Repurposing Sorbifolin for Wound Recovery and Analgesia: Investigating its Therapuetic Potential in Adult Albino Wistar Rats

Wound healing is a coordinated biological response that restores tissue integrity after injury. It requires tightly regulated interactions among inflammatory cells, platelets, fibroblasts, endothelial cells, keratinocytes, extracellular-matrix components and signaling mediators. Although the process is often described as a sequence of hemostasis, inflammation, proliferation and remodeling, these phases overlap considerably rather than occurring as isolated events [1-4]. Failure to progress appropriately through these stages can result in delayed closure, infection, excessive scar formation, chronic wounds or loss of tissue function. The biological burden of wound injury is frequently accompanied by pain, making simultaneous control of tissue repair and nociception clinically relevant.

Traditional medicine has historically provided an important source of therapeutic leads. Plant-derived preparations were used long before the development of modern pharmacology, and systematic investigation of traditional remedies has contributed to the discovery of pharmacologically useful natural products [5-10]. The supplied thesis emphasizes that the diversity of medicinal plants provides a reservoir of chemical structures that can be investigated through ethnopharmacological selection, biological screening, isolation of active constituents and subsequent pharmacological characterization. Such approaches remain relevant because natural products may interact with multiple biological targets and can provide chemical scaffolds that are difficult to identify through purely synthetic screening [5,8,11-15].

Flavonoids are one of the major classes of plant secondary metabolites investigated for antioxidant, anti-inflammatory, antimicrobial, vascular and tissue-protective effects. Their biological activity is influenced by hydroxylation, methoxylation, glycosylation and other structural features. Several flavonoid-containing plant products have demonstrated effects relevant to wound repair, including modulation of oxidative stress, inflammatory signaling, fibroblast migration, collagen production and extracellular-matrix organization [16-18]. Because inflammation and oxidative stress are integral to both wound pathology and pain signaling, a flavonoid with activity in these pathways may have the potential to influence both endpoints.

Sorbifolin is a naturally occurring flavone identified in several plant sources. The supplied thesis identifies it as scutellarein 7-methyl ether and gives the molecular formula C16H12O6. Historical phytochemical studies described sorbifolin or related glycosides in Sorbaria sorbifolia, Spathelia sorbifolia and other plant taxa, with structures established using spectroscopic, chemical and synthetic approaches [19-23]. Subsequent investigations have identified sorbifolin among flavonoids isolated from plants including Pterogyne nitens, Ruellia tuberosa and other taxa [24-28].

The biological literature summarized in the source document does not establish wound healing or analgesia as the principal pharmacological activities of Sorbifolin. Instead, reported findings include antioxidant or radical-scavenging activity, myeloperoxidase-related effects, antimicrobial or antiparasitic activity, antiviral activity and computational predictions involving enzyme or protein targets [24-31]. For example, Fernandes et al. evaluated flavones from Pterogyne nitens for myeloperoxidase inhibition and radical-scavenging capacity, while Hernández-Bolio et al. reported anti-giardial activity of isolated flavonoids, including sorbifolin [24,25]. Shimizu et al. described inhibition of hepatitis C virus entry by flavonoids from Pterogyne nitens, including sorbifolin [29]. These findings provide biological plausibility for continued pharmacological investigation but should not be interpreted as direct evidence of clinical efficacy in wound healing or pain.

The wound-healing rationale is particularly relevant because successful repair requires timely control of inflammation followed by proliferation, angiogenesis, re-epithelialization and extracellular-matrix maturation. Flavonoid compounds have been investigated for their ability to reduce oxidative injury and modulate inflammatory mediators while supporting fibroblast activity. Liu et al. reported wound-healing and antioxidant effects of a flavonoid isolated from Periploca sepium Bunge, associated with fibroblast migration and collagen synthesis [18]. A broader review of plant-derived compounds similarly described multiple mechanisms through which natural compounds may influence wound repair [17]. These studies do not prove that Sorbifolin acts identically, but they provide a rational comparative framework.

Pain associated with tissue injury is generated by activation of nociceptors and subsequent processing within peripheral and central nervous systems. Thermal nociception models such as tail immersion and hot plate tests are commonly used in experimental pharmacology to evaluate changes in response latency after administration of candidate analgesics. The supplied study selected diclofenac sodium as a reference treatment. Diclofenac is an established non-steroidal anti-inflammatory drug whose analgesic and anti-inflammatory effects are related to cyclooxygenase inhibition and decreased prostanoid synthesis [32]. Comparison with a standard agent therefore provides an internal benchmark for the magnitude of the observed response.

