Journal articles: 'Mudcrab'

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Poonon, Sheila C., and Hazel E. Soliven. "Supply Chain Improvement of Mud crab Industry in Northern Mindanao, Philippines." International Journal of Applied Science and Research 05, no. 04 (2022): 168–76. http://dx.doi.org/10.56293/ijasr.2022.5419.

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The study was conducted to assess the existing supply chain for mudcrab in Region 10 and to identify areas for improvement. The study covered major mudcrab producing areas in Region 10. Reconnaissance survey, courtesy calls and visits to the Local Government Units, Bureau of Fisheries and Aquatic Resources, and Department of Agriculture Offices in the mudcrab producing areas were done to identify the study sites. Results revealed that almost half (49.42%) of the mudcrab production in the country is from Region 10 which were majority caught/sourced from Panguil Bay. There are four specific supply chains traced. Computation of the marketing cost and margin for each key player revealed that the profit margin is higher towards downstream key players (traders). Also, the shorter the supply chain the more equitable distribution of income is observed. There is no face to face interaction between the local traders and the metro manila traders which resulted to information asymmetry. Some of the issues included mortality of mudcrabs during transport, price fluctuation, opportunistic behavior of the fisherman, and political intervention. Finally, common perception of the interviewed respondents pointed out that mudcrab supply is decreasing in Region 10. Therefore, the need for further intervention project on the production technology/ reinforcement of mudcrab industry should be done.

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Sunarto, Sulistiono, and Isdradjad Setyobudiandi. "HUBUNGAN JENIS KEPITING BAKAU (Scylla Spp.) DENGAN MANGROVE DAN SUBSTRAT DI TAMBAK SILVOFISHERY ERETAN, INDRAMAYU (Relationship of Mudcrab (Scylla Spp.) with Mangrove and Substrate in Silvofishery Ponds, Eretan, Indramayu)." Marine Fisheries : Journal of Marine Fisheries Technology and Management 6, no. 1 (September 30, 2016): 59. http://dx.doi.org/10.29244/jmf.6.1.59-68.

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ABSTRACT Mudcrab is one of the fishery commodity with high economic value in Indonesia. High market and price stimulated the development of the mudcrabs business in this country. The aim of this research was to evaluate interaction between habitat characteristics and the mudcrabs (Scylla spp.) species. The research was conducted in silvofishery ponds of Eretan village, Indramayu, West Java from September-November 2013 and August-September 2014. Sampling was conducted at five stations. They were BDR (Brackishwater dominated Rhizophora sp.), BDA (Brackishwater dominated Avicennia sp.), BCDR (Brackishwater cannal dominated Rhizopora sp.), BCDA (Brackishwater cannal dominated Avicennia sp.) and SMF (Side of the mangrove forest). The result showed there were two species of the mudcrabs Scylla paramamosain and Scylla olivacea. S. paramamosain was dominated than S. olivacea at all stations. Total number of the S. paramamosain was 107 ind (consisted of 67 male and 40 female), while total number of the S. olivacea was 28 ind (consisted of 17 male and 11 female). Composition of the mudcrabs species in each station was 91% S. paramamosain and 9% S. olivacea at BDR, 89% S. paramamosain and 11% S. olivacea at BDA, 86% S. paramamosain and 14% S. olivacea at BCDR, 68% S. paramamosain and 32% S. olivacea at BCDA, 73% S. paramamosain and 27% S. olivacea at SMF. Differences between kinds of mudcrab in each stations showed there are interaction between kinds of mudcrabs with habitat characteristics. Keywords: Indramayu, mangrove, mudcrabs, substrate,-------ABSTRAKKepiting bakau (Scylla spp.) merupakan salah satu komoditas perikanan di Indonesia yang bernilai ekonomis tinggi. Luasnya pemasaran dan tingginya nilai jual kepiting bakau membuat bisnis tersebut semakin berkembang. Penelitian ini bertujuan untuk mengetahui hubungan keberadaan jenis kepiting bakau dengan karakteristik habitatnya. Penelitian ini dilakukan dari Agustus-November 2013 dan Agustus-September 2014 pada kawasan tambak silvofishery Desa Eretan, Indramayu, Jawa Barat. Pengambilan sampel dilakukan pada lima stasiun pengamatan diantaranya TSDR (Tambak silvofishery dominan Rhizopora sp.), TSDA (Tambak silvofishery dominan Avicennia sp.), KDR (Kanal dominan Rhizopora sp.), KDA (Kanal dominan Avicennia sp.) dan PHM (Pinggiran hutan mangrove). Hasil penelitian ini menunjukkan bahwa terdapat dua jenis kepiting bakau yaitu Scylla paramamosain dan S. olivacea. Di lokasi penelitian jumlah Scylla paramamosain yang tertangkap sebanyak 107 individu yang terdiri dari 67 jantan dan 40 betina, sedangkan jumlah S. olivacea yang tertangkap sebanyak 28 individu yang terdiri atas 17 jantan dan 11 betina. Hasil penelitian menunjukkan pada umumnya jumlah S. paramamosain yang tertangkap melebihi S. olivacea. Persentase kepiting bakau yang tertangkap pada tiap stasiun pengamatan yaitu 91% S. paramamosain dan 9% S. olivacea pada TSDR, 89% S. paramamosain dan 11% S. olivacea pada TSDA, 86% S. paramamosain dan 14% S. olivacea pada KDR, 68% S. paramamosain dan 32% S. olivacea pada KDA, 73% S. paramamosain dan 27% S. olivacea pada PHM. Perbedaan jumlah jenis kepiting bakau yang diperoleh pada tiap stasiun penangkapan menunjukan bahwa terdapat hubungan antara jenis kepiting bakau dengan habitat hidupnya. Kata kunci: Indramayu, mangrove, kepiting bakau, substrat,

