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Method for evaluating the severity of tuberculosis infection

IPC classes for russian patent Method for evaluating the severity of tuberculosis infection (RU 2305286):
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FIELD: medicine, phthisiology.

SUBSTANCE: in the experiment upon guinea pigs in blood plasma one should detect the concentration of taurine and glutamic acid and at taurine concentration being below 68 mcM/l and glutamic acid being below 76 mcM/l it is necessary to evaluate the state as severe, at taurine concentration ranged 68-89 mcM/l and that of glutamic acid ranged 125-227 mcM/l - as average severity degree, and at taurine and glutamic acid concentrations being above 89 and 227 mcM/l, correspondingly - as light severity degree. Application of the present method enables to increase information value and significance of the method in question and, also, detect body reactivity according to the state of its different systems.

EFFECT: higher accuracy of evaluation.

3 ex, 2 tbl

 

The invention relates to medicine, in particular tuberculosis, and uses biochemical blood analysis to determine the number of amino acids.

The severity of tuberculosis depends on the activity of the process and the reactivity of the organism and is determined by the degree of inflammatory reaction, intoxication syndrome and prevalence of the process.

Known methods for determining the activity of tuberculosis on biochemical parameters of blood (for example, the patents of the Russian Federation 2187818, 2238564, 2161313). But the determination of the activity does not give the overall picture of the severity of TB, as it does not take into account the condition of the reactivity of the organism.

There is a method of assessing the severity of tuberculosis, including the determination of biochemical parameters of blood (Hahamisha. The problem of tuberculosis, 2001, No. 7. - Pp.62-64). In the work determine C-reactive protein, haptoglobin, α1- antitripsin, fibrinogen and fibronectin, platelet activating factor, and the values of HCT-test that the parameters associated with the AOA, GENDER, immunological indexes and the number of ceruloplasmin. These parameters estimate the reactivity of the organism. It is well known that the indicators used in experiment and clinic as a non-specific characteristic of the systemic inflammatory response. Despite the high information content of the indicators, this method does not account for the activity of tuberculosis and matched with the public, unable to reliably estimate its severity. Furthermore, the method requires a large number of laboratory tests, which can be obtained only in the modern equipped laboratories and trained personnel to interpret the data received.

Closest to the claimed is a method of assessing the severity of tuberculosis, including the determination of biochemical parameters of blood (As the USSR 1287010, 1987 - prototype). In this way as biochemical indicators determine the content of glucose-6-phosphatedehydrogenase (G-FDG). The level diagnose the severity of the disease. The content of G-FDG determined by any known method. The method is easy to use, reflects the activity of tuberculosis and the body's response to it, but not fully due to the low specificity D-FDG in relation to TB infection and low information content of the enzyme that is unable to assess the status of various systems of the body. Change the content of G-FDG in the blood is almost inflammation of any etiology and depends on the degree of intoxication syndrome. Moreover occurs inherited deficiency of this enzyme. Therefore, the level of G-FDG may not always characterize the severity of tuberculosis (Washeleski, Bgusau. The pathophysiology. - M.: VECHE, 2001. - S-569)that creatures of the NGO reduces the reliability of the method. In addition, determination of G-FDG can only be performed immediately after blood sampling, as it is well known that all the enzymes are destroyed during storage, including by freezing.

The objective of the invention is a comprehensive assessment of the severity of tuberculosis.

The technical result is an increase in the information content and reliability of the method; determination of reactivity on the status of various systems.

This technical result is achieved in that in the method of assessing the severity of tuberculosis, including the determination of biochemical parameters of blood, the authors propose to determine in experiments on Guinea pigs in plasma concentrations of taurine and glutamic acid, and at concentrations of taurine less than 68 µmol/l and glutamic acid less than 76 µmol/l can appreciate how difficult, at concentrations of taurine in the interval 68-89 µmol/l and glutamic acid in the interval 125-227 µmol/l as moderate, and at concentrations of taurine and glutamic acid, exceeding 89 227 μmol/l, respectively, - as mild severity.

