\n
Snail assortment and protein extraction<\/h3>\n
The freshwater snails L. carinatus and B. unicolor investigated listed below are non-protected, decrease invertebrate species and had been collected from a freshwater locality at Lake Manzalah, Dakahlia Governorate, Egypt (31\u00b0\u00a011\u2032\u00a0N, 32\u00b0\u00a002\u2032\u00a0E). This examine was carried out on the Medical Malacology Division, Theodor Bilharz Analysis Institute, as a part of a field-based survey on species identification, illness transmission potential, and bioactive molecules. Below prevailing regional pointers and institutional insurance policies, the gathering and use of non-endangered freshwater invertebrates for survey-based or exploratory analysis don’t require formal approval from an animal ethics committee or particular permits. All sampling was carried out following commonplace area practices, making certain minimal environmental disturbance and accountable specimen dealing with. Ten grownup snails (Shell-size ranges had been 20\u201330 mm for L. carinatus, and 18\u201325 mm for B. unicolor) had been used from every species. Snails had been maintained alive in well-aerated faucet water at roughly 20\u00a0\u00b0C and fed contemporary lettuce till use. Tender tissues had been dissected after shell removing, rinsed in chilly saline to take away particles and saved at\u2009\u2212\u200920\u00a0\u00b0C till extraction.<\/p>\n
Crude protein extracts had been ready with slight modifications of ordinary protocols. Frozen entire gentle tissues (2\u20133\u00a0g moist tissue from every species-specific pooled pattern) had been thawed on ice and homogenized (1:3 w\/v) in 20\u00a0mM potassium phosphate buffer (pH 7.0). Homogenates had been centrifuged at 10,000\u2009\u00d7\u2009g for 30\u00a0min at 4\u00a0\u00b0C to take away insoluble material2. The supernatant was frozen and subsequently freeze-dried to acquire a dry protein powder. The lyophilized materials was then reconstituted in an acceptable quantity of 20\u00a0mM potassium phosphate buffer (pH 7.0) previous to additional analyses. Extra salt was eliminated by in a single day dialysis in opposition to the identical buffer. The desalted crude protein extract was saved at 4\u00a0\u00b0C and its protein focus decided utilizing the Bradford assay with bovine serum albumin as a standard17.<\/p>\n
Antioxidant enzyme assays<\/h3>\n
Actions of catalase, superoxide dismutase and glutathione S-transferase had been measured spectrophotometrically. CAT exercise was decided utilizing a response combination (3.0\u00a0mL) contained 0.05\u00a0M potassium phosphate buffer (pH 7.0) and 0.02\u00a0M hydrogen peroxide (H2O2). The response was initiated by addition of enzyme answer and the lower in absorbance at 240\u00a0nm on account of H2O2 decomposition was recorded for 1\u00a0min. One unit of CAT exercise was outlined as the quantity of enzyme required to decompose 1\u00a0\u00b5mol of H2O2 (utilizing an extinction coefficient of 43.6\u00a0M\u22121cm\u22121) per minute at 25\u00a0\u00b0C18.<\/p>\n
SOD exercise was measured in a 1.0\u00a0mL response combination contained 0.05\u00a0M potassium phosphate buffer (pH 7.8), 0.01\u00a0mM cytochrome c, 0.1\u00a0mM EDTA and 0.05\u00a0mM sodium xanthine. The response was began by including xanthine oxidase (21\u00a0mU), and the discount of cytochrome c was monitored at 550\u00a0nm. One unit of SOD exercise was outlined as the quantity of enzyme inflicting 50% inhibition of cytochrome c reduction19.<\/p>\n
GST exercise was assayed in a 1.0\u00a0mL combination contained 0.1\u00a0M potassium phosphate buffer (pH 6.5), 1\u00a0mM decreased glutathione (GSH), 1\u00a0mM 1-chloro-2,4-dinitrobenzene (CDNB) dissolved in ethanol (ultimate ethanol\u2009<\u20094%) and the enzyme answer. The formation of the GSH\u2013CDNB conjugate was adopted as a rise in absorbance at 340\u00a0nm at 37\u00a0\u00b0C for 3\u00a0min, utilizing an extinction coefficient of 9.6\u00a0mM\u22121cm\u22121. One unit of GST exercise was outlined as the quantity of enzyme catalyzing the conjugation of 1\u00a0\u00b5mol of CDNB per minute20. All measurements had been carried out in triplicate and expressed as imply\u2009\u00b1\u2009commonplace deviation (SD).<\/p>\n
