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1

Molecular aspects of muscle development

100%
Cieslak D.
Biotechnologia
|
1999
|
issue 1
59-66
EN
An exceptional muscle development in some meat-producing animals is due to the increase in the number of muscle fibers (hyperplasia) or increase in their individual diameter (hypertrophy). The genetic mechanism of the former is well known. It results from mutation in the myostatin gene. The determination of muscular hypertrophy is poorly understood. In pigs this phenomenon is associated with muscular hypermetabolism and contraction induced by stress. Muscle development is controlled by genes called muscular regulatory factors. Four genes belong to this family: myogenin, myf-3, myf-5 and MRF4. While myf-3 and myf-5 are responsible for establishment and maintenance of skeletal myoblasts, myogenin and MRF4 control differentiation of myoblasts into myotubes. Their activity is influenced by other genes and physiological factors. Understanding of the mechanisms involved in myogenesis would provide a useful tool for controlling meat production in farm animals.
2

The conditionings and consequences of cardiac alternations in patients with end-stage renel disease on maintenance hemodialysis

63%
Zabicka H.
Postępy Higieny i Medycyny Doświadczalnej
|
1996
|
vol. 50
|
issue 3
277-291
EN
The arterial hypertension, hyperlipidemia, fluid overload, electrolytic disorders, the presence of arteriovenous fistula and secundary hyperparathyroidism are the most essential causative factors in cardiac pathology of uremic patients. Apart from that, hemodialysis itself is not an indifferent factor. The cardiac consequences consist in prevalence of hypertrophy or dilatation of the heart including valvular annuli or sheer myocardial calcifications and even the aquired heart diseases. Their coexistence with ischaemic heart disease, systolic and especially diastolic dysfunction of the left ventricle may jeopardise life.
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