CHANGES IN THE PROPORTION OF A- AND B-TYPES OF GRANULES CONTAINING
ATRIAL AND BRAIN NATRIURETIC PEPTIDES IN ATRIAL MYOCYTES
IN VASORENAL HYPERTENSION IN RATS
M. V. Rakhcheeva, M. L. Bugrova
Nizhny Novgorod State Medical Academy;
e-mail: maryrax@mail.ru
The system of cardiac natriuretic peptides (NP) is a very important factor opposing the effects of the rennin–
angiotensin–aldosterone system (RAAS), sympathoadrenal system and vasopressin to reduce blood pressure.
In the present study, we analyzed the release of atrial and brain natriuretic peptides in the myocytes of the
right atrium in rats by the quantitative morphometric method using double immunocytochemical labeling of atrial
granules comprising NP in vasorenal hypertension induced by the renal artery ligation. The decrease in the total
amount of secretory granules in atrium myocytes by 18 % was detected on the 30th day after the operation.
The number of the A-type granules was reduced by 53 %, and the number of B-type granules was increased by
64 % in comparison with the intact animals. Our data indicate activation of NP secretion in vasorenal hypertension.
The results suggest that high arterial pressure might be explained by reduced expression of NP receptors in
this pathology.
Key words: atrial and brain natriuretic peptides (ANP, BNP), vasorenal hypertension
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