SDS\u2013PAGE protein profiling<\/h3>\n
Protein profiles of L. carinatus and B. unicolor crude protein extracts had been examined by SDS\u2013PAGE. Samples had been blended with Laemmli pattern buffer containing SDS and \u03b2-mercaptoethanol, heated at 95\u00a0\u00b0C for five\u00a0min and loaded onto 5% stacking\u00a0\/\u00a012% resolving polyacrylamide gels. Electrophoresis was carried out at fixed voltage following Laemmli (1970), utilizing pre-stained molecular mass markers for calibration21,22. Gels had been stained with Coomassie Sensible Blue R-250 and destained till discrete bands had been seen. Obvious molecular lots of main bands had been estimated by comparability with the markers.<\/p>\n
Antimicrobial exercise<\/h3>\n
The antimicrobial exercise of the crude protein extracts was evaluated at 500\u00a0\u00b5g\/mL. Aliquots of fifty \u00b5L had been loaded onto 5\u00a0mm sterile filter-paper discs (Whatman No. 1), dried and positioned on agar plates seeded with the check microorganisms. Bacterial and yeast cultures had been ready on nutrient agar, whereas fungal cultures had been grown on potato dextrose agar (PDA; DSMZ 130). Microbial suspensions had been adjusted to 107\u2013108 CFU\/mL. Plates had been incubated at 37\u00a0\u00b0C for twenty-four\u00a0h for micro organism and yeast and at 30\u00a0\u00b0C for 48\u00a0h for fungi. Inhibition zones had been measured in millimetres. The check organisms had been Escherichia coli, Staphylococcus aureus, Candida albicans and Aspergillus niger23. Ciprofloxacin and nystatin served because the antibacterial and antifungal constructive controls, respectively, whereas the protein buffer answer served because the detrimental management. All strains had been obtained from the tradition assortment of the Microbial Chemistry Division, Nationwide Analysis Centre, Egypt.<\/p>\n
The minimal inhibitory focus (MIC) of the crude protein extracts was decided in 96-well flat-bottom polystyrene microplates. Serial two-fold dilutions of the extracts had been ready in lysogeny broth (LB) at ultimate concentrations of 500, 250, 125, 62.5, 31.25, 15.62, 7.81, 3.90 and 1.95\u00a0\u00b5g\/mL in a complete quantity of 150 \u00b5L per properly. Every properly was inoculated with 10 \u00b5L of a logarithmic-phase bacterial tradition and incubated in a single day at 37\u00a0\u00b0C. Bacterial progress inhibition was assessed visually (clear wells indicating inhibition and turbid wells indicating progress) and quantitatively by measuring the absorbance at 600\u00a0nm (OD600) after roughly 20\u00a0h utilizing a SpectroStar Nano microplate reader (BMG LABTECH GmbH, Allmendgr\u00fcn, Germany). Untreated bacterial cultures served as controls, and the MIC was outlined because the lowest crude protein extract focus that produced no seen progress.<\/p>\n
Biofilm inhibitory exercise<\/h3>\n
The biofilm inhibitory exercise of the crude protein extracts was evaluated utilizing the microtiter-plate (MTP) assay in opposition to scientific strains of Pseudomonas aeruginosa, Staphylococcus aureus, Escherichia coli and Bacillus subtilis24. Biofilm formation was assessed in 96-well flat-bottom polystyrene plates by including 180\u00a0\u00b5L of LB broth (10\u00a0g tryptone, 5\u00a0g yeast extract and 10\u00a0g NaCl per litre) and 10 \u00b5L of an in a single day bacterial tradition per properly, adopted by 10 \u00b5L of crude protein extract. Plates had been incubated at 37\u00a0\u00b0C for twenty-four\u00a0h, washed with phosphate-buffered saline (PBS, pH 7.2) to take away non-adherent cells, and the remaining sessile micro organism had been mounted with 2% sodium acetate and stained with 0.1% crystal violet. After washing and air-drying, the sure dye was solubilised with 95% ethanol and the absorbance was measured at 595\u00a0nm utilizing a microplate reader (BMG LABTECH GmbH, Allmendgr\u00fcn, Germany). A clean management (progress medium with out extract) served because the baseline for calculating the share of biofilm inhibition. The assay was carried out in triplicate and the outcomes are expressed as imply\u2009\u00b1\u2009SD.<\/p>\n
