Tumor necrosis factor superfamily ligand mRNA expression profiles differ between humans and mice during homeostasis and between various murine kidney injuries
© The Author(s). 2017
Received: 24 July 2017
Accepted: 14 September 2017
Published: 19 September 2017
Several tumour necrosis factor (TNF) based therapeutics have already been approved for human use and several others are emerging. Therefore, we determined the mRNA expression levels of the TNF superfamily ligands (TNFSF) – e.g. TNF-α, lymphotoxin (LT)-α, LT-β, Fas-L (CD95-L), TNF-related apoptosis-inducing ligand (TRAIL), TNF-related weak inducer of apoptosis (TWEAK), 4-1BBL, OX40-L (CD252) and amyloid precursor protein (APP) in healthy human and mouse solid organs.
We used quantitative real time-PCR to analyse mRNA expression levels of TNFSF ligands. Murine models of acute ischemic renal injury, chronic oxalate nephropathy, and immune complex glomerulonephritis were used. Renal injury was assessed by PAS staining, and infiltrating immune cells were analysed by immunohistochemistry. Data was analysed using non-parametric ANOVA (non-parametric; Kruskal-Wallis test).
We observed significant differences in the mRNA expression levels of TNFSF ligands in human and mouse solid organs. Furthermore, we determined their mRNA expressions during acute and chronic kidney injuries in mice. Our data demonstrate that the mRNA expression levels of TNFSF vary depending on the type of tissue injury – for example, acute ischemic renal injury, chronic crystalline nephropathy, and immune complex glomerulonephritis. In addition, we observed that mRNA expressions of TNFSF ligands are differentially regulated during the course of a transient ischemic renal injury (IRI) and chronic kidney modelling. We observed that TNF-α, LT-β, and 4-1BBL were significantly upregulated during the progression of IRI and crystal-induced chronic kidney disease (CKD), whereas only 4-1BBL and TNF-α were significantly upregulated and LT-β was significantly downregulated during the progression of immune complex glomerulonephritis. The mRNA expression of Fas-L was higher during IRI whereas it decreased in a time dependent manner during the progression of crystal-induced CKD.
We conclude that the injury- and species-specific differences of TNFSF ligands must be considered in order to avoid the misinterpretation and wrong conclusions during data extrapolation between species.
The potential of tumor necrosis factor (TNF) as a therapeutic target was exploited and has been well characterized in various diseases soon after its discovery in 1975 [1, 2]. Until today, research in this field unveiled the existence of 19 TNF superfamily (TNFSF) proteins that signal through 29 receptors . The TNFSF members are expressed widely and play major roles in immune responses, inflammation, cell homeostasis, and tissue repair [4, 5]. In addition, they also contribute to disease pathogenesis, and therefore, are also referred as “double-edged swords” . Most of the TNFSF members are type II transmembrane proteins, while some can be secreted proteins with biological activity [6, 7]. Originally, macrophages were reported as a source of TNF . However, later on, a cytokine lymphotoxin (LT), which has similar cytotoxic effects like TNF, was reported to be secreted by B lymphocytes . In 1984, the homology between TNF and LT was unveiled when they were purified to homogeneity and their amino acid sequences were determined [9, 10]. This initiated the hunt for more TNF-like proteins leading to the discovery of 19 TNFSF ligands until today .
The TNFSF ligands have C-terminal TNF homolog domain facilitating self-trimerization and receptor binding. The TNF-receptor superfamily has two domains consisting of an extracellular domain for ligand binding and a cytoplasmic tail domain with adaptor proteins for signal cascade activation [6, 7]. After binding to the respective receptors, all members of the TNFSF activate pathways that involve NF-ĸB, JUN N-terminal kinase (JNK), p42/44 mitogen-activated protein kinase (MAPK), p38 MAPK and generation of reactive oxygen species (ROS) that orchestrate the pleiotropic effects of TNFSF ligands .
A huge amount of research on TNFSF ligands is conducted in mice and the observations are often extrapolated to human conditions. However, several discrepancies in organ-specific expression levels of pattern recognition receptors (PRRs), C-type lectin receptors (CLRs), TLR accessory molecules as well as regulated necrosis-related molecules, between species has already been reported [12–18]. Therefore, we hypothesized that similar organ- and species-specific differences might exist in TNFSF ligands expressions, and hence, determined their mRNA expression profiles in human and mice organs. Furthermore, we checked their expression profiles in murine acute tissue injury and chronic (progressive and immune complex-mediated) tissue remodeling.
Human solid organ cDNA preparation
Total RNA from healthy human solid organ were purchased from Clontech, Mountain View, CA. From each individual sample, an equal amount of total RNA was used as a template in cDNA preparation using Superscript II (Invitrogen). As only a single pool was available for each organ, no studies on biological replicates allowing statistics could be performed. However, we used technical triplicates of each pooled sample. Usage of human solid organ RNA samples obeys the purchase and import of Clontech local laws and regulations.
