title: Rosiglitazone enhances apolipoprotein M (Apom) expression in rat's liver.
abstract: Apolipoprotein M (APOM) has been suggested as a vasculoprotective constituent of high density lipoprotein (HDL), which plays a crucial role behind the mechanism of HDL-mediated anti-atherosclerosis. Previous studies demonstrated that insulin resistance could associate with decreased APOM expressions. In agreement with our previous reports, here, we further confirmed that the insulin sensitivity was also reduced in rats treated with high concentrations of glucose; such effect could be reversed by administration of rosiglitazone, a peroxisome proliferator-activated receptor-γ (PPARγ). The present study shows that Apom expression is significantly affected by either rosiglitazone or hyperglycemia alone without cross interaction with each other, which indicates that the pathway of Apom expression regulating by hyperglycemia might be differed from that by rosiglitazone. Further study indicated that hyperglycemia could significantly inhibit mRNA levels of Lxrb (P=0.0002), small heterodimer partner 1 (Shp1) (P<0.0001), liver receptor homologue-1 (Lrh1) (P=0.0012), ATP-binding cassette transporter 1 (Abca1) (P=0.0012) and Pparb/d (P=0.0043). Two-way ANOVA analysis demonstrated that the interactions between rosiglitazone and infusion of 25% glucose solution on Shp1 (P=0.0054) and Abca1 (4E, P=0.0004) mRNA expression was statistically significant. It is concluded that rosiglitazone could increase Apom expression, of which the detailed mechanism needs to be further investigated. The downregulation of Apom by hyperglycemia might be mainly through decreasing expression of Pparg and followed by inhibiting Lxrb in rats.
authors.affiliation: 1. Comprehensive Laboratory, the Third Affiliated Hospital of Soochow University, Changzhou 213003, P.R. China.
authors.forename: Guanghua
authors.initials: G
authors.lastname: Luo
authors.affiliation: 1. Comprehensive Laboratory, the Third Affiliated Hospital of Soochow University, Changzhou 213003, P.R. China.
authors.forename: Yuehua
authors.initials: Y
authors.lastname: Feng
authors.affiliation: 1. Comprehensive Laboratory, the Third Affiliated Hospital of Soochow University, Changzhou 213003, P.R. China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhang
authors.affiliation: 1. Comprehensive Laboratory, the Third Affiliated Hospital of Soochow University, Changzhou 213003, P.R. China.
authors.forename: Qinfeng
authors.initials: Q
authors.lastname: Mu
authors.affiliation: 1. Comprehensive Laboratory, the Third Affiliated Hospital of Soochow University, Changzhou 213003, P.R. China.
authors.forename: Yuanping
authors.initials: Y
authors.lastname: Shi
authors.affiliation: 1. Comprehensive Laboratory, the Third Affiliated Hospital of Soochow University, Changzhou 213003, P.R. China.
authors.forename: Li
authors.initials: L
authors.lastname: Qin
authors.affiliation: 1. Comprehensive Laboratory, the Third Affiliated Hospital of Soochow University, Changzhou 213003, P.R. China.
authors.forename: Lu
authors.initials: L
authors.lastname: Zheng
authors.affiliation: 3. Division of Clinical Chemistry and Pharmacology, Department of Laboratory Medicine, Lunds University, S-221 85 Lund, Sweden.
authors.forename: Maria
authors.initials: M
authors.lastname: Berggren-Söderlund
authors.affiliation: 3. Division of Clinical Chemistry and Pharmacology, Department of Laboratory Medicine, Lunds University, S-221 85 Lund, Sweden.
authors.forename: Peter
authors.initials: P
authors.lastname: Nilsson-Ehle
authors.affiliation: 2. Department of Cardiothoracic Surgery, the Third Affiliated Hospital of Soochow University, Changzhou 213003, P.R. China;
authors.forename: Xiaoying
authors.initials: X
authors.lastname: Zhang
authors.affiliation: 3. Division of Clinical Chemistry and Pharmacology, Department of Laboratory Medicine, Lunds University, S-221 85 Lund, Sweden.
authors.forename: Ning
authors.initials: N
authors.lastname: Xu
mesh_terms: D000818:Animals; D001053:Apolipoproteins / Q000378:metabolism*; D000075243:Apolipoproteins M; D005786:Gene Expression Regulation / Q000187:drug effects*; D006943:Hyperglycemia / Q000378:metabolism; D007004:Hypoglycemic Agents / Q000494:pharmacology; D054834:Lipocalins / Q000378:metabolism*; D008099:Liver / Q000187:drug effects* / Q000378:metabolism*; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D000077154:Rosiglitazone; D045162:Thiazolidinediones / Q000494:pharmacology*
chemical_list: D001053:Apolipoproteins; D000075243:Apolipoproteins M; C521701:Apom protein, rat; D007004:Hypoglycemic Agents; D054834:Lipocalins; D045162:Thiazolidinediones; D000077154:Rosiglitazone
keywords: ATP-binding cassette transporter 1.; Apolipoprotein M; Hyperglycemia; Insulin sensitivity; Liver receptor homologue-1