Advances in Clinical and Experimental Medicine
2008, vol. 17, nr 2, March-April, p. 227–235
Publication type: review article
Language: English
Vascular Calcification in Chronic Kidney Disease
Kalcyfikacja naczyń w przewlekłej chorobie nerek
1 Department of Pediatric Nephrology, Silesian Piasts University of Medicine in Wrocław, Poland
Abstract
The aim of this review is to present current knowledge of vascular calcification in chronic kidney disease. Recent investigations point mainly at the disturbed balance between factors facilitating and protecting extraosseous mineralization as crucial in the creation of calcification of vessels. Chronic kidney disease is associated with multiple abnormalities potentially accelerating calcification, such as hypercalcemia, hyperphosphatemia, dyslipidemia, and inflammation. Their impact triggers the change of vascular smooth muscle cells into osteoblastor chondrocyte−like cells expressing bone−associated proteins. This differentiation induces the production of apoptotic bodies that become nuclei of mineralization. The decreased capacity of calcification inhibitors, such as fetuin−A, osteoprotegerin, and osteopontin, additionally weakens the protection against excessive mineralization. These disturbances are of paramount importance in CKD patients because of the close connection between pathomorphology and clinical outcome. Both medial and intimal calcification affect the cardiovascular system due to the increased vascular stiffness and calcified atherosclerotic lesions, creating a vast clinical panorama of symptoms from stroke to heart failure. Therefore, clarifying the mechanisms responsible for vascular calcification in CKD patients seems to be a key target for effective future prevention.
Streszczenie
Celem pracy jest przedstawienie aktualnego stanu wiedzy na temat kalcyfikacji naczyń w przewlekłej chorobie nerek (p.ch.n.). Badania ostatnich lat wskazują przede wszystkim na rolę zaburzonej równowagi między czynnikami ułatwiającymi pozakostną mineralizację a chroniącymi przed nią, jako kluczowego czynnika w powstawaniu zwapnień naczyniowych. Przewlekłej chorobie nerek towarzyszy wiele nieprawidłowości potencjalnie przyspieszających proces kalcyfikacji, takich jak: hiperkalcemia, hiperfosfatemia, zaburzenia gospodarki lipidowej lub stan zapalny. Ich wpływ powoduje zmianę komórek mięśni gładkich naczyń w komórki osteoblastoi chondrocytopodobne, z ekspresją białek kostnych na ich powierzchni. To różnicowanie komórek prowadzi do tworzenia ciałek apoptotycznych, stających się jądrami krystalizacji. Zaburzona funkcja inhibitorów krystalizacji, do których należą fetuina−A, osteoprotegeryna i osteopontyna, dodatkowo zmniejsza skuteczność ochrony przeciwko nadmiernej mineralizacji. Powyższe zaburzenia odgrywają zasadniczą rolę u pacjentów z p.ch.n., gdzie obraz patomorfologiczny bezpośrednio implikuje stan kliniczny. Zarówno kalcyfikacja błony wewnętrznej, jak i środkowej naczynia uszkadza układ krążenia, zwiększając sztywność naczyń i wywołując tworzenie zwapnień w obrębie blaszek miażdżycowych, co powoduje występowanie różnych objawów klinicznych – od udaru do niewydolności serca. Wyjaśnienie mechanizmów odpowiedzialnych za kalcyfikację naczyń u pacjentów z p.ch.n. ma więc zasadnicze znaczenie w skutecznym zapobieganiu w przyszłości.
Key words
calcium/phosphate metabolism, vascular smooth muscle cells, fetuin−A, osteopontin, osteoprotegerin
Słowa kluczowe
gospodarka wapniowo−fosforanowa, komórki mięśni gładkich naczyń, fetuina A, osteopontyna, osteoprotegeryna
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