Cytotoxicity assay<\/h3>\n
Cytotoxicity of the crude protein extracts was assessed with the MTT assay in opposition to HepG2 hepatocellular carcinoma, MCF-7 breast adenocarcinoma, HCT-116 colorectal carcinoma, PC3 prostate carcinoma, HeLa cervical carcinoma and WI-38 regular human lung fibroblasts. Cell strains had been obtained from ATCC through VACSERA (Cairo, Egypt). Doxorubicin was used as an ordinary chemotherapeutic management.<\/p>\n
Cells had been cultured in RPMI-1640 medium supplemented with 10% fetal bovine serum, 100 U\/mL penicillin and 100\u00a0\u00b5g\/mL streptomycin at 37\u00a0\u00b0C in a humidified 5% CO2 environment. Cells had been seeded in 96-well plates at 1\u2009\u00d7\u2009104 cells per properly and allowed to stick for 48\u00a0h, then handled with serial concentrations of crude protein extracts or doxorubicin for twenty-four\u00a0h. After therapy, 20 \u00b5L of MTT answer (5\u00a0mg\/mL) had been added to every properly and incubated for 4\u00a0h. Medium was eliminated and 100 \u00b5L of dimethyl sulfoxide had been added to dissolve formazan crystals. Absorbance was recorded at 570\u00a0nm, and cell viability was calculated as (A\u2085\u2087\u2080 handled\/A\u2085\u2087\u2080 management)\u2009\u00d7\u2009100. IC50 values had been obtained from dose\u2013response curves25,26.<\/p>\n
LC\u2013MS\/MS peptide evaluation<\/h3>\n
Low-molecular-weight fractions of L. carinatus and B. unicolor crude protein extracts had been analyzed by LC\u2013MS\/MS27,28. Samples had been injected onto a narrow-bore C18 column coupled to an electrospray ion lure mass spectrometer operated over an m\/z vary of 200\u20135000. Cell phases consisted of 0.1% formic acid in water (A) and 0.1% formic acid in acetonitrile (B). A gradient from 5 to 95% B was run over 40\u00a0min at 300 \u00b5L\/min, adopted by re-equilibration to five% B.<\/p>\n
Uncooked information had been transformed to mzXML format utilizing MSConvert (ProteoWizard), and peaks had been processed with MZmine. Peptides had been recognized by matching precursor lots and MS\/MS fragmentation patterns to these beforehand reported for snail mucus peptides15. Retention occasions, sequences and fragment ions are summarised in Tables 4 and 5.<\/p>\n
Statistical evaluation<\/h3>\n
All assays had been carried out as three unbiased organic replicates, every carried out in technical triplicate. For the disc-diffusion antimicrobial screening, the inhibition zones had been recorded by direct bodily measurement of the zone diameters; as a result of this methodology yields discrete visible measurements reasonably than steady quantitative readings, the variety of replicates (n\u2009=\u20093) is reported reasonably than an ordinary deviation. The antibiofilm and MTT cytotoxicity assays had been carried out in triplicate, and their quantitative outcomes are expressed as imply\u2009\u00b1\u2009commonplace deviation (SD). IC50 values had been decided from the dose\u2013response curves by nonlinear regression evaluation, and selectivity indices (SI) had been calculated because the ratio of the IC50 for regular WI-38 fibroblasts to the IC50 for every most cancers cell line. Knowledge from enzyme exercise exams in addition to MTP and MTT assays had been analyzed utilizing GraphPad Prism software program (model 8.1.1; GraphPad Software program, San Diego, CA, USA). Variations amongst teams, together with comparisons between the snail crude protein extracts and doxorubicin, had been evaluated by one-way evaluation of variance (ANOVA) adopted by Tukey\u2019s multiple-comparison check, with p\u2009<\u20090.05 thought of statistically vital.<\/p>\n<\/div>\n
