Effect of huanglian jiedu decoction on thoracic aorta gene expression in spontaneous hypertensive rats.

Objective. Hypertension is one of the most common cardiovascular disorders with high mortality. Here we explored the antihypertension effects of Huanglian Jiedu Decoction (HJD) on thoracic aorta gene expression in spontaneous hypertensive rats. Methods. A rat model of spontaneous hypertension was used. The gene change profile of thoracic aorta after JHD treatment was assessed by GeneChip(GC) analysis using the Agilent Whole Rat Genome Oligo Microarray. Results. Hypertension induced 441 genes upregulated and 417 genes downregulated compared with the normal control group. Treatment of HJD resulted in 76 genes downregulated and 20 genes upregulated. GC data analysis showed that the majority of change genes were involved in immune system process, developmental process, and cell death. Conclusion. Hypertension altered expression of many genes that regulate various biological functions. HJD significantly reduced hypertension and altered the gene expression profiles of SHR rats. These changing genes were involved in many cellular functions such as regulating smooth muscle contraction, Ca(2+) homeostasis, and NO pathway. This study provides the potential novel insights into hypertension and antihypertension effects of HJD.

Identification of all classes of spin-trapped carbon-centered radicals in soybean lipoxygenase-dependent lipid peroxidations of omega-6 polyunsaturated fatty acids via LC/ESR, LC/MS, and tandem MS.

Using the combined techniques of on-line high performance liquid chromatography/electron spin resonance (LC/ESR) and mass spectrometry (MS), we previously identified spin-trapped adducts of all expected carbon-centered lipid-derived radicals ((*)L(d)) formed in linoleic acid peroxidation. In the present study, spin trapped lipid-derived carbon-centered radicals formed from the reactions of two omega-6 polyunsaturated fatty acids (PUFAs: linoleic and arachidonic acids) with soybean lipoxygenase in the presence of alpha-[4-pyridyl 1-oxide]-N-tert-butyl nitrone (POBN) were identified using a combination of LC/ESR and LC/MS. All expected lipid-derived carbon-centered radicals in lipoxygenase-dependent peroxidations of linoleic acid and arachidonic acid were detected and identified by the combination of LC/ESR and LC/MS with confirmation by tandem mass spectrometry (MS/MS). The five classes of (*)L(d) formed from both omega-6 PUFAs including lipid alkyl radicals (L(*)), epoxyallyic radicals (OL(*)), dihydroxyallyic radicals ((*)L(OH)(2)), and a variety of R(*) and (*)RCOOH from beta-scission of lipid alkoxyl radicals, gave distinct retention times: POBN/(*)L(OH)(2) approximately 4-6 min, POBN/R(*) and POBN/(*)RCOOH approximately 8-22 min, POBN/L(*) and PBON/OL(*) approximately 25-36 min. The major beta-scission products in peroxidations of omega-6 PUFAs were the pentyl radicals. The ratio of beta-scission products, however, varied significantly depending on pH, [PUFA], as well as [O(2)].

Characterization of the initial carbon-centered pentadienyl radical and subsequent radicals in lipid peroxidation: identification via on-line high performance liquid chromatography/electron spin resonance and mass spectrometry.

The previously reported combination of an on-line high-performance liquid chromatography (LC)/electron spin resonance (ESR) system with mass spectrometric analysis (MS) created a unique technique to identify a variety of lipid-derived radicals ((.)L(d)) formed from in vitro lipid peroxidation (Iwahashi et al. [20]). To improve the sensitivity, resolution, and reliability of this method for in vitro and in vivo studies, we have investigated the effects of mobile phase pH, modifiers, and columns on the chromatographic separation of linoleic acid-derived radical adducts. Using tetrahydrofuran (THF) and 0.1% glacial acetic acid (HOAc) in an H(2)O/acetonitrile (ACN) mobile phase greatly increased the resolution and retention reproducibility of lipid radical adducts in LC/ESR. In addition, these modifications allowed the elimination of an ESR tuning problem and the synchronization of UV and ESR detection of radical adducts in on-line LC/ESR, neither of which had been possible previously. Analyte purity was therefore increased, thus increasing the reliability of radical detection via on-line LC/ESR as well as radical identification via MS analysis. For the first time, POBN adducts of linoleic carbon-centered pentadienyl radicals (L(.)) were detected and identified. The optimization of chromatography in the LC/ESR and MS combination provided a reliable and sensitive way for the detection and identification of expected radical adducts in vitro and in vivo.