Comparison of the level of mitotic activity and duration of mitosis in normal and neoplastic mouse tissues during the 24-hour period

1976 ◽  
Vol 82 (5) ◽  
pp. 1704-1706 ◽  
Author(s):  
M. V. Berezkin
Keyword(s):  
Mitotic Activity ◽  
Duration Of Mitosis ◽  
Mouse Tissues

A comparative study of the duration of mitosis and interkinesis in mouse tissues by means of colchicine and irradiation

1964 ◽  
Vol 55 (1) ◽  
pp. 88-91
Author(s):  
O. I. Epifanova ◽  
A. I. Zosimovskaya ◽  
L. Ya. Lomakina ◽  
N. V. Grushina ◽  
I. N. Smolenskaya
Keyword(s):  
Comparative Study ◽  
Duration Of Mitosis ◽  
Mouse Tissues

An adrenocortical oncocytoma with unusual mitochondrial inclusions and cytoplasmic crystals

1994 ◽  
Vol 52 ◽  
pp. 250-251
Author(s):  
W.T. Gunning ◽  
G.D. Haselhuhn ◽  
E.R. Phillips ◽  
S.H. Selman
Keyword(s):  
Adrenal Gland ◽  
Salivary Glands ◽  
Mitotic Activity ◽  
Diagnostic Criteria ◽  
Vascular Invasion ◽  
Benign Neoplasm ◽  
Benign Tumors ◽  
Nuclear Morphology ◽  
Case Presentation ◽  
Microscopic Evidence

Within the last few years, adrenal cortical tumors with features concordant with the diagnostic criteria attributed to oncocytomas have been reported. To date, only nine reported cases exist in the literature. This report is the tenth case presentation of a presumptively benign neoplasm of the adrenal gland with a rare differentiation. Oncocytomas are well recognized benign tumors of the thyroid, parathyroid, and salivary glands and of the kidney. Other organs also give rise to these types of tumors, however with less frequency than the former sites. The characteristics generally used to classify a tumor as an oncocytoma include the following criteria: the tumor is 1) usually a solitary circumscribed mass with no gross nor microscopic evidence of metastasis (no tissue nor vascular invasion), 2) fairly bland in terms of mitotic activity and nuclear morphology, and 3) composed of large eosinophillic cells in which the cytoplasm is packed full of mitochondria (Figure 1).

Mitotic Activity Dynamics in Recalcitrant Seeds Acer sachharinum during Maturation and Germination

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 479c-479
Author(s):  
L. Kozeko ◽  
V. Troyan ◽  
L. Musatenko
Keyword(s):  
Cell Division ◽  
Mitotic Activity ◽  
Quiescent State ◽  
Activity Levels ◽  
Recalcitrant Seeds ◽  
Mature Embryos ◽  
Before And After ◽  
Orthodox Seeds ◽  
Mature Seeds ◽  
Activity Dynamics

In orthodox seeds the cell division within the embryo meristems arrests during maturation at embryo moisture content (MC) 65% to 47%, and the maturation completion and transition of seeds to quiescent state occurs at MC about 10%. The arrest of cycling happens asynchronously in different meristematic tissues during desiccation: first in shoot and then in root. The aim of this work was to define a mitotic activity dynamics in recalcitrant seeds with the high MC at maturation end and the absence of quiescent state characteristic of it. The object was seeds of Acer saccharinum, using widely for planting of greenery in Kiev city. The mitotic activity was determined in 0.5 mm of the embryo root pole (RP) and 0.5 mm of the shoot pole with embryo leaves (SP). The A. sachharinum seeds completed them maturation at MC 53% (FW basis). During maturation the mitotic index (MI) in RP decreased from 3.2% in immature seeds (at embryos MC 80%) to 0 in mature seeds and in SP–from 5.4% to 3.3%, respectively. Cell division in SP arrested by dehydration of mature embryos to MC 46% by PEG 6000 (30%). The seeds lost viability by desiccation to MC 34%. The mature seeds were able to germinate immediately after abscission. During seed germination the cell division reactived in RP and increased in SP already before root protrusion. In plantlets 10–15 mm long the MI increased to 8% in RP and 12% in SP. Thus, the strategy of immediate germination of recalcitrant A. sachharinum seeds includes a preservation of cell division in SP of mature embryos, in contrast with orthodox seeds, and high mitotic activity levels in meristems of germinating embryos before and after root protrusion.

