Harnessing Plant Secondary Metabolites for Vaccine Development in Africa: Current Insights and Future Prospects

Karl Cirilson Ellema Angulo

Coastal ecosystems support high levels of marine biodiversity and provide essential services, including shoreline protection, carbon sequestration, and fisheries production. Silot Bay, Liloan, Cebu, Philippines, is an ecologically and socio-economically important embayment; however, biodiversity assessments in the area remain sparse and temporally fragmented. This study presents a narrative review with structured literature search elements to synthesize available ecological studies on major taxonomic groups, including mangroves, fish, meiofauna, and algae, and to evaluate methodological consistency among studies retrieved from Google Scholar, ScienceDirect, Philippine E-Journals, and institutional repositories from local universities. A total of nine studies met the inclusion criteria, the majority of which were conducted prior to 2000, with post-2000 research limited to a single study on algal communities. Substantial variation in sampling methods, effort, spatial coverage, and taxonomic resolution constrains direct comparison across studies and limits interpretation of temporal patterns. Differences in reported species richness and community composition are evident across taxa; however, these patterns cannot be confidently attributed to ecological change due to methodological inconsistencies and limited data availability. The small number of studies and reliance on partially inaccessible historical data further restrict the establishment of a reliable biodiversity baseline for Silot Bay. Overall, this review highlights significant knowledge gaps and emphasizes the need for standardized, multi-taxa biodiversity assessments to support long-term monitoring and evidence-based coastal management.

Aquatic Life Sciences

Courage Chandipwisa, Harrison Banda, Kapembwa Chabala, Tendai Pride Zenda, Agness Shimilimo

Africa’s vaccine and drug research and development capacity remains limited by infrastructural gaps, fragmented data systems, and shortages of skilled personnel, constraining timely therapeutic discovery and clinical translation in low-resource settings. Artificial intelligence (AI) and machine learning offer potential solutions by enabling predictive modelling, accelerating compound screening, improving genomic surveillance, and supporting adaptive clinical trial design. This narrative review synthesizes studies and institutional reports published between 2015 and 2025 from major scientific databases to examine AI applications in vaccine and drug development relevant to African contexts. Thematic analysis identified key patterns related to infrastructure readiness, workforce capacity, and translational implementation, with findings validated through evidence triangulation and consensus review. Results show that AI platforms have supported infectious disease candidate identification, pandemic vaccine development, malaria drug resistance mapping, and predictive analytics for vaccine distribution. While accelerated outcomes were evident during public health emergencies, routine implementation remains constrained by resource availability. Major challenges include inadequate digital infrastructure, fragmented regulatory systems, and limited technical expertise despite ongoing capacity-building initiatives. The review proposes an integrated framework linking infrastructure, skills development, and ethical governance as critical factors for sustainable AI adoption in African biomedical research. Strengthening investment, fostering regional collaboration, and developing context-specific ethical frameworks are essential to ensure equitable access, enhance innovation capacity, and build resilient biomedical research ecosystems across Africa.

Sciences of Pharmacy

Selvi Megawati, Indah Woro Utami

Lawsone (2-hydroxy-1, 4-naphthoquinone), the principal naphthoquinone of Lawsonia inermis, has attracted interest as a natural anti-inflammatory/analgesic lead that may offer a safer profile than long-term non-steroidal anti-inflammatory drugs. This structured narrative review synthesises evidence from 14 accessible and highly relevant publications (prioritising 2020 onwards) to clarify the mechanistic basis of its analgesic potential. Direct evidence from preclinical studies indicates that lawsone produces anti-inflammatory and anti-arthritic effects comparable to reference drugs and is associated with improved hepatic and renal markers at effective doses. Mechanistically, two experimentally supported axes predominate: (i) reduced prostaglandin biosynthesis, reflected by significant lowering of serum PGE2 and consistent with COX-2 modulation, and (ii) suppression of NF-κB signalling with downstream reductions in key pro-inflammatory cytokines (TNF-α, IL-1β, IL-6). In contrast, potential modulation of the P2X7 purinergic receptor (P2X7R) remains hypothetical, supported mainly by pharmacological and computational studies of structurally related 1, 4-naphthoquinone analogues that bind the P2X7R allosteric pocket and inhibit ATP-driven Ca2+ influx and macropore formation. Overall, the evidence positions lawsone as a promising multi-target preclinical scaffold while highlighting the need for direct P2X7R validation, protein-level pathway confirmation, and translational studies.

Sciences of Pharmacy

Courage Chandipwisa, Harrison Banda, Agness Shimilimo

Plant secondary metabolites are natural compounds with immunomodulatory and adjuvant properties that may complement conventional vaccines and support regionally relevant vaccine strategies in Africa. This structured narrative review analyzed English-language studies published between 2000 and 2025 from PubMed, Google Scholar, Elsevier, and EBSCOhost. Included publications comprised original research, systematic reviews, and clinical trials addressing mechanisms, formulation, safety, and clinical development. Evidence included in vitro studies, animal models, formulation research, and human investigations. Preclinical findings show that selected metabolites enhance antigen presentation, promote dendritic cell maturation, and strengthen humoral and cellular immune responses through modulation of key signaling pathways. Triterpenoid saponins from Quillaja saponaria have progressed into clinical adjuvant platforms, while polysaccharides from Moringa oleifera and flavonoids from Curcuma longa and Artemisia annua demonstrate immunostimulatory effects and improved antigen stability in preclinical models. Nanoencapsulation improves compound stability and delivery but lacks sufficient clinical validation. Clinical translation requires standardized phytochemical characterization, comprehensive safety evaluation, regulatory harmonization, validated manufacturing processes, and adequately powered clinical trials with defined immunological endpoints.

Sciences of Phytochemistry