The promotion of fatty acid metabolism, to which PPARα contributes, has been suggested that it would be participate to maintain the proximal tubular cell function in kidney. The loading on the proximal tubular cell of fatty acids could arise the inflammation and cell death in obesity. One of the “Kampo” medicines, Boiogito (BO) is used for the remedy of overweight women exhibiting chronic fatigues as well as edema in the lower extremities or knees. BO would exhibit the prevention of the proximal tubular cell damage and improvement of kidney function by reducing the portion of fatty acids. In this study, BO was orally administered high fatty acid combined with bovine serum albumin for mice to evaluate the mRNA expression of PPARα quantified by PCR. The increase of PPARα mRNA expression was observed BO administration, followed by reduce the volume of fatty acids in kidney.KEY WORDS: Boiogito, Fatty acid metabolism, PPARα, Proximal Tubular CellINTRODUCTIONObesity is a risk factor for incidence of albuminuria and chronic kidney disease 1, 2, and an accumulating visceral fat would be involved in the regulation of primary stage of nephropathy 3, microalbuminuria. Fatty acids are major contributor to these kidney disorders caused by obesity 4. The binding fatty acids with albumin represents in blood generally, taking up by proximal tubular cells after glomerular filtration from albumin. A peroxisome proliferator - activated receptor (PPARα) has been suggested that it would regulate the fatty acid metabolism. Because the glomerular filtration rate and renal blood flow would increase in overweight patients 5, a large quantity of free fatty acids should be loaded into proximal tubular cells. Therefore, the investigation concerning to PPARα stimulator can be regarded as the fatty acid metabolism - regulation. One of the “Kampo” medicines, Boiogito (BO) is used for the remedy of the inflammation and cell death in obesity, is composed of eight crude drugs: Aluminum Silicate Hydrate with Silicon Dioxide, Astragalus Root, Atractylodes Rhizome, Ginger, Glycyrrhiza, Jujube, Sinomenium Stem and Rhizome. In this study, to clarify the therapeutic mechanisms of BO, we focused on the up - regulating for fatty acid metabolism through the PPARα activation.METHODSKampo formulaeBO was prepared according to the prescription for a one-day dose 6: 3.0 g Aluminum Silicate Hydrate with Silicon Dioxide, 5.0 g Astragalus Root, 3.0 g Atractylodes Rhizome, 1.0 g Ginger, 2.0 g Glycyrrhiza, 4.0 g Jujube, 4.0 g Sinomeniumstem and Rhizome.