The therapeutic concept underlying the present investigation is not that Sorbifolin should immediately replace established wound-care or analgesic medicines, but that its biological profile warrants experimental evaluation. A natural compound capable of influencing wound contraction, epithelialization and pain responses could represent a useful lead for topical or systemic development. At the same time, natural origin does not automatically imply safety or superior efficacy; appropriate toxicological, pharmacological and formulation studies remain essential [5,12-15].

The present study was therefore designed to evaluate the acute safety profile and pharmacological effects of Sorbifolin in experimental rats, focusing on two clinically relevant domains: wound repair and analgesia. Wound healing was assessed using an open excision wound model through serial measurement of wound area and determination of epithelialization time. Analgesic activity was assessed using tail immersion and hot plate tests, which measure latency to withdrawal or nociceptive behavior following a thermal stimulus. The study further compared Sorbifolin with simple ointment control for wound healing and with diclofenac sodium for analgesia.

2. SCIENTIFIC BACKGROUND AND RATIONALE

2.1 Wound healing biology

The immediate response to tissue injury is hemostasis. Platelet adhesion and aggregation, vasoconstriction and activation of the coagulation cascade help limit blood loss and produce a provisional fibrin matrix. Platelets also release mediators that contribute to subsequent inflammatory and reparative events [1,2]. The inflammatory phase follows rapidly and involves recruitment of neutrophils and macrophages. Neutrophils contribute to microbial defense and removal of damaged material, while macrophages coordinate repair by releasing cytokines and growth factors that influence fibroblast activity, angiogenesis and matrix formation [2,3].

Fig 1 Phases of wound healing

Figure 2: Effect of Sorbifolin on wound healing a. Control group; b. Sorbifolin group; c. Standard group

**p<0.01 versus control by one-way ANOVA with Dunnett's post-test; n=6. In this model, the post-treatment latency observed with Sorbifolin was approximately 91% of the diclofenac value, although direct statistical comparison between the two active groups was not reported.

6. DISCUSSION

The present study provides preliminary experimental evidence that Sorbifolin possesses two pharmacological properties relevant to tissue injury: enhancement of wound repair and attenuation of thermal nociceptive responses. The findings are notable because Sorbifolin has been studied primarily in phytochemical and other biological contexts, while direct investigation of its wound-healing and analgesic effects is comparatively limited in the supplied literature. The results should therefore be viewed as an initial pharmacological characterization rather than proof of therapeutic efficacy.

6.1 Wound contraction and epithelialization

The wound model demonstrated a consistent separation between control and active-treatment groups from the first week onward. Sorbifolin-treated wounds were smaller than control wounds at days 7, 10, 13 and 16, and the source reports p<0.001 for these comparisons. By day 16, the mean wound area in the Sorbifolin group was 71 mm², compared with 184 mm² in control. This corresponds to a substantial reduction in residual wound area and indicates accelerated macroscopic closure.

The observed effect is biologically plausible in the context of flavonoid pharmacology, but the present dataset does not directly measure fibroblast proliferation, collagen content, hydroxyproline, angiogenesis, inflammatory cytokines, oxidative stress markers or histological repair. Therefore, the thesis suggestion that Sorbifolin may promote fibroblast proliferation and collagen synthesis should be regarded as a mechanistic hypothesis rather than a demonstrated mechanism in this experiment. Liu et al. showed that another flavonoid could promote fibroblast migration and collagen synthesis in association with wound healing [18], and Kim et al. summarized multiple pathways through which plant-derived compounds may influence tissue repair [17]. These reports support the plausibility of a flavonoid-mediated effect without establishing identity of mechanism.

Sorbifolin performed numerically close to the reference topical treatment. At day 16, the Sorbifolin group had a mean residual wound area of 71 ± 3.7 mm², while povidone-iodine had 80 ± 5.8 mm². The reported epithelialization periods were similarly close, at 15.24 and 15.52 days. This is an important observation because it suggests that the effect was not limited to a single measurement of wound size. Nevertheless, povidone-iodine is primarily used for antiseptic purposes and the present experiment was not designed to determine whether Sorbifolin has equivalent antimicrobial activity. A direct head-to-head comparison should therefore be interpreted as a comparison of the measured wound endpoint rather than an assertion of therapeutic equivalence.

The wound-healing effect may reflect several overlapping biological processes. Reduction of excessive inflammation could create a more favorable environment for proliferation and matrix deposition, while antioxidant activity could reduce oxidative damage to cells participating in repair. The source literature reports radical-scavenging activity for flavones containing Sorbifolin [24], and broader studies of flavonoids describe anti-inflammatory and tissue-protective effects [17,18]. However, no antioxidant or inflammatory biomarker was measured in the present study, so the proposed relationship remains inferential.