EFFECT OF MMSC AND HSC ON REPARATIVE REGENERATION OF THE LIVER UNDER CONDITIONS OF ITS TOXIC DAMAGE

2020 ◽  
Vol 17 (3) ◽  
pp. 243-248
Author(s):  
I.Yu. Maklakova ◽  
◽  
V.V. Bazarniy ◽  
D.Yu. Grebnev ◽  
◽  
...  
Keyword(s):  
Dna Repair ◽  
Carbon Tetrachloride ◽  
Mitotic Activity ◽  
Liver Damage ◽  
Inflammatory Activity ◽  
Control Group ◽  
Nacl Solution ◽  
Repair Enzymes ◽  
Toxic Liver Damage ◽  
Hsc Transplantation

The aim of this study was to study the effect of combined MMSC and HSC transplantation on liver regeneration under conditions of toxic carbon tetrachloride damage. Materials and methods. The study was performed on white male mice with toxic liver damage by intraperitoneal administration of carbon tetrachloride at a dose of 50 µl per mouse once. An hour after modeling liver damage, placental MMSCs and HSCs were administered intravenously at a dose of 4 million cells/kg and 330 thousand cells/kg, respectively, suspended in 0.2 ml of 0.9% NaCl solution. Control group animals were given 0.9% NaCl solution-0.2 ml intravenously. On days 1, 3, and 7 after cell transplantation, changes in inflammatory activity in the liver were evaluated, and mitotic and apoptotic indices were determined. On the 7th day after the introduction of cells, the activity of DNA repair enzymes of the PARP family was analyzed. Results. Combined MMSC and HSC transplantation leads to a decrease in the index of inflammatory activity in the liver due to a decrease in necrosis, hepatocyte dystrophy, and a decrease in infiltration. As a result of the study, an increase in the activity of PARP repair enzymes was found, which led to a decrease in programmed cell death. Also, cotransplantation of MMSCs and HSCs was accompanied by increased mitotic activity of hepatocytes. Conclusion. Cotransplantation of MMSCs and HSCs under conditions of toxic liver damage reduces the inflammatory response, stimulates the mitotic activity of hepatocytes, and increases the activity of enzymes of the DNA repair system. Activation of the liver's reparative system, in turn, reduces the programmed death of hepatocytes.

scholarly journals Maturation of Mitochondrially Targeted Prx V Involves a Second Cleavage by Mitochondrial Intermediate Peptidase That Is Sensitive to Inhibition by H2O2

Antioxidants ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 346
Author(s):  
Juhyun Sim ◽  
Jiyoung Park ◽  
Hyun Ae Woo ◽  
Sue Goo Rhee
Keyword(s):  
Short Form ◽  
Mitochondrial Matrix ◽  
Mitochondrial Processing Peptidase ◽  
Mouse Tissues ◽  
N Terminus ◽  
Mitochondrial Intermediate Peptidase ◽  
Subsequent Degradation ◽  
Processing Peptidase ◽  
Mitochondria Targeting ◽  
Over Time

Prx V mRNA contains two in-frame AUG codons, producing a long (L-Prx V) and short form of Prx V (S-Prx V), and mouse L-Prx V is expressed as a precursor protein containing a 49-amino acid N-terminal mitochondria targeting sequence. Here, we show that the N-terminal 41-residue sequence of L-Prx V is cleaved by mitochondrial processing peptidase (MPP) in the mitochondrial matrix to produce an intermediate Prx V (I-Prx V) with a destabilizing phenylalanine at its N-terminus, and further, that the next 8-residue sequence is cleaved by mitochondrial intermediate peptidase (MIP) to convert I-Prx V to a stabilized mature form that is identical to S-Prx V. Further, we show that when mitochondrial H2O2 levels are increased in HeLa cells using rotenone, in several mouse tissues by deleting Prx III, and in the adrenal gland by deleting Srx or by exposing mice to immobilized stress, I-Prx V accumulates transiently and mature S-Prx V levels decrease in mitochondria over time. These findings support the view that MIP is inhibited by H2O2, resulting in the accumulation and subsequent degradation of I-Prx V, identifying a role for redox mediated regulation of Prx V proteolytic maturation and expression in mitochondria.

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