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Nurussalam, Wildan, Kukuh Nirmala, Eddy Supriyono, and Yuni Puji Hastuti. "The frequency of calcium and magnesium differences in recirculation systems for increasing production of mudcrab Scylla serrata seed." Jurnal Akuakultur Indonesia 16, no. 2 (July 1, 2017): 144. http://dx.doi.org/10.19027/jai.16.2.144-153.

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ABSTRACTMolting phase is one of many factors that can inhibit mudcrab growth. Recirculation system in culturing mudcrab has a weakness which is the decreasing of ions. Calcium and magnesium in the water can affect the molting phase. The aim of this study was to evaluate the best additional frequency of calcium and magnesium in recirculation system. This research used mudcrab seeds that have weight of 54.856±2.195 gram. This research used completely randomized design with four treatments and three replicates. The treatments were additional frequency of Ca and Mg, comprised of four levels, without additional Ca and Mg (A), additional 30 mg/L Ca and 30 mg/L Mg in every five days (B), additional 30 mg/L Ca, and 30 mg/L Mg in every 10 days (C), and additional 30 mg/L Ca and 30 mg/L Mg in every 15 days (D). The result showed that total of biomass in every treatments were A (379.99±86.16 gram), B (517.65±103.94 gram), C (808.68±59.29 gram), and D (1,054.41±73.54 gram). The highest final biomass was the D treatment (1,054,41±73.54), which was significantly different to others (P<0.05).Keywords: mudcrab, resirculation, calcium, magnesium, molting, production ABSTRAKSalah satu faktor penghambat pertumbuhan kepiting bakau adalah fase molting. Sistem resirkulasi budidaya kepiting bakau memiliki kelemahan yaitu berkurangnya ion-ion. Fase moting pada kepiting bakau sangat dipengaruhi oleh keberadaan ion kalsium dan magnesium dalam air. Penelitian ini bertujuan untuk menentukan frekuensi waktu penambahan kalsium dan magnesium terbaik dalam sistem resirkulasi. Penelitian ini menggunakan benih kepiting bakau dengan berat rata-rata 54,856±2,195 gram. Penelitian ini menggunakan rancangan acak lengkap (RAL) dengan empat perlakuan dan tiga ulangan. Perlakuan penambahan Ca dan Mg sebanyak 30 mg/L terdiri atas empat macam frekuensi, yaitu tanpa penambahan Ca dan Mg (A), frekuensi lima hari sekali (B), frekuensi 10 hari sekali (C), dan frekuensi 15 hari sekali (D). Hasil penelitian menunjukkan jumlah biomassa masing-masing perlakuan adalah A (379,99±86,16 gram), B (517,65±103,94 gram), C (808,68±59,29 gram), dan D (1.054,41±73,54 gram). Perlakuan terbaik diperoleh pada perlakuan D dengan jumlah biomassa sebesar (1.054,41±73,54 gram) ini berbeda nyata (P<0,05) dengan perlakuan lainnya. Kata kunci: kepiting bakau, resirkulasi, kalsium, magnesium, molting, produksi

