Towards Replacement of the Aged Hematopoietic Stem Cell Population

Ultimately, the treatment of aging as a medical condition must include ways to either repair or replace damaged stem cell populations. This is a monumental task, given the sizable number of distinct types of stem cell in the body, but there is progress towards replacement via cell therapy in the case of a few of the better studied and characterized stem cell populations. Arguably the most advanced of this work is focused on replacement of hematopoietic stem cells, the stem cell population responsible for generating blood and immune cells. This is fortunate, as the decline of these stem cells has a profound detrimental effect on the immune system, and the age-related decline of immune function is an important contribution to the frailty of older individuals. Improving hematopoietic function in older individuals is one of the necessary steps that must be taken to reverse immunosenescence. Transplantation of hematopoietic stem cells, in the form of bone marrow transplantation, has been an ongoing concern for decades, and there has consequently been a great deal of research into the biochemistry of these stem cells, as well as how to move towards therapies that deliver just hematopoietic stem cells rather than tissue. It is now possible to produce patient matched stem cells using reprogramming techniques, potentially eliminating many of the serious issues of rejection and autoimmunity that make hematopoietic stem cell transplant as presently practiced a procedure with sign...
Source: Fight Aging! - Category: Research Authors: Tags: Medicine, Biotech, Research Source Type: blogs

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This is the latest in a series of yearly posts in which I suggest areas of development for biotech startups I'd like to see actively developed as a part of the longevity industry in the near future. Today, this year, is a good time to be starting a company focused on the production of a novel therapeutic approach to intervening in the aging process. There is a great deal of funding for seed stage investment, and many compelling projects lacking champions, yet to be carried forward from academia into preclinical development. Numerous scientific and industry crossover conferences are now held every year, at which it is possi...
Source: Fight Aging! - Category: Research Authors: Tags: Investment Source Type: blogs
Researchers here report that transplanting bone marrow from young donor mice into old recipient mice produces a range of benefits, such as improvement in the behavior of macrophage cells. Bone marrow stem cells are responsible for producing blood and immune cells, among other important populations, and this capability is degraded in a number of ways with age. Introducing younger stem cells and their supporting structures is a plausible means to at least partially reverse this process. That said, this sort of approach is unlikely to arrive in human medicine in exactly the same form, given the challenges involved in bone mar...
Source: Fight Aging! - Category: Research Authors: Tags: Daily News Source Type: blogs
Publication date: 21 January 2020Source: Cell Reports, Volume 30, Issue 3Author(s): Carmit Hillel-Karniel, Chava Rosen, Irit Milman-Krentsis, Ran Orgad, Esther Bachar-Lustig, Elias Shezen, Yair ReisnerSummaryInduction of lung regeneration by transplantation of lung progenitor cells is a critical preclinical challenge. Recently, we demonstrated that robust lung regeneration can be achieved if the endogenous stem cell niches in the recipient’s lung are vacated by sub-lethal pre-conditioning. However, overcoming MHC barriers is an additional requirement for clinical application of this attractive approach. We demonstrat...
Source: Cell Reports - Category: Cytology Source Type: research
In this study, we investigated the link between AF and senescence markers through the assessment of protein expression in the tissue lysates of human appendages from patients in AF, including paroxysmal (PAF) or permanent AF (PmAF), and in sinus rhythm (SR). The major findings of the study indicated that the progression of AF is strongly related to the human atrial senescence burden as determined by p53 and p16 expression. The stepwise increase of senescence (p53, p16), prothrombotic (TF), and proremodeling (MMP-9) markers observed in the right atrial appendages of patients in SR, PAF, and PmAF points toward multiple inter...
Source: Fight Aging! - Category: Research Authors: Tags: Newsletters Source Type: blogs
Abstract Adult stem cells have a major role in endometrial physiology, including remodelling and repair. However, they also have a critical role in the development and progression of endometriosis. Bone marrow-derived stem cells engraft eutopic endometrium and endometriotic lesions, differentiating to both stromal and epithelial cell fates. Using a mouse bone marrow transplantation model, we show that bone marrow-derived cells engrafting endometriosis express CXCR4 and CXCR7. Targeting either receptor by the administration of small molecule receptor antagonists AMD3100 or CCX771, respectively, reduced BM-derived s...
Source: J Cell Mol Med - Category: Molecular Biology Authors: Tags: J Cell Mol Med Source Type: research
CONCLUSIONS: These data demonstrate that severe sepsis induces stable mixed-lineage leukemia 1-mediated epigenetic modifications in the bone marrow, which are passed to peripheral macrophages resulting in impaired macrophage function and deficient wound healing persisting long after sepsis recovery. PMID: 31644352 [PubMed - in process]
Source: Arteriosclerosis, Thrombosis and Vascular Biology - Category: Cardiology Authors: Tags: Arterioscler Thromb Vasc Biol Source Type: research
Publication date: Available online 19 September 2019Source: Stem Cell ReportsAuthor(s): Denise Klatt, Erica Cheng, Friederike Philipp, Anton Selich, Julia Dahlke, Reinhold E. Schmidt, Juliane W. Schott, Hildegard Büning, Dirk Hoffmann, Adrian J. Thrasher, Axel SchambachSummaryMutations in the NADPH oxidase, which is crucial for the respiratory burst in phagocytes, result in chronic granulomatous disease (CGD). The only curative treatment option for CGD patients, who suffer from severe infections, is allogeneic bone marrow transplantation. Over 90% of patients with mutations in the p47phox subunit of the oxidase comple...
Source: Stem Cell Reports - Category: Stem Cells Source Type: research
A Midwestern grocery chain, Hy-Vee, is taking an unusual—and highly controversial—approach to reducing health care costs. Before employees in certain cities can undergo knee replacement, they first must visit a stem cell provider. Hy-Vee has contracted with one of the U.S.’ leading stem cell companies—Regenexx, based in Des Moines, Iowa—that claims injections of concentrated bone marrow or platelets can help patients avoid expensive joint surgery. Regenexx has persuaded over 100 employers to include its services in their health insurance plans. In a marketing booklet, Regenexx, whose injection...
Source: TIME: Health - Category: Consumer Health News Authors: Tags: Uncategorized Healthcare medicine Source Type: news
Fight Aging! provides a weekly digest of news and commentary for thousands of subscribers interested in the latest longevity science: progress towards the medical control of aging in order to prevent age-related frailty, suffering, and disease, as well as improvements in the present understanding of what works and what doesn't work when it comes to extending healthy life. Expect to see summaries of recent advances in medical research, news from the scientific community, advocacy and fundraising initiatives to help speed work on the repair and reversal of aging, links to online resources, and much more. This content is...
Source: Fight Aging! - Category: Research Authors: Tags: Newsletters Source Type: blogs
In this study, a significant (30%) increase in maximum lifespan of mice was found after nonablative transplantation of 100 million nucleated bone marrow (BM) cells from young donors, initiated at the age that is equivalent to 75 years for humans. Moreover, rejuvenation was accompanied by a high degree of BM chimerism for the nonablative approach. Six months after the transplantation, 28% of recipients' BM cells were of donor origin. The relatively high chimerism efficiency that we found is most likely due to the advanced age of our recipients having a depleted BM pool. In addition to the higher incorporation rates, ...
Source: Fight Aging! - Category: Research Authors: Tags: Newsletters Source Type: blogs
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