Respon Sistem Homeostasis Kalsium Tikus Ovariektomi Yang Mengkonsumsi Kombinasi Calcitriol Dengan Raloxifene

Normal range of calcium (Ca) level in the blood is maintained by Ca homeostasis in the intestinal, kidney and bone. The objective of this research was to study the response of calcium homeostasis system ovariectomized rats consuming combination of calcitriol and raloxifene by calcium balance study. Twenty five female Wistar rats at 8 weeks of age were divided into five groups of five: normal control (NK), ovariectomy control (OVK), ovariectomy+calcitriol (OVD ), ovariectomy+ raloxifene (OVR), and ovariectomy+calcitriol+ 20raloxifene supplementation (OVDR), of five each. Seven weeks after the surgery, each rats was placed into individual metabolic cages for Ca balance studies (Ca consumption, feces and urine Ca excretion, and intestinalCa absorption). In 5 to 8 days of the balance studies, the remaining food, urine, and feces were collected every day for Ca analyses. The results showed that Ca consumption, feces and urine Ca excretion, and intestinal Ca absorption of OVDR rats were higher than OVK rats. Consumption and feces Ca excretion of OVDR rats were higher than OVK rats which informed the decrease of estrogen hormone. Intestinal Ca absorption of OVDR rats was higher than OVK rats which informed the decrease of parathyroid hormone. Meanwhile, urine Ca excretionof OVDR rats was higher than OVK rats which informed the decrease of parathyroid hormone and estrogen. In conclusions, the response of calcium homeostasis system in ovariectomized rats consuming combination ofcalcitriol and raloxifene for 8 weeks was marked by increasing Ca absorption in intestine and Ca excretion in urine

Suplementasi Calcitriol Menurunkan Risiko Osteoporosis Tikus Ovariektomi

Suplemen calcitriol memicu pembentukan tulang, namun juga meningkatkan resorpsi tulang. Penelitian ini dilakukan untuk mengkaji efektivitas calcitriol dalam menurunkan risiko osteoporosis tikus ovariektomi. Lima belas tikus Wistar betina umur delapan minggu, dibagi tiga kelompok (kontrol normal KN, kontrol ovariektomi KOV, dan ovariektomi+ calcitriol OVD ) dan diberi perlakuan selama delapan minggu. Pada akhir perlakuan, 100 dilakukan pengambilan darah melalui pleksus retroorbitalis untuk pemeriksaan estradiol, selanjutnya semua tikus dietanasi menggunakan campuran ketamin10% dengan xylaxine 2%. Femur kiri diambil untuk pemeriksaan histopatologis. Hasil analisis menunjukkan tikus KOV mempunyai konsentrasi estradiol yang secara signifikan lebih rendah dibandingkan tikus KN, dan tikus OVD mempunyai konsentrasi estradiol tidak 100 berbeda signifikan dibanding tikus KOV. Gambaran histopatologis epifisis tulang femur distalis tikus OVD 100terlihat mempunyai lebih sedikit jaringan adiposit dan lebih banyak spikulum trabekula dibanding tikus KOV. Dari hasil penelitian disimpulkan bahwa suplementasi calcitriol 100ng/hari selama delapan minggu pada tikus ovariektomi menurunkan risiko osteoporosis