Clinical trial NCT03137056: Characterization of Removal Capacities of the Theranova Membrane by Proteomic Investigations
Official title: Characterization of Proteins and Forms of Albumin Removal Capacities of the Theranova Membrane by Innovating Proteomic Investigations
Study type: INTERVENTIONAL
Overall status: UNKNOWN
Phase: NA
Conditions: Dialysis Membrane Reaction
Keywords: Hemodialysis
Membrane
Albumin
Proteomics
Lead sponsor: Hospices Civils de Lyon
Sponsor class: OTHER
First posted: 2017-05-02
Enrollment: 20
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: NON_RANDOMIZED
Intervention model: CROSSOVER
Primary purpose: OTHER

Brief summary: Hemodialysis is the major technique of renal suppleance and membrane improvements allow an efficient depuration. During the past fifty years, improving the architecture of the membranes increased constantly the clearance of uremic toxins. Online-hemodiafiltration allowed a potential interest for decreasing morbi-mortality, but this technique is not available in all hemodialysis centers yet. Theranova membrane, by its innovating architecture, could be a valuable option for the enhancement of toxin removal in patients who are not eligible for online-hemodiafiltration techniques. Interestingly, many works pointed adsorptive capacities of dialysis membranes and these observations suggest that adsorption cannot be considered as an epiphenomenon. However, there is a lack of knowledge about the extent of its benefits in hemodialysis. The efficiency of a session of hemodialysis is routinely based on the clearance of only few generic toxins (urea, ß2-microglobulin, myoglobin). The eKT/V formula permitted to link a good depuration of urea with a better survival. EuTox described in a recent review, a large panel of middle molecules considered as uremic toxins. As there are many involved toxins, modern evaluation of hemodialysis efficiency can't be still based on the only description of ß2-microglobulin and urea removals. Inflammation status is routinely measured with blood levels of CRP. However, its accumulation is not leading to a toxicity. Many others inflammatory markers have been linked with morbidity and atherosclerosis, the main cause of mortality in ESRD patients. Obviously, removal of inflammatory markers by different dialyzers needs to be assess concomitantly but single conventional dosages are time-consuming.

A minimal albumin loss is considered as another important factor for a safe hemodialysis. Due to its multiple biological functions, albumin may be one of the most important protein for the maintenance of body homeostasis. Recent works were interested in the potential toxicity of some isoforms of the albumin and especially in chronic kidney disease. Modified forms of albumin have been linked with toxic properties and the removal of modified forms could be beneficial. Furthermore, albumin oxidation can lead to an under-estimation of albumin levels with the routinely used assay. A modern evaluation of the capacities of depuration of dialyzers clearly needs to integrate the evaluation of the clearance and generation of modified forms of albumin and proteins.

Proteomic techniques allow an interesting non-selective integrative approach. This exhaustive view would be particularly adequate for building a snapshot of blood uremic toxins, permeative and adsorptive capacities of each membrane. Due to a high sensitiveness, proteomic techniques can improve dramatically the characterization of the depuration capacities of different hemodialysis membranes considering a large range of uremic toxins especially with middle molecular weight, a large panel of inflammatory markers and modified forms of albumin. Furthermore, proteomic approach can help to build a quasi-exhaustive description of all the proteins removed by a membrane.

This project aims to compare the removal capacities of each membrane on a large range of proteins and forms of albumin (native and modified) with a highly-sensitive LC-MS/MS proteomic approach. We will also build the complete proteome of depuration of each tested membrane.


Eligibility criteria: Inclusion Criteria:

* Age ≥ 18 years old
* Patient on hemodialysis for at least 1 year
* Patient with a functional vascular access permitting at least 300 mL/min of blood flow.

Exclusion Criteria:

* Running infection or other active disease (scheduled surgery, cancer, hospitalisation),
* Catheter as vascular access,
* Recirculation of vascular access over 10%.

Primary outcomes:
measure: Comparison of Theranova and FX1000 in high-flux hemodialysis on whole proteome of depuration (qualitative and semi-quantitative description of all the proteins depurated by absorption and convection)
timeFrame: Proteome is evaluated after an 8-weeks session of use of each membrane
Secondary outcomes:
measure: Comparison of Theranova, FX1000 in high-flux hemodialysis and FX1000 in online-hemodiafiltration on differential depuration capacities among albumin isoforms, albumin loss in the dialysate and adsorbed onto the membranes
timeFrame: Isoforms of albumin are evaluated at week 1 and week 8 of use of each membrane and before and after a hemodialysis session during week 1
measure: Comparison of Theranova and FX1000 in high-flux hemodialysis on quantitative removal of protein-bounded toxins and quantitative distribution of inflammatory markers removed by dialysis.
timeFrame: Evaluation after a 8-weeks session of use of each membrane
measure: Comparison of eKT/V of urea and ß2-microglobulin, removal rates and amount in the dialysate of ß2-microglobulin and myoglobin.
timeFrame: Evaluation after a 8-weeks session of use of each membrane
measure: Comparison of serum albumin level after 8 weeks of hemodialysis with (Theranova in hemodialysis, FX1000 in online-hemodiafiltration, FX1000 in hemodialysis)
timeFrame: Evaluation after a 8-weeks session of use of each membrane
Other outcomes:
Locations:
city: Lyon
country: France
facility: Service de Néphrologie -Hypertension - Hémodialyse, Hôpital Edouard Herriot
Study officials:
References: