Universität zu Köln

Braehler, Sebastian, Ising, Christina ORCID: 0000-0002-7267-3488, Hagmann, Henning, Rasmus, Melanie, Hoehne, Martin, Kurschat, Christine, Kisner, Tuelay, Goebel, Heike, Shankland, Stuart, Addicks, Klaus, Thaiss, Friedrich ORCID: 0000-0002-0357-4726, Schermer, Bernhard ORCID: 0000-0002-5194-9000, Pasparakis, Manolis ORCID: 0000-0002-9870-0966, Benzing, Thomas and Brinkkoetter, Paul Thomas (2012). Intrinsic proinflammatory signaling in podocytes contributes to podocyte damage and prolonged proteinuria. Am. J. Physiol.-Renal Physiol., 303 (10). S. F1473 - 13. BETHESDA: AMER PHYSIOLOGICAL SOC. ISSN 1931-857X

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Abstract

Brahler S, Ising C, Hagmann H, Rasmus M, Hoehne M, Kurschat C, Kisner T, Goebel H, Shankland S, Addicks K, Thaiss F, Schermer B, Pasparakis M, Benzing T, Brinkkoetter PT. Intrinsic proinflammatory signaling in podocytes contributes to podocyte damage and prolonged proteinuria. Am J Physiol Renal Physiol 303: F1473-F1485, 2012. First published September 12, 2012; doi:10.1152/ajprenal.00031.2012.-Inflammation conveys the development of glomerular injury and is a major cause of progressive kidney disease. NF-kappa B signaling is among the most important regulators of proinflammatory signaling. Its role in podocytes, the epithelial cells at the kidney filtration barrier, is poorly understood. Here, we inhibited NF-kappa B signaling in podocytes by specific ablation of the NF-kappa B essential modulator (NEMO, IKK gamma). Podocyte-specific NEMO-deficient mice (NEMOpko) were viable and did not show proteinuria or overt changes in kidney morphology. After induction of glomerulonephritis, both NEMOpko and control mice developed significant proteinuria. However, NEMOpko mice recovered much faster, showing rapid remission of proteinuria and restoration of podocyte morphology. Interestingly, quantification of infiltrating macrophages, T-lymphocytes, and granulocytes at day 7 revealed no significant difference between wild-type and NEMOpko. To further investigate the underlying mechanisms, we created a stable NEMO knockdown mouse podocyte cell line. Again, no overt changes in morphology were observed. Translocation of NF-kappa B to the nucleus after stimulation with TNF alpha or IL-1 was sufficiently inhibited. Moreover, secretion of proinflammatory chemokines from podocytes after stimulation with TNF alpha or IL-1 was significantly reduced in NEMO-deficient podocytes and in glomerular samples obtained at day 7 after induction of nephrotoxic nephritis. Collectively, these results show that proinflammatory activity of NF-kappa B in podocytes aggravates proteinuria in experimental glomerulonephritis in mice. Based on these data, it may be speculated that immunosuppressive drugs may not only target professional immune cells but also podocytes directly to convey their beneficial effects in various types of glomerulonephritis.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Braehler, Sebastian UNSPECIFIED UNSPECIFIED UNSPECIFIED Ising, Christina UNSPECIFIED orcid.org/0000-0002-7267-3488 UNSPECIFIED Hagmann, Henning UNSPECIFIED UNSPECIFIED UNSPECIFIED Rasmus, Melanie UNSPECIFIED UNSPECIFIED UNSPECIFIED Hoehne, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Kurschat, Christine UNSPECIFIED UNSPECIFIED UNSPECIFIED Kisner, Tuelay UNSPECIFIED UNSPECIFIED UNSPECIFIED Goebel, Heike UNSPECIFIED UNSPECIFIED UNSPECIFIED Shankland, Stuart UNSPECIFIED UNSPECIFIED UNSPECIFIED Addicks, Klaus UNSPECIFIED UNSPECIFIED UNSPECIFIED Thaiss, Friedrich UNSPECIFIED orcid.org/0000-0002-0357-4726 UNSPECIFIED Schermer, Bernhard UNSPECIFIED orcid.org/0000-0002-5194-9000 UNSPECIFIED Pasparakis, Manolis UNSPECIFIED orcid.org/0000-0002-9870-0966 UNSPECIFIED Benzing, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Brinkkoetter, Paul Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-479676
DOI:	10.1152/ajprenal.00031.2012
Journal or Publication Title:	Am. J. Physiol.-Renal Physiol.
Volume:	303
Number:	10
Page Range:	S. F1473 - 13
Date:	2012
Publisher:	AMER PHYSIOLOGICAL SOC
Place of Publication:	BETHESDA
ISSN:	1931-857X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NF-KAPPA-B; GAMMA-DEFICIENT MICE; INCONTINENTIA PIGMENTI; KINASE COMPLEX; RENAL INJURY; IKK-ALPHA; ACTIVATION; GLOMERULONEPHRITIS; DEGENERATION; INFLAMMATION Multiple languages Physiology; Urology & Nephrology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47967