR (p=0.04) and CYP24A1 (p=0.0274) and decreased CYP27B1 (p=0.031). We conclude that autocrine activation of cholecalciferol to calcidiol may mediate VDR signalling of growth inhibition and apoptosis in SiHa cells.
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Affiliation(s)
- Sachin Bhoora
- Faculty of Health Sciences University of Pretoria, Department of Chemical Pathology, Pretoria, Gauteng, South Africa;
| | - Tahir S Pillay
- Faculty of Health Sciences University of Pretoria, Department of Chemical Pathology, Pretoria, Gauteng, South Africa.,National Health Laboratory Service, 70685, Tshwane Academic Division, Johannesburg, Gauteng, South Africa.,University of Cape Town, 37716, Chemical Pathology, Cape Town, South Africa;
| | - Rivak Punchoo
- National Health Laboratory Service, 70685, Chemical Pathology, Johannesburg, South Africa.,University of Pretoria Faculty of Health Sciences, 72042, Chemical Pathology, Pretoria, South Africa;
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Abstract
Mitochondria are customarily acknowledged as the powerhouse of the cell by virtue of their indispensable role in cellular energy production. In addition, it plays an important role in pluripotency, differentiation, and reprogramming. This review describes variation in the stem cells and their mitochondrial heterogeneity. The mitochondrial variation can be described in terms of structure, function, and subcellular distribution. The mitochondria cristae development status and their localization patterns determine the oxygen consumption rate and ATP production which is a central controller of stem cell maintenance and differentiation. Generally, stem cells show spherical, immature mitochondria with perinuclear distribution. Such mitochondria are metabolically less energetic and low polarized. Moreover, mostly glycolytic energy production is found in pluripotent stem cells with a variation in naïve stem cells which perform oxidative phosphorylation (OXPHOS). This article also describes the structural and functional journey of mitochondria during development. Future insight into underlying mechanisms associated with such alternation in mitochondria of stem cells during embryonic stages could uncover mitochondrial adaptability on cellular demands. Moreover, investigating the importance of mitochondria in pluripotency maintenance might unravel the cause of mitochondrial diseases, aging, and regenerative therapies.
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Abstract
Mitochondria play key roles in the life and death of cells. We investigated whether mitochondria represent morphologically continuous entities within single intact cells. Physical continuity of mitochondria was determined by three-dimensional reconstruction of fluorescence from mitochondrially targeted DsRed1 or tetra-methyl rhodamine ethyl ester (TMRE). The mitochondria of pancreatic acinar, porcine aortic endothelial (PAE) cells, COS-7 cells and SH-SY5Y cells and neocortical astrocytes all displayed heterogeneous distributions and were of varying sizes. In general, there was a denser aggregation of mitochondria in perinuclear positions than in the cell periphery, where individual isolated mitochondria could clearly be seen. DsRed1 was found to be highly mobile within the matrix of individual mitochondria, with an estimated linear diffusion rate of 1 micro m s(-1). High-intensity irradiation of subcellular regions bleached the fluorescence of mitochondrially targeted DsRed1, but did not cause the mitochondria to depolarise or fragment. A lack of rapid fluorescence-recovery-after-photobleaching (FRAP) of DsRed1 indicated lumenal discontinuity between mitochondria. We observed a slow (half-time approx. 20 min) recovery of DsRed1 fluorescence within the irradiated area that was attributed to mitochondrial movement or fusion of unbleached and bleached organelles. Mitochondria were not electrically coupled, since typically only individual mitochondria were observed to depolarise following irradiation of TMRE-loaded cells. Our data indicate that the mitochondria within individual cells are morphologically heterogeneous and unconnected, thus allowing them to have distinct functional properties.
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Affiliation(s)
- Tony J Collins
- Laboratory of Molecular Signalling, The Babraham Institute, Babraham, Cambridge, CB2 4AT, UK.