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Nurussalam, Wildan, Kukuh Nirmala, Eddy Supriyono, and Yuni Puji Hastuti. "The frequency of calcium and magnesium differences in recirculation systems for increasing production of mudcrab Scylla serrata seed." Jurnal Akuakultur Indonesia 16, no. 2 (July 1, 2017): 155. http://dx.doi.org/10.19027/jai.16.2.155-164.

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ABSTRACTMolting phase is one of many factors that can inhibit mudcrab growth. Recirculation system in culturing mudcrab has a weakness which is the decreasing of ions. Calcium and magnesium in the water can affect the molting phase. The aim of this study was to evaluate the best additional frequency of calcium and magnesium in recirculation system. This research used mudcrab seeds that have weight of 54.856±2.195 gram. This research used completely randomized design with four treatments and three replicates. The treatments were additional frequency of Ca and Mg, comprised of four levels, without additional Ca and Mg (A), additional 30 mg/L Ca and 30 mg/L Mg in every five days (B), additional 30 mg/L Ca, and 30 mg/L Mg in every 10 days (C), and additional 30 mg/L Ca and 30 mg/L Mg in every 15 days (D). The result showed that total of biomass in every treatments were A (379.99±86.16 gram), B (517.65±103.94 gram), C (808.68±59.29 gram), and D (1,054.41±73.54 gram). The highest final biomass was the D treatment (1,054,41±73.54), which was significantly different to others (P<0.05).Keywords: mudcrab, resirculation, calcium, magnesium, molting, productionABSTRAKSalah satu faktor penghambat pertumbuhan kepiting bakau adalah fase molting. Sistem resirkulasi budidaya kepiting bakau memiliki kelemahan yaitu berkurangnya ion-ion. Fase moting pada kepiting bakau sangat dipengaruhi oleh keberadaan ion kalsium dan magnesium dalam air. Penelitian ini bertujuan untuk menentukan frekuensi waktu penambahan kalsium dan magnesium terbaik dalam sistem resirkulasi. Penelitian ini menggunakan benih kepiting bakau dengan berat rata-rata 54,856±2,195 gram. Penelitian ini menggunakan rancangan acak lengkap (RAL) dengan empat perlakuan dan tiga ulangan. Perlakuan penambahan Ca dan Mg sebanyak 30 mg/L terdiri atas empat macam frekuensi, yaitu tanpa penambahan Ca dan Mg (A), frekuensi lima hari sekali (B), frekuensi 10 hari sekali (C), dan frekuensi 15 hari sekali (D). Hasil penelitian menunjukkan jumlah biomassa masing-masing perlakuan adalah A (379,99±86,16 gram), B (517,65±103,94 gram), C (808,68±59,29 gram), dan D (1.054,41±73,54 gram). Perlakuan terbaik diperoleh pada perlakuan D dengan jumlah biomassa sebesar (1.054,41±73,54 gram) ini berbeda nyata (P<0,05) dengan perlakuan lainnya. Kata kunci: kepiting bakau, resirkulasi, kalsium, magnesium, molting, produksi

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5

Syafaat, Muhammad Nur, and Gunarto Gunarto. "BUDIDAYA PEMBESARAN KEPITING BAKAU Scylla tranquebarica (Fabricius, 1798) HASIL PEMBENIHAN PADA LOKASI TAMBAK YANG BERBEDA." Media Akuakultur 13, no. 1 (August 10, 2018): 21. http://dx.doi.org/10.15578/ma.13.1.2018.21-30.

