# CST6-mRNA activated matrices for efficient bone regeneration

> **NIH NIH R21** · UNIVERSITY OF IOWA · 2022 · $193,125

## Abstract

Project Summary
Bone regeneration is a carefully orchestrated dynamic process that involves several key
biological players, including growth factors and cells. Bone tissue engineering aims to
provide an environment that facilitates and augments the natural bone regeneration
process. CST6 is a cysteine protease inhibitor that is highly expressed in multiple
myeloma patient samples lacking any bone lytic lesion, compared to those samples with
at least one bone lytic lesion. In vitro pilot studies show that CST6 (in the recombinant
protein form) promotes osteoblast differentiation and inhibit osteoclast differentiation.
CmRNA has the unique advantage of functioning entirely in the cytoplasm (avoiding the
need for nuclear entry) thereby, leading to a targeted transient expression of desired
proteins with immense potential to overcome the challenges that exist with protein and
DNA based approaches. Specifically, this study aims to develop a biomaterial-based
delivery system that releases cmRNA (CST6) to induce in vivo bone regeneration. Our
aims are 1) to demonstrate that nanoparticle loaded cmRNA (CST6) can efficiently
trigger osteogenic differentiation and inhibit osteoclast maturation and 2) to assess bone
regeneration efficacy of a collagen scaffold that delivers cmRNA (CST6) in unilateral
diaphyseal femoral defects in rats

## Key facts

- **NIH application ID:** 10456455
- **Project number:** 1R21DE031042-01A1
- **Recipient organization:** UNIVERSITY OF IOWA
- **Principal Investigator:** Aliasger K Salem
- **Activity code:** R21 (R01, R21, SBIR, etc.)
- **Funding institute:** NIH
- **Fiscal year:** 2022
- **Award amount:** $193,125
- **Award type:** 1
- **Project period:** 2022-03-01 → 2024-02-29

## Primary source

NIH RePORTER: https://reporter.nih.gov/project-details/10456455

## Citation

> US National Institutes of Health, RePORTER application 10456455, CST6-mRNA activated matrices for efficient bone regeneration (1R21DE031042-01A1). Retrieved via AI Analytics 2026-05-22 from https://api.ai-analytics.org/grant/nih/10456455. Licensed CC0.

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