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Gerardo Moscatelli: The Spike Protein Cascade – From Endothelial Binding to Vascular Collapse

Gerardo Moscatelli/LinkedIn

Jul 29, 2026, 16:01

Gerardo Moscatelli: The Spike Protein Cascade – From Endothelial Binding to Vascular Collapse

Gerardo Moscatelli, Global Grains, Oilseeds and Meals Brokerage, shared a post on LinkedIn:

“The Spike Protein Cascade: From Endothelial Binding to Vascular Collapse

Molecular biology of what’s happening inside millions of blood vessels right now.

Step 1: Spike coats the artery walls.

The SARS-CoV-2 Spike S1 subunit contains a furin cleavage that acts like molecular velcro for the endothelial surface. Once docked, it downregulates ACE2, damages mitochondria, disrupts VE-cadherin junctions between endothelial cells.

This is the initiating wound.

Step 2: Fibrinogen-to-fibrin conversion activates, then goes off the rails.

Tissue factor leads to thrombin burst leads to fibrinopeptides cleaved to fibrin monomers ready to polymerize. Normally this produces an orderly mesh that plasmin later dissolves.

Not here.

Host proteases cleave Spike into fragments that expose prion-like amyloidogenic motifs. These fragments act as nucleation seeds for fibrinogen. They template an α-helix to β-sheet conformational transformation.

Hydrophobic side chains stack into steric zippers, the identical cross-β structure found in Alzheimer’s plaques and prion rods.

Step 3: Amyloid fibrin microclots form and they’re indestructible.

They’re hyper-condensed, β-sheet-rich, Thioflavin T-positive, amyloids. Plasmin cannot digest them because cleavage sites are buried in the hydrophobic core.

They resist fibrinolysis completely.

Step 4: NETosis amplifies the catastrophe.

Spike directly triggers neutrophil extracellular trap formation, NETs become entangled with the amyloid fibrin.

Step 5: White fibrous casts line the vascular system.

Amyloid-NET microclots adhere to and coat the endothelial surface diffusely. This is not atherosclerosis. It’s a distinct amyloid angiopathy.

Step 6: Hemodynamics collapse.

Poiseuille’s Law: flow is proportional to r⁴. A 20% radius reduction means around 60% less flow. Every organ suffers hypoperfusion.

Chronic energy failure.

Step 7: The heart fights a losing battle.

Massively increased systemic vascular resistance. High afterload. Resting tachycardia. But coronary arteries are lined with the same casts.

The heart demands more oxygen while receiving less. Myocardium remodels: fibrosis replaces functional muscle.

Step 8: Terminal event.

At any point: coronary thrombosis, cerebral thrombosis, stroke.

Or ventricular free wall rupture. Cardiac tamponade.

Irreversible: β-sheet amyloid is at thermodynamic free energy minimum. It will not revert. Plasmin cannot access cleavage sites. Casts are acellular and avascular, no clearance mechanism exists.

Key papers:

Grobbelaar et al. (2021) — Isolated Spike S1 plus healthy fibrinogen to amyloid microclots. EM images show the transformation from normal fibrin mesh to dense anomalous deposits.
Nyström and Hammarström (2022) — S1 domain contains multiple amyloidogenic sequences. Forms bona fide amyloid fibrils in vitro.
Pretorius et al. (2020, 2021) — Amyloid microclots identified in patient plasma. ThT-positive. Protease-resistant.
Veras et al. (2020) — Spike directly triggers NETosis via TLR4.”

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