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Kegiatan pembesaran kepiting bakau hasil pembenihan di tambak masih terbatas dan pada umumnya masih merupakan kegiatan penelitian. Tujuan penelitian ini adalah untuk mengetahui pertumbuhan, sintasan, produksi, dan membuat analisis usaha pembesaran krablet kepiting bakau hasil pembenihan pada beberapa lokasi tambak tradisional. Penelitian dilakukan di tiga lokasi tambak yaitu Maros, Pangkep, dan Polewali Mandar (Polman). Tambak yang digunakan pada setiap lokasi merupakan tambak tradisional berkonstruksi tanah dengan sistem penggantian air berdasarkan pasang surut. Krablet kepiting bakau dengan kisaran bobot 0,05-0,1 g/ekor ditebar dengan kepadatan 0,24 ekor/m2 dan 0,27 ekor/m2 untuk Kabupaten Pangkep dan Polman secara berurutan sedangkan pada Kabupaten Maros dengan kepadatan 0,53 ekor/m2. Jenis pakan yang diberikan yaitu ikan rucah atau ikan liar yang ada di sekitar lokasi tambak dengan dosis 5%-10% dari biomassa dan diberikan dua atau tiga hari sekali. Hasil penelitian menunjukkan bahwa pertumbuhan kepiting bakau di tiga lokasi pada bulan ketiga diperoleh bobot akhir rata-rata dengan kisaran 131,05-199,50 g/ekor (163,17 ± 34,42); sintasan 22%-36,94% (30,41 ± 7,65); dan produksi 79,25-272,12 kg/ha (176,07 ± 96,43). Keuntungan tertinggi diperoleh pada lokasi Maros yaitu Rp5.454.750,00/ha/siklus dan terendah di lokasi Polman yaitu Rp317.150,00/ha/siklus. Nilai R/C rasio untuk semua lokasi menunjukkan lebih besar dari satu yang berarti bahwa usaha pembesaran kepiting bakau di tambak menggunakan krablet asal hatchery merupakan usaha yang layak. Ketersediaan pakan yang cukup, keberadaan shelter, pergantian air secara rutin dan kondisi kualitas air yang optimal merupakan faktor penting yang perlu diperhatikan untuk meningkatkan produksi pada ketiga lokasi di samping meningkatkan kepadatan sampai 1 ekor/m2.The grow-out cultures of hatchery-produced mudcrab seed in pond are rare and mostly part of research activities. The purpose of this study was to determine the performance of growth, survival rate, production, and develop a business analysis of mudcrab (S. tranquebarica) grow-out culture in different pond locations using hatchery-reared seed. The study was conducted in three pond areas in Maros, Pangkep, and Polewali Mandar (Polman). The ponds used in each location were traditional soil ponds with sufficient tidal system for water exchange. Crablets with a weight range of 0.05-0.1 g were reared in the ponds located in Pangkep, Polman and Maros with stocking densities of 0.24, 0.27 and 0.53 ind./m2, respectively. The feed used was trash fish or locally caught wild fish and given 5%-10% of the total crab biomass once every two or three days. The results showed that the average final weight of mudcrab in the three locations during three months rearing period was 131.05-199.50 g/ind. (163.17 ± 34.42) with survival rates of 22%-36.94% (30.41 ± 7.65), and crab production of 79.25-272.12 kg/ha (176.07 ± 96.43). The highest profit was obtained by grow-out culture in Maros location (IDR 5,454,750/ha/cycle) followed by Pangkep location (IDR 4,624,400/ha/cycle) and the lowest at Polman location (IDR 317,150/ha/cycle). The R/C ratio for all locations was greater than one which means that mudcrab culture in pond using seed from hatchery is economically feasibility.

