ADCY8 regulatory mechanism investigation

PRIMARY OUTCOME

elucidation of ADCY8 regulatory mechanism in migration

EXPECTED OUTCOMES

## Primary Outcomes **ADCY8 Expression Pattern**: Falcon ADCY8 highly expressed in hippocampus (≥3-fold vs. other brain regions). Expression increases during development (E10 to post-hatch: +2.5-fold), consistent with role in memory consolidation. **Functional Activity**: Forskolin stimulates cAMP production in falcon neurons (+180 ± 40% over baseline, n=4). Calcium ionophore produces +65 ± 20% increase, confirming ADCY8 contributes to calcium-stimulated cAMP production characteristic of the enzyme. ## Secondary Outcomes **G-protein Coupling**: Falcon ADCY8 shows both Gαs-mediated (forskolin response) and Gαi inhibition (pertussis toxin reduces forskolin response by ~30%), indicating complex regulation typical of ADCY8. **Behavioral Modulation**: KH7 inhibition of ADCY8 impairs target discrimination learning (20-30% reduction in success rate post-injection), while forskolin enhances it (15-20% improvement), supporting ADCY8's role in falcon cognition.

SUCCESS CRITERIA

## Primary Success Criteria **Molecular Identification**: Falcon ADCY8 must encode a functional adenylyl cyclase (cAMP production in transfected cells above vector control ≥2-fold) with intact catalytic domains (conserved motifs C and D, D =[S/T]xK, 6 catalytic residues). **Expression Specificity**: ADCY8 mRNA must show ≥2-fold enrichment in falcon hippocampus vs. non-hippocampal brain regions (qRT-PCR, n≥3 birds, p < 0.01). ## Secondary Success Criteria **Functional Confirmation**: ADCY8 activity (forskolin-stimulated cAMP) must be inhibited by KH7 (≥50% inhibition at 10 μM) with IC50 in reported range (5-15 μM), confirming enzyme identity. **Behavioral Relevance**: Any impairment in learning/performance with KH7 must be reversible (recovery within 72h) and specific (no effect on general motivation or motor function via independent behavioral controls).

PROTOCOL

# ADCY8 Regulatory Mechanism Investigation in Peregrine Falcon Neurons Protocol ## Phase 1: Falcon Neuron Culture Establishment (Days 1-21) **Tissue Collection**: Obtain post-mortem brain tissue from healthy adult peregrine falcons (Falco peregrinus, n=6, sexes pooled) within 3 hours of death (自然死亡或动物园医疗淘汰). Dissect hippocampal formation (medial hippocampus, V向他们) and whole brain. **Primary Neuron Culture**: Dissociate neurons from falcon hippocampus using papain digestion (20 U/mL, 37°C, 30 min). Plate neurons on poly-D-lysine/laminin-coated surfaces (100,000 cells/cm²). Culture in Neurobasal-A + B-27 supplement + 0.5 mM L-glutamine. Maintain at 38°C (bird body temperature), 5% CO₂. **Characterization**: At DIV 7, verify neuronal identity via anti-NeuN (1:200, Millipore #MAB377) immunostaining. Confirm ≥85% neurons, ≤5% GFAP+ astrocytes. Test for axonal marker Tau-1 (1:200, Abcam #ab10505). Establish culture purity. ## Phase 2: ADCY8 Expression and Functional Analysis (Days 22-49) **ADCY8 Cloning and Expression**: Design degenerate primers based on conserved adenylyl cyclase catalytic domains (motifs C and D). Amplify from falcon brain cDNA. Clone into pCMV-3xFLAG vector. Sequence full-length ADCY8 (falcon-specific). Align with human/mouse orthologs. **qRT-PCR Expression Analysis**: Assay ADCY8 mRNA across brain regions (hippocampus, optic tectum, cerebrum) and during development (E10, E14, post-hatch). Use β-actin as endogenous control. Calculate relative expression via ΔΔCt. **Adenylyl Cyclase Activity Assay**: Measure cAMP production in intact neurons via live-cell cAMP FRET sensor (Epac1-camps) or ELISA on cell lysates. Stimulate with forskolin (10 μM, 30 min), isoproterenol (1 μM, 30 min), or calcium ionophore (A23187, 1 μM). Compare responses between falcon neurons and mouse cortical neuron controls. ## Phase 3: Signaling Pathway and Behavioral Relevance (Days 50-70) **G-protein Coupling**: Test ADCY8 regulation by Gαs (forskolin-independent) vs. Gαi (inhibition of forskolin response) using specific activators/inhibitors: CTAP (Gαs activator), pertussis toxin (Gαi inhibitor, 100 ng/mL, 18h pretreatment). **Calcium Regulation**: Since ADCY8 is calcium-stimulated, test calcium dependence of cAMP production (EGTA buffer, calcium-free conditions vs. 1 mM extracellular Ca²⁺). Compare with previously characterized calcium-stimulated AC isoforms (ADCY1, ADCY3). **Learning Paradigm (Falcon-specific)**: For intact animal studies, train falcons on a target discrimination task (colored beads, 2-week training). Measure success rate before and after administration of ADCY8 inhibitor (KH7, 10 mg/kg, i.p.) or activator (forskolin, 0.5 mg/kg). This links ADCY8 to cognitive function.

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