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REVIEW 3 major objections 4 minor 80 references

One-step decellularization of porcine uterine tissue for developing alginate-decellularized uterine ECM hydrogel for uterine tissue engineering

T0 review · 3 major / 4 minor · reviewed 2026-08-15 · deepseek-v4-flash

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Pith's one-line read A one-step decellularization protocol plus an alginate–dUECM hydrogel makes porcine uterine extracellular matrix printable and able to support human myometrial cell growth.

desk verdict Solid, reproducible dECM/alginate hydrogel paper with a correctable internal inconsistency: the selected protocol's residual DNA (51.3 ng/mg) is above the 50 ng/mg threshold it claims to meet. read the letter →

arxiv 2506.15857 v2 pith:WFF5B465 submitted 2025-06-18 q-bio.TO physics.bio-ph

Abbas Fazel Anvari Yazdi , Kobra Tahermanesh , Maryam Ejlali , Louison Blivet-Bailly , Vatsala Singh , Bishnu Acharya , Daniel J. MacPhee , Ildiko Badea
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Xiongbiao Chen
This is my paper · ORCID
classification q-bio.TOphysics.bio-ph
keywords decellularizationuterinetissueengineering3Dbioprintingalginatehydrogelextracellularmatrixmyometrialcellsbioinkporcineuterus
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

Uterine tissue engineering needs scaffolds that both mimic the native extracellular matrix and can be shaped into porous 3D structures, and no single biomaterial does both well. This paper argues that a streamlined one-step detergent wash can strip porcine uterine tissue of its cells while keeping the matrix's collagen and glycosaminoglycans, and that the resulting material can be blended with alginate into a hydrogel that prints cleanly and supports human myometrial (uterine muscle) cells. The load-bearing result is the 3% alginate + 1.5% dUECM formulation: it keeps its shape, swells modestly, degrades slowly, and in cast-gel tests raised MTT-measured cell activity to about 258% by day 7. If these findings hold, they give uterine tissue engineers a shorter decellularization route and a printable, cell-friendly ink for building uterine wall constructs.

What carries the argument

The central object is the hybrid bioink: pepsin-digested decellularized uterine extracellular matrix (dUECM) dispersed in alginate and crosslinked by calcium after printing. Its companion is the one-step decellularization bath, in which the non-ionic detergent Triton X-100 and the ionic detergent SDS are mixed in a single solution rather than applied sequentially; mixed micelles of the two detergents remove cellular material while the shorter 48-hour exposure limits GAG and collagen loss. The load-bearing formulation is 3% alginate + 1.5% dUECM, selected with a printability factor $\text{Printability} = 1 - \frac{d_t - d_e}{d_t}$, where $d_e$ is the measured strand diameter and $d_t$ the designed diameter, together with swelling, degradation, and compression data. This formulation is what carries the argument that bioactivity and printability can coexist in one uterine-tissue ink.

What would settle it

Seed hTERT-HM myometrial cells directly onto 3D-printed 3% Alg + 1.5% dUECM lattice scaffolds and measure viability and proliferation at days 1, 3, 5, and 7; if the printed strands show markedly lower viability or lose the roughly 258% day-7 activity seen on cast gels, the paper's central translational claim falls.

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Extended reading notes

Core claim

The paper's central claim is that a single 48-hour bath of 1% Triton X-100 plus 1% SDS decellularizes porcine uterine tissue well enough for tissue engineering: residual DNA falls to $51.33 \pm 9.02$ ng/mg, near the widely cited 50 ng/mg immunogenicity threshold, while GAG content stays at $54.94 \pm 7.55$ µg/mg, comparable to native tissue, and spectroscopy indicates the collagen triple helix is largely intact. It further claims that pepsin-digested dUECM blended into 3% alginate at 1.5% dUECM produces a bioink with a printability factor of $1.56 \pm 0.20$, swelling of $47 \pm 12\%$ at day 14, mass retention of $94 \pm 18\%$, and a Young's modulus that declines from about 323 kPa to 175 kPa over 14 days. On cast gels of this formulation, hTERT-HM myometrial cells attached and proliferated, reaching $258.14 \pm 12.83\%$ MTT signal by day 7 (3% alginate controls reached $145.70 \pm 31.80\%$), with spindle-shaped morphology and minimal dead cells in Live/Dead staining. The paper reads this as evidence that a hybrid alginate–dUECM hydrogel can bridge the gap between dUECM's bioactivity and alginate's printability for uterine tissue engineering.

