{"id":"5cf0281a-3a91-40bc-bda5-e4b944bc666f","arxiv_id":"2506.15857","paper_version":2,"verdict":"CONDITIONAL","confidence":"LOW","novelty_score":5.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":0,"one_line_summary":"A one-step Triton X-100 plus SDS decellularization of porcine uterus yields a matrix that, blended with 3% alginate, forms a bioprintable hydrogel supporting human myometrial cell proliferation.","lead":"This paper develops a one-step chemical method to strip cells from pig uterus tissue and mixes the leftover matrix with alginate to make a 3D-printable gel. The gel kept its shape, held up for two weeks, and supported growth of human uterine muscle cells in lab dishes.","discovery_kind":"new_application","skeptic_critique":{"model":"deepseek-v4-flash","headline":"Selected 48 h dUECM protocol has residual DNA 51.33 ng/mg, above the 50 ng/mg threshold the paper itself cites, yet Section 3.7 treats it as below; the decellularization claim is internally inconsistent.","rationale":"The paper's central claim has two linked parts: effective decellularization and a printable, cell-supportive Alg:dUECM hydrogel. I focused on the decellularization part because it is the foundation for everything downstream, and because the manuscript contradicts itself numerically. The selected T1%+S1%-48h protocol shows 51.33 ± 9.02 ng/mg residual DNA, while the same section claims SDS ≥ 1% treatments fall below 50 ng/mg, and Section 3.7 repeats that the chosen protocol is below threshold. The abstract downgrades this to 'nearing,' which is honest but shows the conclusion overstates the result. If the dUECM is not validated as decellularized, the biological performance of the hydrogel cannot be cleanly attributed to ECM bioactivity. This concern is addressable: the 72 h protocol already achieves 24 ± 7.21 ng/mg, so the paper could switch protocols, or it could provide evidence that 51 ng/mg is functionally non-immunogenic. Because the issue is fixable and the rest of the study is reproducible, the conditional verdict remains appropriate. I did not make the cast-versus-printed cell seeding gap the primary concern, although it is a real weakness; that gap matters only if the material itself is genuinely decellularized. Hence partial agreement with the reader: they noted the DNA threshold in the rationale, but their formal weakest assumption was the transfer of cast-gel cell data to printed scaffolds. My concrete test, PicoGreen quantification on independent biological replicates, would settle whether the chosen protocol meets the paper's own acceptance criterion.","tokens_in":38433,"tokens_out":7489,"duration_ms":76728,"concrete_test":"Re-measure residual DNA in T1%+S1%-48h and T1%+S1%-72h dUECM (n ≥ 3 independent porcine uterine donors) using a fluorometric PicoGreen assay rather than NanoDrop absorbance, and run the 2% agarose gel from Section 2.2.1 on the same samples. If the 48 h mean remains ≥ 50 ng/mg (the paper's cited Crapo criterion), the paper must either adopt the 72 h protocol (reported mean 24 ± 7.21 ng/mg) for all hydrogel studies, or supply functional immunogenicity data (e.g., macrophage or in vivo response) demonstrating that 51 ng/mg is safe.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The central chain of the paper is: one-step decellularization removes cells while preserving ECM; this dUECM, blended with alginate, is printable and supports hTERT-HM cells. The first link is the least secure and is contradicted by the paper's own numbers. For the protocol later selected as 'optimal' (1% Triton X-100 + 1% SDS, 48 h), Section 3.1 reports residual DNA of 51.33 ± 9.02 ng/mg dry weight. The paper cites 50 ng/mg as the accepted threshold for minimal immunogenicity, and Section 3.1 additionally states that all treatments with SDS ≥ 1% reduced DNA below that threshold. 51.33 is above 50. Section 3.7 then selects this protocol specifically because it 'achieved levels below the critical threshold of 50 ng/mg.' The abstract softens this to 'nearing the immunogenic threshold,' which is an accurate concession but undermines the conclusion that the protocol 'can remove cells.' Because every hydrogel and cell experiment uses dUECM from this 48 h protocol, the failure to meet the stated decellularization criterion propagates through the entire study: cell responses attributed to dUECM bioactivity could be confounded by residual cellular material. This is not a dispute about threshold preference; it is an internal inconsistency in the paper's own acceptance criterion.","agreement_with_reader":"partial"},"referee_report":{"model":"deepseek-v4-flash","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).","tokens_in":38638,"tokens_out":3702,"duration_ms":37865,"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":[{"comment":"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.","section":"Section 