Development and Preclinical Testing of a Novel Neurodenervant in the Rat: C3 Transferase Mitigates Botulinum Toxin’s Adverse Effects on Muscle Mechanics
Spasticity, characterized by elevated muscle tone, is commonly managed with botulinum toxin type A (BTX-A). However, BTX-A can paradoxically increase passive muscle forces, narrow muscles’ length range of force exertion (l<sub>range</sub>), and elevate extracellular matrix (ECM) stiffnes...
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MDPI AG
2025-05-01
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| author | Cemre Su Kaya Keles Zeynep D. Akdeniz Dogan Can A. Yucesoy |
| author_facet | Cemre Su Kaya Keles Zeynep D. Akdeniz Dogan Can A. Yucesoy |
| author_sort | Cemre Su Kaya Keles |
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| description | Spasticity, characterized by elevated muscle tone, is commonly managed with botulinum toxin type A (BTX-A). However, BTX-A can paradoxically increase passive muscle forces, narrow muscles’ length range of force exertion (l<sub>range</sub>), and elevate extracellular matrix (ECM) stiffness. C3 transferase, known to inhibit myofibroblast and fascial tissue contractility, may counteract ECM stiffening. This study investigated whether combining BTX-A with C3 transferase reduces active forces without altering passive forces or l<sub>range</sub>. Additionally, we examined the isolated effects of C3 transferase on muscle levels. Male Wistar rats received injections into the tibialis anterior (TA): Control (<i>n</i> = 7, saline) and C3 + BTX-A (<i>n</i> = 7, 2.5 µg C3 + 0.1U BTX-A). TA forces were measured one month post-injection, and isolated C3 transferase effects were assessed in separate groups (Control and C3, <i>n</i> = 6 each). Active forces were 43.5% lower in the C3 + BTX-A group compared to the Control group. No differences between groups in passive forces (<i>p</i> = 0.33) or l<sub>range</sub> (<i>p</i> = 0.19) were observed. C3 transferase alone had no significant effect on relative muscle mass (<i>p</i> = 0.298) or collagen content (<i>p</i> = 0.093). Supplementing BTX-A with C3 transferase eliminates BTX-A’s adverse effects at the muscle level. C3 transferase alone causes no atrophy or collagen increase, which are key factors in BTX-A-induced ECM stiffening. This novel neurodenervant formula shows promise for advancing spasticity management. |
| format | Article |
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| institution | OA Journals |
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| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
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| series | Toxins |
| spelling | doaj-art-6c7b05af0cec4794a948db2d0992a2022025-08-20T02:33:51ZengMDPI AGToxins2072-66512025-05-0117523410.3390/toxins17050234Development and Preclinical Testing of a Novel Neurodenervant in the Rat: C3 Transferase Mitigates Botulinum Toxin’s Adverse Effects on Muscle MechanicsCemre Su Kaya Keles0Zeynep D. Akdeniz Dogan1Can A. Yucesoy2Institute of Biomedical Engineering, Boğaziçi University, 34684 Istanbul, TurkeyDepartment of Plastic, Reconstructive, and Aesthetic Surgery, Marmara University, 34854 Istanbul, TurkeyInstitute of Biomedical Engineering, Boğaziçi University, 34684 Istanbul, TurkeySpasticity, characterized by elevated muscle tone, is commonly managed with botulinum toxin type A (BTX-A). However, BTX-A can paradoxically increase passive muscle forces, narrow muscles’ length range of force exertion (l<sub>range</sub>), and elevate extracellular matrix (ECM) stiffness. C3 transferase, known to inhibit myofibroblast and fascial tissue contractility, may counteract ECM stiffening. This study investigated whether combining BTX-A with C3 transferase reduces active forces without altering passive forces or l<sub>range</sub>. Additionally, we examined the isolated effects of C3 transferase on muscle levels. Male Wistar rats received injections into the tibialis anterior (TA): Control (<i>n</i> = 7, saline) and C3 + BTX-A (<i>n</i> = 7, 2.5 µg C3 + 0.1U BTX-A). TA forces were measured one month post-injection, and isolated C3 transferase effects were assessed in separate groups (Control and C3, <i>n</i> = 6 each). Active forces were 43.5% lower in the C3 + BTX-A group compared to the Control group. No differences between groups in passive forces (<i>p</i> = 0.33) or l<sub>range</sub> (<i>p</i> = 0.19) were observed. C3 transferase alone had no significant effect on relative muscle mass (<i>p</i> = 0.298) or collagen content (<i>p</i> = 0.093). Supplementing BTX-A with C3 transferase eliminates BTX-A’s adverse effects at the muscle level. C3 transferase alone causes no atrophy or collagen increase, which are key factors in BTX-A-induced ECM stiffening. This novel neurodenervant formula shows promise for advancing spasticity management.https://www.mdpi.com/2072-6651/17/5/234botulinum toxin type AC3 transferasespasticity managementmuscle forcerange of motionextracellular matrix stiffness |
| spellingShingle | Cemre Su Kaya Keles Zeynep D. Akdeniz Dogan Can A. Yucesoy Development and Preclinical Testing of a Novel Neurodenervant in the Rat: C3 Transferase Mitigates Botulinum Toxin’s Adverse Effects on Muscle Mechanics Toxins botulinum toxin type A C3 transferase spasticity management muscle force range of motion extracellular matrix stiffness |
| title | Development and Preclinical Testing of a Novel Neurodenervant in the Rat: C3 Transferase Mitigates Botulinum Toxin’s Adverse Effects on Muscle Mechanics |
| title_full | Development and Preclinical Testing of a Novel Neurodenervant in the Rat: C3 Transferase Mitigates Botulinum Toxin’s Adverse Effects on Muscle Mechanics |
| title_fullStr | Development and Preclinical Testing of a Novel Neurodenervant in the Rat: C3 Transferase Mitigates Botulinum Toxin’s Adverse Effects on Muscle Mechanics |
| title_full_unstemmed | Development and Preclinical Testing of a Novel Neurodenervant in the Rat: C3 Transferase Mitigates Botulinum Toxin’s Adverse Effects on Muscle Mechanics |
| title_short | Development and Preclinical Testing of a Novel Neurodenervant in the Rat: C3 Transferase Mitigates Botulinum Toxin’s Adverse Effects on Muscle Mechanics |
| title_sort | development and preclinical testing of a novel neurodenervant in the rat c3 transferase mitigates botulinum toxin s adverse effects on muscle mechanics |
| topic | botulinum toxin type A C3 transferase spasticity management muscle force range of motion extracellular matrix stiffness |
| url | https://www.mdpi.com/2072-6651/17/5/234 |
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