Load-bearing premise

The load-bearing premise is that hTERT-HM cell viability and proliferation observed on cast Alg:dUECM hydrogels will carry over to the 3D-printed lattice scaffolds, which were never seeded with cells.

Editorial extensions

If this is right

  • A 48-hour one-step detergent treatment could replace multi-day sequential decellularization protocols for uterine ECM, cutting processing time and detergent exposure.
  • dUECM can be added to alginate at 1.5% without destroying printability, making uterine-specific bioactive cues available in an extrusion-printable format.
  • The 3% Alg + 1.5% dUECM scaffold retains most of its mass and stiffness over 14 days in culture medium, so it could hold its architecture long enough for cells to build tissue.
  • hTERT-HM myometrial cells attach and proliferate on the hydrogel, suggesting the ink is a viable base for uterine smooth-muscle constructs and in vitro uterine models.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • The paper's biocompatibility evidence comes from cells seeded on cast gels, not on the 3D-printed lattice scaffolds; the claim that printed constructs support cell growth is an extrapolation that still needs direct testing.
  • If printed scaffolds match the cast-gel biology, the Alg:dUECM system could be used to build layered endometrium/myometrium models for drug screening, not just grafts.
  • The protocol comparison implies a trade-off: pushing residual DNA below the 50 ng/mg threshold with more SDS or longer exposure costs GAGs and collagen, so "optimal" depends on whether immunogenicity or matrix bioactivity matters more for the target application.
  • A natural next experiment is seeding cells inside the printed lattice, not only on top, and measuring matrix remodeling and contractility, since uterine function depends on muscle contraction.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 4 minor

Summary. The manuscript develops a one-step decellularization protocol for porcine uterine tissue using 1% Triton X-100 with varying SDS concentrations (0.1–1.5%) for 48–72 h, selects 1% SDS for 48 h as optimal, and combines the resulting decellularized uterine ECM (dUECM) with alginate to form printable hydrogels. The authors characterize the dUECM by DNA and GAG quantification, histology, SEM, FTIR, Raman, and TGA; evaluate printability, swelling, degradation, and compressive modulus of extruded scaffolds; and assess hTERT-HM myometrial cell viability and proliferation on cast hydrogels. The paper claims the selected protocol removes cells while preserving ECM and that 3% alginate + 1.5% dUECM has suitable printability and supports cell viability and proliferation (258.14 ± 12.83% at day 7).

Significance. If the claims held, the paper would offer a practically useful streamlined decellularization protocol and a promising hybrid bioink for uterine tissue engineering. Strengths include the breadth of orthogonal characterization (DNA, GAG, histology, SEM, FTIR, Raman, TGA, mechanical testing), the direct quantitative measurements underlying the main conclusions, and the first reported use of the hTERT-HM line on an alginate/dUECM hydrogel. The study is not circular: conclusions rest on measured outcomes. However, the central decellularization claim is internally inconsistent with the paper's own DNA data, the printability metric is not a fidelity measure as interpreted, and the cell data were collected on cast gels rather than on the printed constructs that the abstract emphasizes. These issues are load-bearing for the main claims.

