| Tibial dyschondroplasia(TD)is a metabolic disorder that impairs bony and cartilage processes.It is more common in broilers due to the consumption of Thiram,especially in the industrial and agriculture zones.Tibial cartilage does not only seem to develop ossification during its occurrence,but it causes lameness,mortality,and moral convictions in commercial poultry.Moreover,it has been characterized as an economically significant condition since it is causing carcass damage in processing industries.There are different biological pathways in TD that lead to a particular outcome or a change in the chondrocytes.These pathways urge cells to send and receive signals through a series of activations and deactivations of concerning mediators.The natural cell death process in chondrocytes is genetically predetermined and involves the destruction of cells in response to specific signals.However,if this common cell death mechanism fails,the effects might be disastrous.This entire mechanism is interconnected through various cellular inputs,including anti-apoptotic,proapoptotic,and executioner caspases that further modulates the other basic chondrogenic proteins(collagen and aggrecan),extra cellular metalloproteinases,and NLRP3 base inflammasome.In recent years,the NLRP3 base inflammasome has become a dilemma in the occurrence of many diseases.According to many research investigations,the inflammasome has been linked to various diseases caused by pesticides and environmental toxins.Its involvement in such conditions opens up new treatment approaches.Therefore,in the current research project,the molecular mechanisms of TD in concern to apoptosis and inflammasome-related cell death and their physiological consequences were investigated with the aim of highlighting non-apoptotic role of Chlorogenic acid(CGA)under the specific target e.g.,micro RNAs.CGA is considered to have a potential role in controlling the perception of apoptosis.It is present naturally in various fruits,herbs,and vegetables,and has been used in pharmacological trials for having significant anti-apoptotic and antiinflammatory properties.It may stimulate Bcl-2 expression and limit Bax activation during apoptosis,which ultimately decreases osteoblast apoptosis.Nevertheless,the actual part of CGA in chondrocytes affected by Thiram is yet to be identified for countering micro RNAs expression.The major biological actions such as proliferation,differentiation,metabolism,and apoptosis are influenced by miRNAs.As a result,alterations in miRNA expression may significantly impact both normal and abnormal cells.The miR-460 a is an essential micro RNA involved in many structural and metabolic cellular processes.It is correlated with inflammatory genes,including IL-1β,in broiler.The project aimed to find and analyse the expression profiles of miR-460 a and its association with previously mentioned pathways in chondrocytes.The flow cytometry,western blot,RT-q PCR,and immunofluorescence assays were used to explore the expression of target markers.The chondrocytes were extracted and digested at 5% CO2 and 37 °C for 12 hours.After digestion,the solution was refined and inoculated at 2×105 cells/m L rate.Meanwhile,when the cells adhered up to 80% of culture plate,it was then integrated by 0.25 percent trypsin-EDTA for 2 minutes in compliance to sub-culturing.The markers such as collagen(Col-II)and aggrecan in their extracellular matrix were confirmed through immunofluorescence for the conformation of chondrocytes.To induce cytotoxicity,a sublethal dosage of Thiram,i.e.,2.5 g/m L,was utilized,followed by an optimal dose of CGA(40 g/m L),confirmed through CCK8.Moreover,the predicted miR-460 a binding location in the 3’-UTR of Bcl-2 has indeed been verified.To build both psi-wild type Bcl-2 3’UTR and psi-mutant Bcl-2 3’UTR,Bcl-2 3’UTR amplification was constructed and putted both the wild type Bcl-2 3’UTR and the mutant Bcl-2 3’UTR into the psi-CHECKTM 2 vector.According to the findings,the luciferase activity of cells containing Bcl-2 wild type was significantly reduced(p > 0.00).However,the activity of cells with MUT 3′UTR was not entirely different(p < 0.03)in the cells with miR overexpression.Moreover,a significant rate of apoptosis(p < 0.05)was also seen in the miR-460 a over expressed groups,indicating that miR-460 a had an adverse effect on chondrocytes apoptosis.On the base of further exploration,the Bcl-2 suppression or overexpression of miR-460 a,was associated with apoptosis,mitochondrial malfunction,and NLRP3 base inflammasome activation.That further led to the production of IL-1β.Such dysfunction resulted in the activation of apoptotic executioners ’ caspases,Caspase-3,and Caspase-7 under the influence of Bax and Bak mediated drive of cytochrome C.While the expression level of CD147(Extra cellular metalloproteinase inducer)and chondrogenic basic proteins e.g.,collagen and aggrecan were also noticed to be suppressed in miR-460 a over expressed groups.Further we explored the efficacy of CGA at same signalling pathways.According to the results,CGA decreased the rate of apoptosis and enhanced the chondrocytes’ viability in both in vitro as well as in vivo experiments,accompanied by the activation of Bcl-2,that further led to regulating Caspase-3/Caspase-7.Conversely,upregulation of miR-460 a with upgrade cleavage of Caspase-3,Caspase-7 and downgrade of Bcl-2,indicated the activation of the NLRP3 base inflammasome in chondrocytes in TD model.Hence,the equilibrium of these proteins ensured appropriate governance of apoptosis during the evolution and continuity of chondrocytes with less ability to provoke pro-inflammatory signaling.So,the CGA has a negative effect on miR-460 a,setting off negative role on apoptotic and inflammasome pathways.Furthermore,these findings point out the involvement of CD147 and the Nod like receptor pyrin domain 3,which might be potential targets to eliminate TD and all other chondrocytes associated disorders e.g.,e.g.,osteoporosis and osteoarthritis at all stages of pathology. |