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Collins TJ, Berridge MJ, Lipp P, Bootman MD. Mitochondria are morphologically and functionally heterogeneous within cells. EMBO J 2002; 21:1616-27. [PMID: 11927546 PMCID: PMC125942 DOI: 10.1093/emboj/21.7.1616] [Citation(s) in RCA: 433] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
We investigated whether mitochondria represent morphologically continuous and functionally homogenous entities within single intact cells. Physical continuity of mitochondria was determined by three-dimensional reconstruction of fluorescence from mitochondrially targeted DsRed1 or calcein. The mitochondria of HeLa, PAEC, COS-7, HUVEC, hepatocytes, cortical astrocytes and neuronal cells all displayed heterogeneous distributions and were of varying sizes. There was a denser aggregation of mitochondria in perinuclear positions than in the cell periphery, where individual isolated mitochondria could be seen clearly. Using fluorescence-recovery after photobleaching, we observed that DsRed1 and calcein were highly mobile within the matrix of individual mitochondria, and that mitochondria within a cell were not lumenally continuous. Mitochondria were not electrically coupled, since only individual mitochondria were observed to depolarize following irradiation of TMRE-loaded cells. Functional heterogeneity of mitochondria in single cells was observed with respect to membrane potential, sequestration of hormonally evoked cytosolic calcium signals and timing of permeability transition pore opening in response to tert-butyl hydroperoxide. Our data indicate that mitochondria within individual cells are morphologically heterogeneous and unconnected, allowing them to have distinct functional properties.
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Affiliation(s)
- Tony J. Collins
- Laboratory of Molecular Signalling, The Babraham Institute, Babraham, Cambridge CB2 4AT and Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK Corresponding author e-mail:
| | - Michael J. Berridge
- Laboratory of Molecular Signalling, The Babraham Institute, Babraham, Cambridge CB2 4AT and Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK Corresponding author e-mail:
| | - Peter Lipp
- Laboratory of Molecular Signalling, The Babraham Institute, Babraham, Cambridge CB2 4AT and Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK Corresponding author e-mail:
| | - Martin D. Bootman
- Laboratory of Molecular Signalling, The Babraham Institute, Babraham, Cambridge CB2 4AT and Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK Corresponding author e-mail:
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Blackmer JL, Lindley VA, Byrne DN. Histological examination of flight muscle development and breakdown inBemisia tabaci (Homoptera: Aleyrodidae): Relationship to age and flight behvior. J Morphol 1995; 226:213-221. [DOI: 10.1002/jmor.1052260208] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Bereiter-Hahn J, Vöth M. Dynamics of mitochondria in living cells: shape changes, dislocations, fusion, and fission of mitochondria. Microsc Res Tech 1994; 27:198-219. [PMID: 8204911 DOI: 10.1002/jemt.1070270303] [Citation(s) in RCA: 601] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Mitochondria are semi-autonomous organelles which are endowed with the ability to change their shape (e.g., by elongation, shortening, branching, buckling, swelling) and their location inside a living cell. In addition they may fuse or divide. These dynamics are discussed. Dislocation of mitochondria may result from their interaction with elements of the cytoskeleton, with microtubules in particular, and from processes intrinsic to the mitochondria themselves. Morphological criteria and differences in the fate of some mitochondria argue for the presence of more than one mitochondrial population in some animal cells. Whether these reflect genetic differences remains obscure. Emphasis is laid on the methods for visualizing mitochondria in cells and following their behaviour. Fluorescence methods provide unique possibilities because of their high resolving power and because some of the mitochondria-specific fluorochromes can be used to reveal the membrane potential. Fusion and fission often occur in short time intervals within the same group of mitochondria. At sites of fusion of two mitochondria material of the inner membrane, the matrix compartment seems to accumulate. The original arrangement of the fusion partners is maintained for some minutes. Fission is a dynamic event which, like fusion, in most cases observed in vertebrate cell cultures is not a straight forward process but rather requires several "trials" until the division finally occurs. Regarding fusion and fission hitherto unpublished phase contrast micrographs, and electron micrographs have been included.
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Affiliation(s)
- J Bereiter-Hahn
- Cinematic Cell Research Group, Johann Wolfgang Goethe Universität, Frankfurt am Main, Germany
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Affiliation(s)
- J Bereiter-Hahn
- Cinematic Cell Research Group, Johann Wolfgang Goethe Universität Frankfurt am Main, Federal Republic of Germany
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Gartner LP. The fine structural morphology of the midgut of aged Drosophila: a morphometric analysis. Exp Gerontol 1987; 22:297-304. [PMID: 3117581 DOI: 10.1016/0531-5565(87)90008-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The midguts of 1-day and 72 day-old fruitflies were examined morphometrically at the electron microscopic level. The major alterations noted were that the number of supranuclear mitochondria decreased by approximately 50%, while the volume of individual mitochondria doubled as a function of age. Moreover, approximately 29% of the nuclear volume of old flies, was occupied by inclusion bodies as was 19% of the supranuclear cytoplasmic volume. Additionally, the surface density of rough endoplasmic reticulum was reduced to more than half that of young flies. It is suggested that the functional capability of the parenchymal cells become debilitated due to the presence of these inclusion bodies, and that the cell's ability to manufacture proteins and produce energy are seriously hindered by the mitochondrial alterations and reduction in the surface density of the rough endoplasmic reticulum.
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Affiliation(s)
- L P Gartner
- Department of Anatomy, Dental School, University of Maryland, Baltimore 21201
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Panno JP, Nair KK. Age-related chromatin condensation in flight muscle nuclei of the adult male housefly, Musca domestica. Exp Gerontol 1985; 20:341-5. [PMID: 3833545 DOI: 10.1016/0531-5565(85)90014-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Computer analysis of indirect flight muscle nuclei from the adult male housefly, M. domestica, has shown significant change with age in the chromatin condensation pattern. The pattern was analyzed by examining low, medium, and high density chromatin components (LDC, MDC, HDC). No significant change occurred in HDC with age, and the amount and distribution of LDC and MDC remain relatively stable between Day 1 and Day 4 post-eclosion. However, the analysis showed a significant increase in the amount of MDC with a corresponding decrease in the amount of LDC between Day 4 and Day 14. This exchange was accompanied by a significant redistribution of both components. These results are discussed with reference to the biochemical and ultrastructural profile of the flight muscle with age, and to age-related changes in the condensation pattern of specific brain and Malpighian tubule nuclei described earlier.
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Aging in Insects. Biochemistry 1985. [DOI: 10.1016/b978-0-08-030811-1.50024-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
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Turturro A, Shafiq SA. Freeze-fracture analysis of the effects of age and 2,4-dinitrophenol on the morphology of flight muscle mitochondria of Musca domestica L. Mech Ageing Dev 1981; 16:191-204. [PMID: 7266080 DOI: 10.1016/0047-6374(81)90095-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Morphometric comparison of freeze-fractured mitochondria in flight muscles of adult (37-day-old) and old (68-day-old) houseflies revealed a 28% decrease of cristae in the old flies. The major membrane change with age was an increase in the 90-120-A particles in the inner membrane external face concomitant with a loss of particle clusters associated with the openings of the cristae on to the inner membrane. In vitro treatment of flight muscle with 2,4-dinitrophenol, and uncoupler of mitochondrial respiration, did not produce this change but resulted in the formation of smooth particle-free vesicular swellings in the mitochondria. Such swelling were infrequent in the old muscle. The cause for the aging change is not clear, but a reduction in the ability of the intramembranous particles to aggregate, either through modification of altered synthesis, is indicated.
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Collatz KG, Collatz S. Age dependent ultrastructural changes in different organs of the mecopteran fly Panorpa vulgaris. Exp Gerontol 1981; 16:183-93. [PMID: 7286097 DOI: 10.1016/0531-5565(81)90044-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Abstract
Quantitative measurements of glycogen in aging bruchids showed there was a considerable decrease (> 50%) with age except on the fifth day when an increase was observed, followed by a decrease on the sixth day. The variations in glycogen content with age suggests that glycogen serves as one of the energy sources responsible for the maintenance of metabolism in the process of aging in bruchids.