Conducted by the author studies of amino acids in blood plasma of Guinea pigs showed that the most informative for assessing the severity of experimental tuberculosis are taurine and glutamic acid, as they are associated with the greatest number of PA is amerov, determining the reactivity of the organism and the activity of tuberculosis. Correlation analysis the authors found that in Guinea pigs concentrations of taurine and glutamic acid in plasma correlated with the various systems of the body, such as the AOA-FLOOR, immune, hematopoietic. Found that concentrations of taurine are associated with indices forming reactivity of the organism (AAO, GENDER, number of ceruloplasmin, NBT-test). The concentration of glutamic acid in plasma correlated with the same parameters, as well as with indicators myelogram, morphometrics and immunological indexes, which indicates its connection with the reactivity of the organism and the activity of tuberculous process. In addition, the experiment on Guinea pigs showed that tuberculosis taurine and glutamic acid in blood plasma are interconnected. Thus, the authors have shown that concentrations of taurine and glutamic acid in blood plasma in experimental tuberculosis reflect the state of reactivity of the organism and the activity of tuberculosis, resulting in their definition can be used to assess the severity of tuberculosis, while the information content and reliability of this assessment increase.

It is known that changes in the concentration of amino acids, particularly glutamic acid specific for tuberculosis (M. Grigoryan. Soda is the content of free amino acids in serum, their deamination and synthesis of chemotherapy of tuberculosis. M, 1963. 16; Model L.M. Essays clinical pathophysiology of tuberculosis. - M.: Medgiz, 1962. - 323 C.). It is also known that taurine is one of the components determining the specific resistance tuberculosis (Pavlov V.A. ABOUT the biochemical mechanisms of different susceptibility to mycobacteria Guinea pigs // Probl. TB. 1998. No. 2. - P.30-32). Therefore, the use of glutamic acid and taurine as criteria for assessing the severity of tuberculosis increases the specificity of the method and, therefore, further increases the accuracy of determining the severity of tuberculosis in comparison with the prototype.

It is known that tuberculosis is accompanied by a change in the number of amino acids in blood plasma (Iahaio. The content of free amino acids in serum of patients with pulmonary tuberculosis / Soviet medicine, 1972, No. 4, S-15; Biscevic, Eshooting. The content of free amino acids in serum of lung tuberculosis / Soviet medicine, 1973, No. 11, P.146-147), but there is no work showing the relation between the severity of TB from changes in the concentration of amino acids.

The parameters that determine the severity of tuberculosis were identified by the authors on the model of experimental tuberculosis in Guinea pigs using a laboratory strain of H37Rv in doses of 0.01 mcgi of 0.001 µg. In the experiment used the following groups of animals (28 in each group): intact healthy animals of the control and infected with a laboratory strain of H37Rv at a dose of 0.01 μg, who does not receive treatment comparison No. 1 - infected laboratory strain of H37Rv at a dose of 0.01 μg receiving treatment with isoniazid at a dose of 5 mg/kg of body weight, comparison No. 2 - infected laboratory strain of H37Rv at a dose of 0.001 μg receiving treatment with isoniazid at a dose of 5 mg/kg of body weight. The experiment was continued for two months, after which the animals were killed and the study of tissues and blood samples. The burden of TB is determined by the dynamics of changes in body weight, the weights of the internal organs, according to crop the office of lung homogenates according to the methodical recommendations (guidelines for the study of anti-TB activity of pharmacological substances. The authors Guskov T.A., Golaszewska VI, Shulgin M.V., Martynov, L.P., Malkina G.N., Sokolova G.B. IN the Manual on experimental (preclinical) study of new pharmacological substances. - M.: Medicine, 2000. - Page 287-292; Methods of experimental chemotherapy: a Practical guide /edited by GI Pershin. - M.: Medicine, 1971. - P. 166-185).

According to the survey the condition of the animals of the control group was regarded as severe, the group compared the possible No. 1 - as of moderate severity, the comparison group No. 2 - as mild severity. Average normal values of the investigated parameters obtained in intact animals group. In addition, conducted a histological examination of the internal organs, morphometry of the lung tissue, the study HALF of the AOA (total antioxidant activity, the amount of malondialdehyde), ceruloplasmin, myelogram, immunological indexes, NBT-test. Chromatographic method defined concentration of the entire spectrum of amino acids in plasma.

The study has found that the spectrum of amino acids, the highest correlation coefficients with the studied parameters (more than 0.5) are taurine and glutamic acid (table 1).

The results show that concentrations of taurine and glutamic acid in blood plasma shape reactivity of Guinea pigs with tuberculosis.

In addition, the correlation coefficient between the concentration of glutamic acid and the prevalence of caseous necrotic changes in the lung tissue according to the morphometry was 0.7, and between the concentration of taurine to 0.6. The correlation coefficients between the number of intact lung tissue and the concentrations of glutamic acid and taurine was of 0.51 and 0.7, respectively. This is traget the relationship of concentrations of taurine and glutamic acid with active tuberculosis.