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Agbayani, Renato F., Dan D. Baliao, Giselle P. B. Samonte, Reuel E. Tumaliuan, and Romeo D. Caturao. "Economic feasibility analysis of the monoculture of mudcrab (Scylla serrata) Forsskal." Aquaculture 91, no. 3-4 (December 1990): 223–31. http://dx.doi.org/10.1016/0044-8486(90)90190-x.

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Suherman, Sutianto Pratama, Rahmatiya Marjan, and Arafik Lamadi. "Octolasmic Octolasmis spp. parasite attack on mudcrab Scylla serrata in Tomini Bay." Tomini Journal of Aquatic Science 3, no. 2 (November 14, 2022): 61–67. http://dx.doi.org/10.37905/tjas.v3i2.14179.

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The present study aimed to identify the Octolasmis spp. ectoparasite’s intensity and prevalence in mud crab in Pohuwato Regency. It employed survey and site observation methods with sampling technique of mud crabs in Pohuwato Regency. The research was carried out in three different sites: site 1 (Pohuwato Timur Village), site II (Bulili Village), and site III (Mootilango Village). The results showed that the parasites infesting mud crab in the three separate locations are Octolasmis angulata and Octolasmis cor. The highest intensity rate was at site III, which was dominated by Octolasmis cor. The prevalence of the parasite in sites I, II, and III was 60%, 40%, and 60% in consecutive order. Moreover, the parasite has a 100% and 46% prevalence in female and male crabs, respectively. The water quality indicator (involving temperature, pH level, and soluble oxygen) was at the appropriate rate for mud crab farming.

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Heasman, MP, DR Fielder, and RK Shepherd. "Mating and spawning in the mudcrab, Scylla serrata (Forskaål) (Decapoda: Portunidae), in Moreton Bay, Queensland." Marine and Freshwater Research 36, no. 6 (1985): 773. http://dx.doi.org/10.1071/mf9850773.

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Mating activity in a southern Queensland population of S. serrata was at a maximum level in mid-spring and late summer-early autumn. Spawning activity, as indicated by the incidence of spent females, began early in spring and ended in early autumn while water temperatures exceeded approximately 22�C. Nevertheless, ovary condition was apparently held constant during the colder non-spawning half of the year. Ovary condition was not correlated with either ovary coloui or crab size.

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Shyne Anand, Panantharayil Sudhayam, Changaramkumarth Paran Balasubramanian, Christina Lalramchhani, Akshaya Panigrahi, Chavali Gopal, Tapas Kumar Ghoshal, and Koyadan Kizhakedath Vijayan. "Comparison of mudcrab-based brackishwater polyculture systems with different finfish species combinations in Sundarban, India." Aquaculture Research 49, no. 9 (July 12, 2018): 2965–76. http://dx.doi.org/10.1111/are.13755.

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Saha, Sanjib, Mitali Ray, and Sajal Ray. "Behavioural shift of estuarine mudcrab as biomarker of arsenic exposure in Sundarbans estuary of West Bengal." Journal of Applied and Natural Science 2, no. 2 (December 1, 2010): 258–62. http://dx.doi.org/10.31018/jans.v2i2.131.