major comments (3)
  1. [Section 3.1, Section 3.7, Section 4] The selected protocol (1% Triton X-100 + 1% SDS, 48 h) has a reported residual DNA content of 51.33 ± 9.02 ng/mg dry weight, which is above the 50 ng/mg threshold the paper itself cites as the accepted criterion for minimal immunogenicity. Section 3.1 states that 'all treatments with SDS concentrations of 1% or higher reduced DNA levels below the commonly accepted threshold of 50 ng/mg,' Section 3.7 states that this protocol achieved 'levels below the critical threshold of 50 ng/mg,' and Section 4 repeats that the protocol reduced DNA 'below 50 ng/mg.' These statements contradict the reported value. Because every downstream hydrogel and cell experiment uses dUECM from this 48 h protocol, residual cellular material could confound the attribution of bioactivity to dUECM. The authors must either correct the threshold claim, justify a different criterion, or repeat the hydrogel and cell experiments with a protocol that actually meets the stated threshold.
  2. [Eq. 1 and Section 3.9] The 'strand printability' factor defined in Eq. 1 simplifies algebraically to de/dt, the ratio of extruded strand diameter to designed strand diameter. Values near 1 indicate fidelity, while values around 1.5 indicate substantial strand swelling, not high printing fidelity as the text implies. In the 3% alginate group, 3% Alg + 1% dUECM has a printability factor of 1.20 ± 0.19, closer to 1 than the selected 3% Alg + 1.5% dUECM (1.56 ± 0.20); the claim that the latter has 'balanced printability' is therefore not supported by the reported metric. The authors should report de/dt directly, define an acceptable printability window, and justify the composition choice with a fidelity measure that accounts for strand spreading.
  3. [Section 2.6 vs. Abstract and Section 3.9] Cell viability, proliferation, and Live/Dead imaging were performed on cast Alg:dUECM hydrogels (Section 2.6), not on 3D-printed scaffolds. The printed constructs characterized in Section 3.9 were never seeded with cells. The abstract claims the study aimed 'to fabricate 3D-printed constructs to support human uterine myometrial cell growth in vitro,' but no experimental data connect the printed scaffold architecture to cell response. This is a central translational claim. The authors should either seed and evaluate cells on printed scaffolds or substantially temper the conclusions to state that cell compatibility was demonstrated only on cast hydrogels.
minor comments (4)
  1. [Section 2.7.1 and Section 3.4] There is an inconsistency in treatment durations: Section 2.1 describes 48 and 72 h decellularization, Section 2.7.1 says tensile tests used '24 and 48 hours,' and Section 3.4 includes 24 h groups in Raman analysis (e.g., 'T1% + S1% – 24h'). Please reconcile the methods and results.
  2. [Figure 4 caption] The Figure 4 caption contains a duplicated sentence about GAG content; please remove the repetition.
  3. [Figure 15 caption] The caption refers to 'SA 2%:dUECM 0.5, 1 and 1.5%' in panels A1/A2, while the text uses 'Alg' nomenclature; please standardize the notation throughout.
  4. [Section 3.10] The MTT results are expressed as percentages relative to a positive control that itself grows over time (e.g., 199.30 ± 16.88% at day 7). The meaning of 'relative cell survival' percentages above 100% should be clarified in the methods or results to avoid confusion.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: all central claims rest on fresh measurements; the DNA-threshold inconsistency is a correctness issue, not a self-referential derivation.

full rationale

The paper's derivation chain is experimental. The decellularization claim is supported by directly measured DNA, GAG, histology, FTIR, Raman, and TGA data; the alginate-dUECM hydrogel claims are supported by direct printability, swelling, degradation, mechanical, and MTT/Live-Dead measurements. No equation in the paper defines an output in terms of the claimed conclusion, and no fitted parameter is relabeled as a prediction. The authors' prior decellularization paper (refs 5/9) is cited for background and for the dose-dependence of SDS effects, but the present study generates its own comparative protocol data, so the citation is not load-bearing. The notable internal problem is in Sections 3.1/3.7: Triton 1% + SDS 1% at 48 h is reported as 51.33 ± 9.02 ng/mg dry weight, above the 50 ng/mg threshold the paper itself cites, yet Section 3.7 states this protocol 'achieving levels below the critical threshold of 50 ng/mg' and Section 4 states DNA was reduced 'below 50 ng/mg dry weight.' That inconsistency weakens the decellularization conclusion and could propagate into downstream hydrogel results, but it is a correctness/consistency flaw, not a circularity: the value is measured, not derived from the criterion. Likewise, the cell experiments were performed on cast, not printed, hydrogels, which is a translational gap rather than a self-referential reduction. No basis exists for scoring circularity above zero.

