Canna Indica L. Harnessing leaf extract for targeted fibroblast proliferation

Cutaneous wounds that fail to close in an orderly and timely manner continue to burden patients and health systems, and the dermal fibroblast is central to their repair because it builds the new connective tissue that fills and strengthens the injured site. Plant-derived preparations have long been applied to wounds in traditional medicine, and modern research increasingly links their benefit to secondary metabolites that influence inflammation, oxidative stress, cell proliferation and matrix deposition. Canna indica L. (Cannaceae), known as Indian shot, is a widely distributed ornamental and medicinal herb whose crushed plant material is traditionally applied to cuts and bruises and which is reported to contain phenolics, flavonoids, tannins, alkaloids and terpenoid-type compounds. This review brings together current knowledge on the botany, ethnomedicinal background, phytochemistry and reported pharmacology of C. indica and sets it against present understanding of fibroblast biology in wound repair. The molecular regulators of fibroblast proliferation, including growth factor, transforming growth factor-β, PI3K/Akt, MAPK/ERK, Wnt, NF-κB and Nrf2 signalling, are discussed, followed by an analysis of how the phytochemical classes found in the leaf could plausibly act on these routes. Extraction and standardisation strategies, preclinical models, formulation approaches, safety aspects and the need to avoid uncontrolled proliferation leading to hypertrophic scarring are also considered. Although the phytochemical and antioxidant profile of the leaf supports a rational case for its use in tissue repair, direct experimental proof that C. indica leaf extract promotes fibroblast proliferation is, to the best of our knowledge, still limited. The article is intended as a hypothesis-building review that identifies research gaps rather than as a summary of proven efficacy. Standardised extracts, well-designed cell-based assays, mechanistic studies and controlled in vivo work are therefore proposed as the next steps towards a validated, targeted fibroblast-supporting preparation.