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This study was undertaken to investigate the effects of theileriosis on the cardiovascular system in cattle. Blood samples were collected from 50 cattle naturally infected with Theileria spp. (before and after treatment) as well as from 30 non-infected cattle. Hematological parameters and the serum concentrations of total cardiac troponin I (cTnI), aspartate aminotransferase (AST), creatine kinase (CK), and creatine kinase MB (CK-MB) were measured. Also coagulation parameters, plasma levels of activated partial thrombo plastin time (APTT), prothrombin time (PT) and D-dimer were measured. The presence of anemia and the levels of cTnI, CK-MB, CK and AST indicated statistically significant differences between infected and healthy cattle, but no statistically significant differences between the two groups were found in DD levels at the end of the study. Reduction in anemia and reduced levels of cTnI, CK-MB, CK, AST, APTT and PT were also found in post-treatment analyses. The results indicate that anemia, coagulation disorders and hypoxia in theileriosis in cattle can induce myocardial tissue damage.
The contractile protein troponin I (TnI), a constituent protein of the troponin complex located on the thin filaments of striated muscle, is involved in inhibition of calcium-induced myosin ATPase activity (and thus contraction). TnI-slow (slow-twitch skeletal muscle isoform, named TNNI1) and TnI-fast (fast-twitch skeletal muscle isoform, named TNNI2) are muscle-fiber-type-specific proteins, and expression of their genes may affect the composition of muscle fiber, thereby influencing the meat quality traits. Thus, the TnI genes are potential candidate genes for traits related to meat quality in animals. Association of 2 SNPs (EU743939:g.5174T>C in intron 4, and EU743939:g.8350C>A in intron 7) of the TNNI1 gene and a SNP (EU696779:g.1167C>T in intron 3) of the TNNI2 gene with 11 meat quality traits were studied on 334 Large White x Meishan F₂ pigs. In the TNNI1 gene, g.5174T>C and g.8350C>A were found to be significantly associated with intramuscular fat content and meat color value of biceps femoris. The g.5174T>C also showed significant effects on meat color value and marbling score of longissimus dorsi, as well as pH of longissimus dorsi and semispinalis capitis. The g.1167C>T polymorphism in the TNNI2 gene affected significantly the pH of longissimus dorsi, meat color value of longissimus dorsi and semispinalis capitis, marbling score of longissimus dorsi, and intramuscular fat.
Amino acid sequences of chicken (Gallus gallus) meat proteins: myosin, tropomyosin, troponin, collagen and connectin taken from SWISS-PROT and EMBL databases have been analysed using "PROTEIN" computer program searching for fragments identical to bioactive peptides and for bonds susceptible to the action of endopeptidases in protein chains. Chicken meat proteins contain fragments with antihypertensive (connectin), immunomodulating (myosin, tropomyosin, collagen), antithrombotic (collagen), antibacterial (collagen), embryotoxic (collagen) activity and also neuroactive (myosin, collagen, connectin) occurring in amino acid sequences with the frequency higher than that expected from the probability of appearance of given fragments in random amino acid sequences. There is a theoretical possibility of release of bioactive fragments from chicken meat proteins by endopeptidases. Such possibility especially occurs in the case of hydrolysis by proteinase K (EC 3.4.21.14). The frequency of occurrence of bioactive fragments may be applied for quantitative comparison of value of proteins as a source of bioactive peptides, although different affinity of bioactive fragments to their receptors and different susceptibility of proteins to proteolysis should be taken into consideration.
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