Table 1
The correlation coefficients of the investigated parameters with amino acids
Amino acids Analyzed parameters:
The AOA MDA Torulopsis min Macrophage Rostock blood Erythrocyte Rostock blood Txlymphocytes Nst-test
Taurine 0,6 -0,5 0,93 -0,85 0,58 0,7 0,84
Glutamic acid 0,7 -0,81 0,7 0,6 0,89 0,56 0,75

Thus, the concentration of taurine and glutamic acid correlated with the parameters of reactivity of Guinea pigs and activity of TB and therefore, in comparison with the prototype, most fully reflect the severity of tuberculosis and can be used as criteria for assessing the severity of experimental tuberculosis.

In addition, the experiment established that the concentrations of taurine and glutamic acid in plasma there is also a correlation, which amounted to 0.75. Therefore, delapouite the reliability of determination of the severity of experimental tuberculosis advisable joint determination of the concentrations of these amino acids.

In the experiment determined the concentrations of taurine and glutamic acid, corresponding to different degrees of severity of tuberculosis. The obtained data are presented in table 2.

Table 2
The dependence of the severity of the TB concentration of taurine and glutamic acid in plasma
The group of animals Taurine, umol/l Glutamic acid, µmol/l
Control (hard state) 65,3 (63,0-67,6) 63,0 (60,4-75,6)
Comparison No. 1 (medium severity) 83,1 (with 77.7 88.5 in) 175,9 (125,0-226,8)
Comparison No. 2 (mild severity) 144,5 (136,3-152,8) 315,0 (288,9-341,1)
Intact (normal) 201,2 (159,3-243,1) 400,0 (373,9-426,1)

The experimental data showed that different concentrations of taurine and glutamic acid correspond to different degrees of severity of tuberculosis. At concentrations of taurine less than 68 µmol/l and glutamic acid less than 76 µmol/l condition is assessed as severe, at concentrations of taurine in the interval 68-89 µmol/l and glutamic acid in the interval 125-227 µmol/l as moderate, and at concentrations of taurine and glutamic what th acid, more than 89 and 227 μmol/l, respectively, as mild severity.

The obtained results statistically differ with p<0,05.

Thus, the severity of tuberculosis in experimental animals can be judged by the concentrations of taurine and glutamic acid in plasma.

The method is as follows. After the blood is prepared samples for analysis of amino acids (Abstract journal, Biochemistry, 1986. No. 25, abstract 4114). In the prepared samples on the chromatograph to determine the concentration of taurine and glutamic acid. The obtained values are compared with the established intervals and make a conclusion about the severity of experimental tuberculosis.

Example 1. In the experiment in Guinea pigs infected with Mycobacterium tuberculosis H37Rv at a dose of 0.01 μg and not treated (control group), the analysis of the blood showed concentrations of taurine and glutamic acid 63,8 and 70,1 µmol/l, respectively. Comparing these values with the established borders of the intervals severity of tuberculosis (68 µmol/l taurine and less than 76 µmol/l glutamic acid), conclude severe disease in this animal.

Example 2. In the experiment in Guinea pigs infected with Mycobacterium tuberculosis and treatment with isoniazid (group against the ment No. 1), the analysis of the blood showed concentrations of taurine and glutamic acid 79,1 and 180,2 µmol/l, respectively. Comparing these values with the established borders of the intervals severity of TB, the process is regarded as moderate.

Example 3. In the experiment in Guinea pigs infected with Mycobacterium tuberculosis and treatment with isoniazid (comparison group No. 2), the analysis of the blood showed concentrations of taurine and glutamic acid of 148.4 and to 300.2 µmol/l, respectively. Comparing these values with the established borders of the intervals severity of TB, the process is regarded as mild severity.

The method of assessing the severity of tuberculosis, including the determination of biochemical parameters of blood, characterized in that in the experiment on Guinea pigs in the blood plasma to determine the concentration of taurine and glutamic acid at concentrations of taurine less than 68 µmol/l and glutamic acid less than 76 µmol/l condition is assessed as severe, at concentrations of taurine in the interval 68-89 µmol/l and glutamic acid in the interval 125-227 µmol/l as moderate, and at concentrations of taurine and glutamic acid, exceeding 89 227 μmol/l, respectively - as mild severity.

 

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