interstitial lung disease -associations with autoantibodies dr felix woodhead locum respiratory...
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Interstitial Lung Disease-associations with autoantibodiesDr Felix WoodheadLocum Respiratory Physician UHCW5 October 2010
History of Fibrosing Alveolitis
• Corrigan 1838: “on cirrhosis of the lung”
• Hamman-Rich syndrome 1935
• Scadding 1964 – Fibrosing alveolitis
• Idiopathic pulmonary fibrosis in USA
• Averrill Liebow – pathology 1950s
Associations of ILD
• Inorganic dusts (pneumoconiosis)
• Organic dusts (Hypersensitivity Pneumonitis)
• Drugs
• Rheumatological disease
• Idiopathic
Cryptogenic Fibrosing Alveolitis
• Bibasal Crackles
• Restrictive Spirometry or isolated low TLco
• Basally-predominant fibrosis on CXR
• Absence of pneumoconiosis, EAA or known connective tissue disease– RA, SLE
– SSc, PM/DM
Patient 1
Patient 1 – Histopathology UIP
Patient 1 –Idiopathic Pulmonary Fibrosis (IPF)• Not interchangeable term for Idiopathic Interstitial Pneumonia
• ?most common IIP
• Relatively poor prognosis
• Median survival 2 ½ years
• Histology
– Usual Interstitial Pneumonitis (UIP) when biopsied
– Temporal and Spatial heterogeneity, not uniform
• Radiology
– Typical features: basal, peripheral honeycombing, little ground glass
– May have any appearance
– Typical features – don’t need to biopsy, atypical – biopsy helpful
Patient 2
Patient 1
Patient 2 – Respiratory Bronchiolitis
Smoking-related IIP• Respiratory Bronchiolitis
– Histological appearance in ‘healthy smokers’
– Pigmented macrophages in terminal bronchioles
– Clinical condition RB associated ILD (RBILD)
– RBILD radiology similar to Hypersensitivity Pneumonitis (EAA)
– BAL not lymphocytic
• DIP– ‘Desquamative’ due to erroneous belief cells shed into alveoli
– Diffuse collection of pigmented macrophages throughout alveoli
– Radiologically typified by diffuse GGO
• ?smoking related NSIP, Fibrosis and emphysema
The _IPs: Interstitial Pneumonias
• UIP – Usual, the most common, IPF
• NSIP – non-specific
• AIP – acute, Hamman-Rich, ARDS
• DIP – desquamative, ↑macrophages, smoking (RBILD – respiratory bronchiolitis – associated ILD)
• LIP – lymphocytic, HIV and connective tissue disease
2002 ATS/ERS guidelines for Idiopathic Interstitial Pneumonia
Am J Respir Crit Care Med 2002 Nicholson et al Am J Respir Crit Care Med 2000
Patient 3
Cryptogenic Fibrosing Alveolitis
• Bibasal Crackles
• Restrictive Spirometry or isolated low TLco
• Basally-predominant fibrosis on CXR
• Absence of pneumoconiosis, EAA or known connective tissue disease– RA, SLE
– SSc, PM/DM
Systemic Sclerosis
• Scleroderma – skin thickening above MCPs
• Sclerodactyly – skin thickening of fingers
• Digital pitting scars
• Bibasal pulmonary fibrosis
• Major criterion or two or more minor criteria
• Limited cutaneous (lcSSc) vs diffuse cutaneous (dcSSc)
• lcSSc ‘CREST’ syndrome
Interstitial Pneumonia in Systemic Sclerosis
• >50% patients ↓(TLco) in early studies
– Manoussakis et al. Chest 1987
– Steen et al. Arthritis Rheum 1985
• Since Rx for renal crisis, lung disease leading cause of death
– Ferri et al Medicine (Baltimore) 2002
– Scussel-Lonzetti et al Medicine (Baltimore) 2002
– Simeon et al Rheumatology.(Oxford) 2003
• More common in dcSSc
• FA-SSc thought to be indistinguishable from CFA
– Harrison et al. Am Rev Resp Dis 1991
• SSc ILD has a better prognosis than CFA
– Wells et al. AJRCCM 1994
Am J Respir Crit Care Med 2008
Autoantibodies – Antinuclear Antibodies
