What question did this study set out to answer?

To compare the cellular signaling mechanisms, potency, and membrane kinetics of full-length recombinant INGAP versus its bioactive peptide derivative.

August 1, 2012AJP Endocrinology and Metabolism

Mechanisms of action of islet neogenesis-associated protein: comparison of the full-length recombinant protein and a bioactive peptide

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To compare the cellular signaling mechanisms, potency, and membrane kinetics of full-length recombinant INGAP versus its bioactive peptide derivative.
Cloned full-length recombinant INGAP (rINGAP) and evaluated its effects alongside INGAP peptide (INGAP-P) in proliferating RIN-m5F cells.
Assessed downstream pathway engagement (Ras/Raf/ERK, Src, and Akt), pertussis toxin sensitivity to test G protein-coupled receptor involvement, and internalization kinetics via fluorescent labeling.
Both rINGAP and INGAP-P induced pertussis toxin-sensitive ERK1/2 activation, but rINGAP was at least 100-fold more efficient on a molar basis.
Fluorescently labeled rINGAP clustered on the cell membrane, internalized slowly (≤5 hours), and activated Src, whereas INGAP-P did not cluster, internalized within minutes, and activated Akt.

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Implication

In vitro study reveals full-length INGAP is over 100-fold more potent than INGAP peptide in beta-cells, indicating distinct receptor dynamics.

Cite This Study

Petropavlovskaia et al. (2012) studied this question.

synapsesocial.com/papers/6a1bdd4127b545b111a9209b https://doi.org/10.1152/ajpendo.00670.2011

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Implication

In vitro study reveals full-length INGAP is over 100-fold more potent than INGAP peptide in beta-cells, indicating distinct receptor dynamics.

Mechanisms of action of islet neogenesis-associated protein: comparison of the full-length recombinant protein and a bioactive peptide

Key Points

Discussion

Implication

Cite This Study

Mechanisms of action of islet neogenesis-associated protein: comparison of the full-length recombinant protein and a bioactive peptide

Key Points

Discussion

Implication

Cite This Study

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