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Status of Liver Enzymes as an Indicator of Local Treatment of Burn Trauma in Experiment
UDC 616.001.6–001.17–08:577.151.4
Received 21.06.2012
A.G. Solovyeva, PhD, Research Worker, the Experimental Medicine Division;
Y.V. Zimin ;
S.P. Peretyagin, D.Med.Sc., the Head of the Experimental Medicine Division;
N.V. Didenko, Clinical Research Assistant, the Experimental Medicine Division;
А.K. Martusevich, PhD, Senior Research Worker, the Experimental Medicine Division;
К.D. Larionova, Junior Research Worker, the Children Burn Unit
Nizhny Novgorod Research Institute of Traumatology and Orthopedics, Ministry of Health of the Russian Federation,
Verkhne-Volzhskaya naberezhnaya St., 18, Nizhny Novgorod, Russian Federation, 603155
The energy and protein failure reducing adaptable compensation and regeneration potential of the body is an essential component in the
pathogenesis of a burn disease.
The aim of the investigation was to study the activity of liver oxidoreductases of rats with heat injury in various options of local treatment.
Materials and Methods. The researches were carried out on 60 white rats of Wistar line. The activity of enzymes was determined in liver
homogenates on day 3, 7 and 10 after the heat injury and local treatment of burn wounds.
Results. There was revealed the increase in lactate dehydrogenase activity in retroaction and significant decrease of the activity of
detoxication enzymes in the liver of rats on 3, 7 and 10 days after a thermal trauma. The rate and extent of oxidoreductases restoration activity
were found to determine the local burn treatment modality.
Key words: thermal trauma; oxidoreductases; liver enzymes; burn treatment
Protein-energy malnutrition decreasing adaptive compensatory and regenerative potential of the organism is an important component of the burn disease pathogenesis [1]. At the same time the characteristics of malfunction of oxidoreductases in thermal trauma and also the possibilities of complete restoration of their activity in applying local and systemic treatment are still underinvestigated. From this point of view the assessment of changing of these characteristics in the use of different variants of local treatment of a burn wound allows to substantiate the rationality of choosing of medicine for accomplishing the combustiology tasks [2]
The aim of the investigation was to study the activity of liver oxidoreductases of rats with heat injury in various options of local treatment.
Materials and Methods. The researches were carried out on 60 white rats of Wistar line having the body mass 180-250 g. The animals being under ether anesthesia were burned with boiling water on 20% of body surface (the area had been epilated previously, exposition — 3 s). There were formed 4 main groups with 10 animals in every group: the rats of the group 1 were treated with “Levomecol” (Open Joint Stock Company “Nizhpharm”, Russia, standard therapy), group 2 — gel composition with “Tizol” (OLYMP, Russia) + ozonized oil “O'THREE-SUPEROZONIDE” (Medozons, Russia), group 3 — with “Tizol” + chlorhexidinum (1:200), group 4 — “Tizol” + “Levoxym” (ximedon composite — 8%,
For contacts: Solovyeva Anna Gennadievna, phone: 8(831)436-25-31, +7 904-903-37-49; e-mail: [email protected]
20 СТМ J 2013 — 5(2) A.G. Solovyeva, Y.V. Ziminl , S.P. Peretyagin, N.V. Didenko, A.K. Martusevich, K.D. Larionova
BIOMEDICAL INVESTIGATIONS
200
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0
Day 3
Day 7
Day 10
140
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I 80
x
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40 20 0
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Day 7
□ — intact rats; □
n—“Levomecol”; □
□ — “Tizol” + chlorhexidinum; □
Day 10
burn;
“Tizol” + ozonized oil; ■ “Tizol” + “Levoxym”
Fig. 1. Activity of rats' liver lactate dehydrogenase (nmole NADH/min) in the back (a) and direct reaction (b) in different variants of the local treatment of burn. * — difference is statistically significant in comparison with the intact animals (p^0.05); + — in comparison with the burned animals (p^0.05)
*
+
+
animals (Fig. 1). Herewith the activity of this enzyme in the direct reaction in burn is nearly unchangeable.
It contributes lactate accumulation the latter being in high concentrations can serve as an indirect marker of the development of tissue hypoxia and acidosis [5, 6].
The increasing of LDHback activity on day 3 after the trauma within the period of acute burn toxemia can be associated with the development of hypermetabolic syndrome including activation of the lipid peroxidation process and increasing of the level of molecules having an average molecule mass [5].
It was found a great decreasing of detoxication enzyme activity in the liver (AlDH and ADH; Fig. 2, 3) in scalding of the animals on every observation date, leading to the accumulation of high toxic aldehydes and ketones and also ethanol, its intermediate metabolic product is acetaldehyde. The latter, in turn, inhibites the activity of mane enzymes, destroy the structure and function of plasma membranes, activate lipid peroxidation process [3].
In the study of enzyme activity during the process of burn wound treatment it was found that applying compositions on the basis of “Tizol” doesn’t influence greatly to the LDHdirect activity (Fig. 1, b). Meanwhile the animal treatment with “Levomecol” contributes decreasing LDHback activity on day 3 after affection and leads to the significant decreasing of this enzyme activity on day 7 (for 24% in comparison with thermal trauma, p<0.05), approaching the results of the control group of animals. The LDHback activity decreasing under the influence of “Levomecol” can be explained by nonselective inhibitor activity of the antibiotic (“Levomycetin”) being contained in it to the enzyme activity in back reaction [7]. However, further dynamics of LDH activity failed to backtrace due to the death of all animals by 10 day of the observation.
