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Diabetologia. 2016 Sep;59(9):2005-12. doi: 10.1007/s00125-016-4004-6. Epub 2016 Jun 7.

Treatment of diet-induced lipodystrophic C57BL/6J mice with long-acting PASylated leptin normalises insulin sensitivity and hepatic steatosis by promoting lipid utilisation.

Author information

1
Lehrstuhl für Molekulare Ernährungsmedizin and Else Kröner-Fresenius Center, Technische Universität München, Gregor-Mendel-Str. 2, 85354, Freising (Weihenstephan), Germany.
2
Research Center for Nutrition and Food Science (ZIEL), Technische Universität München, Freising (Weihenstephan), Germany.
3
Munich Center for Integrated Protein Science (CIPS-M) and Lehrstuhl für Biologische Chemie, Technische Universität München, Emil-Erlenmeyer-Forum 5, 85354, Freising (Weihenstephan), Germany.
4
Division of Chronic Inflammation and Cancer, German Cancer Research Center (DKFZ), Heidelberg, Germany.
5
Munich Center for Integrated Protein Science (CIPS-M) and Lehrstuhl für Biologische Chemie, Technische Universität München, Emil-Erlenmeyer-Forum 5, 85354, Freising (Weihenstephan), Germany. skerra@tum.de.
6
XL-protein GmbH, Freising, Germany. skerra@tum.de.
7
Lehrstuhl für Molekulare Ernährungsmedizin and Else Kröner-Fresenius Center, Technische Universität München, Gregor-Mendel-Str. 2, 85354, Freising (Weihenstephan), Germany. mk@tum.de.
8
Research Center for Nutrition and Food Science (ZIEL), Technische Universität München, Freising (Weihenstephan), Germany. mk@tum.de.

Abstract

AIMS/HYPOTHESIS:

Recombinant leptin offers a viable treatment for lipodystrophy (LD) syndromes. However, due to its short plasma half-life, leptin replacement therapy requires at least daily subcutaneous (s.c.) injections. Here, we optimised this treatment strategy in LD mice by using a novel leptin version with extended plasma half-life using PASylation technology.

METHODS:

A long-acting leptin version was prepared by genetic fusion with a 600 residue polypeptide made of Pro, Ala and Ser (PASylation), which enlarges the hydrodynamic volume and, thus, retards renal filtration, allowing less frequent injection. LD was induced in C57BL/6J mice by feeding a diet supplemented with conjugated linoleic acid (CLA). Chronic and acute effects of leptin treatment were assessed by evaluating plasma insulin levels, insulin tolerance, histological liver sections, energy expenditure, energy intake and body composition.

RESULTS:

In a cohort of female mice, 4 nmol PAS-leptin (applied via four s.c. injections every 3 days) successfully alleviated the CLA-induced LD phenotype, which was characterised by hyperinsulinaemia, insulin intolerance and hepatosteatosis. The same injection regimen had no measurable effect when unmodified recombinant leptin was administered at an equivalent dose. In a cohort of LD males, a single s.c. injection of PAS-leptin did not affect energy expenditure but inhibited food intake and promoted a shift in fuel selection towards preferential fat oxidation, which mechanistically substantiates the metabolic improvements.

CONCLUSIONS/INTERPRETATION:

The excellent pharmacological properties render PASylated leptin an agent of choice for refining both animal studies and therapeutic strategies in the context of LD syndromes and beyond.

KEYWORDS:

Conjugated linoleic acid; Fuel selection; Leptin; Lipodystrophy; Metabolic rate; PASylation; Therapeutic protein

PMID:
27272237
DOI:
10.1007/s00125-016-4004-6
[Indexed for MEDLINE]

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