Aug 2026· Cells· Vol 15· 0 citations· 132 references
Medicine
TL;DR
Development of safe-harbor integration and B2M/CIITA-based hypoimmunogenic designs as strategies to reduce engineering-related batch variability and HLA-dependent donor variability support a transition from empirical optimized MSC preparations toward molecularly defined cellular medicines with predefined genotype, expression, potency, and safety attributes.
Abstract
Mesenchymal stromal cells (MSCs) are a versatile platform for regenerative medicine and gene delivery because they combine multipotency, immunoregulatory activity, and injury-directed trafficking. Translation is nevertheless limited by donor- and tissue-dependent heterogeneity, variable biodistribution, and engineering-related risks. This review evaluates genetically modified MSCs as medicinal products rather than as a general MSC class. We compare self-inactivating lentiviral (SIN-LV) transduction, which provides efficient and durable expression and has limited early clinical experience, with targeted genome editing, which can define the integration locus and copy number but remains constrained by variable precise knock-in efficiency, off-target and double-strand-break-associated effects, manufacturing cost, and the absence of long-term clinical safety data. We integrate preclinical and clinical evidence with GMP-compatible manufacturing, potency testing, genomic surveillance, and release criteria. Particular attention is given to safe-harbor integration and B2M/CIITA-based hypoimmunogenic designs as strategies to reduce engineering-related batch variability and HLA-dependent donor variability. Together, these developments support a transition from empirically optimized MSC preparations toward molecularly defined cellular medicines with predefined genotype, expression, potency, and safety attributes.
Highlights What are the main findings? In various clinical trials, largely unmodified mesenchymal stem cell (MSC) therapies have shown limited and inconsistent benefits, highlighting the need for a shift toward MSC products engineered to target specific mechanisms and diseases. Targeted engineering, such as genetic modification, hematopoietic cell E-/L-selectin ligand (HCELL)/CD44 and E-selectin glycoengineering, hypoxic/cytokine preconditioning, biomaterial scaffolding, and MSC-derived extracellular vesicles, may address core limitations of unmodified MSCs by improving homing, persistence, immunomodulation, and resistance to senescence in preclinical models, which may in turn contribute to healthspan-relevant outcomes. What are the implications of the main findings? Disease-matched and combinatorial engineering could establish MSCs as a flexible therapeutic platform for treating age-related diseases and potentially improving healthspan-related outcomes rather than lifespan alone. Clinical translation will depend on standardized manufacturing, validated potency and senescence resistance assays, long-term monitoring of tumorigenicity, and regulatory frameworks suited to aged recipients. Abstract Engineered mesenchymal stem cells (MSCs) have emerged as promising therapeutic platforms for healthspan-relevant applications. As agents of tissue repair and modulators of biological aging, MSCs have been widely studied for their capacity to enhance regeneration, restore immune homeostasis, and reduce chronic inflammation associated with age-related decline. This review examines emerging bioengineering strategies designed to overcome key age-related limitations in MSC homing, survival, and paracrine signaling, which have historically constrained their in vivo efficacy. We discuss major engineering approaches, including genetic modification, surface engineering, metabolic reprogramming, and preconditioning, with particular attention to their contributions to longevity-focused applications. Preclinical studies have demonstrated that engineered MSCs and their extracellular vesicles (EVs) yield measurable improvements in therapeutic performance. Reported benefits include prolonged persistence in inflamed tissues, partial reversal of senescence-associated phenotypes, and modulation of pro-aging inflammatory pathways. While MSC-derived EVs may offer potential safety advantages and could reduce certain risks associated with live-cell administration, this remains to be confirmed in well-controlled clinical studies, and significant challenges persist in terms of manufacturing scalability, cargo consistency, and process standardization. The current literature, which is predominantly preclinical, supports the potential of engineered MSC platforms to improve healthspan-relevant outcomes; direct evidence of healthspan extension in humans is not yet available. However, successful clinical translation will require a standardized manufacturing process to ensure therapeutic safety, reproducibility, and efficacy in age-related conditions.
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Mesenchymal stem cells (MSCs) are widely investigated for regenerative medicine, tissue repair, immunomodulation, and selected cancer-related applications because of their multilineage differentiation potential, paracrine activity, immunoregulatory properties, and capacity to home to sites of injury. However, the therapeutic potential of MSCs depends not only on their tissue source or surface-marker expression but also on their functional state. MSC senescence is not a single phenotypic alteration; rather, it reflects the combined effects of persistent DNA damage response activation, disruption of mitochondrial and metabolic homeostasis, remodeling of epigenetic and secretory networks, and loss of proteostasis. Collectively, these changes drive MSCs toward reduced proliferative capacity, dysregulated paracrine signaling, impaired immunomodulatory activity, and diminished tissue-repair potential, thereby compromising cell-product potency and batch-to-batch consistency. This review summarizes the molecular mechanisms underlying MSC senescence, its source-specific functional consequences, and emerging rejuvenation strategies, with an emphasis on MSC quality control, potency assessment, and clinical translation.
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