Outbred male mice weighing 220 ± 25–30 g were used in the experiments. One hundred and twenty mice were divided into three groups: control (untreated), subcutaneous sunflower oil (active control), and 0.5–0.7 mg 7,12-dimethylbenz(α)anthracene (DMBA) dissolved in sunflower oil. Liver mitochondria were isolated 1–4, 10–18, and 35 d after the administration of DMBA. The homogenate was centrifuged at 600 × g for 10 min and the supernatant at 14000 for 10 min. The mitochondrial precipitates were first resuspended in the isolation medium, then in 0.25 M sucrose and centrifuged twice at 14000 × g for 10 min. The isolation medium contained 0.5 M sucrose and 0.001 EDTA, pH 7.4. Mouse cells (1 ml) were incubated in plexiglass and fused quartz cells in an incubator. The rate of O2 consumption was measured using a Clarke oxygen electrode [3]. The incubation medium contained 0.15 M sucrose, 0.015 M KCl, 5ml M KH2PO4, and 2.5 M MgCl2, pH 7.4.
The dynamics of the optical density of the suspension (2 ml incubation medium, 3.5 mg mitochondrial protein, 0.2 µmol methylene blue, and 10 mM succinate) were determined using 620 nm wavelength, continuous transmission, monochromatic light. The spontaneous luminescence of empty incubation cells was determined using a photomultiplier PM-106 [1]. Low luminescence of the incubation cells was achieved by wrapping in photo paper and storing them in complete darkness for at least 14 d. Quartz cells were warmed at 120°С for 24 h.
The results did not indicate the inhibition of metabolic processes in mouse liver mitochondria due to the carcinogen. The rate of endogenous respiration in the mouse liver mitochondria exposed to DMBA was 42% higher than in the control.
Succinate substrate increased mitochondrial respiration in carcinogenic mice by 23% and glutamate by 26%. The phosphorylation rate increased by 15% after exposure to the carcinogen, and oxygen consumption during the phosphorylation period decreased by 8.5%. The rate of dissociated mitochondrial respiration under 2,4-dinitrophenol in the DMBA group increased by 34% compared with that in the control. The respiratory control ratio (RCR) differed significantly between the DMBA and control group with succinate or glutamate substrates; 3.2, 3.4, and 3.3 with succinate and 3.6, 3.8, and 3.4 with glutamate. When using glutamate + malate as a substrate, the RCR of the DMBA group increased by 20%.
Thus, the increased metabolism and stimulation due to the conjugating factors (high RCR, oxygen consumption during reduction of phosphorylation, and decreased ATPase activity) in the early stages of carcinogenesis indicate the involvement of carcinogenic molecules in regulating the level of interaction between the molecular substrate and cell organelles, suggesting a unified mechanism of activation associated with the general characteristics of mitochondrial membranes. As a result of this interaction, the generalized characteristics of the membranes may acquire new values. For example, increasing Δ µ̃ Η+increases the degree of deviation of the system from the equilibrium between the redox potential of the pair in the proton transferring portion of the chain\, i.e., there is an impact on the main factor in the regulation of respiration [8].
ADMBA metabolites are electrophilic reactive radicals. The addition of such substances to the mitochondrial membrane could ultimately increase the permeability of the membrane and decrease the number of protons transferred by ATP synthetase. The value of Δµ̃H+ decreases with an increase in the CmΗ+ membrane conductivity; therefore, the thermodynamic ability to synthesize ATP should decrease. However, this was not observed in our study. The non-chemiosmotic parameters of energized mitochondrial RCR, p/o, the magnitude of endogenous respiration) can be reduced to the value CmΗ+ [8]. Thus, the energization of mitochondrial metabolism is not determined by a local effect of the membrane they are attached to due to their donor-acceptor properties and electrophilic DMBA metabolites. This is a more rational interpretation of data on the stimulating effect of DMBA within the framework of the general theory developed in studies on “distant interactions” between spatially separated, non-equilibrium, excited electronic levels of certain chemical elements involved in the reaction [5,10,15]. Thus, the non-chemical interaction of DMBA molecules and mitochondria can be viewed as the interaction of two spatially separated electronically excited systems (outer electron shells of enzyme molecules of the electron transfer chain of mitochondria and zones K and L of DMBA molecules).
