3D rendering of the crystal structure of Vaspin

Heiker Lab

Adipocyte Communication and Tissue Homeostasis

How do adipocytes communicate with immune cells, the extracellular environment and other organs?

Adipose tissue is a dynamic endocrine and immunological organ that continuously communicates with neighboring cells and distant metabolic tissues. This communication is mediated by a complex network of secreted proteins, proteolytic enzymes, extracellular matrix remodeling, receptor signaling, and intracellular regulatory pathways that together maintain adipose tissue homeostasis. In obesity, these communication networks become disrupted, resulting in chronic inflammation, impaired metabolic function, insulin resistance, and reduced thermogenic capacity.

Our research aims to understand the molecular mechanisms that coordinate adipocyte communication in health and disease. We investigate how adipokines, serpins, proteases and other protein regulators shape interactions between adipocytes, immune cells, vascular cells and the extracellular matrix. Using complementary approaches ranging from recombinant protein biochemistry and structural studies to primary human adipocytes, mouse models and multi-omics analyses, we identify signaling pathways that regulate inflammation, lipid metabolism and tissue remodeling.

Particular emphasis is placed on multifunctional protein regulators whose activities extend beyond their classical roles. Our work has uncovered unexpected mechanisms through which proteins such as the serpin vaspin and kallikrein proteases influence adipocyte biology, immune cell recruitment, thermogenic function and metabolic homeostasis. By defining these communication networks at molecular resolution, we aim to identify novel therapeutic strategies that preserve healthy adipose tissue function and prevent obesity-associated metabolic disease.

Our goal is to define the protein networks that coordinate adipose tissue communication and to exploit these pathways to prevent inflammation and metabolic dysfunction.

Selected Discoveries

2025 Nature Communications, 16:11075

Rapöhn I, Broghammer H, Hoffmann A, Möhlis K, Moormann A, Kaczmarek I, Thor D, Großkopf H, Krieg L, Karkossa I, Schubert K, von Bergen M, Krause K, Breitfeld J, Kovacs P, Klöting N, Nuwayhid R, Langer S, Ghosh A, Wolfrum C, Stumvoll M, Blüher M, Heiker JT°, Weiner J

Inhibition of adipocyte lipolysis by vaspin impairs thermoregulation in vivo. We show that internalized vaspin regulates adipocyte lipolysis and thermogenic activity through LRP-family receptor signaling, revealing a multifunctional role that extends beyond classical protease inhibition.
2025 Metabolism, 168:156239.

Ribas-Latre A, Hoffmann A, Gebhardt C, Weiner J, Arndt L, Raulien N, Gericke M, Gosh A, Krause K, Klöting N, Pfluger PT, Sheikh BN, Ebert T, Tönjes A, Stumvoll M, Wolfrum C, Blüher M, Wagner U, Vendrell J, Fernández-Veledo S, Heiker JT

The serine protease KLK7 promotes immune cell infiltration in visceral adipose tissue in obesity. We identify the serine protease KLK7 as a key regulator of immune cell recruitment into visceral adipose tissue, linking proteolytic signaling to obesity-associated inflammation.
2025 FEBS J; 293(7):2119-2132

Möhlis K, Useini A, Bonin S, Betat H, Bonin S, Broghammer H, Nuwayhid R, Langer S, Mörl M, Sträter N, Heiker JT

Vaspin identified as a DNA-binding serpin with structural insights and functional consequences for protease inhibition We establish vaspin as only the second known human DNA-binding serpin, providing evidence for intracellular and nuclear functions beyond its established extracellular activities.
2023 FEBS J, 291(10):2134-2154.

Tindall CA, Möhlis K, Rapöhn I, Dommel S, Riedl V, Schneekönig M, Höfling C, Roßner S, Stichel J, Beck-Sickinger AG, Weiner J, Heiker JT

LRP1 is the cell-surface endocytosis receptor for vaspin in adipocytes We identify LRP1 as the endocytic receptor responsible for vaspin internalization, providing the mechanistic basis for its intracellular signaling functions.
2021 Adipocyte, 10(1):216-31

Tindall CA, Erkner E, Stichel J, Beck-Sickinger AG, Hoffmann A, Weiner J, Heiker JT

Cleavage of the Vaspin N-terminus Releases Cell-Penetrating Peptides that Affect Early Stages of Adipogenesis and Inhibit Lipolysis in Mature Adipocytes We discover that cleavage of the vaspin N-terminus releases cell-penetrating peptides that modulate adipogenesis and adipocyte lipolysis, expanding the functional repertoire of this serpin.

Contact Project Leader

MA-Foto John Heiker_freigestellt
PD Dr. Dr. John Heiker

Group Leader of Molecular Obesity Research, HI-MAG

Leipzig

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