Assumptions & free parameters 0 free parameters · 5 assumptions · 0 invented entities

The central claim rests on standard biomaterials assumptions: the 50 ng/mg DNA threshold, the use of an immortalized cell line as a myometrial proxy, spectral markers for collagen integrity, and a paper-specific printability metric. No new physical entities are postulated.

assumptions (5)
  • domain assumption DNA content below 50 ng/mg dry weight is a valid threshold for avoiding immunogenicity.
    Invoked in Sections 3.1 and 3.7 to judge decellularization success; the threshold is used as a hard cutoff without independent validation for uterine tissue.
  • domain assumption hTERT-HM cells are a representative model for primary human uterine myometrial cells.
    Used in Section 2.6/3.10 for biocompatibility testing; the cell line is an immortalized surrogate and the paper does not validate contractile phenotype or primary cell comparison.
  • domain assumption FTIR Amide III/1450 ratio near 1 indicates intact collagen triple helix.
    Used in Section 3.3 to infer ECM preservation from spectra; the ratio threshold is borrowed from collagen literature without calibration in this system.
  • domain assumption Alginate is bioinert and lacks cell-adhesion motifs, so improved cell responses are attributable to dUECM.
    The discussion (Section 4) interprets MTT differences as dUECM bioactivity; the paper does not control for differences in stiffness, porosity, or protein adsorption between groups.
  • ad hoc to paper The printability factor of Eq. 1 (de/dt) is a valid measure of printing fidelity.
    This paper-specific definition treats values closer to 1 as better, but all measured values exceed 1.5, indicating strand swelling. The metric conflates swelling with printing accuracy.

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Cite this review

Pith. "Pith review of One-step decellularization of porcine uterine tissue for developing alginate-decellularized uterine ECM hydrogel for uterine tissue engineering." pith.science (2026). https://pith.science/paper/WFF5B465

@misc{pith2026250615857,
  author       = {Pith},
  title        = {Pith review of: One-step decellularization of porcine uterine tissue for developing alginate-decellularized uterine ECM hydrogel for uterine tissue engineering},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/WFF5B465}},
  note         = {Machine review of arXiv:2506.15857}
}
read the original abstract

Decellularized uterine extracellular matrix (dUECM) is promising for uterine tissue engineering because of its inherent bioactivity and structural complexity. However, transforming dUECM into porous, functional 3D constructs remains challenging. This study aimed to (1) synthesize dUECM using a modified decellularization protocol and formulate it into a hydrogel ink, and (2) fabricate 3D-printed constructs to support human uterine myometrial cell growth in vitro. Porcine uterine tissues were decellularized using 1% Triton X-100 with varying concentrations of sodium dodecyl sulfate (SDS) (0.1-1.5%) for 48-72 h. The resulting dUECM was characterized using DNA and glycosaminoglycan (GAG) quantification, Picrosirius Red-polarized light microscopy, histology, scanning electron microscopy, FTIR, Raman spectroscopy, and thermogravimetric analysis. To prepare the ink, dUECM powder was enzymatically digested with pepsin and blended with 2% and 3% alginate. Constructs were fabricated using extrusion-based 3D printing and assessed for filament fidelity, swelling, degradation, and mechanical properties. Biocompatibility was evaluated using hTERT-HM myometrial cells through MTT assays, Live/Dead staining, and alpha-SMA immunohistochemistry. The optimal protocol (1% Triton X-100 + 1% SDS for 48 h) reduced DNA to 51.3 +/- 9 ng/mg while retaining high GAGs (54.9 +/- 7.6 ug/mg). Preservation of the ECM structure was confirmed by spectroscopy. The 3% Alg + 1.5% dUECM hydrogel exhibited suitable printability (1.5 +/- 0.2), swelling (47 +/- 12%), degradation resistance (94 +/- 18% mass retention), and mechanical strength (323 to 175 kPa over 14 days), with high viability and proliferation (258 +/- 13%). The developed dUECM-based hydrogel supports 3D bioprinting with strong mechanical and biological performance, offering a promising platform for uterine tissue engineering.

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Pith tools

Reviewed August 15, 2026 · model on record in the stance chip above.