Our technology: IMM01-STEM

Immunis is conducting clinically advanced research of stem cell-derived multi-active secretomes. Unlike traditional single-molecule, single-target drugs, secretomes harness a variety of factors that can engage multiple biological pathways simultaneously, including those of the immune system.

Most diseases arise from dysregulation of complex cellular signaling pathways that are too intricate to correct with a single agent. By designing a multi-active therapeutic like IMM01-STEM, it is possible to more effectively address the underlying cellular intricacies that drive disease.

Developing IMM01-STEM

Immunis developed a novel method of growing human cells for clinical use and directing them to become highly pure populations of defined cells that secrete hundreds of all-natural factors. Our technology captures this powerful secretome to produce an investigational therapy called IMM01-STEM.

IMM01-STEM is produced following Good Manufacturing Practices (GMP) using human stem cells that are grown in a proprietary cell culture media and partially differentiated. These cells secrete factors and molecules into the media, called the secretome. The secretome is then harvested and processed to ensure standard concentration, composition and potency. IMM01-STEM is the cell-free, multi-active secretome that is used for clinical testing.

Therapeutic potential and efficacy studies

IMM01-STEM represents the balanced set of factors that typically diminish with age. Our therapeutic has the potential to eliminate the effects of age and immune-related diseases by replenishing these critical components that maintain optimal cell and immune responses.

IMM01-STEM's broad repertoire of regenerative factors could have broad therapeutic benefits in several age-related conditions. Based Immunis' preclinical data published in three peer-reviewed scientific journals, IMM01-STEM may positively impact people experiencing muscle loss and metabolic dysfunction.

“Reversal of deficits in aged skeletal muscle during disuse and recovery in response to treatment with a secretome product derived from partially differentiated human pluripotent stem cells” (Fix et al., 2021).

The first publication in GeroScience investigates treatment with IMM01-STEM in aged mouse models of disuse atrophy. Compared to control mice, IMM01-STEM treatment increases muscle mass and size, and improves grip strength. Additionally, IMM01-STEM increases collagen turnover and the number of muscle stem cells, indicative of enhanced muscle remodeling. These findings demonstrate that IMM01-STEM promotes muscle size and strength following disuse atrophy.

Phase 1/2a Clinical Trial: An open-label dose escalation study to assess the safety and tolerability of IMM01-STEM in participants with muscle atrophy related to knee osteoarthritis

Immunis is completing a Phase 1/2a clinical trial examining the safety, tolerability and preliminary efficacy of IMM01-STEM treatment in sarcopenic elderly with knee osteoarthritis. There have been no reports of serious adverse events (SAEs) associated with our IMM01-STEM treatment in humans. Initial analyses show striking improvements in quality-of-life measurements related to pain, stiff, and physical function. In the 6-min walk test, the patients increased their walking distance and achieved a clinically meaningful improvement in gait speed, an encouraging suggested functional efficacy signal. The team is preparing a manuscript detailing the full results of the investigation.

“Stem cell secretome treatment improves whole-body metabolism, reduces adiposity, and promotes skeletal muscle function in aged mice” (Fennel et al., 2024).

Age-related loss of muscle mass and function (sarcopenia) associated with excess body fat, referred to as “sarcopenic obesity,” is a global health concern (Donini et al., 2022). There are no interventions to combat weight gain without compromising muscle mass, creating an unmet clinical need. Immunis’ Aging Cell publication investigates the therapeutic impact of IMM01-STEM on muscle and metabolism in aged mice. Compared to control-treated mice, IMM01-STEM increases whole-body lean mass, reduces fat mass and decreases muscle fat. Additionally, there is an increase in muscle fiber area and the number of muscle stem cells, as well as enhanced collagen turnover. Lastly, IMM01-STEM promoted better grip strength and increased overall physical activity.

For additional information, please see the publication below.

Donini, L. M., Busetto, L., Bischoff, S. C., Cederholm, T., Ballesteros-Pomar, M. D., Batsis, J. A., Bauer, J. M., Boirie, Y., Cruz-Jentoft, A. J., Dicker, D., Frara, S., Frühbeck, G., Genton, L., Gepner, Y., Giustina, A., Gonzalez, M. C., Han, H.-S., Heymsfield, S. B., Higashiguchi, T., … Barazzoni, R. (2022). Definition and Diagnostic Criteria for Sarcopenic Obesity: ESPEN and EASO Consensus Statement. Obesity Facts, 15(3), 321–335. https://doi.org/10.1159/000521241 

"Stem Cell Secretome Treatment Reduces Adiposity and Improves Glucose Handling During Obesity and Weight Loss in Mice" (Fennel et al., 2025). 

Immunis’ publication in Obesity discusses the effects of its investigational therapeutic, IMM01-STEM, in mouse models of obesity. The key findings are as follows:

  • 1. IMM01-STEM significantly enhanced weight loss in obese mice by reducing the percentage of whole-body fat while increasing lean mass.

  • 2. IMM01-STEM significantly reversed liver steatosis and fibrosis in aged mice on a high fat diet, to levels similar to that of healthy controls.

  • 3. IMM01-STEM provided major metabolic benefits during weight loss, including better glucose tolerance and lower fasting insulin levels, with treated mice achieving metabolic profiles similar to healthy controls.

  • 4. IMM01-STEM preserves muscle mass and enhances muscle quality by increasing muscle fiber size, increasing blood capillary density, and reducing fibrosis.

These data provide a promising basis for additional investigations of IMM01-STEM in supporting metabolic and tissue health during obesity and weight loss in humans. This research compliments the findings from Immunis’ two additional published preclinical studies in GeroScience and Aging Cell, which show a reversal of deficits in aged skeletal muscle resulting in leaner, higher quality tissue with lower fat and fibrosis, thicker myofibers, greater overall strength, improved whole-body metabolism, reduced adiposity, and better balance and coordination.

For additional information, please see the publication below.

Donini, L. M., Busetto, L., Bischoff, S. C., Cederholm, T., Ballesteros-Pomar, M. D., Batsis, J. A., Bauer, J. M., Boirie, Y., Cruz-Jentoft, A. J., Dicker, D., Frara, S., Frühbeck, G., Genton, L., Gepner, Y., Giustina, A., Gonzalez, M. C., Han, H.-S., Heymsfield, S. B., Higashiguchi, T., … Barazzoni, R. (2022). Definition and Diagnostic Criteria for Sarcopenic Obesity: ESPEN and EASO Consensus Statement. Obesity Facts, 15(3), 321–335. https://doi.org/10.1159/000521241 

Mechanism of Action

Immunis' published preclinical data demonstrate that intramuscular administration of IMM01-STEM increases muscle strength, muscle mass, and improves metabolism in aged mice. Additionally, IMM01-STEM increases the number of muscle stem cells and improves macrophage infiltration in mice treated with IMM01-STEM, suggesting that tissue remodeling and regeneration are core components of the mechanism of action.