Uji Efek Imunumodulator Vco (Virgin Coconut Oil) Pada Tikus Jantan

(Article History: Received August 25, 2021; Revised Sept 17, 2021; Accepted Sept 20, 2021) ABSTRAKVirgin coconut oil merupakan minyak kelapa murni.VCO mengandung Medium Chain Fatty Acid (MCFA) yang memiliki pengaruh dalam meningkatkan sistem imunitas. Penelitian ini bertujuan untuk menguji efek imunomodulator VCO terhadap aktivitas fagositosis dan nilai titer antibodi pada tikus jantan. Kelompok uji bersihan karbon dibagi menjadi 5 kelompok dengan masing-masing terdiri dari 5 tikus yaitu kelompok suspensi CMC Na 0,5%, Imboost dosis 30 mg/kgBB, virgin coconut oil 5 ml/KgBB, 10 ml/KgBB,15 ml/KgBB. Perlakuan diberikan sehari sekali selama tujuh hari dan hari ke delapan dilakukan uji imunomodulator dengan metode bersihan karbon. Kelompok perlakuan uji titer antibodi sama seperti di atas selain kontrol positif menggunakan levamisole dosis 25 mg/kgBB diberikan secara oral selama 14 hari. Hasil penelitian menunjukkan bahwa VCO 5 ml/KgBB, 10 ml/KgBB, 15 ml/KgBB meningkatkan aktivitas fagositosis sel makrofag dibandingkan dengan Na-CMC 0,5% (P<0,05) dan berpengaruh secara signifikan meningkatkan pembentukan antibodi sel imun tikus jantan.Kata Kunci: Virgin coconut oil; imunomodulator; fagositosis; titer antibodi ABSTRACTVirgin coconut oil (VCO) is pure coconut oil. VCO contains Medium Chain Fatty Acid (MCFA) which has an influence increased immune system. This study was to determine the immunomodulatory effect of VCO on phagocytic activity and antibody titer values in male rats.The carbon clearance test group was divided into 5 groups with 5 rats each of 0.5% CMC Na suspension, Imboost dose of 30 mg/kgBW, Virgin coconut oil 5 ml/KgBW, 10 ml/KgBW, 15 ml/KgBW. The treatment was given once a day for seven days, on the eight day immunomodulatory test was performed use carbon clearance method. The antibody titer test treatment group was same, except for the positive control, levamisole at a dose of 25 mg/kgBW orally for 14 days. The results showed that VCO 5 ml/KgBB, 10 ml/KgBB, 15 ml/KgBB significantly increased macrophage cell phagocytic activity compared to 0.5% Na-CMC (P<0.05) and could increase cell antibody formation immunity of male mice significantly.Keywords: Virgin coconut oil; immunomodulator; phagocytosis; antibody titer

Butyryl/Caproyl-CoA:Acetate CoA-Transferase: Cloning, Expression and Characterization of the Key Enzyme Involved in Medium-Chain Fatty Acid Biosynthesis

Coenzyme A transferases (CoATs) are important enzymes involved in carbon chain elongation, contributing to medium-chain fatty acid (MCFA) biosynthesis. For example, butyryl-CoA:acetate CoA transferase (BCoAT) is responsible for the final step of butyrate synthesis from butyryl-CoA. However, little is known about caproyl-CoA:acetate CoA-transferase (CCoAT), which is responsible for the final step of caproate synthesis from caproyl-CoA. In this study, two CoAT genes from Ruminococcaceae bacterium CPB6 and Clostridium tyrobutyricum BEY8 were identified by gene cloning and expression analysis. Enzyme assays and kinetic studies were carried out using butyryl-CoA or caproyl-CoA as the substrate. CPB6-CoAT can catalyze the conversion of both butyryl-CoA to butyrate and caproyl-CoA to caproate, but its catalytic efficiency with caproyl-CoA as the substrate was 3.8 times higher than that with butyryl-CoA. In contrast, BEY8-CoAT had only BCoAT activity, not CCoAT activity. This demonstrated the existence of a specific CCoAT involved in chain elongation via the reverse β-oxidation pathway. Comparative bioinformatics analysis showed the presence of a highly conserved motif (GGQXDFXXGAXX) in CoATs, which is predicted to be the active center. Single point mutations in the conserved motif of CPB6-CoAT (Asp346 and Ala351) led to marked decreases in the activity for butyryl-CoA and caproyl-CoA, indicating that the conserved motif is the active center of CPB6-CoAT and that Asp346 and Ala351 have a significant impact on the enzymatic activity. This work provides insight into the function of CCoAT in caproic acid biosynthesis and improves understanding of the chain elongation pathway for MCFA production.