In the presence of high physical organization of the intracellular space (mitochondria and microtubule system of hollow waveguide resonators with zones of high charge density) [10, 12], the interaction occurs due to coherent electromagnetic radiation arising during electronic transitions in the valence zone. In the early stages, DMBA molecules may act as “catalysts” to create anomalous electronically excited states in poly-enzyme systems without forming strong chemical bonds, causing a polyfunctional carcinogenic activity [2].
Table 1
Metabolic changes in mouse liver mitochondria after subcutaneous injection of DMBA
|
Substrate and condition Breath rate ng atoms O2/min/mg.mitochondrial protein
|
Control group
|
Active control group
|
DMBA group
|
% difference between DMBA and active control
|
P-value
|
|
1
|
2
|
3
|
4
|
5
|
6
|
|
Endogenous respiration
|
3.6 ± 0.2
|
4.6 ± 0.3
|
5.2 ± 0.25
|
13
|
0.05
|
| |
n = 66
|
n = 46
|
n = 49
|
|
|
|
Succinate 5mM
V-0
|
11, 03 ± 0.5 n = 36
|
14.26 ± 0.7
n = 23
|
14.06 ± 0.6
n = 34
|
-1.4
|
0.05
|
|
Glutamate 5mM - V-0
|
3.7 ± 0.5 n = 16
|
4.2 ± 0.5 n = 10
|
6.0 ± 0.35 n = 12
|
42
|
≤ 0.01 *
|
|
Glutamate 5mM + malate 5mM
V-0
|
5.4 ± 0.4 n = 14
|
3.17 ± 0.4 n = 4
|
5.5 ± 0.5 n = 10
|
75
|
≤ 0.01 *
|
|
Succinate 5mM + ADF 0,2 µM
V-3/1
|
38.4 ± 1.6
n = 36
|
48.91 ± 2.1
n = 23
|
47.6 ± 1.15 n = 33
|
-2.7
|
0.05
|
|
Glutamate 5 mM + ADP 0,2 µ M
V-3/1
|
20.01 ± 1.05 n = 16
|
20.9 ± 1,2 n = 10
|
24.2 ± 1.1 n = 9
|
15.8
|
0.05
|
|
Glutamate 5mM + malate 5mM + ADF 0,2µM
V-3/1
|
27.1 ± 2.4
n = 14
|
22.3 ± 1.2 n = 5
|
24.9 ± 1.7 n = 8
|
11.7
|
0.05
|
|
Succinate5mM
V- 4/1
|
12.9 ± 0.5
n = 36
|
14.1 ± 0.6 n = 23
|
16.2 ± 0.7 n = 33
|
14.9
|
0.05
|
|
Glutamate 5mM
V- 4/1
|
5.8 ± 0.4 n = 16
|
4.6 ± 0.2 n = 10
|
7.5 ± 0.5 n = 9
|
63
|
≤ 0,001*
|
|
5mMGlutamate + malate5mM
V-4/1
|
7.1 ± 0.5
n = 14
|
5.7 ± 0.3 n = 5
|
6.4 ± 0.5 n = 8
|
12
|
0.05
|
|
Succinat5mM + ADP 0,2µ M
V-3/2
|
42.2 ± 1.6
n = 31
|
47.4 ± 1.1 n = 32
|
52.1 ± 1.7 n = 10
|
9.9
|
≤ 0.05*
|
|
Glutamate 5mM + ADP 0,2µM
V-3/2
|
22.4 ± 0.9 n = 16
|
22.1 ± 1.0 n = 10
|
29.2 ± 1.2 n = 12
|
32.1
|
≤ 0,001*
|
|
Glutamate5mM + malate5mM +
ADP 0,2µ M V-3/2
|
27.4 ± 1.7
n = 14
|
23.7 ± 1,5 n = 5
|
26.2 ± 1.9
n = 10
|
10.5
|
0.05
|
|
Succinate 5mM V- 4/2
|
12.2 ± 0.5
n = 25
|
13,95 ± 0.4
n = 31
|
14.1 ± 0.5
n = 24
|
1.1
|
0.05
|
|
Glutamate 5 mM V-4/2
|
6,9 ± 0.6
n = 16
|
6.2 ± 0, 4 n = 10
|
8.8 ± 0.4
n = 11
|
41.9
|
≤ 0,001*
|
|
Glutamate5mM + malate5mM
V-4/2
|
7.94 ± 0.5
n = 14
|
6.1 ± 0.2 n = 5
|
6.7 ± 0.5
n = 10
|
9.8
|
0.05
|
|
Succinate 5 mm + DNF 0.1µ M
|
47.7 ± 3.3
n = 12
|
53.6 ± 2.3 n = 18
|
73.1 ± 3.3
n = 20
|
36.4
|
≤ 0.001*
|
|
Glutamate5 mM + DNF 0.1 µ M
|
25.7 ± 1.9 n = 11
|
25.7 ± 1.7 n = 9
|
31.5 ± 1.2
n = 9
