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Abstrak :
PCSK9 (Proprotein Convertase Subtilisin/Kexin Type 9) merupakan regulator Low-Density Lipoprotein (LDL) melalui perannya dalam degradasi Low-Density Lipoprotein Receptor (LDLR) sehingga PCSK9 dapat dijadikan target terapi yang menjanjikan sebagai agen penurun lipid. Inhibitor PCSK9 yang tersedia memiliki beberapa kekurangan. Untuk itu, banyak peneliti mengembangkan obat inhibitor PCSK9 lainnya. Dalam pengembangan obat, model hewan PCSK9 yang sejalan pada manusia dibutuhkan dan dikembangkan melalui induksi suatu nutrisi, misalnya fruktosa. Penelitian efek diet tinggi fruktosa terhadap kadar PCSK9 plasma dan ekspresi PCSK9 otak masih sangat terbatas dan perlu diteliti lebih lanjut. Pada penelitian ini, tikus diberikan diet tinggi fruktosa dengan variasi durasi, yaitu 3 minggu, 4 minggu, dan 5 minggu untuk melihat efeknya terhadap kadar PCSK9 dan ekspresi PCSK9. Pengukuran kadar PCSK9 plasma dan otak dilakukan menggunakan metode ELISA dan ekspresi PCSK9 otak dianalisis menggunakan metode western blot. Hasil menunjukkan bahwa terjadi perubahan kadar PCSK9 pada plasma dan otak tikus dibandingkan kelompok normal. Kadar PCSK9 plasma menunjukkan peningkatan signifikan (p<0,05) pada kelompok 3 minggu dan 4 minggu dibandingkan kelompok kontrol dan kadar PCSK9 plasma tertinggi teramati pada durasi induksi 4 minggu. Kadar PCSK9 otak menunjukkan penurunan signifikan (p<0,05) pada kelompok 3 minggu dan 4 minggu dibandingkan kelompok kontrol. Ekspresi PCSK9 pada otak menunjukkan pola penurunan dibandingkan dengan kelompok kontrol. Berdasarkan hasil, dapat disimpulkan bahwa model hewan PCSK9 pada tikus berpotensi digunakan sebagai model hewan PCSK9. ......PCSK9 (Proprotein Convertase Subtilisin/Kexin Type 9) is a Low-Density Lipoprotein (LDL) regulator through its role in Low-Density Lipoprotein Receptor (LDLR) degradation, making PCSK9 a promising therapeutic target as a lipid-lowering agent. The currently available PCSK9 inhibitors have drawbacks. As a result, many researchers have developed PCSK9 other inhibitor drugs. PCSK9 animal model is required in drug development and develops through the induction of a nutrient, such as fructose. Research on the effect of a high-fructose diet on circulating PCSK9 levels and brain PCSK9 expression is still limited dan further research is needed. Thus, in this study, rats were fed a high-fructose diet for 3 weeks, 4 weeks, and 5 weeks to see how it affected PCSK9 levels and expression. The ELISA method was used to measure plasma and brain PCSK9 levels and the western blot method was used to analyze brain PCSK9 expression. The results showed plasma PCSK9 levels increased significantly (p<0,05) in the 3-week and 4-week groups compared to the control group, with the 4-week induction duration producing the highest plasma PCSK9 levels. Brain PCSK9 levels decreased significantly (p<0,05) in the 3-week and 4-week groups when compared to the control group. PCSK9 expression in the brain also decreased when compared to the control group. Based on the findings, the PCSK9 animal model in rats has the potential to be used as a PCSK9 animal model.

Abstrak :
PCSK9 berperan dalam regulasi homeostasis kolestrol dimana meningkatkan kadar LDL-C dengan mendegradasi reseptor LDL (LDL-R). Penelitian mengenai obat inhibitor PCSK9 masih dikembangkan namun metode uji in vivo yang memfasilitasi PCSK9 sangat terbatas terlebih di Indonesia. Maka dilakukan pembuatan model hewan tinggi PCSK9 menggunakan tikus tipe wild yang diinduksi diet tinggi fruktosa mengikuti penelitian yang telah dilakukan pada hamster dan mencit. Penelitian ini dilakukan pada tikus wistar jantan dengan menginduksi diet tinggi fruktosa (HFD) sebanyak 3mL/200grBB selama 3, 4, dan 5 minggu. Plasma dan jaringan ginjal diambil setiap durasi 3, 4 dan 5 minggu dan kadar PCSK9 diukur menggunakan uji ELISA. Sementara ekspresi PCSK9 ginjal dianalisis menggunakan metode western blot. Tikus kelompok HFD menunjukkan kadar PCSK9 plasma yang meningkat signifikan (p<0,05) terhadap kelompok kontrol durasi 3 dan 4 minggu. Durasi optimal peningkatan kadar PCSK9 plasma pada tikus adalah 4 minggu yang menghasilkan kadar PCSK9 sebesar 1389,02 ng/mL. Sementara kadar PCSK9 ginjal menurun signifikan (p<0,05) terhadap kelompok kontrol durasi 3 dan 4 minggu. Ekspresi mature PCSK9 ginjal kelompok HFD lebih tinggi dibandingkan kelompok kontrol. ......PCSK9 plays a role in the regulation of cholesterol homeostasis which increases LDL-C levels by degrading LDL receptors (LDL-R). Research on PCSK9 inhibitor drugs is still being developed but in vivo test methods that facilitate PCSK9 are limited, especially in Indonesia. Therefore, an animal model for high PCSK9 was created using wild-type rats induced by a high-fructose diet following research that had been conducted on hamsters and mice. This research was conducted on male Wistar rats by inducing a high fructose diet (HFD) of 3mL/200grBW for 3, 4, and 5 weeks. Plasma and kidney tissue were collected every 3, 4 and 5 weeks and PCSK9 levels were measured using the ELISA test. While kidney PCSK9 expression was analyzed using western blot method. The HFD group rats showed significantly increased plasma PCSK9 levels (p<0.05) compared to the control group for 3 and 4 weeks duration. The optimal duration of increasing plasma PCSK9 levels in rats is 4 weeks which results in PCSK9 levels of 1389.02 ng/mL. Meanwhile, kidney PCSK9 levels decreased significantly (p<0.05) compared to the control group for 3 and 4 weeks duration. The expression of kidney mature PCSK9 in the HFD group was higher than the control group.