Mouse solid organ cDNA preparation for qRT-PCR experiments
Ten-twelve weeks old, adult C57BL/6 N male mice were purchased from Charles River, Sulzfeld, Germany. Group of five mice in a cage were housed in specific pathogen-free conditions with ad libitum food and water. Mice were sacrificed under general anesthesia by cervical dislocation. From freshly collected tissues, RNA was isolated as described . Briefly, all organs immediately after harvest were placed in RNA later solution and RNA was isolated with an equal amount of tissue mass using Pure Link RNA Mini Kit (Ambion, Germany) according to the manufacture instructions. All RNA samples were subjected to DNAse enzyme treatment and additional washing steps were performed to remove traces of DNAse. A NanoDrop 1000 Spectrophotometer was used to estimate the RNA concentrations, only samples with absorbance 260/280 between 1.95 and 2.05 were considered as pure RNA. The integrity of the total RNA was determined by electrophoresis on 2% (w/v) agarose gels as described. Further, cDNA was transcribed using 1 μg of RNA as described before . Briefly, 1 μg RNA was mixed with cDNA master mix (including DTT, dNTPS, Rnasin, Acrylamide, Hexanucleotide and Superscript II), and incubated for 1 h 30 min at 42 °C. Supercript was inactivated by incubating at 90 °C for 5 min and cDNA was stored at −20 °C until further use.
Renal Ischemic injury model: Groups of seven to eight week old C57BL/6 mice (n = 5–10) under anesthesia underwent unilateral renal pedicle clamping for 35 min followed by reperfusion for 24 h, 5 days and 10 days as a model of ischemia-reperfusion as described [19–21]. Throughout the procedure, body temperatures were maintained at 37 °C using a heating plate (Kleintier-OP-Tisch M12511, Medax GmbH, Germany) and an egg breeding device (Octagon 20 Advance, Brinsea products Ltd., UK). Injured and contralateral kidneys were harvested for RNA isolation and histology analysis. Contralateral kidneys served as internal control kidneys. Chronic oxalate nephropathy model was developed by feeding mice with an oxalate-rich diet that was prepared by adding 50 μmol/g sodium oxalate to a calcium-free standard diet (Ssniff, Soest, Germany) as previously described [22, 23]. Mice were sacrificed at day 7, 14 and 21 after exposure to oxalate-rich diet. Autologous anti-GBM glomerulonephritis model was developed by immunizing mice subcutaneously in both flanks with 20 μg rabbit IgG (Jackson ImmunoResearch Laboratories, West Grove, PA) in Freund’s complete adjuvant (Sigma-Aldrich, Deisenhofen, Germany). Three days later, mice received 150 μl nephrotoxic rabbit serum intravenously . Animals were sacrificed on day 14, 21 and 42 days after anti-GBM serum challenge. Kidney samples were harvested for RNA isolation and histology analysis. All experimental procedures on animals were approved by the Regierung von Oberbayern, München, Germany, and were performed in accordance with their guidelines and regulations.
Quantitative real time-PCR
Primers used for RT-PCR
Forward Sequence (5´➔3′)
Reverse Sequence (3´➔ 5′)
After sacrifice, portions of harvested kidney tissues were fixed in 4% neutral-buffered formalin, followed by dehydration in graded alcohols and embedded in paraffin. For further analysis such as periodic acid-Schiff (PAS) staining or immunostaining 4 μm sections were deparaffinized, rehydrated, transferred into citrate buffer, and either autoclaved or microwave treated for antigen retrieval and processed as described . For immunostaining following primary antibodies were used: Collagen1α1 (Dako, Hamburg, Germany), anti-mouse CD3, anti-mouse F4/80 (both Serotec, Oxford, UK).
Data were represented as mean ± standard error of the mean (SEM). Comparisons between groups were performed using non-parametric ANOVA (non-parametric; Kruskal-Wallis test). A p-value less than 0.05 was chosen as statistical significance.
TNF superfamily ligands mRNA expressions in adult human tissues
TNF superfamily ligands mRNA expressions in adult murine tissues
TNF superfamily ligands mRNA expressions in murine acute kidney injury
TNF superfamily ligands mRNA expressions in murine chronic kidney disease
TNF superfamily ligands mRNA expressions in chronic immune complex glomerulonephritis
The TNFSF ligands exert pleiotropic effects . Although they evolved mainly for the regulation of immune cells in our body, over the years they have been reported to be involved in several pathogenic disorders as well. Here, our data demonstrate that alike PRRs , CLRs , TLR accessory molecules , and regulated necrosis-related molecules , the relative mRNA expression profiles of TNFSF ligands differ between physiological conditions in humans and mice, as well as between various pathophysiological conditions in mice.