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Greenwood M, Huddart H. The effect of an organochlorine and an organophosphorus insecticide on the fine structure of flight muscle and the implications for the maintenance of contractility. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. A, COMPARATIVE PHYSIOLOGY 1975; 51:475-81. [PMID: 237669 DOI: 10.1016/0300-9629(75)90397-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Carroll FE, Carroll GC. Senescence and death of the conidiogenous cell in Stemphylium botryosum Wallroth. ARCHIV FUR MIKROBIOLOGIE 1973; 94:109-24. [PMID: 4360416 DOI: 10.1007/bf00416686] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Satav JG, Rajwade MS, Katyare SS, Netrawali MS, Fatterpaker P, Sreenivasan A. The significance of promitochondrial structures in rat liver for mitochondrial biogenesis. Biochem J 1973; 134:687-95. [PMID: 4749269 PMCID: PMC1177865 DOI: 10.1042/bj1340687] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
1. The heavy, light and fluffy mitochondrial fractions obtained by differential centrifugation were further characterized with respect to their protein synthesizing ability in vitro, their nucleic acid content, buoyant density of their DNA and ultrastructure. 2. The light mitochondrial fraction synthesized proteins in vitro at a rate 4-5 times as high as heavy and fluffy mitochondria. The incorporation ability of this fraction was also maximally affected by the thyroid status of the animal. The radioactivity in leucyl-tRNA of the light mitochondrial fraction was about 3-4 times as high as that of the other two fractions. 3. The heavy, light and fluffy mitochondrial fractions contained small but consistent amounts of RNA and DNA. Although the DNA content was the same in all mitochondria fractions, the light mitochondria contained relatively more RNA. The buoyant density of DNA from all the fractions was 1.701g/cm(3). 4. Electron microscopy revealed that the heavy mitochondria have a typical mitochondrial architecture, with densely packed cristae and a well developed double membrane. Light mitochondria were also surrounded by double membranes, but were smaller in size and contained less cristae. The fluffy fraction consisted of a mixture of well formed mitochondria and those in the process of degradation. 5. The significance of these findings in relation to mammalian mitochondrial genesis is discussed.
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Sacktor B, Shimada Y. Degenerative changes in the mitochondria of flight muscle from aging blowflies. J Cell Biol 1972; 52:465-77. [PMID: 4333452 PMCID: PMC2108640 DOI: 10.1083/jcb.52.2.465] [Citation(s) in RCA: 75] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Mitochondria from flight muscle of aging blowflies, Phormia regina, were examined morphologically and biochemically with the electron microscope. An age-dependent degeneration of the mitochondria that is characterized, in part, by the reorganization of the inner membrane into myelin-like whorls has been found. The concentric rings increase in size and number, eventually replacing the normal cristal conformation. Glycogen rosettes are frequently seen in the center of the whorl and may represent the intrusion into the mitochondria of the glycogen in the cytoplasmic matrix of the muscle. The degenerating mitochondria are not associated with lysosomal activity, as indicated by the absence of acid phosphatase. An intense acid phosphatase activity is noted, however, in the dyad, comprising elements of the T system and sarcoplasmic reticulurn. Cytochrome oxidase is active in the ultrastructurally intact portion of the mitochondrion but activity is not evident in that part of the mitochondrion that has undergone morphological change. Thus, the ultrastructural degradation of the mitochondria is correlated with a decrease in biochemical function. This suggests a correspondence between a decrease in the bioenergetic capacity of the flight muscle and a decline in the ability of the aged insect to fly.
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Davison TF. Ultrastructural changes in sarcosomes after exposure of adult Calliphora erythrocephala to lethal and sub-lethal high temperatures. J Cell Physiol 1971; 78:49-58. [PMID: 4939030 DOI: 10.1002/jcp.1040780108] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Aaronson S, Behrens U, Orner R, Haines TH. Ultrastructure of intracellular and extracellular vesicles, membranes, and myelin figures produced by Ochromonas danica. JOURNAL OF ULTRASTRUCTURE RESEARCH 1971; 35:418-30. [PMID: 4111037 DOI: 10.1016/s0022-5320(71)80003-5] [Citation(s) in RCA: 47] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Sohal RS, Allison VF. Age-related changes in the fine structure of the flight muscle in the house fly. Exp Gerontol 1971; 6:167-72. [PMID: 5562897 DOI: 10.1016/s0531-5565(71)80015-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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