Differentiation of 3T3-L1 Fibroblasts Into Adipocytes.

Obesity and type 2 diabetes (T2D) have reached epidemic proportions worldwide, affecting millions of people and contributing to serious health complications, such as metabolic syndrome, cardiovascular disease, and cancer. Adipose tissue is an endocrine organ that serves crucial physiological roles in energy homeostasis. However, excessive adipocyte hypertrophy and altered adipokine profiles underscore metabolic diseases. Understanding the molecular mechanisms governing adipocyte dysfunction is therefore of paramount importance in developing targeted interventions. 3T3-L1 adipocytes have been a cornerstone adipogenic model since their establishment in the 1970s. The enduring popularity of this model is owed to its efficient differentiation capacity, faithful recapitulation of adipogenesis in vivo, and amenability to genetic manipulation. We present detailed protocols for the differentiation and phenotypical assessment of 3T3-L1 adipocytes. We include how to perform lipid-based staining to assess the efficiency of 3T3-L1 differentiation, as well as quantify lipid accumulation per cell. Moreover, we provide step-by-step instructions on performing radiolabeled 2-deoxy-d-glucose uptake in 3T3-L1 adipocytes in response to insulin. © 2026 Wiley Periodicals LLC. Basic Protocol 1: Differentiation of 3T3-L1 fibroblasts into adipocytes Support Protocol 1: Quantification of adipogenic differentiation by Oil Red O staining Support Protocol 2: Quantification of adipogenic differentiation by Nile red and DAPI co-staining Basic Protocol 2: Measurement of radiolabeled glucose uptake in 3T3-L1 adipocytes.