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Dysfunkcja przedniej części przysadki u koni a choroba Parkinsona
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Wyszukaj w serwisie


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Dysfunkcja przedniej części przysadki u koni a choroba Parkinsona u ludzi – próba stworzenia zwierzęcego modelu α-synukleinopatii


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Dysfunkcja części pośredniej przysadki u koni

Dysfunkcja części pośredniej przysadki u koni (ang. PPID – pars pituitary intermedia dysfunction) została po raz pierwszy opisana w niemieckiej literaturze weterynaryjnej w 1932 roku (15). PPID jest spontanicznie występującą, klinicznie postępującą chorobą neuroendokrynną dotykającą 20-25% koni w wieku powyżej 15 lat (16). Zespół Cushinga, definiowany jako hiperadrenokortycyzm wynikający z nadmiernego wydzielania przysadkowego adrenokortykotropiny (ACTH), występuje spontanicznie i dość często u psów i koni, rzadko u kotów, a także u gryzoni takich jak szczury i myszy (17, 18).

Fizjologia

Przysadka mózgowa konia jest zlokalizowana w zagłębieniu kości klinowej czaszki zwanym siodłem tureckim, nieco poniżej podwzgórza, z którym łączy się za pomocą lejka (1). Dzieli się na części: przednią – gruczołową, środkową oraz część tylną – nerwową, które różnią się od siebie zarówno funkcją, jak i budową (2).

Płat pośredni (PI), zbudowany z komórek melanotropowych, jest bardzo dobrze rozwinięty u konia, gorzej u psów, kotów i przeżuwaczy (4). Chociaż wyraźny u ludzkiego płodu, nie jest dobrze zdefiniowany u osób dorosłych, zamiast tego melanotropy są rozproszone w całym płacie gruczołowym (5).

W odpowiedzi na fizjologiczne, patologiczne lub środowiskowe czynniki dochodzi do aktywacji osi podwzgórze – przysadka – nadnercza. Wówczas neurony dopaminergiczne podwzgórza syntetyzują hormon uwalniający kortykotropinę (CRH), co prowadzi do wydzielania ACTH, która działa na komórki warstwy pasmowatej nadnerczy, [...]

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Mogą zainteresować Cię również


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Wizytówka firmy


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Sklep


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