\n
Source link <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"Snail assortment and protein extraction The freshwater snails L. carinatus and B. unicolor investigated listed below are non-protected, decrease invertebrate species and had been collected from a freshwater locality at Lake Manzalah, Dakahlia Governorate, Egypt (31\u00b0\u00a011\u2032\u00a0N, 32\u00b0\u00a002\u2032\u00a0E). This examine was carried out on the Medical Malacology Division, Theodor Bilharz Analysis Institute, as a part of […]<\/p>\n","protected":false},"author":1,"featured_media":1882,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/media.springernature.com\/m685\/springer-static\/image\/art%3A10.1038%2Fs41598-026-60044-5\/MediaObjects\/41598_2026_60044_Fig1_HTML.png","fifu_image_alt":"","jnews-multi-image_gallery":[],"jnews_single_post":[],"jnews_primary_category":[],"jnews_override_bookmark_settings":[],"jnews_social_meta":[],"jnews_override_counter":[],"footnotes":""},"categories":[10],"tags":[2372,2371,2365,2367,2366,2368,2370,499,1440,2369,2364,2373],"class_list":["post-1880","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-biotechnology","tag-bellamya","tag-carinatus","tag-crude","tag-egyptian","tag-extracts","tag-freshwater","tag-lanistes","tag-potential","tag-protein","tag-snails","tag-therapeutic","tag-unicolor"],"yoast_head":"\n
Therapeutic potential of crude protein extracts from two Egyptian freshwater snails Lanistes carinatus and Bellamya unicolor - Future News 24<\/title>\n<meta name=\"description\" content=\"Freshwater snails are emerging sources of bioactive molecules with potential biomedical and therapeutic relevance. This study evaluated crude protein extracts from two Egyptian freshwater snails, Lanistes carinatus and Bellamya unicolor, for antioxidant enzymes, antimicrobial and antibiofilm activities, cytotoxicity against human cancer cell lines, and peptide composition. Both species exhibited low activities of superoxide dismutase (SOD), catalase (CAT), and glutathione S-transferase (GST), with slightly higher levels in L. carinatus. Despite this, the crude protein extracts inhibited the growth of Escherichia coli and Staphylococcus aureus; L. carinatus showed stronger antifungal activity against Candida albicans, while neither extract affected Aspergillus niger. Selective cytotoxicity was observed: L. carinatus was most active against MCF-7 and HeLa cells, whereas B. unicolor was highly potent against HCT-116 and moderately active against PC3 cells, with minimal effects on normal WI-38 cells. LC–MS\/MS identified 26 short peptides, likely contributing to the antimicrobial and anticancer activities.These findings provide preliminary evidence of the therapeutic potential of L. carinatus and B. unicolor crude protein extracts, highlighting freshwater snails as candidate sources of bioactive molecules that merit further investigation.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/futurenews24.com\/index.php\/2026\/07\/04\/s41598-026-60044-5\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Therapeutic potential of crude protein extracts from two Egyptian freshwater snails Lanistes carinatus and Bellamya unicolor - Future News 24\" \/>\n<meta property=\"og:description\" content=\"Freshwater snails are emerging sources of bioactive molecules with potential biomedical and therapeutic relevance. This study evaluated crude protein extracts from two Egyptian freshwater snails, Lanistes carinatus and Bellamya unicolor, for antioxidant enzymes, antimicrobial and antibiofilm activities, cytotoxicity against human cancer cell lines, and peptide composition. Both species exhibited low activities of superoxide dismutase (SOD), catalase (CAT), and glutathione S-transferase (GST), with slightly higher levels in L. carinatus. Despite