LDHback activity after the trauma in applying the composition “Tizol” + chlorhexidinum in comparison with non-treated animals decreases greatly too on 7 and 10 days (for 10 and 54% respectively, p<0.05). We can suggest that the mechanism of chlorhexidinum activity is double in this case — blocking of ione channel allosteric modulation of the active enzyme centre [8, 9].
The most strongly marked decreasing of LDHback activity in the liver in thermal trauma is observed while using the composition “Tizol” + “Levoxym”: on day 3 after the trauma the enzyme activity is decreased up to 62%; on day 7 — up to 38% and day 10 — up to 51% in comparison with similar in the burned rats without ant treatment, and these indexes are greatly less than the indexes of the intact animals on 3 and 10 days after the burn (p<0.05; Fig. 1, a).
On the one hand, such marked positive influence of this composition to LDHback activity can be specified by the properties of the components containing in “Levoxym”: Levomycetin and succinic acid. Taking into account that succinic acid activity underlies the reparative effect of “Levoxym”, the activity mechanism of this medicine was considered from the point of its molecular and cellular effects. We think the effect of succinic acid activity
contained in “Levoxym” is mediated by the respiratory chain and normalization of energetic metabolism and implemented by its property to inhibit lipid peroxidation of cellular membranes. Succinic acid produce modulating effect to membrane associated antioxidant enzymes [10]. On the other hand, it is necessary to take into account the impact of the gel “Tizol” providing bioavailability growth of “Levoxym” components.
Composition “Tizol” + ozonized oil contributes statistically significant decreasing of LDHback activityon on day 3 after the trauma for 25% in comparison with the rats which burns were not treated.
It has been found that all applied variants of local treatment contribute the ADHdirect activity restoration having been decreased with thermal trauma, though the degree
Liver Enzymes in Burning Injury СТМ 1 2013 — 5(2) 21
BIOMEDICAL INVESTIGATIONS
25
Day 3 Day 7 Day 10
□ — intact rats;
□ — burn;
n — “Levomecol”;
□ — “Tizol” + ozonized oil;
□ — “Tizol” + chlorhexidinum;
□ — “Tizol” + “Levoxym”
Fig. 2. Activity of rats' liver aldehydedehydrogenase (nmole NADH/min) in different variants of the local treatment of burn. * — difference is statistically significant in comparison with the intact animals (p^0.05); + — in comparison with the burned animals (p^0.05)
25
Day 3
Day 7 a
Day 10
x
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<
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H
Day 3
Day 7 b
Day 10
□ — intact rats; □ — burn;
D — “Levomecol”; □ — “Tizol” + ozonized oil;
□ — “Tizol” + chlorhexidinum; □ — “Tizol” + “Levoxym”
+
+
Fig. 3. Activity of rats' liver alcohol dehydrogenase (nmole NADWmin) in the direct (a) and back (b) reaction in different variants of the local treatment of burn. * — difference is statistically significant in comparison with the intact animals (p^0.05); + — in comparison with the burned animals (p^0.05)
22 СТМ J 2013 — 5(2) A.G. Solovyeva, |Y.V. Ziminl , S.P. Peretyagin, N.V. Didenko, A.K. Martusevich, K.D. Larionova
BIOMEDICAL INVESTIGATIONS
of normalization of enzyme functioning depends on used medicines (Fig. 3, a). At that the activity index within the whole period of observation is higher than the physiological level when the scheme “Tizol” + ozonized oil is used only. The applied line of drugs following the significance level of the effect to the ADHdirect activity looks the following way: “Tizol” + ozonized oil > “Tizol” + “Levoxym” > “Tizol” + chlorhexidinum > “Levomecol” (Fig. 3, a).
The activity of AlDH and ADH in back reaction increases most effectively in thermal trauma under the influence of the composition “Tizol” + “Levoxym” (Fig. 2 and 3, b), AlDH activity significantly increases on day 3 after the affection by 350%, on day 7 — by 233%, on day 10 — by 137%; ADHback activity statistically significantly increases on day 3 by 293%; on day 7— by 204%, on day 10— by 207% in comparison with non-treated rats (p<0.05). The mechanism of succinate influence, “Levoxym” component to AlDH and ADH activity probably consists in restoration of liver oxidative ability with the consequent eliminating of ethanol and acetaldehyde by means of the stimulation of the Krebs cycle with this metabolite [10].
The AlDH activity increases less effectively under the influence of the composition “Tizol” + chlorhexidinum (on day 3 — by 170%, on day 7 — by 385% in comparison with non-treated rats; p<0.05). The AlDH activity increases significantly under the influence of the composition “Tizol” + ozonized oil on day 3 — by 181%, on day 7 — by 56% in comparison with non-treated rats; p<0.05).
Conclusion. It was found that the manifestation of enzyme activity of energy metabolism (lactate dehydrogenase) and the system of biotransformation (aldehyde dehydrogenase) of the animals liver in burn depends on a chosen variant of local treatment. So, the assessment of catalytic properties of these oxidoreductases can act as a metabolic marker of systemic action of the drugs for local treatment of thermal trauma and additional marker of its efficacy.
References
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Liver Enzymes in Burning Injury
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