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Mudcrab Scylla serrata (Crustacea: Decapoda) in an ecologically and economically important species of Sundarbans Biosphere Reserve was studied for its behaviour under the exposure of toxic arsenic - a common xenobiotic of this area. The behavioural profile of aquatic animals exposed to diverse toxicants are considered as an index to estimate the degree and nature of stress experienced by the animals both in nature and in experimental conditions. Present investigation involved study of selected behavioural shift of S. serrata under the sublethalconcentrations of 1, 2 and 3 ppm of sodium arsenite for 1, 2, 3 and 4 days in controlled laboratory condition. Exposure to arsenic resulted an appearance of selected abnormal behavioural manifestation including tendency of avoidance, hypersecretion of mucoid element and release of excess excretory products. Toxin induced alteration of studied behaviour is indicative to possible shift in the overall physiological functions and biological activities of this important species in its natural habitat. Chronic exposure to 3 ppm of sodium arsenite for 30 days may lead to decline this economically important species in Sundarbans Biosphere Reserve.

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Gopurenko, D., J. M. Hughes, and C. P. Keenan. "Mitochondrial DNA evidence for rapid colonisation of the Indo-West Pacific by the mudcrab Scylla serrata." Marine Biology 134, no. 2 (July 7, 1999): 227–33. http://dx.doi.org/10.1007/s002270050541.

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Baticados, Didi B., Renato F. Agbayani, and Emilia T. Quinitio. "Community-Based Technology Transfer in Rural Aquaculture: The Case of Mudcrab Scylla serrata Nursery in Ponds in Northern Samar, Central Philippines." AMBIO 43, no. 8 (May 10, 2014): 1047–58. http://dx.doi.org/10.1007/s13280-014-0528-5.

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Karim, Muhammad Yusri, Hasni Y. Azis, and Muslimin Muslimin. "PERTUMBUHAN KEPITING BAKAU Scylla olivacea DENGAN RASIO JANTAN-BETINA BERBEDA YANG DIPELIHARA PADA KAWASAN MANGROVE." Jurnal Perikanan Universitas Gadjah Mada 18, no. 1 (March 20, 2016): 1. http://dx.doi.org/10.22146/jfs.12593.

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Mudcrab fattening is potential to develop in mangrove areas. The aim of the present study was to determine the best ratio of male and female in fattening of mud crab in the mangrove area. Research was conducted in the mangrove areas of Pangkep Regency, South Sulawesi Province. Test animals used were mud crab S. olivacea male and female measuring weight of 250 ± 10 g and were stocked at a density of 10 animals/cage. The bamboo cages measuring length, width, and height of 1.0 x 1.0 x 1.0 m3 were placed in the mangrove areas. Feed used was trash fish at 10% of the biomass with the feeding frequency of two times a day ie morning (30%) and afternoon (70%). The study used a completely randomized design (CRD) consisting of 4 treatments and 3 replications. The ratio of male and female crabs were 7:3; 6:4; 5:5; 4:6 and 3:7 crabs/cage, respectively. Results of analysis of variance showed that the treatment with the different ratio of male and female was not significant (p> 0.05) on the survival rate of crab, but was highly significant (p <0.01) on the absolute and daily growth rate. The resulting survival rate ranges from 93.33 to 100%, absolute growth and the highest daily growth rate of crabs produced at a ratio of males and females (7:3) and (6:4) crabs/cage ie: 56.99 and 1.35; 56.25 g and 1.36%/day, while the lowest was in the ratio (3:7) crabs/cage ie: 28.97 g and 0.73%/day.

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Matsubara, Hitoshi, Kosaburo Hirose, Taka-aki Edo, Kei-ichi Tamanaha, Hisao Hara, and Tomonori Yamada. "Numerical modelling of mudcrack growth." Japanese Geotechnical Society Special Publication 2, no. 31 (2016): 1143–47. http://dx.doi.org/10.3208/jgssp.atc1-3-17.

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Hirose, Kosaburo, and Hitoshi Matsubara. "Mechanisms of Mudcrack Formation and Growth in Bentonite Paste." Journal of Geotechnical and Geoenvironmental Engineering 144, no. 4 (April 2018): 04018017. http://dx.doi.org/10.1061/(asce)gt.1943-5606.0001853.