|
22.6
|
≤ 0.05 *
|
|
Glutamate5mM + malate5mM +
DNF 0.1 µ M
|
22.4 ± 1.8
n = 9
|
19, 04 ± 1.7
n = 5
|
21.6 ± 2.0 n = 10
|
13.4
|
0.05
|
|
Rate of phosphorylation of nmol ADP/min/mg.mitochondrial protein
|
|
1
|
2
|
3
|
4
|
5
|
6
|
|
Succinate 5 mm + ADF 0.2.µM - V-3/1
|
87.4 ± 3.2
n = 36
|
87.8 ± 3.0
n = 31
|
98.06 ± 2.5
n = 36
|
11.6
|
≤ 0.01 *
|
|
Glutamate 5mM + ADF 0.2µ M
V-3/1
|
61.6 ± 1.9
n = 16
|
63.4 ± 3.9 n = 10
|
65.2 ± 6.2 n = 12
|
2.8
|
0.05
|
|
Glutamate 5mM + malate 5mM + ADF 0.2µM
V-3/1
|
88.96 ± 9.3
n = 14
|
66.3 ± 6.0 n = 5
|
76.2 ± 7.0 n = 10
|
14.9
|
0.05
|
|
5 mM succinate + ADP0, 0.2 µM - V-3/2
|
94.4 ± 2.5 n = 30
|
93.3 ± 3.3 n = 31
|
112.6 ± 4.8 n = 24
|
20.7
|
≤ 0.01 *
|
|
Glutamate 5mM + ADF 0.2µM
V-3/2
|
69.2 ± 3.2
n = 16
|
65.8 ± 3.9 n = 9
|
71.99 ± 3.6 n = 12
|
9.4
|
0.05
|
|
Glutamate 5 mM + malate 5 mM + ADF 0.2 µM V-3/2
|
81.4 ± 5.4
n = 14
|
67.4 ± 4.0 n = 5
|
80.6 ± 6.0 n = 10
|
19.6
|
0.05
|
|
P/OSuccinate5mM + ADP 0.2µM, V-3/1
|
2.3 ± 0.1
n = 36
|
1.96 ± 0.04 n = 31
|
2.1 ± 0.1 n = 36
|
7.1
|
0.05
|
|
P/O Glutamate 5 mM + ADP 0.2 µM, V-3/1
|
3.2 ± 0.1 n = 16
|
3.04 ± 0.1 n = 10
|
2.5 ± 0.15 n = 12
|
-17.8
|
≤0.0 1*
|
|
P/ O Glutamate 5mM + malate 5mM + ADF 0.2 µM V-3/1
|
3.3 ± 0.2
n = 14
|
2.98 ± 01 n = 5
|
3.0 ± 0.2 n = 10
|
0.67
|
0.05
|
|
P/O Succinate 5 mM + ADP 0.2 µM
V-3/2
|
2.3 ± 01 n = 30
|
2.0 ± 0.1 n = 31
|
2.34 ± 0.1 n = 24
|
17
|
≤ 0.01*
|
|
P/O Glutamate 5mM + ADF 0.2 µM
V-3/2
|
3.12 ± 0.14
n = 16
|
2.95 ± 0.2 n = 9
|
2.46 ± 1.0
n = 12
|
16
|
0.05
|
|
P/O Glutamate 5 mM + malate 5 mM + ADF 0.2 µM V-3/2
|
2.99 ± 0.14 n = 14
|
2.84 ± 0.1 n = 5
|
3.044 ± 0.1 n = 10
|
7.2
|
0.05
|
|
ATPase (by Lardy)
|
|
1
|
2
|
3
|
4
|
5
|
6
|
|
Succinate ADP V-3/1
|
1.18 ± 0.02 n = 36
|
1.12 ± 0.03 n = 31
|
1.12 ± 0. 03 n = 35
|
|
0.05
|
|
Succinat ADP V-3/2
|
1.02 ± 0.04 n = 25
|
1.04 ± 0.04 n = 41
|
1.06 ± 0.03 n = 25
|
1.9
|
0.05
|
|
Glutamate ADP V-3/1
|
1.9 ± 0. 2 n = 16
|
1.2 ± 0.1 n = 10
|
1.33 ± 0.06 n = 12
|
10.8
|
0.05
|
|
Glutamate ADP V-3/2
|
1.2 ± 0.06
n = 16
|
1.4 ± 0.1
n = 10
|
1.16 ± 0.1
|
-17
|
≤ 0.05 *
|
|
Glutamate + malateADP V-3/1
|
1.4 ± 0.1 n = 14
|
1.9 ± 0.02 n = 5
|
1.1 ± 0. 1 n = 10
|
42
|
≤ 0.01 *
|
|
Glutamate + malate ADP-V3/2
|
1.14 ± 0.06 n = 14
|
1.1 ± 0.06
n = 5
|
1.15 ± 0.05 n = 10
|
4.4
|
0.05
|
Note.(V3/1): first addition of ADP; (V3/2): second addition of AD; DNF:addition of dinitrophenol, (V-4/1): relaxation after the first addition of ADP; (V-4/2): relaxation after second addition of ADP; (V-0): rest before first addition of ADP; n:number of experiments; *: P-value ≤ 0.0
The "distant" interaction non-equilibrium, excited electronic systems, consider the effect on mitochondria of fused quartz and polymethyl methacrylate (plexiglass), substances used in experimental oncology for inducing tumors.