3.1, Section 3.7, Section 4"},{"comment":"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.","section":"Eq. 1 and Section 3.9"},{"comment":"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.","section":"Section 2.6 vs. Abstract and Section 3.9"}],"minor_comments":[{"comment":"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.","section":"Section 2.7.1 and Section 3.4"},{"comment":"The Figure 4 caption contains a duplicated sentence about GAG content; please remove the repetition.","section":"Figure 4 caption"},{"comment":"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.","section":"Figure 15 caption"},{"comment":"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.","section":"Section 3.10"}],"recommendation":"major_revision","confidential_remarks":"The DNA threshold contradiction and the cast-versus-printed gap are both central and would require additional experiments to fix: either selecting a protocol that actually meets the 50 ng/mg criterion and repeating the hydrogel/cell work, or explicitly narrowing the claims. If the authors cannot provide such data, the manuscript should not be accepted in its current form. The paper is otherwise within the journal's scope and has useful methodological content."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"First thing to know: the stress-test is right. The paper's chosen decellularization protocol (1% Triton X-100 + 1% SDS, 48 h) leaves residual DNA at 51.33 ± 9.02 ng/mg, above the 50 ng/mg threshold the paper itself cites in Section 3.1 and repeats as 'below the critical threshold' in Section 3.7. That is an internal inconsistency. The abstract's 'nearing' is accurate; the conclusion's 'effectively removed immunogenic cellular components' is an overstatement. It matters because all downstream hydrogel work uses this dUECM, so residual cellular material could contribute to the observed cell responses.\n\nWhat is genuinely new and good: the one-step simultaneous Triton/SDS decellularization is a real simplification over sequential protocols, and the 3% alginate + 1.5% dUECM formulation for uterine tissue is a new combination. The characterization is thorough — DNA, GAG, histology, SEM, FTIR, Raman, TGA, tensile and compressive mechanics, MTT, Live/Dead — and the methods are detailed enough to reproduce. There is no circular dependency; the conclusions rest on direct measurements.\n\nThe other soft spots are real but smaller. The 'printability factor' (Eq. 1) simplifies to de/dt, a strand swelling ratio. Values near 1.5 mean the printed strands are 50% wider than the 200 µm design; the paper even notes that values usually exceed one due to swelling, then still calls 1.56 'suitable printability.' That is a mislabeled metric, not a broken study. Also, cell seeding was done on cast hydrogels, not on the 3D-printed scaffolds, so the abstract's claim that the research aimed to fabricate printed constructs supporting cell growth is only partially addressed. That should be stated as a limitation or tested directly.\n\nWho is this for: people working on uterine tissue engineering or dECM hydrogel formulations. It is an incremental but useful addition, not a field-changer. The data are worth having in the literature.\n\nRecommendation: send it to peer review. The DNA overclaim, the printability metric, and the cast-versus-printed gap are all addressable in revision. The underlying experimental work is solid enough to justify referee time.","headline":"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.","tokens_in":39310,"tokens_out":2793,"would_cite":false,"duration_ms":26579,"reading_group":"maybe","serious_thinker":"yes","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"deepseek-v4-flash","headline":"A one-step decellularization protocol plus an alginate–dUECM hydrogel makes porcine uterine extracellular matrix printable and able to support human myometrial cell growth.","keywords":["decellularization","uterine tissue engineering","3D bioprinting","alginate hydrogel","extracellular matrix","myometrial cells","bioink","porcine uterus"],"falsifier":"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.","tokens_in":38157,"feed_emoji":"🧫","tokens_out":10006,"duration_ms":82840,"temperature":0.7,"pith_summary":"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.","feed_headline":"One-step wash makes printable uterine gel that supports muscle cells","feed_subtitle":"A 48-hour detergent step strips uterine cells; that ECM, mixed with alginate, prints and supports myometrial cells.","key_machinery":"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.","core_discovery":"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.","pith_inferences":["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."],"forward_implications":["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."],"supporting_citations":[{"why":"Provides the prior comparative analysis of porcine uterine decellularization that frames the baseline for the one-step protocol.","marker":"[5]"},{"why":"Establishes the decellularization criteria and DNA-removal standards against which the protocol is judged.","marker":"[15]"},{"why":"Overview of decellularization processes that supports the choice and combination of detergent treatments.","marker":"[17]"},{"why":"Reviews decellularized uterine scaffolds and documents the need to balance cell removal with ECM preservation.","marker":"[23]"},{"why":"Reports how prolonged detergent exposure degrades ECM components, motivating the shorter one-step approach.","marker":"[24]"},{"why":"Studies the printability of alginate-based bioinks, providing the printing-performance baseline for the Alg:dUECM inks.","marker":"[25]"},{"why":"Explains alginate's lack of cell-adhesion motifs, the specific gap that adding dUECM is meant to close.","marker":"[28]"},{"why":"Supplies the pepsin digestion method used to turn dUECM powder into a soluble hydrogel component.","marker":"[33]"},{"why":"Demonstrates printing tissue analogues with decellularized ECM bioink, the methodological template for Alg:dUECM printing.","marker":"[34]"},{"why":"Supplies the hTERT-HM myometrial cell line used in the viability and proliferation assays.","marker":"[36]"}],"fun_headline_variants":["One-step wash preps uterine tissue for 3D-printed gel","Detergent-only step yields printable uterine ECM hydrogel","Uterine matrix extracted in one bath prints into support gel","Single 48-hour wash produces uterine scaffold for bioprinting","One-step decellularization unlocks printable uterine bioink"],"cache_read_input_tokens":3200,"weakest_assumption_plain":"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.","fun_headline_variants_meta":{"raw":{"variants":["One-step wash preps uterine tissue for 3D-printed gel","Detergent-only step yields printable uterine ECM hydrogel","Uterine matrix extracted in one bath prints into support gel","Single 48-hour wash produces uterine scaffold for bioprinting","One-step decellularization unlocks printable uterine bioink"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.000866,"raw_usage":{"total_tokens":3928,"prompt_tokens":1296,"completion_tokens":2632,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":912,"completion_tokens_details":{"reasoning_tokens":2548}},"tokens_in":912,"tokens_out":2632,"duration_ms":17459,"temperature":1.0,"reasoning_tokens":2548,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-15T19:30:20.055461+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"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.","supporting_citations":[{"cited_title":"While dUECM offers promising bioactivity, it is not printable in its native form","cited_arxiv_id":null,"evidence_quote":"Provides the prior comparative analysis of porcine uterine decellularization that frames the baseline for the one-step protocol."},{"cited_title":"Frontiers in Bioengineering and Biotechnology, 2024","cited_arxiv_id":null,"evidence_quote":"Establishes the decellularization criteria and DNA-removal standards against which the protocol is judged."},{"cited_title":"Moser, and X","cited_arxiv_id":null,"evidence_quote":"Overview of decellularization processes that supports the choice and combination of detergent treatments."},{"cited_title":"Gilbert, and S.F","cited_arxiv_id":null,"evidence_quote":"Reviews decellularized uterine scaffolds and documents the need to balance cell removal with ECM preservation."},{"cited_title":"PloS one, 2014","cited_arxiv_id":null,"evidence_quote":"Reports how prolonged detergent exposure degrades ECM components, motivating the shorter one-step approach."},{"cited_title":"Biology of Reproduction, 2017","cited_arxiv_id":null,"evidence_quote":"Studies the printability of alginate-based bioinks, providing the printing-performance baseline for the Alg:dUECM inks."},{"cited_title":"Mohammad, and M","cited_arxiv_id":null,"evidence_quote":"Explains alginate's lack of cell-adhesion motifs, the specific gap that adding dUECM is meant to close."},{"cited_title":"Biofabrication, 2025","cited_arxiv_id":null,"evidence_quote":"Supplies the pepsin digestion method used to turn dUECM powder into a soluble hydrogel component."},{"cited_title":"Prajatelistia, and H","cited_arxiv_id":null,"evidence_quote":"Demonstrates printing tissue analogues with decellularized ECM bioink, the methodological template for Alg:dUECM printing."},{"cited_title":"Biology of reproduction, 2002","cited_arxiv_id":null,"evidence_quote":"Supplies the hTERT-HM myometrial cell line used in the viability and proliferation assays."}],"review_version":1}