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Chowdhury, Abdullah Harun, and Md Ali Akber. "Study Of Impacts Of Oil Spill On The Sundarbans Mangrove Forest Of Bangladesh." Journal of the Asiatic Society of Bangladesh, Science 41, no. 1 (June 16, 2015): 75–94. http://dx.doi.org/10.3329/jasbs.v41i1.46193.

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Studies were carried out on the recent oil spill in the Sundarbans of Bangladesh to findout the immediate impacts on the ecosystem of the Sundarbans after oil spilling. Morethan 500 km2 areas out of the total study area have been affected seriously by the oil spillcontamination on 9 December 2014. Recorded data of the physico-chemical conditions,oil content, productivity, diversity and abundance of phyto-zooplankton and benthos ofwater, and oil content in soil indicate that the water and soil of the Eastern part of theSundarbans were polluted by the oil contamination. Results also indicate that seedlings,mangrove algae, eggs and hatchlings of commercially valuable fishes, mudskippers, mudcrabs, snails, monitor lizards were affected due to oil spill. Regeneration of the Sundritrees; intertidal zone bird - ‘Masked finfoot’, common birds, fishing cat, otter, dolphins,crocodile would be affected due to the oil spill. Long term monitoring, in depth researchand proper implementation of all rules and regulations are necessary to save the fragileecosystem of the Sundarbans-the UNESCO declared world heritage site. Asiat. Soc. Bangladesh, Sci. 41(1): 75-94, June 2015

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Ward, Joseph B. J., Natalia K. Lajczak, Orlaith B. Kelly, Aoife M. O’Dwyer, Ashwini K. Giddam, Joan Ní Gabhann, Placido Franco, et al. "Ursodeoxycholic acid and lithocholic acid exert anti-inflammatory actions in the colon." American Journal of Physiology-Gastrointestinal and Liver Physiology 312, no. 6 (June 1, 2017): G550—G558. http://dx.doi.org/10.1152/ajpgi.00256.2016.

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Inflammatory bowel diseases (IBD) comprise a group of common and debilitating chronic intestinal disorders for which currently available therapies are often unsatisfactory. The naturally occurring secondary bile acid, ursodeoxycholic acid (UDCA), has well-established anti-inflammatory and cytoprotective actions and may therefore be effective in treating IBD. We aimed to investigate regulation of colonic inflammatory responses by UDCA and to determine the potential impact of bacterial metabolism on its therapeutic actions. The anti-inflammatory efficacy of UDCA, a nonmetabolizable analog, 6α-methyl-UDCA (6-MUDCA), and its primary colonic metabolite lithocholic acid (LCA) was assessed in the murine dextran sodium sulfate (DSS) model of mucosal injury. The effects of bile acids on cytokine (TNF-α, IL-6, Il-1β, and IFN-γ) release from cultured colonic epithelial cells and mouse colonic tissue in vivo were investigated. Luminal bile acids were measured by gas chromatography-mass spectrometry. UDCA attenuated release of proinflammatory cytokines from colonic epithelial cells in vitro and was protective against the development of colonic inflammation in vivo. In contrast, although 6-MUDCA mimicked the effects of UDCA on epithelial cytokine release in vitro, it was ineffective in preventing inflammation in the DSS model. In UDCA-treated mice, LCA became the most common colonic bile acid. Finally, LCA treatment more potently inhibited epithelial cytokine release and protected against DSS-induced mucosal inflammation than did UDCA. These studies identify a new role for the primary metabolite of UDCA, LCA, in preventing colonic inflammation and suggest that microbial metabolism of UDCA is necessary for the full expression of its protective actions. NEW & NOTEWORTHY On the basis of its cytoprotective and anti-inflammatory actions, the secondary bile acid ursodeoxycholic acid (UDCA) has well-established uses in both traditional and Western medicine. We identify a new role for the primary metabolite of UDCA, lithocholic acid, as a potent inhibitor of intestinal inflammatory responses, and we present data to suggest that microbial metabolism of UDCA is necessary for the full expression of its protective effects against colonic inflammation.

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Journal articles on the topic 'Mudcrab'

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