{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T21:13:19Z","timestamp":1790802799766,"version":"4.1.0"},"update-to":[{"DOI":"10.1371\/journal.pcbi.1011223","type":"new_version","label":"New version","source":"publisher","updated":{"date-parts":[[2023,12,27]],"date-time":"2023-12-27T00:00:00Z","timestamp":1703635200000}}],"reference-count":113,"publisher":"Public Library of Science (PLoS)","issue":"12","license":[{"start":{"date-parts":[[2023,12,13]],"date-time":"2023-12-13T00:00:00Z","timestamp":1702425600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000050","name":"National Heart, Lung, and Blood Institute","doi-asserted-by":"publisher","award":["R01HL154150"],"award-info":[{"award-number":["R01HL154150"]}],"id":[{"id":"10.13039\/100000050","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["www.ploscompbiol.org"],"crossmark-restriction":false},"short-container-title":["PLoS Comput Biol"],"abstract":"<jats:p>Being the largest lymphatic organ in the body, the spleen also constantly controls the quality of red blood cells (RBCs) in circulation through its two major filtration components, namely interendothelial slits (IES) and red pulp macrophages. In contrast to the extensive studies in understanding the filtration function of IES, fewer works investigate how the splenic macrophages retain the aged and diseased RBCs, i.e., RBCs in sickle cell disease (SCD). Herein, we perform a computational study informed by companion experiments to quantify the dynamics of RBCs captured and retained by the macrophages. We first calibrate the parameters in the computational model based on microfluidic experimental measurements for sickle RBCs under normoxia and hypoxia, as those parameters are not available in the literature. Next, we quantify the impact of key factors expected to dictate the RBC retention by the macrophages in the spleen, namely, blood flow conditions, RBC aggregation, hematocrit, RBC morphology, and oxygen levels. Our simulation results show that hypoxic conditions could enhance the adhesion between the sickle RBCs and macrophages. This, in turn, increases the retention of RBCs by as much as four-fold, which could be a possible cause of RBC congestion in the spleen of patients with SCD. Our study on the impact of RBC aggregation illustrates a \u2018clustering effect\u2019, where multiple RBCs in one aggregate can make contact and adhere to the macrophages, leading to a higher retention rate than that resulting from RBC-macrophage pair interactions. Our simulations of sickle RBCs flowing past macrophages for a range of blood flow velocities indicate that the increased blood velocity could quickly attenuate the function of the red pulp macrophages on detaining aged or diseased RBCs, thereby providing a possible rationale for the slow blood flow in the open circulation of the spleen. Furthermore, we quantify the impact of RBC morphology on their tendency to be retained by the macrophages. We find that the sickle and granular-shaped RBCs are more likely to be filtered by macrophages in the spleen. This finding is consistent with the observation of low percentages of these two forms of sickle RBCs in the blood smear of SCD patients. Taken together, our experimental and simulation results aid in our quantitative understanding of the function of splenic macrophages in retaining the diseased RBCs and provide an opportunity to combine such knowledge with the current knowledge of the interaction between IES and traversing RBCs to apprehend the complete filtration function of the spleen in SCD.<\/jats:p>","DOI":"10.1371\/journal.pcbi.1011223","type":"journal-article","created":{"date-parts":[[2023,12,13]],"date-time":"2023-12-13T13:38:38Z","timestamp":1702474718000},"page":"e1011223","update-policy":"https:\/\/doi.org\/10.1371\/journal.pcbi.corrections_policy","source":"Crossref","is-referenced-by-count":12,"title":["A combined computational and experimental investigation of the filtration function of splenic macrophages in sickle cell disease"],"prefix":"10.1371","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3982-0562","authenticated-orcid":true,"given":"Guansheng","family":"Li","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuhao","family":"Qiang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"He","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xuejin","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pierre A.","family":"Buffet","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ming","family":"Dao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9713-7120","authenticated-orcid":true,"given":"George Em","family":"Karniadakis","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2023,12,13]]},"reference":[{"key":"pcbi.1011223.ref001","doi-asserted-by":"crossref","first-page":"31","DOI":"10.1016\/S0074-7696(08)62453-5","article-title":"Cells in the marginal zone of the spleen","volume":"132","author":"G Kraal","year":"1992","journal-title":"International Review of Cytology"},{"key":"pcbi.1011223.ref002","doi-asserted-by":"crossref","first-page":"606","DOI":"10.1038\/nri1669","article-title":"Structure and function of the spleen","volume":"5","author":"RE Mebius","year":"2005","journal-title":"Nature Reviews Immunology"},{"key":"pcbi.1011223.ref003","doi-asserted-by":"crossref","first-page":"e1009516","DOI":"10.1371\/journal.pcbi.1009516","article-title":"How the spleen reshapes and retains young and old red blood cells: A computational investigation","volume":"17","author":"H Li","year":"2021","journal-title":"PLoS Computational Biology"},{"key":"pcbi.1011223.ref004","doi-asserted-by":"crossref","first-page":"269","DOI":"10.1016\/0026-2862(87)90061-6","article-title":"Microcirculation of the spleen: new concepts, new challenges","volume":"34","author":"AC Groom","year":"1987","journal-title":"Microvascular. 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