this, the crude protein extracts inhibited the growth of Escherichia coli and Staphylococcus aureus; L. carinatus showed stronger antifungal activity against Candida albicans, while neither extract affected Aspergillus niger. Selective cytotoxicity was observed: L. carinatus was most active against MCF-7 and HeLa cells, whereas B. unicolor was highly potent against HCT-116 and moderately active against PC3 cells, with minimal effects on normal WI-38 cells. LC–MS\/MS identified 26 short peptides, likely contributing to the antimicrobial and anticancer activities.These findings provide preliminary evidence of the therapeutic potential of L. carinatus and B. unicolor crude protein extracts, highlighting freshwater snails as candidate sources of bioactive molecules that merit further investigation.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/futurenews24.com\/index.php\/2026\/07\/04\/s41598-026-60044-5\/\" \/>\n<meta property=\"og:site_name\" content=\"Future News 24\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-04T00:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-04T20:59:11+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/media.springernature.com\/m685\/springer-static\/image\/art%3A10.1038%2Fs41598-026-60044-5\/MediaObjects\/41598_2026_60044_Fig1_HTML.png\" \/>\n<meta name=\"author\" content=\"Future News 24\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/media.springernature.com\/m685\/springer-static\/image\/art%3A10.1038%2Fs41598-026-60044-5\/MediaObjects\/41598_2026_60044_Fig1_HTML.png\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Future News 24\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/futurenews24.com\\\/index.php\\\/2026\\\/07\\\/04\\\/s41598-026-60044-5\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/futurenews24.com\\\/index.php\\\/2026\\\/07\\\/04\\\/s41598-026-60044-5\\\/\"},\"author\":{\"name\":\"Future News 24\",\"@id\":\"https:\\\/\\\/futurenews24.com\\\/#\\\/schema\\\/person\\\/cecad1bde21cfc357cf70128144d6c83\"},\"headline\":\"Therapeutic potential of crude protein extracts from two Egyptian freshwater snails Lanistes carinatus and Bellamya unicolor\",\"datePublished\":\"2026-07-04T00:00:00+00:00\",\"dateModified\":\"2026-07-04T20:59:11+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/futurenews24.com\\\/index.php\\\/2026\\\/07\\\/04\\\/s41598-026-60044-5\\\/\"},\"wordCount\":1619,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/futurenews24.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/futurenews24.com\\\/index.php\\\/2026\\\/07\\\/04\\\/s41598-026-60044-5\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/media.springernature.com\\\/m685\\\/springer-static\\\/image\\\/art%3A10.1038%2Fs41598-026-60044-5\\\/MediaObjects\\\/41598_2026_60044_Fig1_HTML.png\",\"keywords\":[\"Bellamya\",\"carinatus\",\"crude\",\"Egyptian\",\"extracts\",\"freshwater\",\"Lanistes\",\"potential\",\"protein\",\"snails\",\"Therapeutic\",\"unicolor\"],\"articleSection\":[\"BioTechnology\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/futurenews24.com\\\/index.php\\\/2026\\\/07\\\/04\\\/s41598-026-60044-5\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/futurenews24.com\\\/index.php\\\/2026\\\/07\\\/04\\\/s41598-026-60044-5\\\/\",\"url\":\"https:\\\/\\\/futurenews24.com\\\/index.php\\\/2026\\\/07\\\/04\\\/s41598-026-60044-5\\\/\",\"name\":\"Therapeutic potential of crude protein extracts from two Egyptian freshwater snails Lanistes carinatus and Bellamya unicolor - Future News 24\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/futurenews24.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/futurenews24.com\\\/index.php\\\/2026\\\/07\\\/04\\\/s41598-026-60044-5\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/futurenews24.com\\\/index.php\\\/2026\\\/07\\\/04\\\/s41598-026-60044-5\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/media.springernature.com\\\/m685\\\/springer-static\\\/image\\\/art%3A10.1038%2Fs41598-026-60044-5\\\/MediaObjects\\\/41598_2026_60044_Fig1_HTML.png\",\"datePublished\":\"2026-07-04T00:00:00+00:00\",\"dateModified\":\"2026-07-04T20:59:11+00:00\",\"description\":\"Freshwater snails are emerging sources of bioactive molecules with potential biomedical and therapeutic relevance. 