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The human body is constantly encountered certain pathogens and the interaction between a pathogen and the human body will evoke an immune response.
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And this immune response can be categorized into two types.
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One is the innate immunity and other one is the adaptive immunity.
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The innate immunity is the natural immunity and it is non -specific in nature whereas the adaptive immunity, is a specific in nature and it depends on the type of that particular pathogen.
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So these pathogen will have certain molecules on your surfaces.
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These molecules are referred as the pathogen -associated molecular patterns written as pamsa.
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And the examples of pams include lipopolysaccharide, which is present in the case of gram -negative bacteria, peptidoglycan, it will be present.
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In the case of gram positive bacteria.
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Here, lipopolysacred is written as lps.
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Next to it is the flagella and the pillin.
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It is seen in case of certain bacteria that is used for their locomotion.
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And in the case, certain pathogens also includes double -stranded ribonucleic acid written as des rna that is seen in rioviruses and single -stranded, deoxyribonucic acid written as sst dna which is seen in barboviruses.
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So consider this to be an eukaryotic cell which will have receptors on its surface and these receptor will be recognized by the pathogens.
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Consider this to be the lps of a gram -negative bacteria.
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It will be recognized by the post -cellar surface receptor and this will generate an intracellular response and it will activate the genes present in the nucleus of the cell and this is an example of the immune response seen in a host cell so this molecule that is the receptor molecule which is present in the host cell surface it is called as the patent recognition receptors written as prr and these are present in various types of immune cells such as the neutrophils dentritic cells macro phages that helps in recognizing the pamps which are present on those pathogens...