Determined the respiration rate of rat liver mitochondria at 6 h after isolation in 15 16 from a single mouse liver mitochondrial preparation using both quartz and plexiglass incubation cells and found that they exhibited opposite tendencies in the rate of oxygen absorption during the period of phosphorylation and substrate respiration. The mitochondrial respiration rate in quartz cells after the first addition of 0.2 ?mol ADP was determined at 6 h. Storage of the drug, the regression coefficient for the linear approximation was ? = 0.004, A = 29.98 with the number of samples n = 94 from various mitochondrial preparations and average speed (V-3/1) = 29.5 ± 0.6. With a second addition of 0.2 ?mol ADP in a quartz cell, ? = 0.002. A = 27.8, n = 86 and average speed (V- 3/2) = 27.5 ± 0.7. For similar indicators in plexiglass cells, the regression coefficients were ? = 0.021, A = 37.12 with n = 256, and average speed (V- 3/1) = 39.9 ± 0.9 and ? = 0.0006. A = 37.1 with n = 244 and average speed (V- 3/2) = 37.2 ± 0.5. With successive registrations of the rate of substrate respiration for 6 h of storage of the preparation of mitochondria when using incubation cells from quartz, the regression coefficient was ? = 0.0043, A = 11.3, n = 148 and average speed (V-0) = 10.01 ± 0.8. Using plexiglass cells ? = 0.00 73, A = 11.1, n = 285, and average speed V-0 (rest) = 12,1 ± 0,3. During the incubation of mitochondria (3.5 mg protein + 5 mmol succinate + 0.2 µmol ADP) in plexiglass cells, the aerobic phase was 8.3 ± 0.2 min, and in quartz cells, 9.8 ± 0.4 min. For dissociated mitochondrial respiration (3.5 mg protein + 5 mmol of succinate + 0.1 ?mol DNF), the values were 6.3 ± 0.4 min, and 8.03 ± 06 min for plexiglass and quartz, respectively.
Table 2 shows mitochondrial metabolism data measured during the first 3 h of storage of the drug. The time interval between comparing samples from a single mitochondrial drug was not more than 15 min. In Table 2, a mandatory condition was uniform daylight during the mitochondrial incubation process. The metabolism indicators in mitochondria incubated in quartz cells, exhibit characteristic features (Table 2.).
-
Linear reduction oxygen consumption rate during incubation; V-4/1 (relaxation after first addition of ADP) ≤ V-0 (rest before the first addition of ADP); V-4/2 (relaxation after second addition of ADP) ≤ V-4/1. Similar values during incubation of mitochondria in plexiglass cells did not change significantly.
-
Reduced response to stimulation supplements of substrates compared to similar values using plexiglass cells.
-
Reduced volume of O2 to phosphorylation at the same rate in plexiglass and quartz cells.