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This study evaluated crude protein extracts from two Egyptian freshwater snails, Lanistes carinatus and Bellamya unicolor, for antioxidant enzymes, antimicrobial and antibiofilm activities, cytotoxicity against human cancer cell lines, and peptide composition. Both species exhibited low activities of superoxide dismutase (SOD), catalase (CAT), and glutathione S-transferase (GST), with slightly higher levels in L. carinatus. Despite this, the crude protein extracts inhibited the growth of Escherichia coli and Staphylococcus aureus; L. carinatus showed stronger antifungal activity against Candida albicans, while neither extract affected Aspergillus niger. Selective cytotoxicity was observed: L. carinatus was most active against MCF-7 and HeLa cells, whereas B. unicolor was highly potent against HCT-116 and moderately active against PC3 cells, with minimal effects on normal WI-38 cells. LC–MS\/MS identified 26 short peptides, likely contributing to the antimicrobial and anticancer activities.These findings provide preliminary evidence of the therapeutic potential of L. carinatus and B. unicolor crude protein extracts, highlighting freshwater snails as candidate sources of bioactive molecules that merit further investigation.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/futurenews24.com\/index.php\/2026\/07\/04\/s41598-026-60044-5\/","og_locale":"en_US","og_type":"article","og_title":"Therapeutic potential of crude protein extracts from two Egyptian freshwater snails Lanistes carinatus and Bellamya unicolor - Future News 24","og_description":"Freshwater snails are emerging sources of bioactive molecules with potential biomedical and therapeutic relevance. This study evaluated crude protein extracts from two Egyptian freshwater snails, Lanistes carinatus and Bellamya unicolor, for antioxidant enzymes, antimicrobial and antibiofilm activities, cytotoxicity against human cancer cell lines, and peptide composition. Both species exhibited low activities of superoxide dismutase (SOD), catalase (CAT), and glutathione S-transferase (GST), with slightly higher levels in L. carinatus. Despite this, the crude protein extracts inhibited the growth of Escherichia coli and Staphylococcus aureus; L. carinatus showed stronger antifungal activity against Candida albicans, while neither extract affected Aspergillus niger. Selective cytotoxicity was observed: L. carinatus was most active against MCF-7 and HeLa cells, whereas B. unicolor was highly potent against HCT-116 and moderately active against PC3 cells, with minimal effects on normal WI-38 cells. 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This study evaluated crude protein extracts from two Egyptian freshwater snails, Lanistes carinatus and Bellamya unicolor, for antioxidant enzymes, antimicrobial and antibiofilm activities, cytotoxicity against human cancer cell lines, and peptide composition. Both species exhibited low activities of superoxide dismutase (SOD), catalase (CAT), and glutathione S-transferase (GST), with slightly higher levels in L. carinatus. Despite this, the crude protein extracts inhibited the growth of Escherichia coli and Staphylococcus aureus; L. carinatus showed stronger antifungal activity against Candida albicans, while neither extract affected Aspergillus niger. Selective cytotoxicity was observed: L. carinatus was most active against MCF-7 and HeLa cells, whereas B. unicolor was highly potent against HCT-116 and moderately active against PC3 cells, with minimal effects on normal WI-38 cells. 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