6.2 Analgesic effects

Sorbifolin produced measurable increases in thermal nociceptive latency in both models. In the tail-immersion test, latency increased from 2.22 to 3.71 s, while in the hot-plate test it increased from 5.45 to 9.92 s. The reported inhibition values were 41.4% and 56.83%, respectively. These findings indicate that the analgesic response was reproducible across two thermal paradigms, although the magnitude differed between models.

Diclofenac sodium produced a larger effect in both assays, with reported inhibition values of 64.2% in tail immersion and 61.92% in the hot plate. This provides a useful benchmark: Sorbifolin demonstrated substantial activity but did not exceed the established reference drug. The finding is consistent with the cautious conclusion that Sorbifolin may have analgesic potential rather than being equivalent to a standard NSAID.

The mechanism of the analgesic response cannot be established from the present study. Thermal response tests can detect changes in nociceptive processing, but increased latency can theoretically arise from analgesia, altered arousal, motor impairment or other central effects. The source thesis proposes that Sorbifolin may influence cyclooxygenase or pain-related pathways based on the known activity of flavonoids. Diclofenac itself acts through cyclooxygenase inhibition [32]. Chen et al. described analgesic effects of scutellarin in a neuropathic pain model associated with NF-κB signaling modulation [33]. Because scutellarin and Sorbifolin are chemically related flavonoids, this literature provides a mechanistic hypothesis but not direct evidence that Sorbifolin acts through the same pathway.

6.3 Relationship between wound healing and analgesia

The concurrent wound-healing and analgesic findings are potentially important. Pain and inflammation can influence mobility, stress responses and patient adherence to wound-care procedures. A compound that can influence both tissue repair and nociception may have an integrated therapeutic profile. However, the present experiments were conducted as separate models and did not determine whether the analgesic effect contributed to the observed wound closure. Nor did they assess whether reduced pain behavior altered locomotion or wound manipulation.

A possible unifying hypothesis is modulation of inflammatory signaling. Inflammation is essential during the early phase of repair, but prolonged or excessive inflammation can delay resolution. Flavonoids may influence inflammatory mediators and redox pathways [17,18,33]. The source thesis also cites evidence that flavonoids can affect inflammatory signaling, including NF-κB-related processes [33]. Future work should therefore measure inflammatory cytokines, cyclooxygenase expression, prostaglandins, oxidative-stress markers, macrophage phenotype and tissue histology to determine whether these mechanisms contribute to the observed phenotype.

6.4 Safety findings

The acute toxicity experiment did not identify mortality, overt clinical toxicity or major macroscopic or histological abnormalities at the tabulated 200 mg/kg dose. Body weights increased in all documented animals. These observations are reassuring for preliminary experimentation but do not establish chronic safety, reproductive safety, genotoxicity, organ-specific pharmacokinetics or topical tolerability. Acute toxicity is only one component of a complete safety assessment.

Furthermore, the source document contains a discrepancy between a narrative reference to 2000 mg/kg and tables documenting 200 mg/kg. This is not a trivial editorial issue because the numerical interpretation of an acute toxic class study depends on the actual administered dose. The present manuscript deliberately reports the tabulated 200 mg/kg dataset and flags the discrepancy for verification. The final journal submission should reconcile this point using the original animal study records.

6.5 Comparison with previous literature

The phytochemical literature confirms that Sorbifolin is a structurally characterized natural flavone. Chan et al. reported the structure of sorbifolin from Spathelia sorbifolia, while Taylor et al. subsequently described synthetic work related to the compound [22,23]. Arisawa et al. identified sorbifolin as scutellarein-7-methyl ether in Sorbaria stellipila [21]. These studies provide a chemical foundation for considering Sorbifolin as a defined compound rather than an unidentified botanical extract.

The biological studies summarized in the thesis demonstrate that Sorbifolin can occur in chemically complex plant matrices and has been investigated in several pharmacological contexts. Fernandes et al. evaluated flavones from Pterogyne nitens for myeloperoxidase inhibition and radical scavenging [24]. Hernández-Bolio et al. reported that sorbifolin showed low anti-giardial activity relative to another flavonoid in their model and did not show cytotoxicity toward HEK-293 cells under the reported conditions [25]. Shimizu et al. observed antiviral effects against hepatitis C virus entry for flavonoids including Sorbifolin [29]. These findings illustrate the breadth of biological activity associated with the compound but also reinforce that activity is highly model-dependent.

