Polysaccharide of Black cumin (Nigella sativa) modulates molecular signaling cascade of gastric ulcer pathogenesis.
Gastric ulcer is a multi-step disease and healing requires a complex process including repair and re-architecture of gastric mucosa with the involvement of molecular events. Current study was designed to understand the gastric ulcer healing mechanism of rhamnogalacturonan-I type pectic polysaccharide of black cumin (BCPP) utilizing acetic acid induced gastric ulcers in rats. BCPP fed groups at 200mg/kg b.w. for 10days showed up to 85% healing of gastric ulcers with modulation of key molecular events involved in ulcer healing process such as increase in gastric mucin content, cyclooxygenase-2 (Cox-2) and prostaglandin E2(PGE2). The increase in extracellular signal-regulated kinase-2 (ERK-2) indicated that, BCPP could induce PGE-2 synthesis by increasing ERK-2 mediated COX-2 activity. Increase in matrix metalloproteinase-2 (MMP-2) and decrease in MMP-9 levels in BCPP treated groups indicated differential regulation of MMP-2 and 9, an essential event required for gastric mucosal re-modulation. BCPP containing bound phenolics (26mg/g) might have also played a role in increasing speed and quality of ulcer healing by inhibiting H+, K+-ATPase and decreasing free radical mediated oxidation and cellular damages. Overall, studies showed that the polysaccharide can mediate ulcer healing by modulating signaling pathways involved in either ulcer aggravation or healing process.
Department of Biochemistry, Central Food Technological Research Institute (CFTRI), CSIR Laboratory, Mysuru, 570 020, Karnataka, India. Electronic address: bmsrikanta@gmail.com.
Srikanta Belagihalli
SB
Manjegowda
Department of Biochemistry, Central Food Technological Research Institute (CFTRI), CSIR Laboratory, Mysuru, 570 020, Karnataka, India.
Harsha Mysore
HM
Rajagopal
Department of Biochemistry, Central Food Technological Research Institute (CFTRI), CSIR Laboratory, Mysuru, 570 020, Karnataka, India. Electronic address: cancerbiolab@gmail.com.
Shylaja Mallaiah
SM
Dharmesh
D000818:Animals; D002240:Carbohydrate Sequence; D051546:Cyclooxygenase 2 / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D037502:Galectin 3 / Q000378:metabolism; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D009077:Mucins / Q000096:biosynthesis; D031881:Nigella sativa / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D051381:Rats; D017208:Rats, Wistar; D013276:Stomach Ulcer / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology*
D037502:Galectin 3; D009077:Mucins; D011134:Polysaccharides; D051546:Cyclooxygenase 2; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9
Black cumin; Gastric ulcer; Pectic polysaccharide