All TNFSF ligands activate NF-ĸB signalling, albeit to different extent, therefore, the pathologies related to them mostly involve NF-ĸB signalling-mediated inflammation, for example – acute IRI. Several studies have reported the contribution of TNFSF ligands e.g. Fas-L, TWEAK and TNF-α, which are secreted by infiltrating immune cells, to intrarenal inflammation during IRI [29–32]. Accordingly, we observed a robust increase in the mRNA expression levels of TNFSF ligands after IRI that was also associated with increased intrarenal immune cell infiltration. Recently, TWEAK mRNA expressions were also reported to be increased in various mouse models of CKD such as lupus nephritis, immune complex glomerulonephritis, as well as rat and human diabetic nephropathy . On the contrary, although TRAIL mRNA expression was increased at day 1 after IRI , we did not observe changes in the TRAIL mRNA expression at later time points in our study. Moreover, we observed that the expression levels of TNFSF ligands were highest during the healing phase after IRI, suggesting their putative involvement during tubule regeneration after an injury . It may therefore interesting to explore whether TNFSF ligands contribute to regeneration/healing process upon acute kidney injury IRI.
Different functional states of immune cells regulate the process of regeneration upon kidney injury. Persistent inflammation is deleterious since it promote chronic tissue remodelling (fibrosis) . We studied progressive kidney fibrosis using a murine model of oxalate-induced CKD. Although, we observed a robust increase in the mRNA expression levels of most TNFSF ligands in association with infiltrating immune cells, the expression patterns in progressive kidney injury were different from transient kidney injury observed in the IRI model. This suggests that different pathologies are driven by different TNFSF ligands. Interestingly, the injection of recombinant murine TNF-α in mice increased the expressions of TNF receptors (TNFRs) in the kidney . Accordingly, the increased mRNA expression of TNF-α in kidneys of mice exposed to oxalate-rich diet can be linked to the already reported increased expression of TNFRs on tubular epithelium during the progression of oxalate-induced CKD . TNFR induction supports the adhesion of calcium oxalate crystals to tubular epithelium and hence nephrocalcinosis eventually leading to CKD . Moreover, TNF-α has also been reported to contribute to the pathogenesis of other forms of CKD – for example, diabetic nephropathy, Alport glomerulosclerosis, and chronic ischemic renal injury [35–37]. Therefore, it will be interesting to study the functional contribution of each of the other induced TNFSF ligands, as well as their receptors, during the progression of CKD.
In addition to the persistent trigger, chronic inflammation can also arise from tissue deposition of immune complex . Surprisingly, unlike transient and persistent injuries, immune complex injury showed sharp differences in the mRNA expression patterns of TNFSF ligands, which did not at all correlate with the increased renal infiltration of immune cells. This suggests that the different pathomechanisms alter the mRNA expression of TNFSF ligands. Nevertheless, we observed a robust increase in the mRNA expression of TWEAK and TNF-α in the early phase, which was already shown to contribute to the disease pathology in mice, as well as human, kidney disease [32, 39–41]. Therefore, it would be interesting to study the specific contribution of all the induced genes in immune complex mediated renal injuries.
Furthermore, as TNFSF receptors mediate the effects of TNFSF ligands, the contribution of TNFSF ligands to disease pathologies also depend on TNFSF receptor expressions [3, 23, 42]. Hence, studying the organ- and species differences in expression of TNFSF receptors along with TNFSF ligands during health and disease conditions deserves careful consideration.
We identified several TNFSF ligands that are induced during ischemic CKD, crystalline CKD, as well as immune complex glomerulonephritis. In addition, we have identified significant differences in the mRNA expression profiles of the TNFSF ligands in humans and murine solid organs during physiological conditions. Therefore, our data give robust reasons to consider these species-specific differences of TNFSF ligands in order to avoid the misinterpretation and wrong conclusions during data extrapolation between species. Since TNF-based therapeutics are already approved for human use, and several more are likely to be found in the future based on TNFSF ligands, the findings of our study recommend validating results of rodent studies, not only kidney diseases but also other pathogenic disorders, in human studies.
We gratefully acknowledge the expert technical support of Dan Draganovici, Jana Mandelbaum.
The work was supported by the Deutsche Forschungsgemeinschaft (DFG) (MU3906/1-1).
Availability of data and materials
All data and materials are available.
SKD and SRM designed the study concept and experiments. SKD, JFG, JX, MW, MH, VV, SRM performed the experiments. SKD and SRM wrote the manuscript. SKD, HJA and SRM read and finalized the manuscript. All authors read and approved the final manuscript.
SKD is the first author and SRM is the corresponding author.
Ethics approval and consent to participate
All experimental procedures on animals were approved by the Regierung von Oberbayern, München, Germany, and were performed in accordance with their guidelines and regulations. Usage of human solid organ RNA samples obeys the purchase and import of Clontech local laws and regulations.
Consent for publication
All the authors have consented for publication.
The authors declare that they have no competing interests.
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