Ultrastructural study of the lacrimal glands in severe dry eye disease following Stevens-Johnson syndrome

Abstract

PurposeThis study aimed to examine the ultrastructural features of the lacrimal glands of patients with severe dry eye due to Stevens-Johnson syndrome (SJS). MethodsBiopsies form orbital lobes of six lacrimal glands obtained from fresh body donors (n=3) and patients with SJS (n=3; absolute tear deficiency; 2-6 months of disease duration) were examined using transmission electron microscopy (TEM). ResultsOn TEM, normal lacrimal glandular tissue shows columnar acinar epithelial cells containing basally located rounded or oval euchromatic nuclei with cytoplasmic electron dense and ­moderately electron-dense secretory granules. Histologically, the lacrimal gland biopsies showed varied degree of acinar atrophy with lymphocytic infiltration in SJS patients. While on TEM, the lacrimal glands in SJS patients showed homogenous appearance of the nuclear chromatin of acinar cells with no differentiation into hetero-or euchromatin and loss of nucleoli. The cytoplasm lacked any electron dense material and showed significant loss of endoplasmic reticulum, mitochondria and Golgi bodies. The myoepithelial cells shared similar characteristics as in acinar epithelial cells along with loss of spindle shaped processes. ConclusionTransmission electron microscopy revealed ultrastructural changes in terms of nuclear composition, secretory vesicles, lysosomal vacuolation and myoepithelial cell distribution in the lacrimal glands of SJS patients.