The wound-healing findings in the present study are consistent with the broader literature describing flavonoids as multifunctional modulators of tissue repair. Liu et al. reported that a flavonoid isolated from Periploca sepium Bunge promoted fibroblast migration and collagen synthesis [18]. Kim et al. discussed plant-derived compounds that can influence inflammatory regulation, matrix formation and cell migration during wound repair [17]. The current findings extend this general concept by providing an in vivo wound-closure phenotype for Sorbifolin. Importantly, the study does not demonstrate the specific cellular pathways responsible.

The analgesic findings also fit within a wider flavonoid pharmacology framework. Chen et al. reported analgesic effects of scutellarin associated with modulation of NF-κB signaling in a neuropathic pain model [33]. The structural relationship between scutellarin-type flavonoids and Sorbifolin makes anti-inflammatory signaling a plausible area for investigation. Nevertheless, the tail-immersion and hot-plate results alone cannot determine whether Sorbifolin has anti-inflammatory, central analgesic, peripheral analgesic, or mixed activity.

6.6 Strengths of the study

The study has several strengths. First, the wound-healing assessment used serial measurements across multiple time points rather than a single endpoint. Second, epithelialization time was recorded in addition to wound area, providing a second indicator of repair. Third, two independent thermal nociception models were used for analgesic evaluation. Fourth, both wound and analgesic experiments included recognized reference treatments, allowing contextual interpretation of the magnitude of activity. Finally, the acute toxicity component provided an initial safety screen before pharmacological evaluation.

6.7 Limitations

The most important limitations are the small group size (n=6), absence of raw individual-level data, lack of detailed randomization/blinding information, incomplete documentation of compound purity and formulation, and absence of mechanistic biomarkers. The wound experiment did not report histopathological scoring of granulation tissue, collagen organization or angiogenesis. The analgesic experiments did not report all time-point values despite the methods specifying measurements at 30, 45, 60 and 90 min. Thus, the reported pre- and post-treatment summaries cannot establish a complete pharmacodynamic time course.

The study also contains source-document inconsistencies in acute toxicity dosing and wording regarding wound-treatment dose. These issues should be corrected by reference to the laboratory notebook before submission. In addition, the supplied thesis does not provide an exact IAEC approval number, supplier information, batch/purity information or a complete description of housing enrichment and humane endpoints. These are important reporting details for a contemporary animal study.

6.8 Implications for future research

Future investigations should include dose-ranging studies, topical versus systemic formulations, pharmacokinetic characterization, wound histology, hydroxyproline/collagen quantification, angiogenesis markers, inflammatory cytokines, oxidative-stress markers and microbiological assessment. Analgesic studies should incorporate additional inflammatory and chemical nociception models and examine the temporal profile of the response. Mechanistic experiments targeting cyclooxygenase, NF-κB, MAPK, Nrf2 or related pathways could help establish causality rather than relying on structural analogy.

Longer-term safety evaluation is also needed. Before clinical translation, reproducible pharmaceutical-grade Sorbifolin with defined purity and stability should be developed, and topical tolerability should be assessed. If wound healing remains the principal development objective, a standardized topical formulation may be particularly appropriate because local exposure can potentially be optimized while limiting systemic exposure. These are future research directions rather than conclusions established by the present experiment.

7. CONCLUSION

The present experimental investigation indicates that Sorbifolin has promising wound-healing and analgesic activities in rats. In the open excision wound model, Sorbifolin at the reported 50 mg/kg treatment produced faster wound contraction than control and yielded a day-16 wound area of 71 ± 3.7 mm², compared with 184 ± 9.8 mm² in control. It also produced a reported percentage protection of 97.49% and reduced the epithelialization period to 15.24 days. These values were numerically comparable to those obtained with 10% povidone-iodine.

In the analgesic experiments, Sorbifolin increased thermal response latency in both the tail-immersion and hot-plate tests. The reported inhibition values were 41.4% and 56.83%, respectively. Diclofenac sodium produced greater inhibition in both models, indicating that the Sorbifolin response, although substantial, was below the reference NSAID under the conditions tested.

The acute toxicity observations showed no mortality or overt toxicity in the tabulated 200 mg/kg dataset, supporting preliminary tolerability at the experimental dose. However, the internal dose discrepancy in the thesis must be reconciled before publication. Overall, the findings justify further investigation of Sorbifolin as a natural-product lead for wound repair and pain modulation, but mechanistic studies, dose optimization, formulation development, expanded toxicology and independent confirmatory experiments are required before any therapeutic claims can be made.

8. DECLARATIONS AND REPORTING STATEMENTS

Consent for publication: Not applicable to this animal study.

Data availability: The present manuscript reports the summary data available in the supplied thesis. Individual-level raw data were not provided in the source document.

Conflict of interest: To be completed by the authors.

Author contributions: To be completed by the authors according to the journal's taxonomy.

Acknowledgments: To be completed by the authors.

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