Centromeric Homogeneous Nucleolar• Diversity of antinuclear antibodies in progressive systemic sclerosis. Anti-centromere
antibody and its relationship to CREST syndrome
– Tan et al. Arthritis Rheum 1980
• 95% SSc Ho & Reveille Arthritis Research & Therapy 2003
• Auto antibodies– Anticentromere
– Anti-topoisomerase 1 (Scl-70)
– Anti RNA polymerase I & III
Anticentromere Antibodies
• Associated with CREST – Tan et al Arthritis Rheum 1980
– Riboldi et al Clinical and Experimental Rheumatology 1985
• Less likely than ACA neg to have pulmonary fibrosis– Steen et al Arthritis Rheum 1988
– Kane et al Respiratory Medicine 1996
• Defined by IIF pattern
• Antigen not soluble
• 6 defined antigens
• ELISA available but not widely used
Anti-topoisomerase 1 antibodies
• 2/3 ATA dcSSc– Steen et al Arthritis Rheum 1988
• Associated with pulmonary fibrosis– Cassani et al Clin Exp Rheumatol 1987
– Manoussakis et al Chest 1987
– Steen et al Arthritis Rheum 1988
Antibody characterisation
• IIF pattern Anticentromere (ACA)
• ENA Anti-topoisomerase 1(ATA)– Double immunodiffusion (Ouchterlony)
– Counterimmunoelectrophoresis (CIE)
• ELISA Anti-RNA polymerase I&III (ARA)
• Immunoblot
• Radiolabelled protein / RNA immunoprecipitation Th/To,others
Immunoblotting Immunoprecipitation
Cell lysate (radiolabelled) Cell lysate
SDS protein acrylamide gel electrophoresis
Separated denatured proteins
Precipitation of soluble antigens by
patient serum
Probing of denatured antigens by patient
serum
Precipitated native proteins
SDS protein acrylamide gel electrophoresis
Detection of antibodies with anti-human antibodies
Detection of antigens by autoradiography
Radiolabelled protein immunoprecipitation patterns
RNA immunoprecipitation
Autoantibodies in Systemic Sclerosis
• Anti-centromere: lcSSc and pulmonary hypertension
• Anti-topoisomerase 1: dcSSc and interstitial pneumonia
• Anti-RNA polymerase I & III: dcSSc, renal crisis, ‘watermelon stomach’
• Anti-PMScl: scleroderma/polymyositis overlap
• Th/To: ‘scleroderma sine scleroderma’
• Anti-U3 RNP: dcSSc, African American ethnicity
• Other SSc-associated AAs: U1-RNP, Ro, La etc
Polymyositis/Dermatomyositis
• Symmetrical proximal muscle weakness
• Elevated serum muscle enzymes
• EMG changes
• Abnormal muscle biopsy
• ± skin rash (Heliotrope rash, Gottron rash)
• 4 criteria ‘definite’, 3 ‘probable’, 2 ‘possible’
Autoantibodies in Idiopathic Inflammatory Myopathies – PM/DM
• Jo-1: histidyl tRNA synthetase– 6 other tRNA synthetase antibodies
– Anti-synthetase syndrome 20% IIM
– High incidence interstitial pneumonia,
– Arthritis, Raynaud’s, ‘mechanic’s hands’
• Mi-2: 5% IIM, predominantly DM, negative assoc IP
• Anti-Signal recognition particle: bad myopathy
• ‘Clinically amyopathic dermatomyositis’- CADM
Autoantibodies can predict likelihood of Intersitial Pneumonia in SSc
Median % 13 0 0 7
p<0.0001
ATA ARA ACA Other0
10
20
30
40
50
60
70
80
90E
xten
t (%
)
Are Autoantibodies useful in Idiopathic Disease?
• Useful in phenotyping connective tissue disease
• ANAs occur in 37% ‘CFA’ (Turner-Warwick)
• 22% my studied patients
• CTD – associated AAs found in IPF cohorts
• CTD-like symptoms common in idiopathic patients, biopsies NSIP > UIP
Is it important?
• CTD-associated ILD has better outcome
• Immunosuppressants
• ?Lesson from rheumatologists about ‘early synovitis’
Coventry and Warwickshire ILD service
• Established by David Parr/Christine O’Brien
• Monthly multidisciplinary meeting
• Thoracic surgeon present
• Future developments– Bronchoalveolar lavage
– Antinuclear antibody testing
– Research/Trials
– Specialist nurse
Questions?