-
Increased aerobic phase.
Table 2
Metabolism indicators of rat liver mitochondria incubated in quartz and plexiglass cells.
|
Substrate and condition
|
Respiration rate in mitochondria ng.atom O2 per min/mg protein
|
% Difference
|
P-value
|
|
Quartz
|
Plexiglass
|
|
Endogenous respiration
|
4.3 ± 0.2 n = 77
|
4.3 ± 0.3 n = 40
|
-
|
-
|
|
Oxidation of succinate 5 mM
(V-4/0)
|
11.4 ± 0.5 n = 100
|
10.3 ± 0.6 n = 38
|
9.6
|
≥ 0. 05
|
|
ADP 0.2 µM
(V-3/1)
|
28.9 ± 1.1 n = 52
|
32.9 ± 0.2 n = 32
|
13.8
|
≥ 0 .01
|
|
relaxation
(V4 / 1)
|
8.4 ± 0.6 n = 51
|
9.8 ± 0.4 n = 32
|
16.7
|
≤ 0.05 *
|
|
ADP-0.2 µM
(V3 / 2)
|
28.3 ± 0.1 n = 48
|
35.8 ± 0.5 n = 29
|
26.5
|
≤ 0.001*
|
|
relaxation
(V4 / 2)
|
6.5 ± 0.3 n = 45
|
8.6 ± 0 6 n = 22
|
32.3
|
≤ 0.01 *
|
|
DNF 0.1 µM (dinitrophenol)
|
31.9 ± 0.5 n = 31
|
51.9 ± 0.8 n = 38
|
62.7
|
≤ 0.05 *
|
|
The phosphorylation rate ofnmolADP/min/mg protein
|
|
ADP 0,2 µM (V3/1)
|
58.4 ± 2.5 n = 54
|
59.9 ± 2.5 n = 47
|
1.5
|
≥ 0.1
|
|
ADP 0.2 µM
(V3/2)
|
52.2 ± 4.0 n = 49
|
52.2 ± 2.4 n = 32
|
-
|
-
|
|
P/O
(V3/1)
|
2.06 ± 0.08 n = 54
|
1.7 ± 0.08 n = 47
|
17.5
|
≤ 0.01 *
|
|
P/O
(V3/2)
|
1.9 ± 0.1 n = 49
|
1.3 ± 0.1 n = 32
|
31
|
≤0.001 *
|
Note:(V-0): rest before first addition of ADP;(V3/1): first addition of ADP; (V3/2): second addition of ADP; (V-4/1): relaxation after first addition of ADP; (V- 4/2): relaxation after second addition of ADP; n: number of experiments; *: P-values ≤ 0.05.
In addition to the correlation of the metabolism of isolated mitochondria on the material of incubation cells, we considered the effect on the metabolic indices of factors such as the level of spontaneous luminescence of the material of the incubation cells (i.e., their photoexcitation level from uniform daylight, determined before is placing mitochondrial suspension). [1]
As shown in Figs. 6,7,8,9, there is a significant correlation between mitochondrial metabolism and the luminescence intensities of empty incubation cells. Thus, during the incubation of mitochondria in plexiglass cells with a low level of luminescence, changes in the metabolism of mitochondria were observed, with a general tendency toward a decrease in the rates of oxygen consumption and phosphorylation. The duration of the aerobic phase was increased to 10.7 min. Variations in mitochondrial metabolism, correlated with the luminescence levels of the incubation quartz and plexiglass cells, were oppositely directed. The duration of the aerobic phase in quartz cells with a low level of luminescence remained unchanged-indicators of mitochondrial metabolism in plexiglass cells with a high level of luminescence corresponded to the control.
Additionally, there was a significant difference in the optical density of the suspension of mitochondria in the anaerobic phase, incubated in energetically different cells of the same material (Figs. 10, 11). The dynamics of the optical density of a suspension of mitochondria incubated in plexiglass cells with a low level of intrinsic luminescence differed significantly during the incubation of mitochondria under the same conditions in the same cell with a higher level of luminescence. The ?T in the anaerobic phase reached 30%. A comparison of curves 1 and 2 in Fig. 10 shows the inconsistency of the rate of mitochondrial "swelling" and respiration rates in cells with low luminescence. Similar to the cases presented in Table 2, the reactions of mitochondria incubated in quartz and plexiglass cells with low intrinsic luminescence are oppositely directed.