Lipidomics of human adipose tissue reveals diversity between body areas

• Published in: PloS one 2020-06, Vol.15 (6), p.e0228521
• Main Authors: Al-Sari, Naba, Suvitaival, Tommi, Mattila, Ismo, Ali, Ashfaq, Ahonen, Linda, Trost, Kajetan, Henriksen, Trine Foged, Pociot, Flemming, Dragsted, Lars Ove, Legido-Quigley, Cristina
• Format: Article
• Language: English
• Subjects: Abdomen; Adipocytes; Adipose tissue; Adipose Tissue - metabolism; Adipose Tissue - pathology; Biochemistry; Biology and Life Sciences; Biopsy; Body fat; Breast; Chromatography; Clinical medicine; Composition; Diabetes; Diabetes mellitus; Dilution; Disease; Health aspects; High performance liquid chromatography; Humans; Identification and classification; Levels; Lipid composition; Lipid metabolism; Lipidomics; Lipids; Liquid chromatography; Mass spectrometry; Mass spectroscopy; Medicine and Health Sciences; Metabolic disorders; Metabolic syndrome; Methods; Optimization; Organ Specificity; Physical Sciences; Physiological aspects; Physiological research; Quadrupoles; Sample preparation; Scientific imaging; Spectroscopy; Thigh; Triglycerides
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0228521

Adipose tissue plays a pivotal role in storing excess fat and its composition reflects the history of person's lifestyle and metabolic health. Broad profiling of lipids with mass spectrometry has potential for uncovering new knowledge on the pathology of obesity, metabolic syndrome, diabetes and other related conditions. Here, we developed a lipidomic method for analyzing human subcutaneous adipose biopsies. We applied the method to four body areas to understand the differences in lipid composition between these areas. Adipose tissue biopsies from 10 participants were analyzed using ultra-high-performance liquid chromatography coupled to quadrupole time-of-flight mass spectrometry. The sample preparation optimization included the optimization of the lipid extraction, the sample amount and the sample dilution factor to detect lipids in an appropriate concentration range. Lipidomic analyses were performed for adipose tissue collected from the abdomen, breast, thigh and lower back. Differences in lipid levels between tissues were visualized with heatmaps. Lipidomic analysis on human adipose biopsies lead to the identification of 186lipids in 2 mg of sample. Technical variation of the lipid-class specific internal standards were below 5%, thus indicating acceptable repeatability. Triacylglycerols were highly represented in the adipose tissue samples, and lipids from 13 lipid classes were identified. Long polyunsaturated triacylglycerols in higher levels in thigh (q