{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,13]],"date-time":"2026-05-13T07:16:28Z","timestamp":1778656588275,"version":"3.51.4"},"reference-count":40,"publisher":"American Society of Hematology","issue":"20","content-domain":{"domain":["ashpublications.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2021,10,26]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Bone marrow (BM) is the primary site of hematopoiesis and is responsible for a lifelong supply of all blood cell lineages. The process of hematopoiesis follows key intrinsic programs that also integrate instructive signals from the BM niche. First identified as an erythropoietin-potentiating factor, the tissue inhibitor of metalloproteinase (TIMP) protein family has expanded to 4 members and has widely come to be viewed as a classical regulator of tissue homeostasis. By virtue of metalloprotease inhibition, TIMPs not only regulate extracellular matrix turnover but also control growth factor bioavailability. The 4 mammalian TIMPs possess overlapping enzyme-inhibition profiles and have never been studied for their cumulative role in hematopoiesis. Here, we show that TIMPs are critical for postnatal B lymphopoiesis in the BM. TIMP-deficient mice have defective B-cell development arising at the pro-B-cell stage. Expression analysis of TIMPless hematopoietic cell subsets pointed to an altered B-cell program in the Lineage\u2212Sca-1+c-Kit+ (LSK) cell fraction. Serial and competitive BM transplants identified a defect in TIMP-deficient hematopoietic stem and progenitor cells for B lymphopoiesis. In parallel, reverse BM transplants uncovered the extrinsic role of stromal TIMPs in pro- and pre-B-cell development. TIMP deficiency disrupted CXCL12 localization to LepR+ cells, and increased soluble CXCL12 within the BM niche. It also compromised the number and morphology of LepR+ cells. These data provide new evidence that TIMPs control the cellular and biochemical makeup of the BM niche and influence the LSK transcriptional program required for optimal B lymphopoiesis.<\/jats:p>","DOI":"10.1182\/bloodadvances.2020004101","type":"journal-article","created":{"date-parts":[[2021,9,9]],"date-time":"2021-09-09T21:45:00Z","timestamp":1631223900000},"page":"3960-3974","update-policy":"https:\/\/doi.org\/10.1182\/blood.2019cm0000","source":"Crossref","is-referenced-by-count":4,"title":["Abnormal B-cell development in TIMP-deficient bone marrow"],"prefix":"10.1182","volume":"5","author":[{"given":"Ashley","family":"Weiss","sequence":"first","affiliation":[{"name":"Princess Margaret Cancer Centre\/University Health Network, Toronto, ON, Canada;"},{"name":"Department of Laboratory Medicine and Pathobiology; and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6028-1524","authenticated-orcid":false,"given":"Sanjay","family":"Saw","sequence":"additional","affiliation":[{"name":"Princess Margaret Cancer Centre\/University Health Network, Toronto, ON, Canada;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alison","family":"Aiken","sequence":"additional","affiliation":[{"name":"Princess Margaret Cancer Centre\/University Health Network, Toronto, ON, Canada;"},{"name":"Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kazeera","family":"Aliar","sequence":"additional","affiliation":[{"name":"Princess Margaret Cancer Centre\/University Health Network, Toronto, ON, Canada;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yang W.","family":"Shao","sequence":"additional","affiliation":[{"name":"Princess Margaret Cancer 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